ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Weijie Hua,Yong Kang,Huixin Yuan
The effective and rapid treatment of emerging pollutants in water is an essential solution to the pollution of water environment. The emerging pollutant-malachite green (MG) wastewater was treated using pulsed discharge plasma on water surface system (WSP) combining Fe 2+ /PMS. Compared with WSP alone, the addition of 125 μM Fe 2+ and 0.5 mM peroxymonosulfate (PMS) in WSP could enhance the degradation efficiency and energy efficiency of MG by 32.8% and 9.7% respectively, with the synergistic factor of up to 2.056. UV–Vis absorption spectra and mineralization further demonstrated the synergistic effect. When the peak voltage and air flow rate were 22 kV and 0.7 L/min, the degradation efficiency and kinetic constant of MG could reach 97.9% and 0.259 min −1 , respectively. MG degradation with high conductivity (1000 μS/cm) by WSP + Fe 2+ /PMS not only exhibited the better purification effect, but also could maintain the faster reaction rate. The active species involved in the degradation of MG in WSP + Fe 2+ /PMS system were mainly ·OH, SO 4 · − , O 2 · − and e* − . Furthermore, H 2 O 2 and O 3 also have a certain oxidizing effect on MG. Cl − , SO 4 2− , HCO 3 − and humic acid (HA) could inhibit MG degradation to some extent, but still removed more than 80% of MG in water. The WSP + Fe 2+ /PMS reaction system was suitable for the treatment of other emerging pollutants in water. The results of LC-MS analysis revealed that the N-demethylation reaction and decomposition of conjugated structure were the important pathways for MG degradation. The H 2 O 2 and acidic liquid environment provided by WSP laid the foundation for the formation of Fenton, and the introduced Fe 2+ could fully undergo the Fenton and activation reaction with H 2 O 2 and a small amount of PMS in the liquid phase, which enhanced the generation of active species, especially · OH.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 32
·49267-49278
·
IF 5.19
Peng Huan,Chen Rong,Tao Ningyao,Xiao Yangyi,Li Chenxing,Zhang Tuqiao,Ye Miaomiao
Activation of peroxymonosulfate (PMS) by Fe 2+ is a green oxidation process for degradation of organic contaminants. However, the formation of iron mud and low PMS utilization lead to the decreased oxidation efficiency. In this work, commercial MoS 2 particles were used as the catalyst for boosting the Fe 2+ /PMS process for carbamazepine (CBZ) removal. The CBZ removal efficiency by the MoS 2 /Fe 2+ /PMS process was significantly enhanced, increasing to 6.5 times that of the Fe 2+ /PMS process. The Fe 3+ was reduced to Fe 2+ by the exposed Mo 4+ on the surface of MoS 2 , leading to the enhanced PMS utilization rate and increased Fe 2+ concentration. The relative intensity of DMPO-HO• and DMPO- SO 4 – • followed the order of MoS 2 /PMS < Fe 2+ /PMS < MoS 2 /Fe 2+ /PMS, also suggesting the enhanced oxidation activity with the addition of MoS 2 in the process of Fe 2+ /PMS. The commercial MoS 2 had good stability shown by the CBZ removal efficiency remaining almost unchanged during 8-time cycling use. Finally, a possible CBZ degradation pathway was proposed for helping understand the oxidation mechanism of the MoS 2 /Fe 2+ /PMS process.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 14
·4524
·
IF 4.927
Tingting Wu,Huan Peng,Xiaowei Liu,Ruijin Wu
Carbamazepine (CBZ), as a typical pharmaceutical and personal care product (PPCP), cannot be efficiently removed by the conventional drinking water and wastewater treatment process. In this work, the CoS2/Fe2+/PMS process was applied for efficient elimination of CBZ. The CBZ removal efficiency of CoS2/Fe2+/PMS was 2.5 times and 23 times higher than that of CoS2/PMS and Fe2+/PMS, respectively. The intensity of DMPO-HO• and DMPO-SO4•−followed the order of Fe2+/PMS < CoS2/PMS < CoS2/Fe2+/PMS, also suggesting the CoS2/Fe2+/PMS process has the highest oxidation activity. The effects of reaction conditions (e.g., CoS2dosage, Fe2+concentration, PMS concentration, initial CBZ concentration, pH, temperature) and water quality parameters (e.g.,SO42−,NO3−,H2PO4−,Cl−,NH4+, humic acid) on the degradation of CBZ were also studied. Response surface methodology analysis was carried out to obtain the best conditions for the removal of CBZ, which are: Fe2+= 70 µmol/L, PMS = 240 µmol/L, CoS2= 0.59 g/L. The sustainability test demonstrated that the repeated use of CoS2for 8 successive cycles resulted in little function decrease (<10%). These findings suggest that CoS2/Fe2+/PMS may be a promising method for advanced treatment of tailwater from sewage treatment plant.Keywords:cobalt disulfide;persulfate;carbamazepine;advanced oxidation process
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yu-qiong Gao,Yan-yan Rao,Han Ning,Ju-xiang Chen,Qian Zeng,Fu-xiang Tian,Nai-yun Gao
The degradation of diclofenac (DCF), a commonly used nonsteroidal anti-inflammatory drug, by Fe 2+ /chlorine and Fe 2+ /PMS processes was comparatively investigated. The influencing factors of pH, Fe 2+ and oxidant dosage on DCF degradation efficiency were evaluated and optimized. Typically, with an initial solution pH of 5, an Fe 2+ dosage of 70 μM, and a chlorine or PMS dosage of 70 μM, the degradation efficiency of DCF using the Fe 2+ /chlorine and Fe 2+ /PMS processes reached 94.2% and 79.7%, respectively, within 10 min. Quenching tests indicated the coexistence of •OH and RCS in the Fe 2+ /chlorine system, and both SO 4 ●– and •OH were identified in the Fe 2+ /PMS system. In addition, Fe(IV) was also identified to participate in DCF degradation in two systems based on the oxidation of PMSO to PMSO 2 . The degradation products and pathways of DCF were elucidated by LC/TOF/MS analysis and DFT calculations. It was assumed that the degradation pathway of DCF involves hydroxylation, dechlorination, decarboxylation, cleavage of the C-N bond, and chlorine substitution. In addition, trichloromethane (TCM), dichloroacetaldehyde (DCAL), dichloroacetonitrile (DCAN) and trichloronitromethane (TCNM) were also detected in the Fe 2+ /chlorine process, and these chlorinated DBPs initially increased and then decreased with prolonged reaction time, indicating that Fe 2+ /chlorine is capable of controlling DBPs formation. Finally, the acute and chronic toxicity of DCF and its degradation products were evaluated by the ECOSAR program.
研究领域:
环境科学
·
化学工程
·
毒理学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Jingsong Ming,Wei Chen,Zhiyi Zhu,Guangliang Chen,Shupeng Zhao,Fei Gong,Jun Huang
Cefixime (CFX), a widely used antibiotic, has become a challenge for the treatment of antibiotic pollution in water bodies. In this study, the performance and mechanism of microbubbling plasma (MBP) combined with ferrous ions (Fe 2+ ) to activate peroxymonosulfate (PMS) and peroxodisulfate (PDS) in degrading CFX were compared. The effects of the dosages of PMS/PDS and Fe 2+ , plasma discharge voltage, and gas flow rate on the degradation efficiency were investigated systematically. Under optimal conditions, the degradation rate of CFX reached 90.75 %, which was significantly higher than that of MBP alone (a 27.81 % increase) and the MBP/PDS system (a 23.76 % increase), indicating a high degree of synergy among MBP, Fe 2+ , and PMS. The energy efficiency of this system was as high as 1.95 g/kWh. Ultraviolet–visible spectroscopy and total organic carbon analysis indicated that the addition of PMS and Fe 2+ promoted the degradation and mineralization of CFX. The detection of reactive oxygen and nitrogen species combined with radical scavenging experiments confirmed that singlet oxygen ( 1 O 2 ), hydroxyl radicals (·OH) and sulfate radicals (SO 4 · − ) were the most important active species in the degradation process. Based on the results of a liquid-chromatography–mass-spectrometry analysis, three main CFX degradation pathways were identified. In addition, the toxicities of CFX and its degradation intermediates were evaluated using toxicity assessment software. This study provides a new plasma-based method for the degradation of CFX, which has value as a reference for the future treatment of antibiotic-polluted water bodies.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2026
·Vol. 37
·期 7
·105314
·
IF 4.5
Lin Li,Kaiyun Yang,Zhan Ding,Chang Liu
Spodumene is often associated with albite, and their similar physicochemical properties render conventional collectors ineffective for achieving selective flotation separation. This study introduces a Fe 2+ /PMS Fenton-like system to selectively enhance the adsorption of NaOL onto the spodumene surface, thereby enlarging the floatability difference between the two minerals and enabling their separation. Single-mineral flotation tests demonstrated that under optimal conditions (pH 9, NaOL dosage 8 × 10 -4 mol/L, and Fe 2+ /PMS dosage 2 × 10 -4 mol/L with a Fe 2+ :PMS molar ratio of 1:3), the recoveries of spodumene and albite were 92.37% and 8.64%, respectively. Flotation experiments on an artificial mixed mineral (spodumene:albite = 1:3) yielded a spodumene concentrate with a Li 2 O grade of 6.73% and a recovery of 88.17%. The separation mechanism was elucidated through contact angle measurements, atomic force microscopy (AFM), zeta potential analysis, electron paramagnetic resonance (EPR), and X-ray photoelectron spectroscopy (XPS). The results indicate that the Fe 2+ /PMS system selectively generates reactive oxygen species (SO 4 • − and •OH) on the spodumene surface. These species oxidize Fe 2+ to Fe 3+ , leading to the adsorption of more Fe 3+ species on spodumene which subsequently act as active sites for oleate anion adsorption. In contrast, the system exhibited a comparatively minor effect on the albite surface. This work provides a novel reagent approach and a theoretical foundation for the flotation separation of spodumene from albite.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）