Biosorption capacity of Mucor circinelloides bioaugmented with Solanum nigrum L. for the cleanup of lead, cadmium and arsenic.
Biosorption capacity of Mucor circinelloides bioaugmented with Solanum nigrum L. for the cleanup of lead, cadmium and arsenic.
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DOI：
10.1016/j.ecoenv.2021.112014
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发表时间：
2021-02
影响因子：
6.8
通讯作者：
Xinxin Li;X. Lan;Xiuwei Feng;Xiaoyu Luan;X. Cao;Z. Cui
中科院分区：
文献类型：
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作者：
Xinxin Li;X. Lan;Xiuwei Feng;Xiaoyu Luan;X. Cao;Z. Cui
研究了卷枝毛霉（Mucor circinelloides）在不同接触时间、初始金属浓度和种类条件下对重金属的吸附和生物强化性能。微生物-植物互作对植物生长和减轻铅、镉、砷引起的氧化损伤具有协同作用。用M.在植物-微生物水体系中，类卷藻对铅、镉和砷的固定作用显著，表现为类卷藻对铅、镉和砷的迁移和生物有效性降低。铅、镉、砷主要分布在细胞壁上，少数进入细胞间，表明细胞壁吸附和细胞内富集是其主要机制。卷枝藻吸附动力学和吸附等温线均符合准二级动力学和Langmuir吸附模型，在pH 6.0和25 ℃下，真菌对铅、镉和砷的最大吸附量分别为500、15.4和29.4 mg·g− 1.最佳初始浓度为300-10-20 mg·L-1，接触时间为2 h。本研究为M.卷枝藻是一种很有前途的吸附剂和生物强化剂，可用于铅、镉、砷污染的土壤/水环境的净化。
The biosorption and bioaugmentation performances ofMucor circinelloideswere investigated under different contact time, initial metal(loid) concentration and species. The microbe-plant interaction appeared synergistic with enhancing plant growth and alleviating oxidative damages induced by lead, cadmium and arsenic. The bioaugmentation withM. circinelloidesled to significant immobilization on lead, cadmium and arsenic as indicated by the decreases of metal(loid) transfer and bioavailability in plant-microbe aqueous system. Lead, cadmium and arsenic were mainly allocated on cell wall and a few parts entered into intercellular system, suggesting cell wall adsorption and intracellular bioaccumulation served as the main mechanisms ofM. circinelloides. The adsorption kinetics and isotherms on lead, cadmium and arsenic were fitted well with the pseudo-second-order and Langmuir models, with the maximum adsorption capacities of 500, 15.4 and 29.4 mg·g−1fungal biomass at pH 6.0 and 25 ℃. The optimum initial concentration and contact time were 300–10–20 mg·L−1and 2 h. This study provides a basis forM. circinelloidesas a promising adsorbent and bioaugmented agent for the cleanup of soil/aqueous environment contaminated with lead, cadmium and arsenic.