CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Yajie Qian,Xuefei Zhou,Yalei Zhang,Peizhe Sun,Weixian Zhang,Jiabin Chen,Xin Guo,Xiao Zhang
Calcium peroxide (CP) combined persulfate (PS) oxidation is an emerging in situ chemical oxidation (ISCO) technology for ground water remediation. Many field cases also confirm its effectiveness in ground water remediation while few research articles document it. This study investigated the performance of α-methylnaphthalene (MN) degradation by PS/CP to further understand this dual oxidant application in ISCO. Results showed that MN could be completely oxidized in 72 h with 1 g L −1 PS and 1 g L −1 CP. The degradation rates of MN increased with the increase of PS and CP concentration. MN degradation was significantly enhanced with the solution pH decrease, because CP was easier to dissolve and generated more radicals in acidic condition. Solutes in ground water including chloride ions, alkalinity and natural organic matters presented inhibitory effect on MN degradation in this dual oxidant system. Plausible mechanisms of the sulfate and hydroxyl radicals in the system were proposed based on the results of radical scavenging experiments and electron spin resonance (ESR) tests. It appeared that surface OH of CP was also responsible for the MN removal. The major oxidation products in this study were 1-naphthaldehdye, naphthalene-1-ylmethanol and 4-hydroxy-4-methylnaphthalen-1(4H)-one. To better understand PS/CP in ISCO, the degradation of MN was tested in ground water matrix, which showed satisfactory efficiency. The results of this study provided some detail information of PS/CP dual oxidant in degradation organic contaminants, which might provide some references for the application of this technology in ISCO.
研究领域:
环境工程
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环境化学
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污染控制
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土壤与地下水修复
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高级氧化技术
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
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2019
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IF 5.108
Shoufeng Tang,Na Li,Deling Yuan,Jiachen Tang,Xue Li,Chen Zhang,Yandi Rao
Introducing peroxymonosulfate (PMS) and peroxydisulfate (PDS) into the photocatalytic fuel cell (PFC) system were investigated by comparing the Reactive Brilliant Blue (KN-R) degradation and synchronous electricity production. The two persulfates (PS) themselves are strong oxidant , and could be activated and as electron sacrificial agent in the PFCs, facilitating the photoelectrocatalysis and expanding redox to the entire cell space. Hence, the two established PFC/PS systems manifested prominent cell performances, enhancing the KN-R decomposition and electric power production relative to the virgin PFC. Thereinto, the KN-R removal rate of PFC/PMS was faster than that of PFC/PDS, but an opposite trend appeared in the electricity generation. Besides, the cell performances of the two cooperative systems were evaluated at different operation conditions, including PS dosage, solution pH, and irradiation strength . Moreover, the dye elimination principle was explored by radicals scavenging experiment, and the consequence revealed that hydroxyl radical (HO • ), sulfate radical (SO 4 • ˉ) and singlet oxygen were chief active species in the PFC/PMS, and HO • , SO 4 • ˉ and superoxide anion played the key roles in the PFC/PDS. Furthermore, the calculated economic indicator demonstrated that the economy of the two synergistic processes were greater than that of UV/PS and solo PFC, and the PFC/PDS was more cost-effective than PFC/PMS.
研究领域:
环境科学
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化学工程
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高级氧化技术
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能源材料
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光催化
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废水处理
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jing Ding,Qingwei Gao,Bingxin Cui,Qingliang Zhao,Guanshu Zhao,Shan Qiu,Lingjun Bu,Shiqing Zhou
Comparisons of solar-assisted electrooxidation process (SEOP), electrooxidation (EO), and solar photolysis have been addressed to evaluate the performance of bisphenol A (BPA) removal and mineralization. The results presented the BPA removal efficiency of 100% in SEOP was higher than that of 2.8% and 88% at 90 min in direct photolysis and EO process, respectively, indicating the synergistic effect of EO and solar light in SEOP. The investigation of corresponding active species indicated that ·OH and 1 O 2 played the predominant role in SEOP. The introduction of solar light in the EO process could promote the generation of ·OH, 1 O 2 , and SO 4 ·- and enhance the degradation performance, explaining the synergistic removal mechanism. The density functional theory (DFT) results pointed out the main active sites of BPA attacked by electrophilic reagent based on the calculation of the energy barrier, Fukui index, and molecular orbitals, etc. Taking into account of the identification of intermediates, the possible degradation pathways of BPA mainly included C-C bond cleavage, ring hydroxylation, and ketonization process. The effects of anode materials, illumination intensity, current density, and electrolyte for the degradation efficiency in SEOP were explored. These results exhibited that the efficient removal of BPA in SEOP was achieved with a relatively lower electricity consumption of 1.21 kWh·(m 3 ·order) -1 , which provided new insights into the synergistic mechanism and enhanced removal of contaminants.
研究领域:
环境科学
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化学工程
·
水处理技术
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高级氧化技术
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污染物降解
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理论化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yuwei Pan,Minghua Zhou,Jingju Cai,Xiang Li,Wei Wang,Bing Li,Xuejie Sheng,Zhuoxuan Tang
Nowadays, Fenton (Fe 2+ /H 2 O 2 ) process is increasingly applied to wastewater treatment, however, the treatment efficiency would be inhibited largely when treated salty wastewater. To overcome this limitation, pre-magnetization (pre-magn-Fe 0 )/H 2 O 2 process was investigated to treat salty wastewater, which could enhance the degradation rate of organic pollutants (1.2–171.2 folds enhancement) and reduce reagents dosage (save 75% H 2 O 2 ) in salty system compared with Fe 0 /H 2 O 2 process, using Orange G as the target pollutant and Na 2 SO 4 as the model salty system. The characterizations by SEM, XRD and XPS and the intensity of DMPO–OH adduct signals in different processes confirmed this enhancement attributed to the increase of corrosion of Fe 0 inducing fast catalysis of H 2 O 2 and generation of hydroxyl radicals. Pre-magn-Fe 0 /H 2 O 2 process could also have 5.9, 26.4 and 93.7 folds enhancement in NaCl, NaNO 3 and Na 2 HPO 4 salty system, respectively. Meanwhile, pre-magn-Fe 0 /H 2 O 2 process could keep close performance in Na 2 SO 4 and NaCl salty systems and have better performance in NaNO 3 and Na 2 HPO 4 salty systems than Fenton process. Pre-magn-Fe 0 /H 2 O 2 process also had remarkable improvement (1.1–5.3 folds) on the removal of many refractory contaminants in salty system. Furthermore, it could also keep good performance in real reverse osmosis concentrated wastewater and petrochemical wastewater. Therefore, pre-magn-Fe 0 /H 2 O 2 process is a more cost-effective process to treat salty wastewater, which could have not only improved performance than conventional system and Fe 0 /H 2 O 2 process, but also good performance as Fenton process.
研究领域:
环境工程
·
化学工程
·
水处理技术
·
高级氧化技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2011
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IF 2.072
Wenzhen Li,Shuguang Lu,Zhaofu Qiu,Kuangfei Lin
The performance of clofibric acid (CA) degradation in Milli-Q water and wastewater treatment plant (WWTP) effluent by solar/TiO2 and solar/ZnO was investigated in summer and winter seasons. The effects of NO3− and HCO3− anions, humic acid (HA), and H2O2 on CA photocatalysis were evaluated. Significant difference in CA degradation in two seasons was observed. Both NO3− and HCO3− anions adversely affected CA degradation, particularly at high HCO3− concentration. CA degradation slightly increased with 0.5 mg L−1 HA in solar/TiO2 in summer, but was significantly inhibited in winter at 20 mg L−1 HA. However, the inhibitive effect of 20 mg L−1 HA on CA removal in solar/ZnO had no remarkable difference in two seasons. The degradation in solar/TiO2/H2O2 was similar to that in solar/TiO2, but was inhibited obviously in solar/ZnO/H2O2. When applying photocatalytic process into WWTP effluent, degradation rates were apparently lower compared to Milli-Q water and temperature caused a great adverse effect on CA elimination.
研究领域:
环境科学
·
光催化
·
水处理
·
高级氧化技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Qiang Bi,Yilin Zhao,Bo Yang,Yue Du,Ying Xue,Kun Zhang,Juanqin Xue
The abuse of antibiotics has caused serious harm to the ecological environment and human health. Fenton-like advanced oxidation technology is a green and effective treatment means, but how to improve the Fenton reaction efficiency and wide pH adaptability is still a big challenge. Herein, we designed and developed a single-atom catalyst Cu 1 -CN with graphite-phase carbon nitride as the carrier by loading a low amount of metal Cu. The N atom anchors the copper atom in the form of a coordination bond, and the single atom Cu site has excellent performance in activating H 2 O 2 . Not only a short period of time (10 min) oxidation degradation of tetracycline (degradation rate 80 %), and in a broad range of pH (3.2 ∼ 9.5) still maintaining high removal performance (efficiency more than 70 %). Combined with X-ray absorption fine structure characterization and density functional theory (DFT) calculations, it is considered that isolated Cu atom and N atom cooperate to construct highly reactive Cu-N 4 active centre, which completes the task of H 2 O 2 activation. This study provides a new theoretical basis and technical support for the degradation of antibiotic pollutants by single-atom Fenton-like reaction.
研究领域:
环境科学
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催化化学
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高级氧化技术
·
材料化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）