School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China; Section of Soil and Crop Sciences, Cornell University, Ithaca, NY 14850, USA.
College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China.
Ecotoxicol Environ Saf. 2021 Apr 1;212:112014. doi: 10.1016/j.ecoenv.2021.112014. Epub 2021 Feb 3.
The biosorption and bioaugmentation performances of Mucor circinelloides were 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 with M. circinelloides led 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 of M. 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 fungal biomass at pH 6.0 and 25 ℃. The optimum initial concentration and contact time were 300-10-20 mg·L and 2 h. This study provides a basis for M. circinelloides as a promising adsorbent and bioaugmented agent for the cleanup of soil/aqueous environment contaminated with lead, cadmium and arsenic.
研究了不同接触时间、初始金属（类）浓度和种类下卷枝毛霉的生物吸附和生物增强性能。微生物-植物相互作用表现出协同作用，可促进植物生长并减轻铅、镉和砷诱导的氧化损伤。与对照相比，生物增强作用导致卷枝毛霉对铅、镉和砷的固定显著增加，这表明在植物-微生物水体系中，金属（类）的迁移和生物可利用性降低。铅、镉和砷主要分配在细胞壁上，部分进入细胞间系统，表明细胞壁吸附和细胞内生物累积是卷枝毛霉的主要作用机制。在 pH 6.0 和 25℃下，卷枝毛霉对铅、镉和砷的吸附动力学和等温线拟合良好，最大吸附容量分别为 500、15.4 和 29.4 mg·g 真菌生物质。最佳初始浓度和接触时间分别为 300-10-20 mg·L 和 2 h。本研究为卷枝毛霉作为一种有前途的吸附剂和生物增强剂，用于净化土壤/水环境污染中的铅、镉和砷提供了依据。
