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一种新型基于生物炭的复合水凝胶，用于去除水中的重金属并缓解烟草幼苗中的镉胁迫。

A novel biochar-based composite hydrogel for removing heavy metals in water and alleviating cadmium stress in tobacco seedlings.

机构信息

China Tobacco Hubei Industrial LLC, Wuhan, 430040, China.

出版信息

Sci Rep. 2023 Sep 20;13(1):15656. doi: 10.1038/s41598-023-41946-0.

DOI:10.1038/s41598-023-41946-0
PMID:37730828
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10511474/
Abstract

A novel composite hydrogel (AM/CMC/B) synthesized from peanut shell biochar effectively adsorbs heavy metal Cd in water and reduces its toxicity to tobacco seedlings. The hydrogel, prepared via hydrothermal polymerization using acrylamide (AM), carboxymethyl cellulose (CMC), and peanut shell biochar (B), exhibited a maximum adsorption capacity of 164.83 mg g for Cd and followed a pseudo-second-order kinetic model. In pot experiments, the application of exogenous AM/CMC/B mitigated the inhibitory effects of Cd-contaminated soil on tobacco seedling growth. Addition of 10 mg kg Cd resulted in improved phenotype, root system development, enhanced photosynthetic capacity, stomatal conductance (Gs), stomatal number, and increased antioxidant activity while reducing MDA content and leaf cell death. These findings highlight the potential of AM/CMC/B as an environmentally friendly adsorbent for Cd removal from water and for reducing Cd stress toxicity in tobacco and other plants.

摘要

一种由花生壳生物炭合成的新型复合水凝胶（AM/CMC/B）可有效吸附水中的重金属 Cd，并降低其对烟草幼苗的毒性。该水凝胶通过丙烯酰胺（AM）、羧甲基纤维素（CMC）和花生壳生物炭（B）的水热聚合制备，对 Cd 的最大吸附容量为 164.83mg/g，符合准二级动力学模型。在盆栽实验中，施加外源 AM/CMC/B 减轻了 Cd 污染土壤对烟草幼苗生长的抑制作用。添加 10mg/kg Cd 可改善表型、根系发育、增强光合能力、气孔导度（Gs）、气孔数，并提高抗氧化活性，同时降低 MDA 含量和叶片细胞死亡。这些发现表明 AM/CMC/B 作为一种环保型吸附剂，有望用于从水中去除 Cd，并降低 Cd 对烟草和其他植物的胁迫毒性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/147d/10511474/1899187aee93/41598_2023_41946_Fig10_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/147d/10511474/1899187aee93/41598_2023_41946_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/147d/10511474/d28b19efb3fe/41598_2023_41946_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/147d/10511474/7f750811d7a7/41598_2023_41946_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/147d/10511474/679e4a0d711d/41598_2023_41946_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/147d/10511474/434529f0b924/41598_2023_41946_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/147d/10511474/bcc17caec696/41598_2023_41946_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/147d/10511474/1899187aee93/41598_2023_41946_Fig10_HTML.jpg

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