Journal of Water Process Engineering
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2023
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IF 7
Hao Wang,Haibo Liu,Ziyang Chu,Fuwei Sun,Xuehua Zou,Qiang Wang,Tianhu Chen,Dong Chen,Hanlin Wang
This study showcases the performance of Fe 3 O 4 (S600) derived from the decomposition of siderite in activating peroxymonosulfate (PMS) for the 2,4-dichlorophenol (2,4-DCP) degradation, as well as the enhancement of visible light in the S600/PMS system. With the involvement of visible light, 2 g/L Fe 3 O 4 and 0.5 mM PMS achieved 100 % degradation of 2,4-DCP within 70 min. Singlet oxygen ( 1 O 2 ) and hydroxyl radicals ( OH) were the primary reactive species responsible for 2,4-DCP degradation under visible light irradiation based on the scavenging experiments and electron paramagnetic resonance (EPR) analysis. Importantly, compared to the absence of visible light, the visible light boosted 1 O 2 production and accelerated 2,4-DCP degradation. The effects of various operating parameters on the degradation efficiency were also examined, and the intermediates and possible degradation pathways of 2,4-DCP were identified. This study proves that the integrated utilization of natural siderite derivatives to activate oxidants for pollutant degradation is a promising approach.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Bin Yang,Wanzhong Yin,Jin Yao,Qiuyue Sheng,Zhanglei Zhu
This investigation focused on the collection performance and sorption mechanisms of decaethoxylated stearylamine (DSA) applied as a new high-selectivity hornblende collector, to further extend the use of DSA for efficiently recovering siderite from hornblende. The collecting ability of DSA to both minerals was explored via a series of flotation experiments. Flotation results illustrated that in comparison with DDA, DSA displayed an excellent collection performance for the hornblende flotation, whereas it hardly collected siderite. With 0.18 mM DSA, siderite could be efficiently separated from hornblende at pH 6.30 through reverse flotation. The selective collection mechanisms of DSA for hornblende were uncovered via surface wettability, X-ray photoelectron spectroscopy (XPS), surface electrical properties, infrared spectrum (IR) characterizations, and molecular dynamics (MD) simulations. Contact angle detection indicated that DSA strengthened the surface hydrophobicity of hornblende instead of siderite, which promoted the strong collection of hornblende. Besides, surface electrical detection and IR analyses suggested that the intense DSA sorption toward the hornblende was due to the combination of electrostatic adsorption and hydrogen bonding interaction. It was demonstrated by XPS results that larger amounts of DSA were adsorbed onto hornblende than siderite, and the O sites of hornblende were involved in electrostatic attraction and hydrogen bonding interaction. Furthermore, MD simulations further revealed that compared with siderite, the intense adsorption of DSA on the hornblende was due to the hydrogen bond and electrostatic interactions between its amino group and the hornblende surface, as evidenced by a much smaller interaction distance and very negative electrostatic energy. Therefore, DSA can be utilized as an efficient collector for collecting hornblende to achieve the desiliconization of the siderite flotation.
研究领域:
矿物加工工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL GEOLOGY
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2021
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IF 4.015
Fuwei Sun,Haibo Liu,Ziyang Chu,Peixun Zhai,Tianhu Chen,Hanlin Wang,Xuehua Zou,Dong Chen
To investigate the effect of isomorphic substitution on siderite activation of hydrogen peroxide, different X-substituted siderite (X = Mn, Co, Ca, and Mg) was artificially synthesized and utilized to activate hydrogen peroxide (H 2 O 2 ) over a pH range from 5 to 9. The results indicated that the addition of siderite generally accelerated the conversion process of H 2 O 2 to ·OH regardless of initial pH values. However, the conversion ability from H 2 O 2 to ·OH was only enhanced under the acidic condition. Then, X-substituted siderite generally enhanced the conversion rate and inhibited the capacity of H 2 O 2 to ·OH under neutral and alkaline conditions. The Mn, Ca, and Mg-substituted siderite facilitated both conversion rate and capacity of H 2 O 2 to ·OH under weakly acidic conditions, while Co-substituted siderite inhibited both compared to the raw siderite. The element substitution mainly affected the stability of siderite, which resulted in the dissolution of siderite to generate Fe 2+ and contributes to the H 2 O 2 decomposition and the ·OH generation. Findings from this research suggested that the isomorphic substitution of siderite had a non-negligible impact on the transformation of H 2 O 2 to ·OH.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Fuwei Sun,Haibo Liu,Hanlin Wang,Daobing Shu,Tianhu Chen,Xuehua Zou,Fangju Huang,Dong Chen
Natural iron-bearing minerals have been proven to be effective for activating H 2 O 2 to produce OH, which can be used to degrade organic pollutants . In this study, the performance of siderite to degrade sodium sulfadiazine via catalytic H 2 O 2 degradation was investigated at different solution pH values from 3 to 9. An interesting discovery was made: the performance of the siderite-H 2 O 2 system was excellent under acidic, neutral, and even alkaline conditions. The influence of various factors (e.g. initial concentration, anions, natural organic matters, etc.) on the system under different pH conditions was investigated, which confirmed that siderite exhibited an excellent catalytic performance. By combining EPR characterization with scavenger research, it was proposed that dissolved iron (Fe 2+ ) mainly initiated the homogenous Fenton reaction to degrade pollutants under acidic conditions, while structural Fe 2+ species present in siderite triggered Fenton-like reactions under neutral or even alkaline conditions. From the SEM and XPS characterizations, oxidation and dissolution of Fe 2+ on the surface were also observed, confirming our inference concerning the different reaction mechanisms. The experimental findings show that this siderite-H 2 O 2 system can be used in solutions with pH values from 3 to 9 and that siderite plays a positive role in soil and groundwater remediation when H 2 O 2 is used as an oxidant.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）