基于可持续竹炭的纳米复合催化剂用于快速吸附和光-芬顿降解有毒染料

IF 8.6 2区 工程技术 Q1 ENERGY & FUELS
Xuebing Ji , Ziguang Tan , Haiyan Yang , Zhengjun Shi , Jing Yang , A. Alhadhrami , Jing Zhang , Gaber A.M. Mersal , Zeinhom M. El-Bahy , Zhanhu Guo , Dawei Wang
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引用次数: 0

摘要

为了高效、彻底地去除水中的有机污染物,开发兼具吸附和光催化/芬顿催化降解功能的复合催化剂是一个非常可行的解决方案。本文采用 Cu2+/melamine 改性竹粉在 N2 气氛中原位热解的方法,制备了一种新型 CuxO 和 g-C3N4 共掺竹炭(BC)复合材料(Cu-g-C3N4/BC)。在Cu-g-C3N4/BC(600)/H2O2体系催化下,亚甲基蓝(MB)和罗丹明B(RhB)染料可在10分钟内完全降解,甲基橙(MO)可在30分钟内降解,表明催化剂具有较高的催化效率。电子顺磁共振(EPR)测试和活性物种捕获实验表明,∙OH 是降解过程中的主要活性物种,而 -O2- 和 h+ 的作用较小。Cu-g-C3N4/BC 中 Cu2O、CuO 和 g-C3N4 活性位点的协同作用增加了光生电子的密度,并通过异质结促进了电子-空穴对的分离。竹炭基质在吸附染料和 H2O2 的过程中发挥了重要作用,大大促进了 H2O2 的活化和染料的降解。此外,竹炭的高导电性也有利于电荷从活性位点转移到 H2O2。由于结构稳定,制备的 Cu-g-C3N4/BC 催化剂具有良好的重复使用性。这项研究为快速消除持久性有机污染物提供了一种具有多个活性位点的竹炭催化剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sustainable bamboo charcoal based nanocomposite catalysts for rapid adsorption and photo-Fenton degradation of toxic dyes

Sustainable bamboo charcoal based nanocomposite catalysts for rapid adsorption and photo-Fenton degradation of toxic dyes

To efficiently and completely remove organic pollutants from water, developing composite catalysts with both adsorption and photocatalytic/Fenton catalytic degradation is a very feasible solution. Herein, a new CuxO and g-C3N4 codoped bamboo charcoal (BC) composite (Cu-g-C3N4/BC) was prepared by the in-situ pyrolysis of Cu2+/melamine modified bamboo powders in N2 atmosphere. Under the catalysis of Cu-g-C3N4/BC(600)/H2O2 system, the methylene blue (MB) and rhodamine B (RhB) dyes can be completely degraded within 10 min, and the methyl orange (MO) can be degraded within 30 min, indicating a high catalytic efficiency of the catalyst. Electron paramagnetic resonance (EPR) tests and active species trapping experiments suggested that ∙OH was the main active species in the degradation process, while the ·O2 and h+ played a minor role. The synergy of Cu2O, CuO and g-C3N4 active sites in Cu-g-C3N4/BC increases the density of photogenerated electrons and promotes the separation of electron-hole pairs via the heterojunctions. The bamboo charcoal matrix plays an important role in the process of adsorbing the dyes and H2O2, which greatly promotes the activation of H2O2 and the degradation of dyes. In addition, the high conductivity of bamboo charcoal facilitates the charge transfer from the active sites to H2O2. The as-prepared Cu-g-C3N4/BC catalyst exhibits good reusability due to its structural stability. This work offers a promising bamboo charcoal catalyst with multiple active sites for the rapid elimination of persistent organic pollutants.

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来源期刊
Sustainable Materials and Technologies
Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment
CiteScore
13.40
自引率
4.20%
发文量
158
审稿时长
45 days
期刊介绍: Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.
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