Environmental Progress & Sustainable Energy
·
2016
·Vol. 35
·期 4
·975-981
·
IF 1.631
Rongrong Miao,Minli Wang,Junjun Shen,Ping Ning,Junjie Gu,Qingqing Guan,Qiuling Chen,Xinsheng Chai
The sub/supercritical water oxidation (SCWO) of wastewater with high concentrations of pollutants from tall oil rosin production base was studied under the temperature range of 320°C–420°C and the pressure range of 11–25 MPa. The results showed that after pretreatment with Ca(OH) 2 for ions removal, around 385 mg/L remained which inhibited the oxidation activity by reducing the concentration of hydroxyl radicals (•OH). Since the wastewater compounds were mainly cyclic organic materials, higher O 2 contents (stoichiometric ratio over 2.5) and temperatures (over 380°C) are favorable for TOC removal. With O 2 SR = 2.5 and T = 420°C, the TOC removal reached almost 100% (99.89%) in 30 min. A global kinetic model for TOC removal during SCWO treatment was built during the research. The kinetic data acquired through the model were fitted to a power-law function, and the data correlated well with the experimental data. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 975–981, 2016
研究领域:
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yong Chen,Junfeng Zhao,Lu Hu,Jing Tian,Yong Liu
Most metal-organic frameworks (MOFs) are synthesized from carboxylate and metal precursors by hydrothermal process, which will consume a large amount of solvent and carboxylate. To address this issue, a new strategy for Cu-based MOFs was developed, in which the Cu-based MOFs was obtained by using abundant natural polymer (tannic acid) as one of the precursors and using high-energy ball milling to achieve a self-assembly of tannic acid and copper sulfate. Based on this strategy, a novel Cu-based MOFs derivative (Cu x O@C composite) was synthesized by high-temperature sintering of Cu-based MOFs and used for sulfamerazine (SMR) removal via O 2 activation. The BET specific surface area and average pore size of Cu x O@C composite were 110.34 m 2 g −1 and 21.06 nm, respectively, which made Cu x O@C composite had the maximum adsorption capacity ( Q max ) for SMR of 104.65 mg g −1 and favored the subsequent degradation of SMR. The results from XRD and XPS indicated that Cu x O@C composite contained a lot of Cu 0 and Cu 2 O with the sizes of 76.6 nm and 9.8 nm, respectively, which led to its high performance of O 2 activation. The removal efficiency of SMR and 90.2% TOC achieved 100% and 90.2%, respectively in the Cu x O@C/air system at initial pH of 4.0, air flow rate of 100 mL min −1 , Cu x O@C dosage of 1 g L −1 and reaction time of 30 min. Reactive species, including H 2 O 2 , OH and O 2 - radicals were detected in the Cu x O@C/air system, and OH and O 2 - were mainly responsible for the degradation of SMR.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Bei Wu,Zhiqiang Jiang,Weidong Lei,Jie Sun,Zhi Chen
In a conventional electro-Fenton system with a single cathode, it is difficult to attain both high H 2 O 2 generation by oxygen reduction reaction (ORR) and efficient iron reduction reaction (FRR). For this study, a flow-through dual-system electro-Fenton (FT-DEF) reactor was designed to overcome this shortcoming and promote mass transfer to effectively remove dimethyl phthalate (DMP) from water. By comparing the ORR and FRR performances of four different commercial carbon electrodes, the graphite felt with the highest amount of H 2 O 2 generation was selected as the cathode of the ORR system, and the activated carbon fiber with the best Fe (III) reduction effect was selected as another cathode of the FRR system. The ORR system and FRR system operate simultaneously to form the DEF system. The FT-DEF system displayed many advantages compared with the conventional electro-Fenton (CI-ORR), presenting an improved efficiency and low energy consumption in phthalates removal. Under optimal reaction conditions, the FT-DEF system is capable to degrade 100% DMP in 20 min, which is 25% higher than the CI-ORR, while the reaction rate constant (0.271 min −1 ) is 16 times that of CI-ORR system (0.017min −1 ). In addition, the TOC removal of FT-DEF achieving 72.3% within 2 h with energy consumption of 2.35 kW h·m −3 is much better than CI-ORR that only achieves 18.3% TOC removal within 2 h with energy consumption of 8.13 kW h·m −3 . Furthermore, control parameters and mechanism of FT-DEF were investigated in detail. The main intermediate products of DMP were analyzed by UPLC-ESI-HRMS, and the possible degradation path of DMP was speculated. In addition, application of FT-DEF in three types of natural water demonstrated its universal applicability of the system.
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
Applied Sciences-Basel
·
2018
·Vol. 8
·期 4
·615
·
IF 1.689
Xiangyi Shen,Jing Xu,Ivan P. Pozdnyakov,Zizheng Liu
Used as a kind of feed additive,p-arsanilic acid can pose a potential risk to organisms when abandoned in the environment. The photodegradation ofp-ASA was investigated under UV-C irradiation in the presence of persulfate (PS) in this work. The addition of PS facilitated the decomposition ofp-ASA and notably, the presence of 50 mmol PS brought about a nearly complete mineralization after 3 h, while an insignificant total organic carbon (TOC) removal was observed under UV irradiation (λ = 254 nm) only. Experimental results proved that sulfate radical (SO4•−) was responsible for the promotion effect. The cleavage of As-C bond released inorganic arsenic and caused the occurrence of various organic products, for example, hydroxybenzaldehyde, nitrobenzene, benzenediol sulfate, and biphenylarsinic acid. The application of PS with UV-C light may throw a light on thorough treatment forp-ASA containing wastewater.Keywords:p-arsanilic acid;photodegradation;UV/persulfate system;sulfate radical
研究领域:
环境科学
·
化学工程
·
水处理
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Chengqun Xu,Feng Long Gu,Honghai Wu
A BiOCl-Mt material assembled from BiOCl and Na-montmorillonite (Na-Mt) was characterized by XRD , FT-IR, TEM, XPS and UV–vis DRS . Na-Mt was clearly demonstrated to be capable of improving BiOCl's photocatalytic performance. The focus was placed on the evaluation of BiOCl-Mt in the terms of photocatalytic activity for cationic Rhodamine B (RhB) and anionic Orange G (OG). Both can be removed more efficiently using BiOCl-Mt compared with pure BiOCl under ultraviolet light irradiation. Although h v b + and O 2 − are the two primary reactive species, the improved photocatalytic degradation performance is primarily attributed to the enhanced separation of photogenerated charge carriers in the catalyst. The Bronsted acidity derived from montmorillonite acid sites and the dissolved oxygen in the solution are capable of promoting dye photocatalysis because they effectively capture the photogenerated electrons. Under optimized conditions, TOC mineralization with rates of 82.3% for RhB and 85.9% for OG was obtained in a BiOCl-Mt catalysed photocatalysis process. The mechanism responsible for the oxidative decomposition of the two different dyes is primarily hole-driven. BiOCl-Mt was stable during the process, with its structures remaining almost unchanged after it was recycled three times. Therefore, BiOCl-Mt will have a promising worldwide application in dye-containing wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FlatChem
·
2023
·
IF 6.2
Xia Xu,Changchun Chen,Lingxiu Shu,Cheng Cheng,Zhonghai Tang,Yifeng Wang,Lin Pan,Zishen Guan
Water pollution can be efficiently treated by semiconductor photocatalysts under sunlight irradiation. In this study, novel S-scheme SrTiO 3 /ZnIn 2 S 4 composites were successfully fabricated via a facile oil-bath method. And the synthesized samples were then characterized by various characterization techniques together with Density Functional Theory (DFT) calculation. The X-Ray Diffraction(XRD)patterns show that SrTiO 3 /ZnIn 2 S 4 composites are composed of cubic perovskite structure SrTiO 3 and hexagonal phase ZnIn 2 S 4 . The High Resolution Transmission Electron Microscope(HRTEM)and Field Emission Scanning Electron Microscope (FESEM) images showed the intimate contacts between SrTiO 3 and ZnIn 2 S 4 are established to form the heterojunction. The photocatalytic activity of the composite was excellent when degrading organic pollutants, which outperformed that of pristine SrTiO 3 and ZnIn 2 S 4 . The prepared SrTiO 3 /ZnIn 2 S 4 -33% composite sample was proved to have the best photocatalytic activity, with 98 % degradation of organic pollutants under 32 min. The ·O 2 – is the main active reaction species for the degradation of organic pollutants, which was demonstrated by free radical trapping experiment. In addition, the mineralization of organic pollutants during the degradation process was analyzed by Total Organic Carbon (TOC) test. According to a series of experimental and theoretical calculations, the S-scheme heterojunction formed in the SrTiO 3 /ZnIn 2 S 4 composite is put forward for comprehending the photocatalytic degradation of organic pollutants and the formation of free radicals.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2020
·Vol. 146
·期 3
·04020005
·
IF 1.264
Xiaoshu Wei,Xiaomin Xie,Yi Wang,Sen Yang
Octahedral and spherical Fe3O4 nanoparticles (NPs) were synthesized and used as heterogeneous Fenton-like catalysts to degrade methylene blue (MB). Their catalytic activities were investigated by evaluating the effects of pH, catalyst dosage, H2O2, and MB concentration on the removal efficiency of MB and total organic carbon (TOC). Nearly complete color removal was achieved in 20 min at pH 3.0 in both Fenton-like systems with a low H2O2 concentration of 1.0 mmol L−1. Removal of >90% MB was achieved in the fifth and third runs by octahedral and spherical Fe3O4 NPs, respectively, and the two catalysts eliminated 77.1% and 62.9% of TOC in solution in 30 min of the first cycle. The removal rates of MB as a function of surface area were slower in the presence of spherical than octahedral Fe3O4 NPs, indicating shape-dependence of the NPs’ Fenton-like catalytic activity. The catalytic activity and reusability of octahedral Fe3O4 NPs were superior to that of spherical NPs. HO· was found to be the main active species in the Fenton-like system.
研究领域:
环境科学
·
纳米技术
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 5
·1795-1805
·
IF 3.069
Hao Liu,Xiaodong Zhu,Rui Han,Yuxue Dai,Yuanling Sun,Yanna Lin,Dandan Gao,Xueying Wang,Chuannan Luo
Study of the degradation mechanism of the Cu2O/g-C3N4 p–n heterojunction is very challenging and important for the preparation and practical applications of the g-C3N4 photocatalyst in controlling water pollution. Therefore, the Cu2O/g-C3N4 p–n heterojunction was designed and prepared successfully and the mechanism of enhanced visible-light photocatalytic activity was proposed. The morphology and structure of the synthesized materials were characterized by using SEM, TEM, FT-IR and XPS. And the optical and electrical properties of the materials were studied by measuring DRS, the photocurrent density and the Mott–Schottky curve. The results showed that the g-C3N4 photocatalyst is coated on the surface of Cu2O to form a tight heterojunction, which facilitates the separation and migration of photogenerated carriers, and the quantum yield of the Cu2O/g-C3N4 composite photocatalyst was 3–7 times higher than that of the single component. It has been shown that the built-in electric field formed at the heterojunction interface can effectively separate photogenerated electrons and holes. The photocatalytic performance of the material was evaluated by the photocatalytic degradation of tetracycline (TC) under visible light. The maximum degradation rate of Cu2O/g-C3N4 for TC could reach over 90% in 90 min, and the degradation rate of the single component is more than doubled. Simultaneously, the TOC tests monitored the mineralization of TC up to 83.4%, and the active substances in the reaction process were determined to be ˙O2− and h+ through free radical trap experiments and ESR tests. This work shows that the construction of an internal electric field has greatly improved the photocatalytic performance of g-C3N4. The Cu2O/g-C3N4 p–n heterojunction has good degradation ability toward tetracycline and is a good tetracycline-type wastewater treatment material.
研究领域:
材料科学
·
环境科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiaoyue Zhou,Yunying Liu,Yingqi Miao,Wenwen He,Yanan Pan,Adela Jing Li,Junhao Qin,Huashou Li,Renli Yin,Rongliang Qiu
Piezo-photocatalytic processes based on heterogeneous catalysts, by establishing electronic fast track to realize electronic storage and conversion, are proved to be effective ways to improve the efficiency of PMS activation. Herein, α-SnWO 4 /ZnO catalyst with p-n heterojunction was constructed to testify the piezo-photocatalytic effect on peroxymonosulfate (PMS) activation for pollution control. The decomposition rate of carbamazepine (CBZ) in the piezo-photocatalytic PMS activation process by α-SnWO 4 /ZnO heterojunction was 12.6 and 5.2 times to that by ZnO and α-SnWO 4 processes, respectively. In addition, the total organic carbon (TOC) removal rate of CBZ reached 89%, and TOC in the actual water body was also effectively removed. Free radical quenching and detection experiments showed that nonradicals ( 1 O 2 ) and free radicals (O 2 − , OH) were the mainly active species of the process, by which the toxicity of the intermediates of CBZ was significantly reduced by the combination of the radical and nonradical pathways through hydroxylation and singlet oxygen oxidation . Furthermore, the influences of the experimental factors, including the initial pH, PMS concentration, temperature and reuse of catalysts on CBZ degradation were evaluated. Notably, the activation energy (Ea) in this work was calculated as 34.2 kJ mol −1 , which was lower than that of other reported systems. Overall, this work can scientifically guide the design of high-performance piezo-photocatalysts to use common metals for efficient activation of PMS as economical alternatives over expensive rare metal catalysts for water purification.
研究领域:
环境科学
·
催化
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Chao Zhu,Yiruo Huang,Ze Ding,Zarak Mahmood,Xingang Kong,Hongrui Ma,Xianbao Wang
Coking wastewater, characterized by high biological toxicity, poses significant challenges for traditional biological treatment methods. This study developed a novel in-situ immobilized photocatalytic-algae-bacteria consortia (P-ABC) system using a polyether polyurethane sponge as a carrier, aiming to enhance biological treatment efficiency for actual coking wastewater. Results showed a 16.8 % increase in algal density (up to 1.51 × 10⁵ cells/mL) in the P-ABC system compared to non-coupled controls, with significantly improved microbial metabolic activity, confirming the carrier's exceptional biocompatibility. Compared to standalone algae-bacteria consortia systems, the P-ABC system achieved higher removal efficiencies for chemical oxygen demand (COD Cr , 19.8 %), total organic carbon (TOC, 21.2 %), and total nitrogen (TN, 30.4 %). These findings validate the system's potential for improving stable and efficient treatment of industrial wastewater. Furthermore, this study offers insights into bio-enhanced treatment technologies and provides a reference pathway for integrating advanced oxidation and biological processes.
研究领域:
环境工程
·
废水处理
·
生物技术
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yaoyu Zhou,Jianlong Wang
Developing high performance electrocatalysts for effective antibiotics elimination for heterogeneous electro-Fenton (Hetero-EF) process is still a challenge. This work synthesized iron/cobalt bimetallic N doped graphitic carbon cages (Fe x Co@NC) from ZIF-8@ZIF-67-Fe dual MOF composite for Cephalosporin C (CEP-C) degradation in the Hetero-EF system at a wide pH range. Results indicated that CEP-C degradation rate and total organic carbon (TOC) removal efficiency by Fe 40 Co@NC catalyst were as high as 82.45% (60 min) and 61.35% (240 min) at natural pH, respectively. The unique structure with FeCo bimetal encapsulated inside the N doped graphitic carbon cages enabled Fe 40 Co@NC to show excellent catalytic reactivity for H 2 O 2 activation. The generated M (•OH) and •OH all contributed to CEP-C degradation. The synergistic effects of Co 0 /Co 2+ /Co 3+ and Fe 0 /Fe 2+ /Fe 3+ cycles made Fe 40 Co@NC catalyst to continuously activate H 2 O 2 . Moreover, Fe 40 Co@NC catalyst showed good stability in consecutive cycles, and could still remain excellent reactivity when applied for CEP-C degradation from the real CEP-C fermentation residue supernatant. Furthermore, a possible CEP-C degradation pathway was proposed based on the identified intermediates.
研究领域:
环境科学
·
化学工程
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xiaodong Zhang,Jinfeng Chen,Shuntong Jiang,Xialu Zhang,Fukun Bi,Yang Yang,Yuxin Wang,Zhong Wang
Anatase/rutile titanium dioxide (TiO 2 ) with heterophase junction and large Brunauer-Emmett-Teller (BET) specific surface area (50.1 m 2 g −1 ) is successfully synthesized by calcinating Materials of Institut Lavoisier-125(Ti) (MIL-125(Ti)) with 30% O 2 /Ar at the temperature of 600 °C (M−O−600). Several techniques are used to examine the physicochemical, photoelectrochemical and optical properties of samples, and their photocatalytic performances are evaluated by photodegradation of gaseous toluene and liquidus tetracycline (TC) under visible light illumination. It is found that the calcination temperature has significant influence on the crystal structure and physicochemical parameters of TiO 2 . The weight fractions of rutile and anatase TiO 2 of M−O−600 are approximately 0.7 and 0.3, which displays outstanding photocatalytic activity . Through the construction of heterophase junction, M−O−600 has better oxygen adsorption and higher density of localized states, which effectively promotes the generation of superoxide radical (·O 2 – ) and hydroxyl radical (·OH) species. In-situ infrared spectra indicate that toluene is oxidized to benzyl alcohol , benzaldehyde and benzoic acid in turn and then oxidized to formic acid and acetic acid before eventually degraded into H 2 O and CO 2 . Gas chromatography-mass spectrometry (GC–MS) is also used to further investigate the degradation pathway of toluene. Degradation pathway and mechanism of TC are studied by liquid chromatography-tandem mass spectrometry (LC-MS). Moreover, three-dimensional excitation-emission matrix fluorescence spectroscopy (3D EEMs) and total organic carbon (TOC) show that TC can be effectively mineralized through a series of reactions by M−O−600 during photocatalysis .
研究领域:
环境科学
·
材料科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）