CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Shengnan Chen,Jing Deng,Cheng Ye,Chengcheng Xu,Lingyi Huai,Xiao Ling,Jun Li,Xueyan Li
Pre-magnetized Fe 0 /persulfate (pre-Fe 0 /PS) process was innovatively employed for controlling the pollution of p -arsanilic acid ( p -ASA). This process showed favorable removal performance, achieving almost complete elimination of 10 mg/L p -ASA within 30 min at the reaction conditions of 0.2 g/L pre-Fe 0 and 1 mM PS. The increase of PS concentration and pre-Fe 0 dosage was conducive to the degradation. The coexistence of Cl − , NO 3 − and SO 4 2− accelerated the removal, however the presence of HCO 3 − and HA presented the opposite trend. The p -ASA degradation decelerated gradually with increasing pH from 5 to 9. Its removal was caused by the attack of reactive oxygen species (i.e., SO 4 − , OH, O 2 − ), which could be continuously formed via the Fe 2+ /Fe 3+ cycle in solution and on pre-Fe 0 surface. In pre-Fe 0 /PS system, SO 4 − in solution, surface-bound SO 4 − , OH, OH in solution, O 2 − in solution and Fe(IV) contributed to the p -ASA degradation. A plausible transformation route related to the break of C-N and As-C bonds, the substitution of OH group was put forward. More importantly, the released inorganic arsenic during p -ASA decomposition could be effectively controlled through multiple functions including the precipitation, co-precipitation and sorption, which was well confirmed by XPS, FTIR and XRD analysis. Pre-Fe 0 /PS and Fe 0 /PS pretreatments both reduced the generation of C-DBPs except for chloral hydrate, while increased the formation of N-DBPs except for trichloroacetamide.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Yuwei Pan,Minghua Zhou,Ying Zhang,Jingju Cai,Bing Li,Xuejie Sheng
An efficient heterogeneous catalyst, pre-magnetized Fe 0 (pre-Fe 0 ) could significantly activate persulfate (PS) to remove Rhodamine B (RhB). The effect of pH, Fe 0 and PS dose on the RhB removal in the pre-Fe 0 /PS and Fe 0 /PS processes were investigated, and optimized by response surface methodology (RSM) to analyze the rate constants of the RhB removal in the pre-Fe 0 /PS process and Fe 0 /PS process ( f ). High RhB removal was obtained at low pH and high dose of Fe 0 and PS in both systems. Low Fe 0 and high PS dose and large pH would result in big value of f , and the simulated maximum f of 44.3 was achieved at 2 mM Fe 0 , 16 mM PS and pH 9. The synergetic factor of pre-Fe 0 /PS (45.6) was larger than that of Fe 0 /PS (21.4). The pre-Fe 0 /PS process presented 2.1–37.5 folds enhancement than the Fe 0 /PS process for the degradation of RhB. The RhB removal in the pre-Fe 0 /PS process was 1.5–11.2 folds enhancement than that of the Fe 0 /PS process in the presence of different anions and cations. Scanning Electron Microscope (SEM) results and the larger intensity of DMPO-SO 4 − adduct signal in the Electron Paramagnetic Resonance (EPR) confirmed the primary role of sulfate radicals generated from the reaction of PS with Fe 0 in the contaminant degradation. The pre-Fe 0 /PS process exhibited advantages over other processes to remove RhB in terms of contaminant removal, working pH range and chemical dose. Therefore, the pre-Fe 0 /PS process is a cost-effective approach for degrading RhB.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Xiang Li,Minghua Zhou,Yuwei Pan,Liting Xu,Zhuoxuan Tang
Advanced oxidation processes (AOPs) has great potential for wastewater treatment, but still limited in application due to their high cost for extensive reagent and energy demand, and restricted working conditions (e.g. narrow pH range). Here, AOPs based on pre-magnetization Fe 0 (Pre-Fe 0 ) were found to be highly efficient at wider pH conditions, partly solved the above problems. After pre-magnetization, Fe 0 was supposed to be easier to be corroded, which remarkably improved processes (e.g., Pre-Fe 0 /H 2 O 2 , Pre-Fe 0 /K 2 S 2 O 8 ) efficiency several to >100 folds and valid for many refractory contaminants (e.g. dyes, phenols, organic acids), compared with that conventional processes without pre-magnetization. Moreover, the process efficiency could be sustained by the recovery of magnetism of Pre-Fe 0 . Thus AOPs based on pre-Fe 0 is more promising to take place of conventional Fe 0 based AOPs since it is more efficient but does not require any change of the present water and wastewater treatment process, and does not need an extra energy source, costly materials, and complex equipment.
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
CHEMOSPHERE
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2018
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IF 4.427
Xiang Li,Minghua Zhou,Yuwei Pan
Diclofenac sodium (DCF) is frequently detected as a non-steroidal pharmaceutical in the aquatic environment. In this study, the degradation of DCF in two heterogeneous systems, pre-magnetization Fe 0 /H 2 O 2 (Pre-Fe 0 /H 2 O 2 ) and Fe 0 /H 2 O 2 system, was comparably studied. Our findings proved that Pre-Fe 0 could significantly improve the degradation and dechlorination of DCF due to the change of Fe 0 characteristics after pre-magnetization. Compared with Fe 0 /H 2 O 2 process, Pre-Fe 0 /H 2 O 2 process has 2.1–7.0 times higher rate constant for DCF degradation at different H 2 O 2 dosages (0.25–2.0 mM), initial pH (3.0–6.0) and Fe 0 dosages (0.25–1.5 mM). The characterizations by X-ray Photoelectron Spectroscopy and Electron Paramagnetic Resonance confirmed that the enhancement attributed to the increase of Fe 0 corrosion and fast generation of OH . In addition, preliminary degradation mechanism was elucidated by major products identification using UPLC-MS, through which the degradation intermediates, such as 4-hydroxy-diclofenac or 5-hydroxydiclofenac, 2,6-dichloroaniline, phenylacetic acid, 1,3-dichlorobenzene and 2-aminophenylacetic acid were identified. Hydroxylation, decarboxylation , C N bond cleavage and ring-opening involving the attack of OH or other substances, were the main degradation mechanism. Therefore, Pre-Fe 0 /H 2 O 2 process, which does not need extra energy and costly reagents, is an efficient and environmental-friendly process to degrade DCF.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2016
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IF 3.299
Yuwei Pan,Minghua Zhou,Xiang Li,Liting Xu,Zhuoxuan Tang,Mengmeng Liu
A new modified Fenton-like process (pre-magnetization Fe 0 /H 2 O 2 ) was employed to enhance the degradation of organic pollutants and reduce reagents dosage, using azo dye of tartrazine as the model. Compared with Fe 0 /H 2 O 2 process, pre-magnetization Fe 0 /H 2 O 2 process could have 1.3–11.2 folds enhancement in the degradation rate of tartrazine at different Fe 0 dosages (0.5–4 mmol), initial pH levels (2–6.5) and H 2 O 2 dosages (0.25–2 mmol) owing to the change of Fe 0 characteristics after pre-magnetization. The contact angle of pre-magnetization Fe 0 decreased from 58.4° to 19.8° enhancing the hydrophilicity and BET increased from 0.15 m 2 /g to 1.94 m 2 /g, which improved the corrosion of Fe 0 and accelerated the generation of Fe 2+ . Similar to the case of tartrazine, pre-magnetization Fe 0 /H 2 O 2 process had remarkable improvement on many refractory contaminants. The degradation rate constant of methyl orange, orange, methylene blue, 2,4-dichlorophenol (2,4-DCP), acetylsalicylic acid, phenol and tetracycline by pre-magnetization Fe 0 /H 2 O 2 process was 5.2, 21.3, 9.2, 5.6, 12.3, 9.5 and 3 folds of that by Fe 0 /H 2 O 2 process, respectively. The “magnetic memory” of pre-magnetization Fe 0 could last 24 h which was suitable for off-site application, and the lost some or all “magnetic memory” could be recovered after second pre-magnetization. Pre-magnetization Fe 0 /H 2 O 2 is a more promising and highly efficient Fenton process since it does not require any change of the present water and wastewater treatment process , and does not need an extra energy source and complex equipment but can widen pH range and save more than 75% Fe 0 and H 2 O 2 dosages.
研究领域:
环境科学
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化学工程
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废水处理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Yuwei Pan,Minghua Zhou,Xiang Li,Liting Xu,Zhuoxuan Tang,Xuejie Sheng,Bing Li
Highly efficient persulfate oxidation process activated with pre-magnetization Fe 0 (pre-magnetization Fe 0 /PS) was employed to degrade Orange anthraquinone dye at different Fe 0 dosages (1–8 mmol/L), initial pH levels (3–10) and PS dosages (2–8 mmol/L). Pre-magnetization Fe 0 /PS possessed 8.4–119.6 folds enhancement in degradation rate and could widen pH range and save 90% Fe 0 and PS dosage when compared with conventional Fe 0 /PS process. And this effect was ascribed to the change of Fe 0 characteristics after pre-magnetization. This significant improvement was also observed on the degradation of many refractory contaminants of tartrazine, phenol, 2,4-dichlorophenol (2,4-DCP), p -chlorophenol, chlorobenzene, nitrobenzene, p -nitrophenol and p -nitrchlorobenzene, which were 2.8–11.4 folds of those by Fe 0 /PS process. Pre-magnetization Fe 0 /PS is a more promising process since it does not require any change of the present water and wastewater treatment process, and does not need an extra energy source, costly materials, and complex equipment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）