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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Thermosensitive methylcellulose spray-dried microcapsules as a controlled release carrier for soil management

Kailing Xiang A # , Youzhi Wu A # , Shuhong Li A , Jiacheng Chen A , Mengyang Xu A , Weisen Dai A and Jincheng Wang https://orcid.org/0000-0001-9815-4726 A *
+ Author Affiliations
- Author Affiliations

A College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, P. R. China.

* Correspondence to: wjc406@sues.edu.cn
# These authors contributed equally to this paper

Handling Editor: Richard Hoogenboom

Australian Journal of Chemistry 75(12) 953-965 https://doi.org/10.1071/CH22070
Submitted: 27 March 2022  Accepted: 23 June 2022   Published: 23 November 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

The excessive use of chemical products in agricultural production has brought many problems such as water pollution, air pollution, soil acidification and eutrophication of water bodies. Biodegradable methylcellulose microcapsules are used as carriers to achieve pollution-free and intelligent controlled release of agricultural chemical products. Methylcellulose was used as a coating material, loaded with fulvic acid (FA) and attapulgite (ATP), and then prepared into microcapsules by spray drying. The preparation process had good repeatability, and the obtained microcapsules possessed uniform particle size distribution. Methylcellulose microcapsules showed good heat sensitivity during water absorption process. The water absorption ratio was more than 10 times that of its own weight at 25°C, and the swelling ratio was 5–7 times that of its own weight at 35°C. The microcapsules reduced the loss of FA nearly 50% during the leaching process. Planting experiments showed that the microcapsules had good biocompatibility and exhibited obvious positive effects on the wheat growth.

Keywords: attapulgite, biocompatibility, controlled release, fulvic acid, intelligent, microcapsules, slow release, spray drying, thermosensitive.


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