Controlled leaching with prolonged activity for Co–LDH supported catalyst during treatment of organic dyes using bicarbonate activation of hydrogen peroxide

Ali, Jawad; Li, Yibing; Lü, Xiaoyan; Chen, Zhuqi; Liu, Weidong; Yin, Guochuan

doi:10.1016/j.jhazmat.2015.02.056

Cited by 88 publications

(25 citation statements)

References 46 publications

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“…Besides, the basic character, memory effect, and good thermal stability are the additional distinguishing features associated with LDH based catalysts. Co-LDH catalysts appeared to possess outstanding efficiency and stability in bicarbonate activated H 2 O 2 system, in contrast to the acidic conditions of traditional Fe 2+ -Fenton, H 2 O 2 /Co-LDH systems, indicating the performance could maintain in a wide pH range of 5–12 by diverse free radicals [18]. The co-precipitation method is the most commonly used synthetic technique for LDHs, which use M 2+ (or M 2+ mixtures) and M 3+ (or M 3+ mixtures) aqueous solutions as precursors [19].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Phenol Using Peroxymonosulfate Activated by a High Efficiency and Stable CoMgAl-LDH Catalyst

et al. 2019

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In this study, we report on an active and stable CoMgAl layered double hydrotalcite (LDH) catalyst for phenol degradation by heterogeneous activation of peroxymonosulfate (PMS). The CoMgAl-LDH catalyst was synthesized by hydrothermal method. The PMS/CoMgAl-LDH system overcomes the drawbacks of traditional Fenton processes. Various effects, e.g., scavengers, chloride ion, catalyst dosage, PMS concentration, temperature, and pH, were also inspected to evaluate the system. The results indicated that the PMS/CoMgAl-LDH system had extremely high efficiency for phenol degradation; 0.1 mM phenol could be completely degraded by 0.3 g/L catalyst and 3 mM PMS within 60 min at 30 °C. The CoMgAl-LDH catalyst appeared to possess outstanding reusability and stability. After four rounds of recycling, nearly 100% of the phenol was removed within 80 min by the PMS/CoMgAl-LDH system, with only 0.05 mg/L Co2+ leaching. A sulfate radical was the main oxidation species in the PMS/Co-LDH system. The degradation rate of phenol was influenced by temperature, and the activation energy was 65.19 kJ/mol. These advantages proved the PMS/CoMgAl-LDH system is an effective strategy for the treatment of organic contaminants.

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Section: Introductionmentioning

confidence: 99%

Degradation of Phenol Using Peroxymonosulfate Activated by a High Efficiency and Stable CoMgAl-LDH Catalyst

et al. 2019

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“…图 2 三维分层铜铝水滑石(CuAl-LDH)催化芬顿反应降解MO的性能研究. H 2 O 2 用量(a), CuAl-LDH用量(b), 温度(c), 水滑石种类(d)对MO降解效率的影响 [27] (网络版彩图) Jawad等 [28] 采用CoMgAl水滑石催化分解经碳酸除染料降解外, 芬顿反应还可以用来降解一些工业废弃物中常见的有机反应原料或反应中间体, 如硝基苯、苯酚等. Bai等 [30] 采用钴铁水滑石(CoFe-LDH)…”

Section: 这些有机污染物由于其毒性和非生物降解性对人体unclassified

Research progress of LDHs as Fenton reaction catalysts

Shao¹,

Han²,

Li³

et al. 2021

Sci. Sin.-Chim

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Fenton reaction utilizes the catalytic reaction of H 2 O 2 and Fe 2+ to generate highly active hydroxyl radicals (•OH) quickly to degrade organic compounds without the secondary pollution of by-products, which is widely used in the fields of environmental protection and sewage treatment. However, the difficulty of the regeneration of low-valence metals in the ordinary homogeneous Fenton reaction limits the efficiency of the overall reaction. In addition, the acidic requirements of the reaction system and the introduction of iron ions are not ideal from an environmental perspective. In recent years, layered double hydroxides (LDHs), as a unique layered material, have shown excellent catalytic performance in Fenton reaction and have attracted widespread attention. The active sites of LDHs are usually the metal ions fixed on the solid surface, which can avoid the leaching of metal ions and reduce the pH requirements of the reaction system. Besides, by adjusting the structure of the LDHs layers, a redox cycle of multiple metals can be formed, which promotes the regeneration of the low-valence metals effectively and thus improves the efficiency of the Fenton reaction. This review mainly summarizes the recent progress of LDHs materials as Fenton reaction catalysts. The challenge and prospective trends of LDHs materials as Fenton reaction catalysts are also discussed.

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“…Considering that the parameter a = 2 × d(110) corresponds to the cation-cation distance within the Brucite layer, and the parameter c = 3 × d(003) to its thickness, both parameters generally increase when Co 2+ cations are inserted into the lattice of the LDH structure due to a partial substitution of Al 3+ by Co 2+ . Because the ionic radius of Co 2+ is bigger than that of Al 3+ (ionic radius 0.065 nm for Co 2+ , and 0.054 nm for Al 3+ ) [25], the replacement of Al 3+ by Co 2+ causes the increase in cation-cation distance and reduces the electrostatic interaction and increase of interlayer distance [26].…”

Section: Characterization Of Samplesmentioning

confidence: 99%

Enhanced Visible-Light-Driven Photocatalytic Activity of ZnAl Layered Double Hydroxide by Incorporation of Co2+

Fan

Qin

et al. 2018

Bull. Chem. React. Eng. Catal.

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Co-doped ZnAl layered double hydroxides (LDH) were papered by coprecipitation. The prepared samples were characterized by multiple techniques including X-ray Diffraction (XRD), Brunauer−Emmett−Teller (BET) surface area, Scanning Electronic Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and UV−Vis Diffuse-Reflectance Spectroscopy (UV−Vis DRS). The incorporation of Co2+ into the ZnAl LDH sheets as CrO6 octahedron forms a new energy level which contributes for the excitation of electrons under visible light. The doped Co2+ at a reasonable content also serves as photo-generated charges separator and improves the visible light photocatalytic activity of ZnAl LDH. A degradation mechanism based on the hydroxyl radical as the active species was proposed. Copyright © 2018 BCREC Group. All rights reservedReceived: 3rd February 2018; Revised: 8th July 2018; Accepted: 13rd July 2018How to Cite: Li, D., Fan, L., Qi, M., Shen, Y., Liu, D., Li, S. (2018). Enhanced Visible-Light-Driven Photocatalytic Activity of ZnAl Layered Double Hydroxide by Incorporation of Co2+. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (3): 502-511 (doi:10.9767/bcrec.13.3.2168.502-511)Permalink/DOI: https://doi.org/10.9767/bcrec.13.3.2168.502-511

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Controlled leaching with prolonged activity for Co–LDH supported catalyst during treatment of organic dyes using bicarbonate activation of hydrogen peroxide

Cited by 88 publications

References 46 publications

Degradation of Phenol Using Peroxymonosulfate Activated by a High Efficiency and Stable CoMgAl-LDH Catalyst

Degradation of Phenol Using Peroxymonosulfate Activated by a High Efficiency and Stable CoMgAl-LDH Catalyst

Research progress of LDHs as Fenton reaction catalysts

Enhanced Visible-Light-Driven Photocatalytic Activity of ZnAl Layered Double Hydroxide by Incorporation of Co2+

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