Journal
JOURNAL OF CLEANER PRODUCTION
Volume 294, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2021.126278
Keywords
Biodegradable polymer; Heavy metal contaminated soil; Degradation mechanism; Nutrient release characteristics
Categories
Funding
- Shanxi Province 1331 Project Key Innovation Team of Polymeric Functional New Materials
- Shanxi Province Innovative Disciplinary Group of New Materials Industry
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The combination of three-dimensional cross-linked hydrophilic SAPs effectively reduces the inhibitory effects of soil heavy metals on the biodegradability of BDPs, allowing for more efficient supply of water and fertilizer in polluted soil.
Biodegradable polymer (BDP) composites with functions of nutrient slow release and water retention have been widely concerned in the agricultural field, but the effects of soil heavy metals (HMs) on their degradation and slow release performances have not been reported. Tomato pot experiments were employed to study degradation and nutrient release characteristics of a slow-release nanocomposite prepared by potassium dihydrogen phosphate and urea-formaldehyde (namely PSRF), simple physical mixtures or semi-interpenetrating polymer network (semi-IPN) nanocomposites of PSRF and a super absorbent polymer (SAP) in soil polluted by copper, zinc, cadmium and plumbum. Results show that the inhibitions of HMs on biodegradability and nutrient release of BDPs can be effectively reduced by combined with three-dimensional cross-linked hydrophilic SAPs, and their molecular segment scale mixing in semi-IPN composites possesses a more significant reduction effect than that of their simple mixtures. Meanwhile, the higher the number and activity of functional groups in introduced SAP, the more significant its adsorption and fixation to HMs, and the less the degradation inhibition caused by HMs. This strategy is suitable for the development of BDP-based composites, which can be applied to the simultaneous supplies of water and fertilizer in polluted soil. (c) 2021 Elsevier Ltd. All rights reserved.
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