Catalysts
·
2024
·Vol. 14
·期 12
·892
·
IF 3.8
Yangzhou Deng,Yuqi Zhang,Kunkun Wei,Yue Wang,Shihui Zou,Juanjuan Liu
Advanced oxidation catalyzed by metal oxides is a promising approach for degrading organic pollutants in wastewater. A critical strategy to enhance the performance of these catalysts is optimizing the dispersion of their active components through innovative synthesis methods. In this study, we report a one-pot synthesis of g-C3N4nanomeshes supported with highly dispersed VO2catalysts (V-g-C3N4) for the advanced oxidation of methylene blue (MB). The characterization results reveal that the involvement of VCl3in the pyrolysis of melamine facilitates the formation of g-C3N4nanomeshes with abundant amino groups (NH/NH2). The strong interaction between vanadia species and amino groups prevents VO2particles from agglomerating, resulting in a significantly higher vanadia dispersion than V-g-C3N4-im synthesized via the traditional impregnation method. V-g-C3N4exhibits a sophisticated microstructure and surface structure, which leads to a rate constant 2.3-fold higher than V-g-C3N4-im in the catalytic degradation of methylene blue using H2O2as the oxidant. X-ray photoelectron spectroscopy, trapping experiments, and electron paramagnetic resonance measurements reveal that the rapid adsorption and fast diffusion of MB over g-C3N4nanomeshes, together with the efficient H2O2activation into ·OH radicals via the V4+/V5+redox cycle, synergistically contribute to the superior MB removal efficiency of V-g-C3N4. Moreover, V-g-C3N4demonstrates no significant decrease in activity even after the fourth cycle, indicating its excellent stability during the pollutant removal process.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yulu Zhang,Jiping Jia,Nanxin Chang,Yuzeng Zhao,Xinjing Meng,Honghua Ge
The development of cheap and efficient catalysts for persulfate activation in advanced oxidation processes based on persulfate is important and promising in the wastewater treatment field. Herein, conductive carbon black loaded CuFe 2 O 4 (CCB-CuFe 2 O 4 ) had been prepared via a sol-gel method and was used as a catalyst to activate persulfate for the removal of phenol in water. The CCB-CuFe 2 O 4 was characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer–Emmett–Teller, and Raman spectroscopy, which confirmed that CuFe 2 O 4 nucleated on the defect of CCB. The performance of the activation on persulfate was studied by determining the concentration of phenol and chemical oxygen demand of the water. The activity of the catalyst is the highest when the content of CuFe 2 O 4 in the catalyst is 10%. The removal rate of 100 mg/L phenol reached 100% in 30 min under the optimized operation condition, which was 2.0 g/L CCB-CuFe 2 O 4 , 2.0 mmol/L persulfate (PS) and pH = 11. The factors of effect on the catalysis performance were discussed. CCB-CuFe 2 O 4 can be used in the pH range of 3~11 and the presence of HCO 3 – can promote phenol degradation rate. The use of CCB-CuFe 2 O 4 catalyst obviously reduced the dose of PS in the process of phenol oxidation degradation. Furtherly, quenching experiments verified that the most important reactive species in the CCB-CuFe 2 O 4 /PS/phenol system is singlet oxygen ( 1 O 2 ).
研究领域:
环境科学
·
催化化学
·
水处理技术
✓ 已验证
DOI
高影响因子
Advanced Sustainable Systems
·
2021
·Vol. 5
·期 5
·2000278
·
IF 6.271
Shaoan Cheng,Yihang Li,Zhen Yu,Yi Sun,Beichen Jin,Zhengzhong Mao
Freshwater shortages and water pollution have threatened the sustainable development of human beings. Efficient and sustainable technologies are urgently needed to achieve seawater desalination and wastewater treatment. Here, a hybrid device is developed consisting of photovoltaics (PV), membrane distillation (MD), and electrochemical advanced oxidation processes (EAOPs) for sustainable freshwater production and wastewater treatment. The device obtains freshwater from seawater with a stable rate of 0.97 kg m –2 h –1 under 1 sun, and the produced clean water reaches the drinking water limit of the WHO. This device also obtains freshwater from a methylene blue (MB) solution at a stable water production rate of 0.75 kg m –2 h –1 , and the concentrated MB solution demonstrates a degradation rate of 96.05% by in situ degradation of EAOPs. The high water-production performance and degradation performance is attributed to the well-designed structure of the three stages PV-MD-EAOPs device, which enables both the latent heat recycle of water evaporation and the contaminants enrichment of wastewater. To summarize, a new path is explored for in situ thermal and electricity utilization of photovoltaic for efficient treatment of wastewater, which is a meaningful way for synchronous clean water production and wastewater treatment.
研究领域:
环境科学
·
能源工程
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水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 8
·1-10
·
IF 2.5
Cui Wei,Fang Jiahui,Wan Yuanyuan,Tao Xueyu,Guo Litong,Feng Qiyan
In this study, Fe–N co-doped carbon nanotubes (Fe–N-CNTs) were prepared and used to activate peroxymonosulfate (PMS) for advanced oxidation removal of Rhodamine B (RhB). The XRD, XPS, SEM and EDS results revealed that the Fe, N, O co-doped carbon nanotubes (Fe–N-CNTS) coated with FeO(OH) nanosheets were successfully synthesized by a simple pyrolyzing process. The large BET specific surface area (286.42 m 2 /g) and hybrid pore structure of micropores and mesopores (3–10 nm) of the Fe–N-CNTS ensured its good RhB degradation performance (98% in 30 min) by activatting PMS. The Fe–N-CNTS-1.5 had the best degradation performance, which could be attributed to the synergy effect between FeO(OH) nanosheets and Fe–N-CNTS. The 1 O 2 , O 2 •, •OH and SO 4 −• were formed during the PMS activating process and involved in the RhB degradation. The reaction constant of 0.5483 min −1 could be obtained by adding 1.5 mM PMS, which is about 12 and 24 times of the reaction constant of PMS only (0.0458 min −1 ) and FeN-CNTS only (0.0226 min −1 ), respectively. This work provides new insight into the mechanism of PMS activation by carbon-based catalysts for the efficient degradation of RhB.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2021
·
IF 11.236
Tan Meng,Wenjun Sun,Xiao Su,Peizhe Sun
UV-based advanced oxidation processes (AOPs) via photolysis of precursor chemical oxidants have been of interest to numerous researchers over the past several decades due to their capacity to generate highly active radical species and interesting radical chemistry. However, applications of UV-based AOPs have been commonly optimized case by case, due to the lack of theoretical investigations on process optimization, especially on oxidant doses. In this study, a simple equation for UV/H 2 O 2 (•OH as the sole primary reactive species (PRS)) to obtain the theoretical optimal concentration ( C opt-theoretical ) for H 2 O 2 was derived ( C opt-theoretical = A b · S c ε · k ). The equation was then validated for its accuracy in the calculation of C opt-theoretical for H 2 O 2 in the UV/H 2 O 2 AOP using a well-established comprehensive kinetic model. A competition kinetics method for the measurement of scavenging capacity ( S c , the unknown parameter for the simple equation) was designed, for which nitrobenzene was employed as the probe compound and tert‑butyl alcohol was introduced as the standard compound. Based on this simple equation, we calculated the C opt-theoretical of 77 environmental water samples and introduced the concept of a practical optimal oxidants dose for the UV/H 2 O 2 AOP, while minimizing the operation costs in engineering applications. Moreover, this study mathematically proved that the simple equation obtained from UV/H 2 O 2 could be successfully extended to other UV-based AOPs, including UV/chlorine, UV/NH 2 Cl, UV/S 2 O 8 2− , and UV/peracetic acid. The simple equation of C opt-theoretical derived in this study may not only help to provide instructions for engineering applications, but also point out the ultimate treatment capability of each UV-based AOPs.
研究领域:
环境科学
·
化学工程
·
水处理技术
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 11
·17156-17163
·
IF 0
Zhu Meng,Zhu Jinglin,Peng Juanjuan,Zhang Bingliang,Liu Shaomin
Phosphonates have received a widespread attention in wastewater treatment due to their potential threat to the water environment. Advanced oxidation processes (AOPs) are feasible methods to degrade phosphonates, and most of the coexisting substances in water show a negative factor during their oxidation. However, the effect of bromide (Br − ) on the degradation of phosphonates in peroxymonosulfate (PMS) activation is still unclear. Herein, using 1-hydroxyethane 1,1-diphosphonic acid (HEDP) as a target phosphonate, Br − could remarkably enhance the degradation of HEDP in PMS activation compared to the PMS alone. Under the condition of pH = 7.0, the optimal degradation efficiency of HEDP is 84.8% in the PMS/Br − process after 30-min reaction, whereas no significant oxidation is obtained in the PMS/I − and PMS/Cl − processes. Multiple experiments (i.e., electron paramagnetic resonance (EPR), radical quenching experiments and chemical probs) confirm that free bromine, SO 4 •− and HO• paly a minor role in HEDP removal, and bromine radical species make a dominant responsible for HEDP oxidation. Additionally, NO 3 − , SO 4 2− , Cl − , and HCO 3 − have a little effect on the degradation of HEDP, but the HEDP removal is greatly inhibited in the presence of humic acid (HA). However, the degradation efficiency of HEDP using PMS/Br − process in river and sewage is a much higher than UV/persulfate (PDS) and UV/H 2 O 2 processes. This study provides a new sight into the effect of Br − on the degradation phosphonates in PMS activation process.
研究领域:
环境化学
·
水处理
·
化学工程
·
环境科学
✓ 已验证
DOI
WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 84
·期 12
·3616-3628
·
IF 1.915
Li Xiaoyan,Wang Hongwei,Zhang Guozhen,Zhou Tianhong,Wu Fuping
Advanced oxidation process (AOP) has attracted widespread attention because it can effectively remove antibiotics in water, but its practical engineering application is limited by the problems of the low efficiency and difficult recovery of the catalyst. In the study, nano-spinel CoFe 2 O 4 was prepared by hydrothermal method and served as the peroxymonosulfate (PMS) catalyst to degrade antibiotic amoxicillin (AMX). The reaction parameters such as CoFe 2 O 4 dosage, AMX concentration, and initial pH value were also optimized. The reaction mechanism was proposed through free radical capture experiment and possible degradation pathway analysis. In addition, the magnetic recovery performance and stability of the catalyst were evaluated. Results showed that 85.5% of AMX could be removed within 90 min at optimal conditions. Sulfate radicals and hydroxyl radicals were the active species for AMX degradation. Moreover, the catalyst showed excellent magnetism and stability in the cycle experiment, which has great potential in the AOP treatment of antibiotic polluted wastewater. Magnetic nano-CoFe 2 O 4 was fabricated by hydrothermal process. High activity of removing AMX in the CoFe 2 O 4 /PMS system. The recovery of nano-CoFe 2 O 4 was convenient due to strong magnetics. The nano-CoFe 2 O 4 exhibited good stability and reusability.
研究领域:
环境科学
·
材料化学
·
催化化学
✓ 已验证
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Sicheng Liu,Pan Li,Wanmeng Lu,Yahong Yang,Enchao Li,Shengji Xia,Daqiang Yin
The treatment capacity of ozone advanced oxidation technology for industrial wastewater is limited due to ozone’s inherent selective degradation of complex matrix components, leading the process from rapid oxidation to slow oxidation. Based on the influences of gas–liquid mass transfer characteristics and chemical reactivity on the rapid and slow oxidation processes of ozone, a synergistic process of ozone micro/nanobubbles (MNBs/O3) and H2O2 based on oxidation–reduction potential (ORP) is proposed to achieve deep removal of the ozone-resistant matrix in industrial wastewater. In deionized water, a second-order reaction kinetic method based on ozone and •OH exposure is used to assess the sensitivity of the ORP to identify the oxidation stage of MNBs/O3. Under different pH conditions, the feasibility of ORP real-time monitoring for reflecting the degradation efficiency of organic pollutants in actual dyeing wastewater effluent is further determined through batch experiments. The upward inflection point of the ORP effectively marks the end of the predominantly mass transfer-driven rapid ozonation process, which is likely the critical saturation phase point of ozone. The results further indicate that staged addition of H2O2 based on the upward inflection point of ORP in the MNB ozonation reaction is a more promising approach for deep removal of resistant pollutants.
研究领域:
环境工程
·
化学工程
·
水处理技术
·
高级氧化工艺
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 16
·23979-23994
·
IF 0
Li Yutong,Jin Xinglong,Qi Buying
The sulfate radical-based advanced oxidation processes (SR-AOPs) is a promising method for the degradation of pollutants, with the development of highly efficient catalysts for persulfate activation has been widely concerned. The novel BiCoFe-LDH (BCF-x) was synthesized successfully by coprecipitation method, which can activate peroxydisulfate (PDS) efficiently to degrade aniline. Comparative analysis with pure CoFe-LDH revealed a remarkable increase in reaction rate constant by approximately 14.66 times; the degradation rate of aniline (10 mg/L) was 100% in 60 min with the condition of 0.5 g/L BCF-1.5 and 0.5 g/L PDS, due to BCF-1.5 which was characterized as a complex of CoFe-LDH and Bi 2 O 2 CO 3 , promoting electron transport to improve the efficiency of activated PDS. In the reaction system, SO 4 •− , ·OH, and 1 O 2 were responsible for the aniline degradation and ·OH was the primary one. Furthermore, this work proposes a reaction electron transfer catalytic mechanism, which provided a new insight and good application prospect for efficient activation of PDS for pollutant degradation.
研究领域:
环境化学
·
催化
·
材料科学
·
水处理技术
✓ 已验证
DOI
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Zhujian Huang,Pingxiao Wu,Beini Gong,Shanshan Yang,Hailing Li,Ziao Zhu,Lihua Cui
To further enhance the visible light responsive property and the chemical stability of Fe/clay mineral catalysts, glutamic acid-iron chelate intercalated montmorillonite (G–Fe–Mt) was developed. The physiochemical properties of G–Fe–Mt were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), etc. The results showed that glutamic acid-iron chelates were successfully intercalated into the gallery of montmorillonite and the intercalated glutamic acid-iron chelate molecules were well preserved. The product G–Fe–Mt displayed excellent catalytic performance in heterogeneous photo-Fenton reaction under sunlight irradiation at acidic and neutral pH values. The chelation and the visible light responsiveness of glutamic acid produce a synergistic effect leading to greatly enhanced sunlight-Fenton reaction catalyzed by the heterogeneous G–Fe–Mt under neutral pH. G–Fe–Mt is a promising catalyst for advanced oxidation processes .
研究领域:
环境化学
·
材料科学
·
催化化学
·
环境污染治理
·
光化学
·
土壤与环境矿物学
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 86
·期 9
·2059-2070
·
IF 2.43
Lv Bowen,Zhang Weiliang,Liu Yu,Xu Dezhi,Fan Xiulei
This study proposed a novel advanced oxidation system to treat metal and antibiotic pollution in water simultaneously. Meanwhile, the enhancement effect of absorbed metal pollution on the activation of persulfate in the system was also investigated. As the most widely used and polluting material, tetracycline (TC) and metal Fe were used as the pollutant models. In this study, a carbonaceous material (BC) was prepared from excess sludge and then combined with the persulfate system (Fe/BC/PS). It was found that the best biochar was obtained when the pyrolysis temperature reached 500 °C (BC500), with the specific surface area of 39.712 m 2 /g. Combining it with 300 mg/L PS, the removal rate of 120 mg/L TC reached 70.6%. Moreover, the sludge biochar itself possessed numerous reaction sites and good defective structure, which provided a perfect reaction site for the variable metals absorbed by BC. They accelerated electron conduction greatly, which led to the activation of PS very active and generating far more active radicals than normal. In addition, it also proposed the rational pathway and potential mechanism of TC degradation based on the degradation intermediates. This study has a high reference value for resource utilization of sewage sludge and antibiotics removal from water. The Fe/BC500/PS system significantly enhanced TC removal efficiency. Synergistic effect of adsorption and degradation showed stronger removal capacity. Electron transfer between Fe in various valence states is the main catalytic center. The generation of · OH and SO 4 •− is the leading mechanism for TC degradation. Perspective of in-situ utilization of residual Fe for BC application was discussed.
研究领域:
环境科学
·
水处理技术
·
化学工程
·
污染控制
·
废弃物资源化利用
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 6
·2569-2582
·
IF 3.3
Shen Wentong,Zhou Liang,Liu Yongdi,Zhang Jinlong,Lei Juying
Roxarsone (ROX), a feed additive widely used worldwide, was degraded into toxic products in the natural environment. Advanced oxidation processes (AOP) based on nonradicals used for the degradation of ROX had not been reported. Herein, resorcinol–formaldehyde resins (RFs) produced by a simple high-temperature hydrothermal method had efficient photocatalytic properties to produce H 2 O 2 . FeOOH quantum dots (QDs) act as the activator and electron shuttle to decompose H 2 O 2 to produce 1 O 2 . RFs decorated with FeOOH quantum dots (RFs-Fe QDs ) were successfully synthesized and completely remove ROX with a rate of 0.03649 min −1 under simulated sunlight. Otherwise, the 99.42% arsenic-containing portion that shed from Roxarsone was eventually converted to As(V) and in-situ adsorbed by FeOOH quantum dots. The experiment data showed that ·OH, O 2 ·− and 1 O 2 participated in the degradation and 1 O 2 was the dominant reactive species. Moreover, the systems have excellent reusability and stability over a wide pH range. This study provided a new strategy for photocatalytic production of 1 O 2 to remove the ROX from water.
研究领域:
环境科学
·
纳米技术
·
催化
·
水处理
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）