Triple-functional biohybrid for efficient Cr (VI) remediation: Synergistic adsorption, chemoreduction and bioreduction

IF 3.7 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biochemical Engineering Journal Pub Date : 2025-08-20 DOI:10.1016/j.bej.2025.109907

Xinyu Li, Mingzhao Liang, Zhihong Zhang, Jianfeng Zhang, Jing Liang

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Abstract

The reduction and adsorption of Cr(VI) are critical challenges in environmental remediation. In this study, corn straw modified with polyethyleneimine (PEI-CS) was synthesized as carriers to immobilize Bacillus licheniformis MZ1 (PEI-CS-MZ1), enabling simultaneous Cr(VI) reduction and Cr(III) fixation in a high efficiency. Notably, PEI-CS-MZ1 achieved 95.61 % and 81.96 % Cr(VI) reduction under extreme conditions (pH 8 and 11 % salinity), respectively. Furthermore, this composite completely reduced 100 mg/L Cr(VI) within 24 h while maintaining 76.96 % Cr(III) fixation, which was significantly superior to free MZ1 and PEI-CS. PEI-CS-MZ1 also demonstrated exceptional stability, retaining 89.8 % Cr(VI) reduction after 10 operational cycles. This strategy revealed that Cr(VI) reduction and Cr(III) fixation were accomplished via cooperativity of bio-reduction, chemical reduction, chemisorption, and physical adsorption. This work provides theoretical foundations for designing immobilized microbial systems toward efficient remediation of Cr(VI)-contaminated wastewater.

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高效修复Cr （VI）的三功能生物杂化：协同吸附、化学还原和生物还原

Cr（VI）的还原和吸附是环境修复中的关键问题。本研究以聚乙烯亚胺（PEI-CS）改性玉米秸秆为载体，固定化地衣芽孢杆菌MZ1 (PEI-CS-MZ1)，实现了Cr（VI）的高效还原和Cr（III）的同时固定。值得注意的是，PEI-CS-MZ1在极端条件下（pH为8和盐度为11 %）的Cr（VI）还原率分别达到95.61 %和81.96 %。此外，该复合材料在24 h内完全还原了100 mg/L Cr(VI)，同时保持76.96 % Cr（III）固定，显著优于游离MZ1和PEI-CS。PEI-CS-MZ1也表现出优异的稳定性，在10个操作循环后仍保持89.8 %的Cr（VI）还原。该策略表明，Cr（VI）还原和Cr（III）固定是通过生物还原、化学还原、化学吸附和物理吸附的协同作用完成的。本研究为设计固定化微生物系统高效修复Cr（VI）污染废水提供了理论基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biochemical Engineering Journal 工程技术-工程：化工

CiteScore

7.10

自引率

5.10%

发文量

380

审稿时长

34 days

期刊介绍： The Biochemical Engineering Journal aims to promote progress in the crucial chemical engineering aspects of the development of biological processes associated with everything from raw materials preparation to product recovery relevant to industries as diverse as medical/healthcare, industrial biotechnology, and environmental biotechnology. The Journal welcomes full length original research papers, short communications, and review papers* in the following research fields: Biocatalysis (enzyme or microbial) and biotransformations, including immobilized biocatalyst preparation and kinetics Biosensors and Biodevices including biofabrication and novel fuel cell development Bioseparations including scale-up and protein refolding/renaturation Environmental Bioengineering including bioconversion, bioremediation, and microbial fuel cells Bioreactor Systems including characterization, optimization and scale-up Bioresources and Biorefinery Engineering including biomass conversion, biofuels, bioenergy, and optimization Industrial Biotechnology including specialty chemicals, platform chemicals and neutraceuticals Biomaterials and Tissue Engineering including bioartificial organs, cell encapsulation, and controlled release Cell Culture Engineering (plant, animal or insect cells) including viral vectors, monoclonal antibodies, recombinant proteins, vaccines, and secondary metabolites Cell Therapies and Stem Cells including pluripotent, mesenchymal and hematopoietic stem cells; immunotherapies; tissue-specific differentiation; and cryopreservation Metabolic Engineering, Systems and Synthetic Biology including OMICS, bioinformatics, in silico biology, and metabolic flux analysis Protein Engineering including enzyme engineering and directed evolution.