ENVIRONMENTAL TECHNOLOGY
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2024
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IF 2.2
Liping Wei,Kexin Zhou,Hui-qiang Li,Ping Yang,Baicang Liu
Most of the materials studied as catalysts in the electro-Fenton system are variants of iron oxide or iron hydroxide. However, iron-based catalysts often exhibit weak catalytic capabilities under neutral and alkaline conditions. In this work, we synthesized three cobalt based bimetallic oxides, Co2CuOx, Co2AlOx, and Co2NiOx, using hydrothermal method and evaluated them as catalysts for the heterogeneous electro-Fenton system to remove 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) and Methylisothiazolinone [2-methyl-4-isothiazolin-3-one] (MIT). Co2NiOx has the highest catalytic degradation activity for HEDP, and Co2CuOx has the best catalytic degradation effect for MIT. Based on characterization results of the catalysts, the reasons for the differences in the pollutant removal efficiency were analysed, and the optimal pH for the three cobalt based oxides to remove HEDP and MIT was investigated. The results showed that the optimal pH values of the three cobalt based bimetallic oxides are not only influenced by the second metal type, but also by the properties of pollutants. Therefore, suitable cobalt based catalysts can be selected based on the different properties of pollutants, or the composition of cobalt based catalysts can be adjusted to meet the different pH requirements of target wastewater. The three cobalt based bimetallic oxides exhibited good degradation of HEDP and MIT under neutral conditions, which to some extent solved the problem of narrow pH range in the practical application of the electro-Fenton process.
研究领域:
环境科学
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催化材料
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ruiyuan Jia,Xiaomeng Yu,Wenhui Wang,Kemeng Du,Yuru Liu,Yufei Wang,Wenjun Wu,Jin Guo
A lanthanum-modified polyethersulfone composite membrane (La-PES) loaded with nitrogen-doped carbon nanotubes (NCNT@La-PES) was successfully fabricated in this study. The NCNT@La-PES membrane could activate PMS, which enabled the degradation of phosphonate to phosphate, while also possessing the capability for adsorptive recycling of phosphorus. During the processing of 10.31 mg/L 1-hydroxyethane-1,1-diphosphonic acid (HEDP) in the NCNT@La-PES / PMS system, the removal efficiency of HEDP achieved 100 %, and almost 78 % of total phosphate (TP) in HEDP was transformed into phosphate, which were further adsorptive recycled by the La-PES membrane. The NCNT@La-PES/PMS system demonstrated exceptional performance across a broad pH range (4–10), with complete removal of HEDP and adsorption recovery of 73 % transformed phosphate. The decrease in pH caused by catalytic reaction reduced the hindrance of the alkaline environment to phosphate adsorption. The NCNT, acting as a catalyst, facilitated the formation of surface-bound radicals upon PMS activation, playing a pivotal role in the degradation of HEDP. The adsorption of phosphate by La-PES was primarily attributed to the ligand exchange between La(OH) 3 and phosphate. Moreover, NCNT@La-PES/PMS system showed significant catalytic and adsorption performance in consecutive cyclic treatment of HEDP in actual water, indicating its potential in practical application.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 7
·628-638
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IF 2.172
Qian Rao,Dandan Lv,Hui-qiang Li,Qin Long
The increasing of 1-hydroxy-1,1-diphosphonoethane (HEDP) in aquatic environments poses potential harm to the environment. Herein, the materials that silver nanoparticles/nanowires (Ag NPs/Ag NWs) and Fe3O4-decorated CoAl-layered double hydroxides (LDHs-Ag NPs@Fe3O4 and LDHs-Ag NWs@Fe3O4) were synthesized and applied to the degradation of HEDP in three-dimensional electro-Fenton system. Addition of Ag-doped LDHs@Fe3O4 particles greatly increased the HEDP removal rate compared with the addition of LDHs@Fe3O4 particles. The HEDP degradation rates using LDHs-Ag NPs@Fe3O4 and LDHs-Ag NWs@Fe3O4 particles were 73.34% and 79.64%. Furthermore, based on the characterization of synthesized particles, generation of free radical and H2O2, a possible mechanism of improved oxidation performance by the LDHs-Ag NWs@Fe3O4 particles was elucidated. The LDHs-Ag NWs@Fe3O4 particles possessed excellent stability and reusability, as evidenced by the stable degradation activity of 70.53% for HEDP degradation after four successive runs.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Hui-qiang Li,Mei-yu Zhang,Ke-xin Zhou,Ping Yang,Zhi-wei Gan,Zhi Li
s Iron-based catalysts are widely used in the electro-Fenton technology, which are limited by strict acidic conditions. Cobalt-based catalysts can undergo Fenton-like reactions with H 2 O 2 under neutral conditions. In this study, a CF@Co 2 NiO x @MgAl-LDH cobalt-based bimetallic catalyst was prepared to study 1-hydroxyethylidene-1 (HEDP) and methylisothiazolinone (MIT) degradation performance in a heterogeneous electro-Fenton system. Cobalt-based bimetallic oxides were first modified with magnesium-aluminum hydrotalcite (MgAl-LDH) and subsequently loaded onto carbon felts (CF) to reduce metal ion leaching and improve catalyst recyclability. The experimental results showed that CF@Co 2 NiO x @MgAl-LDH could effectively remove 93.06% of HEDP and 92.42% of MIT after 2 hours of reaction. Removal of HEDP and MIT was still achieved at 78.62% and 81.09% after four cycles of experiments. Based on the catalyst characterization results, the reasons for the differences in the pollutant removal performance were analyzed and the optimal operating parameters of the CF@Co 2 NiO x @MgAl-LDH for the removal of HEDP and MIT were investigated. This study provides a novel and sustainable strategy for the design and application of cobalt-based catalysts.
研究领域:
环境化学
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催化科学
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水污染控制
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材料化学
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环境工程
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应用电化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）