Catalytic degradation of Reactive Black 5 through peroxymonosulfate activation with Co organic frameworks combined with graphite oxide

IF 4.3 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
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Abstract

The development of high-efficiency catalysts for peroxymonosulfate (PMS) activation is critical for pollutant treatment in environmental applications. In this research, a Co organic framework (CoHHTP) combined with graphene oxide (GO) (CoHHTP/GO) with a 2D structure was prepared for PMS activation to treat the azo dye Reactive Black 5 (RBK5). The combination of CoHHTP and GO via oxygen groups resulted in the high activity of CoHHTP/GO, and almost 100 % performance was achieved within 30 min under various pH, temperature, PMS loading, and catalyst loading conditions. The maximum RBK5 removal efficiency was obtained with a catalyst loading of 3.0 g L−1, PMS loading of 0.5 mM, temperature of 25 °C, and pH of 6 with a pseudo-first-order kinetics k value of 0.1903 min−1. The activation energy of the CoHHTP/GO/PMS/RBK5 system was calculated to be 14.34 kJ mol−1. Meanwhile, radicals and nonradicals, including SO4·−, ·OH, ·O2, and 1O2, were proven to be generated and involved in RBK5 degradation. Moreover, RBK5 degradation pathways were identified through experimental research and density functional theory calculation.

Abstract Image

用结合氧化石墨的 Co 有机框架通过过一硫酸盐活化催化降解活性黑 5
开发用于过一硫酸盐(PMS)活化的高效催化剂对于环境应用中的污染物处理至关重要。本研究制备了具有二维结构的 Co 有机框架(CoHHTP)与氧化石墨烯(GO)(CoHTP/GO),用于活化 PMS,以处理偶氮染料活性黑 5(RBK5)。在不同的 pH 值、温度、PMS 负载和催化剂负载条件下,CoHHTP/GO 在 30 分钟内几乎达到了 100% 的性能。在催化剂负载量为 3.0 g L-1、PMS 负载量为 0.5 mM、温度为 25 °C、pH 为 6 的条件下,RBK5 的去除率最高,伪一阶动力学 k 值为 0.1903 min-1。计算得出 CoHHTP/GO/PMS/RBK5 系统的活化能为 14.34 kJ mol-1。同时,证明了在 RBK5 降解过程中会产生自由基和非自由基,包括 SO4-、-OH、-O2- 和 1O2。此外,通过实验研究和密度泛函理论计算,还确定了 RBK5 的降解途径。
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来源期刊
Journal of Physics and Chemistry of Solids
Journal of Physics and Chemistry of Solids 工程技术-化学综合
CiteScore
7.80
自引率
2.50%
发文量
605
审稿时长
40 days
期刊介绍: The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.
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