“Small amount for multiple times” of H2O2 feeding way in MoS2-Fex heterogeneous fenton for enhancing sulfadiazine degradation

IF 9.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Zhuan Chen , Cheng Lian , Kai Huang , Jiahui Ji , Qingyun Yan , Jinlong Zhang , Mingyang Xing
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引用次数: 28

Abstract

In recent years, MoS2 catalyzed/cocatalyzed Fenton/Fenton-like systems have attracted wide attention in the field of pollution control, but there are few studies on the effect of H2O2 feeding way on the whole Fenton process. Here, we report a new type of composite catalyst (MoS2-Fex) prepared in a simple way with highly dispersed iron to provide more active sites. MoS2-Fex was proved to possess selectivity for singlet oxygen (1O2) in effectively degrading sulfadiazine with a wide pH adaptability (4.0∼10.0). Importantly, the mechanism of the interaction between H2O2 and MoS2 on the Fenton reaction activity was revealed through the combination of experiment and density functional theory (DFT) calculations. Compared to the traditional “a large amount for one time” feeding way of H2O2, the “small amount for multiple times” of H2O2 feeding way can increase the degradation rate of sulfadiazine from 36.9% to 91.1% in the MoS2-Fex heterogeneous Fenton system. It is demonstrated that the “small amount for multiple times” of H2O2 feeding way can reduce the side reaction of decomposition of H2O2 by MoS2 and effectively improve the utilization rate of H2O2 and the stability of MoS2-Fex. Compared with Fe2O3-based Fenton system, MoS2-Fex can significantly save the amount of H2O2. Compared with nano-iron powder, the formation of iron sludge in MoS2-Fex system was significantly reduced. Furthermore, long-term degradation test showed that the MoS2-Fe75/H2O2 system could maintain the effectiveness of degrading organic pollutants for 10 days (or even longer). This study has a guiding significance for the large-scale treatment of industrial wastewater by improved Fenton technology in the future.

Abstract Image

在MoS2-Fex非均相fenton中采用“少量多次”H2O2进料方式,增强磺胺嘧啶的降解
近年来,MoS2催化/共催化Fenton/类Fenton体系在污染治理领域受到了广泛关注,但关于H2O2进料方式对整个Fenton过程影响的研究很少。本文报道了一种新型的复合催化剂(MoS2-Fex),它是由高度分散的铁以一种简单的方式制备的,以提供更多的活性位点。MoS2-Fex被证明对单线态氧(1O2)具有选择性,可有效降解磺胺嘧啶,pH适应性宽(4.0 ~ 10.0)。重要的是,通过实验和密度泛函理论(DFT)计算相结合,揭示了H2O2与MoS2相互作用对Fenton反应活性的影响机理。在MoS2-Fex非均相Fenton体系中,与传统的“一次大量”H2O2加料方式相比,“少量多次”H2O2加料方式可将磺胺嘧啶的降解率从36.9%提高到91.1%。结果表明,“少量多次”的H2O2加料方式可以减少MoS2分解H2O2的副反应,有效提高H2O2的利用率和MoS2- fex的稳定性。与基于fe2o3的Fenton体系相比,MoS2-Fex可以显著节约H2O2的用量。与纳米铁粉相比,MoS2-Fex体系中铁污泥的形成明显减少。此外,长期降解试验表明,MoS2-Fe75/H2O2体系可以保持10天(甚至更长)的降解有机污染物的效果。本研究对今后改进Fenton技术大规模处理工业废水具有指导意义。
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
Chinese Chemical Letters
Chinese Chemical Letters 化学-化学综合
CiteScore
14.10
自引率
15.40%
发文量
8969
审稿时长
1.6 months
期刊介绍: Chinese Chemical Letters (CCL) (ISSN 1001-8417) was founded in July 1990. The journal publishes preliminary accounts in the whole field of chemistry, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry, polymer chemistry, applied chemistry, etc.Chinese Chemical Letters does not accept articles previously published or scheduled to be published. To verify originality, your article may be checked by the originality detection service CrossCheck.
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