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RESEARCH ARTICLE (Open Access)

Characterisation of biochar produced from two types of chestnut shells for use in remediation of cadmium- and lead-contaminated soil

Pingfan Zhou https://orcid.org/0000-0002-7700-3344 A , Muhammad Adeel A B , Manlin Guo A , Ling Ge C , Noman Shakoor A , Mingshu Li A , Yuanbo Li A , Guiyun Wang B and Yukui Rui https://orcid.org/0000-0003-2256-8804 A *
+ Author Affiliations
- Author Affiliations

A Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, People’s Republic of China.

B BNU-HKUST Laboratory of Green Innovation, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai 519087, People’s Republic of China.

C Institute for food and drug control, Zhuhai 519000, Guangdong, People’s Republic of China.

* Correspondence to: ruiyukui@163.com

Handling Editor: Zakaria Solaiman

Crop & Pasture Science - https://doi.org/10.1071/CP21297
Submitted: 6 May 2021  Accepted: 18 October 2021   Published online: 21 March 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

China is the major producer of chestnut, with 1.84 million tons of chestnut production, resulting in an enormous waste of chestnut shells. In the current study, shell biochar (SBC) was produced using the inside shell covering fruit, and the outside shell with thorns was used to produce thorn biochar (TBC). Both types of biochar were characterised through Brunauer–Emmett–Teller (BET) analysis, scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR). These analytical results showed a more obvious smooth surface and micro-pore structure in SBC. The vibration of C=O/C=C and C–O (phenolic) showed a significant difference between the two types of biochar. Sorption experiments indicated that the adsorption capacity of the different types of biochar for cadmium (Cd) did not differ significantly, whereas the adsorption capacity of TBC for lead was better than that of SBC. In the pakchoi cultivation experiment (28 days), the application of TBC (1.5%) promoted plant shoot weight, root weight, shoot length and root length by 465%, 143%, 109% and 97% respectively. The application of biochar effectively increased soil pH and reduced the bioavailability and migration of heavy metals. Besides, membrane integrity and chlorophyll content were enhanced because of the alleviation of oxidative stress. Noticeably, application of TBC (0.1% and 1.5%) reduced the Cd concentration in the root by 40–60%, and enhanced accumulation of Pb by 75–191%. Overall, our study demonstrated that 1.5% TBC has promising potential for remediating Cd-contaminated soil. Our study has demonstrated the remediation potential of chestnut and provided a clue for sustainable management of chestnut shell waste for further development of chestnut resources.

Keywords: adsorption, antioxidant enzymes, Cd, chestnut shell biochar, contaminated soil, pakchoi, Pb, remediation.


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