Co–Cu–Al Layered Double Oxides as Heterogeneous Catalyst for Enhanced Degradation of Organic Pollutants in Wastewater by Activating Peroxymonosulfate: Performance and Synergistic Effect

Abstract

In order to exploit Co–Cu synergistic effect to develop catalyst with high activity, CoCuAl-layered double oxides was synthesized from CoCuAl-layered double hydroxides. The prepared CoCuAl-LDOs possessed high purity, uniform morphology, and a large special surface area (103.8 m2/g). CoCuAl-LDOs is an efficient catalyst for activating peroxymonosulfate (PMS) to degrade organic pollutants. Acid orange 7 (AO7, 20 mg/L) can be completely degraded within 30 min using 0.1 g/L CoCuAl-LDOs and 0.1 g/L PMS. The CoCuAl-LDOs/PMS system also exhibited good performance over a wide pH range. SO4 •– was identified as the main reactive species responsible for pollutant degradation. More importantly, the structure–property relationship was investigated by H2-TPR and XPS. It was found that the high performance of CoCuAl-LDOs is attributed to the Co–Cu synergistic effect which can accelerate the redox cycle of Co2+/Co3+. This study sheds light on the Co–Cu synergistic effect for developing catalyst with high performance toward activating PMS in environmental remediation.

Highly Efficient Peroxymonosulfate Activation by Surface Oxidized Nickel Phosphide with Dual Active Sites

“…Notably, the degradation efficiency can be greatly enhanced when the PMS concentration is changed from 100 to 150 mg L –1 and the corresponding reaction rate constant is increased by 2.9 times. However, further increase in the PMS concentration causes a relatively slight enhancement of degradation efficiency, due to the possible self-scavenging effect of radical species at high PMS concentration. , …”

“…However, further increase in the PMS concentration causes a relatively slight enhancement of degradation efficiency, due to the possible self-scavenging effect of radical species at high PMS concentration. 25,26 The relationship between initial MB concentration and degradation efficiency is illustrated in Figure 4 panels e and f. With increasing MB concentration, degradation efficiency and reaction rate constant will be decreased.…”

Partial Oxidation Strategy to Synthesize WS2/WO3 Heterostructure with Enhanced Adsorption Performance for Organic Dyes: Synthesis, Modelling, and Mechanism

“…Consequently, it is urgent to develop low-cost and efficient methods to remove these organic dyes from wastewater. Various technologies have been developed and employed for treating wastewater, including membrane filtration, electrochemical decolorization, photocatalytic degradation, chemical oxidation/reduction, biodegradation, and adsorption [2,[5][6][7][8][9][10][11][12][13][14][15]. Among them, adsorption is considered a promising candidate to eliminate dyes from industrial wastewater due to the low capital (0.894 g) was dissolved in NMP (70 mL), and this suspension was stirred for 10 min to obtain a dark brown solution.…”

Three-Dimensional Spherical CuCoAlOx Catalyst with a Micro-/Nanoporous Structure for Low-Temperature CO-SCR Denitration

“…In Figure d, the O 1s spectrum is divided into three peaks between 527.0 and 537.0 eV . Specifically, the peaks at 529.6, 531.2, and 532.8 eV correspond to lattice oxygen bound to metal cations (O α ), surface oxygen vacancies (O β ), and surface-adsorbed oxygen (O γ ), respectively. , The presence of O β and O γ is conducive to the SCR process, leading to the conversion of NO to NO 2 , which has a positive effect on the CO-SCR reaction. , As can be seen from Table , the (O β + O γ )/(O α + O β + O γ ) ratio of the three catalyst samples, obtained by calculating the peak areas of the three O 1s peaks, decreased in the order CuCoAlO x (CP-SD) > CuCoAlO x (SD) > CuCoAlO x (CP). In particular, the O 1s binding energy of the CuCoAlO x (SD) and CuCoAlO x (CP-SD) catalysts was slightly lower than that of the CuCoAlO x (CP) catalyst.…”

“…35 Specifically, the peaks at 529.6, 531.2, and 532.8 eV correspond to lattice oxygen bound to metal cations (O α ), surface oxygen vacancies (O β ), and surface-adsorbed oxygen (O γ ), respectively. 36,37 The presence of O β and O γ is conducive to the SCR process, leading to the conversion of NO to NO 2 , which has a positive effect on the CO-SCR reaction. 38,39 As can be seen from Table 2, In particular, the O 1s binding energy of the CuCoAlO x (SD) and CuCoAlO x (CP-SD) catalysts was slightly lower than that of the CuCoAlO x (CP) catalyst.…”