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Environmental Chemistry Environmental Chemistry Society
Environmental problems - Chemical approaches
RESEARCH ARTICLE

Fabrication of magnetic functionalised calix[4]arene composite for highly efficient and selective adsorption towards uranium(VI)

Fang-Zhu Xiao A F H , Cheng Wang B H , Li-Mei Yu C , Yi-Qiu Pu D , Yu-Li Xu B , Kang Zhang E , Jia-Qi Luo B , Qi-Qi Zhu A , Fang Chen E , Yong Liu E F , Chun-Hsing Ho G , Guo-Wen Peng https://orcid.org/0000-0001-8094-8317 B E F I and Shu-Ya He A I
+ Author Affiliations
- Author Affiliations

A School of Public Health, University of South China, Hengyang 421001, China.

B School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China.

C School of Chemical Biology and Environmental Engineering, Xiangnan University, Chenzhou 423000, China.

D Plant Protection Station, Zhengan Agricultural and Pastoral Bureau, Zunyi 563400, China.

E School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China.

F Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment, University of South China, Hengyang 421001, China.

G Department of Civil Engineering, Construction Management, and Environmental Engineering, Northern Arizona University, 2112 S Huffer Ln, PO Box 15600, Flagstaff, AZ 86011, USA.

H These authors contributed equally to this work.

I Corresponding authors. Email: pgwnh78@163.com; heshuya8502@163.com

Environmental Chemistry 16(8) 577-586 https://doi.org/10.1071/EN19014
Submitted: 16 January 2019  Accepted: 14 May 2019   Published: 31 May 2019

Environmental context. Uranium-containing wastewaters have high potential to harm the environment and human health. We found that the combination of calix[4]arene with magnetic Fe3O4 particles produced good adsorption of uranium from wastewater. In addition, this material can be recycled and reused, so it has good prospects in practical applications for uranium remediation.

Abstract. A magnetic functionalised calix[4]arene composite consisting of Fe3O4 and calix[4]arene phosphonate derivative (CPD) was prepared through a facile self-assembly method. The composite was characterised by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and Fourier transform infrared spectroscopy (FTIR). The as-synthesised Fe3O4/CPD composite was used to remove UVI from aqueous solutions under different conditions. Meanwhile, the adsorption isotherm, kinetics and thermodynamics were fitted and analysed. The results show that the Fe3O4/CPD composite may be a promising adsorption material for the separation and enrichment of UVI from aqueous solutions in the cleanup of environmental pollution.

Additional keywords: calixarene, Fe3O4, magnetic materials, separation.


References

Akin I, Arslan G, Tor A, Cengeloglu Y, Ersoz M (2011). Removal of arsenate [As (V)] and arsenite [As (III)] from water by SWHR and BW-30 reverse osmosis. Desalination 281, 88–92.
Removal of arsenate [As (V)] and arsenite [As (III)] from water by SWHR and BW-30 reverse osmosisCrossref | GoogleScholarGoogle Scholar |

Aytas S, Yurtlu M, Donat R (2009). Adsorption characteristic of U (VI) ion onto thermally activated bentonite. Journal of Hazardous Materials 172, 667–674.
Adsorption characteristic of U (VI) ion onto thermally activated bentoniteCrossref | GoogleScholarGoogle Scholar | 19665840PubMed |

Bai ZQ, Yuan LY, Zhu L, Liu ZR, Chu SQ, Zheng LR, Zhang J, Chai ZF, Shi WQ (2015). Introduction of amino groups into acid-resistant MOFs for enhanced U (VI) sorption. Journal of Materials Chemistry. A, Materials for Energy and Sustainability 3, 525–534.
Introduction of amino groups into acid-resistant MOFs for enhanced U (VI) sorptionCrossref | GoogleScholarGoogle Scholar |

Bhatti AA, Memon S, Memon N (2014). Dichromate extraction by calix [4] arene appended amberlite XAD-4 resin. Separation Science and Technology 49, 664–672.
Dichromate extraction by calix [4] arene appended amberlite XAD-4 resinCrossref | GoogleScholarGoogle Scholar |

Bleise A, Danesi PR, Burkart W (2003). Properties, use and health effects of depleted uranium (DU): a general overview. Journal of Environmental Radioactivity 64, 93–112.
Properties, use and health effects of depleted uranium (DU): a general overviewCrossref | GoogleScholarGoogle Scholar | 12500797PubMed |

Cai Y, Wu C, Liu Z, Zhang L, Chen L, Wang J, Wang X, Yang S, Wang S (2017). Fabrication of a phosphorylated graphene oxide–chitosan composite for highly effective and selective capture of U (VI). Environmental Science. Nano 4, 1876–1886.
Fabrication of a phosphorylated graphene oxide–chitosan composite for highly effective and selective capture of U (VI)Crossref | GoogleScholarGoogle Scholar |

Chen C, Yang X, Wei J, Tan X, Wang X (2013). Eu (III) uptake on rectorite in the presence of humic acid: a macroscopic and spectroscopic study. Journal of Colloid and Interface Science 393, 249–256.
Eu (III) uptake on rectorite in the presence of humic acid: a macroscopic and spectroscopic studyCrossref | GoogleScholarGoogle Scholar | 23149106PubMed |

Chen Z, Wang J, Pu Z, Zhao Y, Jia D, Chen H, Wen T, Hu B, Alsaedi A, Hayat T (2017). Synthesis of magnetic Fe3O4/CFA composites for the efficient removal of U (VI) from wastewater. Chemical Engineering Journal 320, 448–457.
Synthesis of magnetic Fe3O4/CFA composites for the efficient removal of U (VI) from wastewaterCrossref | GoogleScholarGoogle Scholar |

Cheng W, Ding C, Wang X, Wu Z, Sun Y, Yu S, Hayat T, Wang X (2016). Competitive sorption of As (V) and Cr (VI) on carbonaceous nanofibers. Chemical Engineering Journal 293, 311–318.
Competitive sorption of As (V) and Cr (VI) on carbonaceous nanofibersCrossref | GoogleScholarGoogle Scholar |

Ding C, Cheng W, Wang X, Wu ZY, Sun Y, Chen C, Wang X, Yu SH (2016). Competitive sorption of Pb (II), Cu (II) and Ni (II) on carbonaceous nanofibers: a spectroscopic and modeling approach. Journal of Hazardous Materials 313, 253–261.
Competitive sorption of Pb (II), Cu (II) and Ni (II) on carbonaceous nanofibers: a spectroscopic and modeling approachCrossref | GoogleScholarGoogle Scholar | 27108273PubMed |

Ding L, Tan WF, Xie SB, Mumford K, Lv JW, Wang HQ, Fang Q, Zhang XW, Wu XY, Li M (2018). Uranium adsorption and subsequent re-oxidation under aerobic conditions by Leifsonia sp. -Coated biochar as green trapping agent. Environmental Pollution 242, 778–787.
Uranium adsorption and subsequent re-oxidation under aerobic conditions by Leifsonia sp. -Coated biochar as green trapping agentCrossref | GoogleScholarGoogle Scholar | 30031311PubMed |

Gao Q, Zhao A, Gan Z, Tao W, Li D, Zhang M, Guo H, Wang D, Sun H, Mao R (2012). Facile fabrication and growth mechanism of 3D flower-like Fe3O4 nanostructures and their application as SERS substrates. CrystEngComm 14, 4834–4842.
Facile fabrication and growth mechanism of 3D flower-like Fe3O4 nanostructures and their application as SERS substratesCrossref | GoogleScholarGoogle Scholar |

Gao J, Sun SP, Zhu WP, Chung TS (2014). Chelating polymer modified P84 nanofiltration (NF) hollow fiber membranes for high efficient heavy metal removal. Water Research 63, 252–261.
Chelating polymer modified P84 nanofiltration (NF) hollow fiber membranes for high efficient heavy metal removalCrossref | GoogleScholarGoogle Scholar | 25016298PubMed |

Gutsche CD (1998). ‘Calixarenes revisited.’ (Royal Society of Chemistry: London)

Gutsche CD, Iqbal M, Stewart D (1986). Calixarenes. 19. Syntheses procedures for p-tert-butylcalix [4] arene. The Journal of Organic Chemistry 51, 742–745.
Calixarenes. 19. Syntheses procedures for p-tert-butylcalix [4] areneCrossref | GoogleScholarGoogle Scholar |

Hadi P, To MH, Hui CW, Lin CSK, Mckay G (2015). Aqueous mercury adsorption by activated carbons. Water Research 73, 37–55.
Aqueous mercury adsorption by activated carbonsCrossref | GoogleScholarGoogle Scholar | 25644627PubMed |

Hu Y, Wang X, Zou Y, Wen T, Wang X, Alsaedi A, Hayat T, Wang X (2017). Superior sorption capacities of Ca-Ti and Ca-Al bimetallic oxides for U (VI) from aqueous solutions. Chemical Engineering Journal 316, 419–428.
Superior sorption capacities of Ca-Ti and Ca-Al bimetallic oxides for U (VI) from aqueous solutionsCrossref | GoogleScholarGoogle Scholar |

Hua B, Deng B (2008). Reductive immobilization of uranium (VI) by amorphous iron sulfide. Environmental Science & Technology 42, 8703–8708.
Reductive immobilization of uranium (VI) by amorphous iron sulfideCrossref | GoogleScholarGoogle Scholar |

Khan MH, Warwick P, Evans N (2006). Spectrophotometric determination of uranium with arsenazo-III in perchloric acid. Chemosphere 63, 1165–1169.
Spectrophotometric determination of uranium with arsenazo-III in perchloric acidCrossref | GoogleScholarGoogle Scholar | 16297431PubMed |

Ladeira ACQ, Morais CAD (2005). Uranium recovery from industrial effluent by ion exchange—column experiments. Minerals Engineering 18, 1337–1340.
Uranium recovery from industrial effluent by ion exchange—column experimentsCrossref | GoogleScholarGoogle Scholar |

Li J, Chen C, Zhang R, Wang X (2015). Nanoscale Zero‐Valent Iron Particles Supported on Reduced Graphene Oxides by Using a Plasma Technique and Their Application for Removal of Heavy‐Metal Ions. Chemistry: An Asian Journal 10, 1410–1417.
Nanoscale Zero‐Valent Iron Particles Supported on Reduced Graphene Oxides by Using a Plasma Technique and Their Application for Removal of Heavy‐Metal IonsCrossref | GoogleScholarGoogle Scholar |

Li J, Chen C, Zhang R, Wang X (2016). Reductive immobilization of Re (VII) by graphene modified nanoscale zero-valent iron particles using a plasma technique. Science China Chemistry 59, 150–158.
Reductive immobilization of Re (VII) by graphene modified nanoscale zero-valent iron particles using a plasma techniqueCrossref | GoogleScholarGoogle Scholar |

Li J, Wang X, Zhao G, Chen C, Chai Z, Alsaedi A, Hayat T, Wang X (2018). Metal–organic framework-based materials: superior adsorbents for the capture of toxic and radioactive metal ions. Chemical Society Reviews 47, 2322–2356.
Metal–organic framework-based materials: superior adsorbents for the capture of toxic and radioactive metal ionsCrossref | GoogleScholarGoogle Scholar | 29498381PubMed |

Liu M, Wen T, Wu X, Chen C, Hu J, Li J, Wang X (2013). Synthesis of porous Fe3O4 hollow microspheres/graphene oxide composite for Cr (VI) removal. Dalton Transactions 42, 14710–14717.
Synthesis of porous Fe3O4 hollow microspheres/graphene oxide composite for Cr (VI) removalCrossref | GoogleScholarGoogle Scholar | 23743481PubMed |

Liu W, Dai X, Wang Y, Song L, Zhang L, Zhang D, Xie J, Chen L, Diwu J, Wang J (2019). Ratiometric Monitoring of Thorium Contamination in Natural Water Using a Dual-Emission Luminescent Europium Organic Framework. Environmental Science & Technology 53, 332–341.
Ratiometric Monitoring of Thorium Contamination in Natural Water Using a Dual-Emission Luminescent Europium Organic FrameworkCrossref | GoogleScholarGoogle Scholar |

Lu X, He S, Zhang D, Reda AT, Liu C, Feng J, Yang Z (2016). Synthesis and characterization of amidoxime modified calix[8]arene for adsorption of U (VI) in low concentration uranium solutions. RSC Advances 6, 101087–101097.
Synthesis and characterization of amidoxime modified calix[8]arene for adsorption of U (VI) in low concentration uranium solutionsCrossref | GoogleScholarGoogle Scholar |

Manos MJ, Kanatzidis MG (2012). Layered metal sulfides capture uranium from seawater. Journal of the American Chemical Society 134, 16441–16446.
Layered metal sulfides capture uranium from seawaterCrossref | GoogleScholarGoogle Scholar | 23009164PubMed |

Manos MJ, Kanatzidis MG (2016). Metal sulfide ion exchangers: superior sorbents for the capture of toxic and nuclear waste-related metal ions. Chemical Science 7, 4804–4824.
Metal sulfide ion exchangers: superior sorbents for the capture of toxic and nuclear waste-related metal ionsCrossref | GoogleScholarGoogle Scholar | 30155129PubMed |

Meinrath G (1998). Aquatic chemistry of uranium. Geoscience 1, 101

Mellah A, Chegrouche S, Barkat M (2007). The precipitation of ammonium uranyl carbonate (AUC): thermodynamic and kinetic investigations. Hydrometallurgy 85, 163–171.
The precipitation of ammonium uranyl carbonate (AUC): thermodynamic and kinetic investigationsCrossref | GoogleScholarGoogle Scholar |

Meunier N, Drogui P, Montané C, Hausler R, Mercier G, Blais JF (2006). Comparison between electrocoagulation and chemical precipitation for metals removal from acidic soil leachate. Journal of Hazardous Materials 137, 581–590.
Comparison between electrocoagulation and chemical precipitation for metals removal from acidic soil leachateCrossref | GoogleScholarGoogle Scholar | 16600487PubMed |

Narayani M, Shetty KV (2013). Chromium-resistant bacteria and their environmental condition for hexavalent chromium removal: a review. Critical Reviews in Environmental Science and Technology 43, 955–1009.
Chromium-resistant bacteria and their environmental condition for hexavalent chromium removal: a reviewCrossref | GoogleScholarGoogle Scholar |

Nie R, Chang X, He Q, Hu Z, Li Z (2009). Preparation of p-tert [(dimethylamino) methyl]-calix[4]arene functionalized aminopropylpolysiloxane resin for selective solid-phase extraction and preconcentration of metal ions. Journal of Hazardous Materials 169, 203–209.
Preparation of p-tert [(dimethylamino) methyl]-calix[4]arene functionalized aminopropylpolysiloxane resin for selective solid-phase extraction and preconcentration of metal ionsCrossref | GoogleScholarGoogle Scholar | 19398269PubMed |

Peng G, Ding D, Xiao F, Wang X, Hun N, Wang Y, Dai Y, Cao Z (2014). Adsorption of uranium ions from aqueous solution by amine-group functionalized magnetic Fe3O4 nanoparticle. Journal of Radioanalytical and Nuclear Chemistry 301, 781–788.
Adsorption of uranium ions from aqueous solution by amine-group functionalized magnetic Fe3O4 nanoparticleCrossref | GoogleScholarGoogle Scholar |

Pu YQ, Xiao F, He S, Wang C, Peng GW, Liu Y (2017). Synthesis of the p-tert-butyl calix[4]arene symmetrical sulfide derivatives and its extraction properties towards U (VI) from aqueous solution. Journal of Radioanalytical and Nuclear Chemistry 314, 2137–2143.
Synthesis of the p-tert-butyl calix[4]arene symmetrical sulfide derivatives and its extraction properties towards U (VI) from aqueous solutionCrossref | GoogleScholarGoogle Scholar |

Ren X, Li J, Tan X, Wang X (2013). Comparative study of graphene oxide, activated carbon and carbon nanotubes as adsorbents for copper decontamination. Dalton Transactions 42, 5266–5274.
Comparative study of graphene oxide, activated carbon and carbon nanotubes as adsorbents for copper decontaminationCrossref | GoogleScholarGoogle Scholar | 23420275PubMed |

Sun Y, Yang S, Sheng G, Wang Q, Guo Z, Wang X (2012). Removal of U (VI) from aqueous solutions by the nano-iron oxyhydroxides. Radiochimica Acta 100, 779–784.
Removal of U (VI) from aqueous solutions by the nano-iron oxyhydroxidesCrossref | GoogleScholarGoogle Scholar |

Sun Y, Shao D, Chen C, Yang S, Wang X (2013). Highly efficient enrichment of radionuclides on graphene oxide-supported polyaniline. Environmental Science & Technology 47, 9904–9910.
Highly efficient enrichment of radionuclides on graphene oxide-supported polyanilineCrossref | GoogleScholarGoogle Scholar |

Sun Y, Ding C, Cheng W, Wang X (2014). Simultaneous adsorption and reduction of U (VI) on reduced graphene oxide-supported nanoscale zerovalent iron. Journal of Hazardous Materials 280, 399–408.
Simultaneous adsorption and reduction of U (VI) on reduced graphene oxide-supported nanoscale zerovalent ironCrossref | GoogleScholarGoogle Scholar | 25194557PubMed |

Sun Y, Yang S, Chen Y, Ding C, Cheng W, Wang X (2015). Adsorption and desorption of U (VI) on functionalized graphene oxides: a combined experimental and theoretical study. Environmental Science & Technology 49, 4255–4262.
Adsorption and desorption of U (VI) on functionalized graphene oxides: a combined experimental and theoretical studyCrossref | GoogleScholarGoogle Scholar |

Sun Y, Wu ZY, Wang X, Ding C, Cheng W, Yu SH, Wang X (2016a). Macroscopic and microscopic investigation of U (VI) and Eu (III) adsorption on carbonaceous nanofibers. Environmental Science & Technology 50, 4459–4467.
Macroscopic and microscopic investigation of U (VI) and Eu (III) adsorption on carbonaceous nanofibersCrossref | GoogleScholarGoogle Scholar |

Sun Y, Zhang R, Ding C, Wang X, Cheng W, Chen C, Wang X (2016b). Adsorption of U (VI) on sericite in the presence of Bacillus subtilis: a combined batch, EXAFS and modeling techniques. Geochimica et Cosmochimica Acta 180, 51–65.
Adsorption of U (VI) on sericite in the presence of Bacillus subtilis: a combined batch, EXAFS and modeling techniquesCrossref | GoogleScholarGoogle Scholar |

Tan X, Fan Q, Wang X, Grambow B (2009). Eu (III) sorption to TiO2 (anatase and rutile): batch, XPS, and EXAFS studies. Environmental Science & Technology 43, 3115–3121.
Eu (III) sorption to TiO2 (anatase and rutile): batch, XPS, and EXAFS studiesCrossref | GoogleScholarGoogle Scholar |

Wang X, Yang S, Shi W, Li J, Hayat T, Wang X (2015a). Different interaction mechanisms of Eu (III) and 243Am (III) with carbon nanotubes studied by batch, spectroscopy technique and theoretical calculation. Environmental Science & Technology 49, 11721–11728.
Different interaction mechanisms of Eu (III) and 243Am (III) with carbon nanotubes studied by batch, spectroscopy technique and theoretical calculationCrossref | GoogleScholarGoogle Scholar |

Wang Y, Liu Z, Li Y, Bai Z, Liu W, Wang Y, Xu X, Xiao C, Sheng D, Diwu J (2015b). Umbellate distortions of the uranyl coordination environment result in a stable and porous polycatenated framework that can effectively remove cesium from aqueous solutions. Journal of the American Chemical Society 137, 6144–6147.
Umbellate distortions of the uranyl coordination environment result in a stable and porous polycatenated framework that can effectively remove cesium from aqueous solutionsCrossref | GoogleScholarGoogle Scholar | 25939750PubMed |

Wang P, Wang X, Yu S, Zou Y, Jian W, Chen Z, Alharbi NS, Alsaedi A, Hayat T, Chen Y (2016a). Silica coated Fe3O4 magnetic nanospheres for high removal of organic pollutants from wastewater. Chemical Engineering Journal 306, 280–288.
Silica coated Fe3O4 magnetic nanospheres for high removal of organic pollutants from wastewaterCrossref | GoogleScholarGoogle Scholar |

Wang X, Fan Q, Yu S, Chen Z, Ai Y, Sun Y, Hobiny A, Alsaedi A, Wang X (2016b). High sorption of U (VI) on graphene oxides studied by batch experimental and theoretical calculations. Chemical Engineering Journal 287, 448–455.
High sorption of U (VI) on graphene oxides studied by batch experimental and theoretical calculationsCrossref | GoogleScholarGoogle Scholar |

Wang X, Yu S, Jin J, Wang H, Alharbi NS, Alsaedi A, Hayat T, Wang X (2016c). Application of graphene oxides and graphene oxide-based nanomaterials in radionuclide removal from aqueous solutions. Science Bulletin 61, 1583–1593.
Application of graphene oxides and graphene oxide-based nanomaterials in radionuclide removal from aqueous solutionsCrossref | GoogleScholarGoogle Scholar |

Wang C, Xiao FZ, Pu YQ, Xu YL, Xu DY, Zhang K, Liu Y, Peng GW (2018a). Preparation of p-carboxyphenyl azo calix[4]arene phosphate derivative and its extraction properties toward uranium (VI). Journal of Radioanalytical and Nuclear Chemistry 317, 1235–1241.
Preparation of p-carboxyphenyl azo calix[4]arene phosphate derivative and its extraction properties toward uranium (VI)Crossref | GoogleScholarGoogle Scholar |

Wang Y, Yin X, Liu W, Xie J, Chen J, Silver MA, Sheng D, Chen L, Diwu J, Liu N, Chai Z, Albrecht‐Schmitt TE, Wang S (2018b). Emergence of Uranium as a Distinct Metal Center for Building Intrinsic X‐ray Scintillators. Angewandte Chemie International Edition 57, 7883–7887.
Emergence of Uranium as a Distinct Metal Center for Building Intrinsic X‐ray ScintillatorsCrossref | GoogleScholarGoogle Scholar | 29600818PubMed |

Wen T, Wu X, Tan X, Wang X, Xu A (2013). One-pot synthesis of water-swellable Mg–Al layered double hydroxides and graphene oxide nanocomposites for efficient removal of As (V) from aqueous solutions. ACS Applied Materials & Interfaces 5, 3304–3311.
One-pot synthesis of water-swellable Mg–Al layered double hydroxides and graphene oxide nanocomposites for efficient removal of As (V) from aqueous solutionsCrossref | GoogleScholarGoogle Scholar |

Wu X, Tan X, Yang S, Wen T, Guo H, Wang X, Xu A (2013). Coexistence of adsorption and coagulation processes of both arsenate and NOM from contaminated groundwater by nanocrystallined Mg/Al layered double hydroxides. Water Research 47, 4159–4168.
Coexistence of adsorption and coagulation processes of both arsenate and NOM from contaminated groundwater by nanocrystallined Mg/Al layered double hydroxidesCrossref | GoogleScholarGoogle Scholar | 23582669PubMed |

Wu Y, Pang H, Yao W, Wang X, Yu S, Yu Z, Wang X (2018). Synthesis of rod-like metal-organic framework (MOF-5) nanomaterial for efficient removal of U (VI): batch experiments and spectroscopy study. Science Bulletin 63, 831–839.
Synthesis of rod-like metal-organic framework (MOF-5) nanomaterial for efficient removal of U (VI): batch experiments and spectroscopy studyCrossref | GoogleScholarGoogle Scholar |

Xiao F, Peng G, Ding D, Dai Y (2015). Preparation of a novel biosorbent ISCB and its adsorption and desorption properties of uranium ions in aqueous solution. Journal of Radioanalytical and Nuclear Chemistry 306, 349–356.
Preparation of a novel biosorbent ISCB and its adsorption and desorption properties of uranium ions in aqueous solutionCrossref | GoogleScholarGoogle Scholar |

Xiao C, Hassanzadeh Fard Z, Sarma D, Song TB, Xu C, Kanatzidis MG (2017). Highly efficient separation of trivalent minor actinides by a layered metal sulfide (KInSn2S6) from acidic radioactive waste. Journal of the American Chemical Society 139, 16494–16497.
Highly efficient separation of trivalent minor actinides by a layered metal sulfide (KInSn2S6) from acidic radioactive wasteCrossref | GoogleScholarGoogle Scholar | 29108414PubMed |

Yaftian M, Taheri R, Zamani A, Matt D (2004). Thermodynamics of the solvent extraction of thorium and europium nitrates by neutral phosphorylated ligands. Journal of Radioanalytical and Nuclear Chemistry 262, 455–459.
Thermodynamics of the solvent extraction of thorium and europium nitrates by neutral phosphorylated ligandsCrossref | GoogleScholarGoogle Scholar |

Yang S, Sheng G, Montavon G, Guo Z, Tan X, Grambow B, Wang X (2013). Investigation of Eu (III) immobilization on γ-Al2O3 surfaces by combining batch technique and EXAFS analyses: role of contact time and humic acid. Geochimica et Cosmochimica Acta 121, 84–104.
Investigation of Eu (III) immobilization on γ-Al2O3 surfaces by combining batch technique and EXAFS analyses: role of contact time and humic acidCrossref | GoogleScholarGoogle Scholar |

Zhang F, Wang B, He S, Man R (2014). Preparation of graphene-oxide/polyamidoamine dendrimers and their adsorption properties toward some heavy metal ions. Journal of Chemical & Engineering Data 59, 1719–1726.
Preparation of graphene-oxide/polyamidoamine dendrimers and their adsorption properties toward some heavy metal ionsCrossref | GoogleScholarGoogle Scholar |

Zhang YJ, Lan JH, Wang L, Wu QY, Wang CZ, Bo T, Chai ZF, Shi WQ (2016). Adsorption of uranyl species on hydroxylated titanium carbide nanosheet: A first-principles study. Journal of Hazardous Materials 308, 402–410.
Adsorption of uranyl species on hydroxylated titanium carbide nanosheet: A first-principles studyCrossref | GoogleScholarGoogle Scholar | 26859616PubMed |

Zhang C, Liu Y, Li X, Chen H, Wen T, Jiang Z, Ai Y, Sun Y, Hayat T, Wang X (2018). Highly uranium elimination by crab shells-derived porous graphitic carbon nitride: batch, EXAFS and theoretical calculations. Chemical Engineering Journal 346, 406–415.
Highly uranium elimination by crab shells-derived porous graphitic carbon nitride: batch, EXAFS and theoretical calculationsCrossref | GoogleScholarGoogle Scholar |

Zhao Y, Li J, Zhao L, Zhang S, Huang Y, Wu X, Wang X (2014). Synthesis of amidoxime-functionalized Fe3O4@ SiO2 core–shell magnetic microspheres for highly efficient sorption of U (VI). Chemical Engineering Journal 235, 275–283.
Synthesis of amidoxime-functionalized Fe3O4@ SiO2 core–shell magnetic microspheres for highly efficient sorption of U (VI)Crossref | GoogleScholarGoogle Scholar |

Zheng Q, Li Z, Miao X, Li J, Huang Y, Xia H, Xiong C (2017a). Preparation and characterization of novel organic chelating resin and its application in recovery of Zn (II) from aqueous solutions. Applied Organometallic Chemistry 31, e3546
Preparation and characterization of novel organic chelating resin and its application in recovery of Zn (II) from aqueous solutionsCrossref | GoogleScholarGoogle Scholar |

Zheng T, Yang Z, Gui D, Liu Z, Wang X, Dai X, Liu S, Zhang L, Gao Y, Chen L, Sheng D, Wang Y, Diwu J, Wang J, Zhou R, Chai Z, Albrecht-Schmitt TE, Wang S (2017b). Overcoming the crystallization and designability issues in the ultrastable zirconium phosphonate framework system. Nature Communications 8, 15369
Overcoming the crystallization and designability issues in the ultrastable zirconium phosphonate framework systemCrossref | GoogleScholarGoogle Scholar | 28555656PubMed |

Zhou L, Shang C, Liu Z, Huang G, Adesina AA (2012). Selective adsorption of uranium(VI) from aqueous solutions using the ion-imprinted magnetic chitosan resins. Journal of Colloid and Interface Science 366, 165–172.
Selective adsorption of uranium(VI) from aqueous solutions using the ion-imprinted magnetic chitosan resinsCrossref | GoogleScholarGoogle Scholar | 22014393PubMed |

Zhu HY, Fu YQ, Jiang R, Jiang JH, Xiao L, Zeng GM, Zhao SL, Wang Y (2011). Adsorption removal of congo red onto magnetic cellulose/Fe3O4/activated carbon composite: Equilibrium, kinetic and thermodynamic studies. Chemical Engineering Journal 173, 494–502.
Adsorption removal of congo red onto magnetic cellulose/Fe3O4/activated carbon composite: Equilibrium, kinetic and thermodynamic studiesCrossref | GoogleScholarGoogle Scholar |

Zondervan E, Roffel B (2007). Evaluation of different cleaning agents used for cleaning ultra filtration membranes fouled by surface water. Journal of Membrane Science 304, 40–49.
Evaluation of different cleaning agents used for cleaning ultra filtration membranes fouled by surface waterCrossref | GoogleScholarGoogle Scholar |

Zong P, Wang S, Zhao Y, Wang H, Pan H, He C (2013). Synthesis and application of magnetic graphene/iron oxides composite for the removal of U (VI) from aqueous solutions. Chemical Engineering Journal 220, 45–52.
Synthesis and application of magnetic graphene/iron oxides composite for the removal of U (VI) from aqueous solutionsCrossref | GoogleScholarGoogle Scholar |

Zou YD, Cao XH, Luo XP, Liu Y, Hua R, Liu YH, Zhang ZB (2015). Recycle of U (VI) from aqueous solution by situ phosphorylation mesoporous carbon. Journal of Radioanalytical and Nuclear Chemistry 306, 515–525.
Recycle of U (VI) from aqueous solution by situ phosphorylation mesoporous carbonCrossref | GoogleScholarGoogle Scholar |