An efficient lignin-biochar/ZnAl2O4/Bi2MoO6 composite photocatalyst for degradation of organic chlorine pollutants

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2025-05-30 DOI:10.1016/j.indcrop.2025.121263

Qingwen Tian , Yawei Zhu , Kuizhong Shen , Hang Yin , Aixiang Pan , Fengshan Zhang , Guigan Fang , Zhibin He , Yonghao Ni

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Abstract

Lignin, with its intrinsic polyphenolic structure, high carbon content, and diverse functional groups, has emerged as promising precursor for carbon-based materials in pollutant elimination. In this work, lignin-biochar (LC) was fabricated and integrated into LC/ZnAl₂O₄/Bi₂MoO₆ composites with adsorption-photocatalysis synergy, employed within an intimate coupling of photocatalysis and biodegradation (ICPB) system for AOX degradation. The formation of Bi-O-C bonds between lignin-biochar and Bi₂MoO₆ provides atomic-level channel for accelerating electron transfer. Notably, the 1 wt%LC/0.5 wt%ZnAl₂O₄/Bi₂MoO₆ (LM3) sample showed superior degradation efficiency, with the apparent rate constants of 13.82-fold (methylene blue, MB) and 5.56-fold (p-chlorophenol, 4-CP) higher than those of the pristine Bi₂MoO₆, respectively. DFT analyses demonstrated strong chemical adsorption interactions between 4-CP and lignin-biochar, with the highest adsorption energy of −46.3152 eV observed for LC/ZnAl₂O₄/Bi₂MoO₆. The synergistic adsorption-photocatalysis mechanism of the LC/ZnAl₂O₄/Bi₂MoO₆ composite was systematically explored, highlighting the critical role of lignin-biochar in enhancing adsorption, charge separation, and reactive oxygen species generation. The ICPB system demonstrated effective degradation of refractory 4-CP and bamboo ECF bleaching effluent. The visible-light driven ICPB system (VCPB) achieved 78.30 % TOC removal for 4-CP effluent within 24 h. Furthermore, the VCPB process achieved 80.03 % COD and 71.03 % AOX removals for an industrial bamboo ECF bleaching effluent sample, with long-term operational stability, while fostering robust microbial activity and enhanced biofilm diversity. The synergistic mechanism of the system between adsorption, photocatalysis, and biodegradation was discussed. This work provides a novel approach for designing bio-based photocatalysts for the degradation of refractory industrial effluents.

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木质素-生物炭/ZnAl2O4/Bi2MoO6复合光催化剂降解有机氯污染物

木质素以其固有的多酚结构、高含碳量和多种官能团而成为碳基材料在污染物消除方面的前驱体。在这项工作中，木质素-生物炭（LC）被制备并整合到LC/ZnAl2O4/Bi2MoO6复合材料中，具有吸附-光催化协同作用，在光催化和生物降解（ICPB）系统中用于降解AOX。木质素-生物炭与Bi2MoO6之间形成Bi-O-C键，为加速电子转移提供了原子级通道。值得注意的是，1 wt%LC/0.5 wt%ZnAl2O4/Bi2MoO6 （LM3）样品表现出较好的降解效率，其表观速率常数分别比原始Bi2MoO6高13.82倍（亚甲基蓝，MB）和5.56倍（对氯苯酚，4-CP）。DFT分析表明，4-CP与木质素-生物炭之间存在较强的化学吸附相互作用，LC/ZnAl2O4/Bi2MoO6的吸附能最高，为−46.3152 eV。系统探讨了LC/ZnAl2O4/Bi2MoO6复合材料的协同吸附-光催化机理，突出了木质素-生物炭在促进吸附、电荷分离和活性氧生成方面的关键作用。ICPB系统对难降解4-CP和竹材ECF漂白出水有较好的降解效果。可见光驱动的ICPB系统（VCPB）在24 h内对4-CP出水的TOC去除率达到78.30 %。此外，VCPB工艺对工业竹ECF漂白出水样品的COD去除率为80.03 %，AOX去除率为71.03 %，具有长期运行稳定性，同时培养了强大的微生物活性并增强了生物膜多样性。讨论了吸附、光催化和生物降解三者协同作用的机理。本研究为设计生物基光催化剂降解难降解工业废水提供了新的途径。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.