WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 90
·期 4
·1132-1148
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IF 2.5
Wang Rui,Dai Zhineng,Zhang Wenqi,Ma Chao
View large Download slide View large Download slide Close modal Efficient degradation of industrial organic wastewater has become a significant environmental concern. Electrochemical oxidation technology is promising due to its high catalytic degradation ability. In this study, Co–Bi/GAC particle electrodes were prepared and characterized for degradation of 1,4-dioxane. The electrochemical process parameters were optimized by response surface methodology (RSM), and the influence of water quality factors on the removal rate of 1,4-dioxane was investigated. The results showed that the main influencing factors were the Co/Bi mass ratio and calcination temperature. The carrier metals, Co and Bi, existed mainly on the GAC surface as Co 3 O 4 and Bi 2 O 3 . The removal of 1,4-dioxane was predominantly achieved through the synergistic reaction of electrode adsorption, anodic oxidation, and particle electrode oxidation, with ·OH playing a significant role as the main active free radical. Furthermore, the particle electrode was demonstrated in different acid–base conditions (pH = 3, 5, 7, 9, and 11). However, high concentrations of Cl − and NO 3 - hindered the degradation process, potentially participating in competitive reactions. Despite this, the particle electrode exhibited good stability after five cycles. The results provide a new perspective for constructing efficient and stable three-dimensional (3D) electrocatalytic particle electrodes to remove complex industrial wastewater. A Co–Bi/GAC particle electrode for the 3D/E system was prepared by the one-step method. The production of ·OH was increased significantly by adding a 3D particle electrode. Fast and effective removal was achieved in the high range of initial 1,4-dioxane concentration. The Co–Bi/GAC particle electrode has a high catalytic activity. The 1,4-dioxane was removed via electrode adsorption and oxidation synergy.
研究领域:
环境科学
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电化学工程
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Jiejie Wang,Yalei Ding,Shaoping Tong
The present study reported a novel Fe-Ag/GAC catalyst and investigated its catalytic activity for the degradation of Acid Red 73 by persulfate. The results of characterization of Fe-Ag/GAC showed that Nano-Ag was supported uniformly on GAC with high degree of crystallinity and Fe distributed mostly in the forms of noncrystalline FeO/Fe 3 O 4 or FeOOH. The presence of catalyst greatly enhanced the removal rate of AR 73, and it was found that 99% of decolorization efficiency and 84.1% of total organic carbon removal (TOC) of AR 73 could be obtained at the neutral pH within 60 min, respectively. The optimized experiments found that either higher temperature or higher dosage of Fe-Ag/GAC or Na 2 S 2 O 8 was favored for the degradation of Acid Red 73. Lowering solution pH could improve the degradation rate of AR 73. The recycling test indicated that the catalyst was relatively stable, showing a promising application.
研究领域:
环境科学
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化学工程
·
水处理
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产品关联
DOI
高影响因子
ACS Synthetic Biology
·
2021
·
IF 5.11
Xinyi Cheng,Lu Pu,Shengwei Fu,Aiguo Xia,Shuqiang Huang,Lei Ni,Xiaochen Xing,Shuai Yang,Fan Jin
Bacterial pathogens operate by tightly controlling the pathogenicity to facilitate invasion and survival in host. While small molecule inducers can be designed to modulate pathogenicity to perform studies of pathogen–host interaction, these approaches, due to the diffusion property of chemicals, may have unintended, or pleiotropic effects that can impose limitations on their use. By contrast, light provides superior spatial and temporal resolution. Here, using optogenetics we reengineered GacS of the opportunistic pathogen Pseudomonas aeruginosa, signal transduction protein of the global regulatory Gac/Rsm cascade which is of central importance for the regulation of infection factors. The resultant protein (termed YGS24) displayed significant light-dependent activity of GacS kinases in Pseudomonas aeruginosa. When introduced in the Caenorhabditis elegans host systems, YGS24 stimulated the pathogenicity of the Pseudomonas aeruginosa strain PAO1 in a brain–heart infusion and of another strain, PA14, in slow killing media progressively upon blue-light exposure. This optogenetic system provides an accessible way to spatiotemporally control bacterial pathogenicity in defined hosts, even specific tissues, to develop new pathogenesis systems, which may in turn expedite development of innovative therapeutics.
研究领域:
微生物学
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分子生物学
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传染病学
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合成生物学
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产品关联
DOI
PubMed
高影响因子
Frontiers of Environmental Science & Engineering
·
2025
·Vol. 19
·期 7
·1-16
·
IF 6.4
Yin Wenxuan,Sun Wenjun,Yuan Yongqin,Zhang Daoyi,Zhang Yuanna,Zheng Fengyi
UV/H 2 O 2 is commonly used to remove organic micropollutants and frequently paired with activated carbon for further removal of pollutants, addressing issues such as H 2 O 2 residuals, uncontrollable by-products, and energy consumption reduction. Here, we report the changes in the removal characteristics of organic contaminants during the operation of a pilot system based on UV/H 2 O 2 coupled granular activated carbon (GAC) after in situ biofilm formation to generate biologically activated carbon (BAC). We completed the screening of unknown organic matter and molecular-level chemical transformation of 100–1600 Da dissolved organic matter (DOM) using Fourier transform high-resolution mass spectrometry (FT-ICR MS). The FT-ICR MS results indicated that BAC differs from GAC in terms of DOM removal behavior and mechanisms. GAC primarily produces free radicals through synergistic residual H 2 O 2 to further oxidize and remove organics. Low molecular weight (LMW) organics undergo general molecular chemical changes but have modest removal effects. BAC considerably lowered the chemical variety of DOM and eliminated LMW organics through biodegradation and activated carbon adsorption. According to the study findings, UV/H 2 O 2 -BAC can more effectively compensate for the drawbacks of individual technologies than UV/H 2 O 2 -GAC, with superior removal efficiency of organic pollutants, no residual H 2 O 2 , controllable effluent products, and robust performance in real environmental matrices.
研究领域:
环境科学
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水处理工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Jiasheng Zhou,Zimo Lou,Zheni Wang,Chuchen Zhou,Cheng Li,Shams Ali Baig,Xinhua Xu
The CTAB-Pd/GAC catalyst was obtained by functionalizing palladium/granular activated carbon (Pd/GAC) with cetyltrimethylammonium bromide (CTAB), which was used for the electrocatalytic reductive dechlorination of 2,4-dichlorobenzoic acid (2,4-DCBA). The degradation rate of 2,4-DCBA by 40 mg g −1 CTAB-Pd/GAC was 9.8 × 10 −3 (min −1 g −1 Pd), which was 11 folds than that by Pd/GAC (0.9 × 10 −3 min −1 g −1 Pd), and the value of q e, 2,4-DCBA / q e, BA was 2.33 as compared to 0.67 for Pd/GAC. The combined result of dechlorination and adsorption experiments suggested that the functionalization by CTAB would enhance the 2,4-DCBA concentration on the surface of CTAB-Pd/GAC, and accelerate the degradation rate. However, the removal efficiency of 2,4-DCBA would decrease when the CTAB load reached 80 mg g −1 , due to the excessive adsorption capacity for dechlorinated product. Density functional theory (DFT) calculations also proved that CTAB would increase adsorption capacity of catalyst and selective adsorption behavior of 2,4-DCBA, which accelerated the degradation rate of 2,4-DCBA.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 6
·e5612
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IF 3.14
Na Zhang,Jiaqi Bu,Yong Meng,Jia Wan,Lu Yuan,Xin Peng
In this study, Ti-Si-Sn-Sb/GAC particle electrodes were prepared by sol–gel method. The particle electrodes were characterized by SEM, XRD, EDX, and BET then used to carry out three-dimensional (3D) electrocatalytic oxidation degradation on simulated refractory p-aminophenol (PAP) wastewater. The effects of initial pH, cell voltage, aeration flow rate and initial PAP concentration on degradation experiments were investigated. Under the optimal conditions, the PAP and COD removal rates were 89.45% and 75.17% respectively. In addition, the possible degradation mechanism of PAP was further investigated by UV–Vis and HPLC. Finally, it was found that the Ti-Si-Sn-Sb/GAC particle electrodes with high catalytic activity and excellent stability could significantly improve the PAP wastewater removal efficiency.
研究领域:
环境科学
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电化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wenlan Ji,Xinyu Miao,Tian C. Zhang,Yuan Wang,Shaojun Yuan
The elimination of arsenic pollution has attracted increasing concerns due to its toxicity and severe carcinogenicity. Herein, we proposed an in-situ crystal growth strategy without surfactant to fabricate MIL-88B uniformly anchored on the surface of MnO 2 /GAC (MIL-88B/MnO 2 /GAC). Such innovative MIL-88B/MnO 2 /GAC nanostructured composites not only exhibited the synergetic functions of simultaneously oxidizing As(III) and adsorbing the generated As(V), but also effectively reduced the cost of metal–organic frameworks (MOFs) adsorbents. Impressively, the as-prepared sample achieved remarkably boosted As(III) removal capacity of 15.13 mg g −1 compared to 4.1 mg g −1 of MnO 2 /GAC composite and 2.1 mg g −1 of GAC , which was mainly ascribed to the synergistic effect between the excellent adsorption abilitiy of MIL-88B and oxidation property of MnO 2 /GAC. Owing to the unique construction and properties, the constructed MIL-88B/MnO 2 /GAC composites presented a desirable As(III) removal ability under a wide pH scope of 2 to 10. Moreover, the possible mechanism of the synergistic removal over MIL-88B/MnO 2 /GAC was elucidated by X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR) and radical trapping experiment. This work not only offers a superior bifunctional catalyst for high-efficient removal of arsenic, but also provides a new perspective for rational construction of MOF derivatives for their further applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2020
·Vol. 35
·期 2
·363-367
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IF 0.64
Yan Ming,Li Chao,Zou Yunqi,Yang Mengliu
The solid solution of (Cr 2− x Mn x )GaC with magnetic properties was synthesized by pressureless sintering. The composition, morphology, and magnetic properties of products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM). The experimental results indicate that the solid solubility of Mn is related to the value of x , which reaches the maximum at x =0.4 and the characteristic peaks shift effect is most obvious. After the solution treatments, the samples of (Cr 2− x Mn x )GaC still presents the layered structure of MAX phase, and the lattice parameter has decreased slightly. By characterizing the magnetic properties of (Cr 2− x Mn x )GaC, the successful doping of Mn atoms was confirmed, and the intensity of magnetism was positively correlated with the doping amounts of Mn.
研究领域:
材料科学
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固体化学
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磁性材料
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陶瓷材料
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纳米材料
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 17
·25952-25963
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IF 0
Di Hongcheng,Jiang Zhuwu,Sun Fengyi,Yang Jiahan,Cheng Wei,Lu Jiahui,Zhang Hongyu,Bai Xue
Nitrogen-containing disinfection by-products (N-DBPs) produced in the process of drinking water disinfection are widely concerning due to the high cytotoxicity and genotoxicity. It is due to the difficulty of natural degradation of N-DBPs in water and the fact that conventional treatment systems do not effectively treat N-DBPs in drinking water. In this study, N-nitrosopyrrolidine (NPYR) in water was electrocatalytically degraded by a three-dimensional electrode reactor (3DER). This system applied graphite plates as anode and cathode. The granular activated carbon (GAC) was used as third electrode. The degradation of NPYR using a continuous flow three-dimensional electrode reactor was investigated by examining the effects of flow rate, current density, electrolyte concentration, and pollutant concentration on the degradation efficiency, energy consumption, and reaction kinetics of GAC particle electrodes. The results showed that the optimal operating conditions were flow rate = 0.45 mL/min, current density = 6 mA/cm 2 , Na 2 SO 4 concentration = 0.28 mol/L, and NPYR concentration = 20 mg/L. Under optimal conditions, the degradation of NPYR exceeded 58.84%. The main contributor of indirect oxidation was deduced from free radical quenching experiments. NPYR concentration was measured by GC–MS with DB-5 capillary column, operating in full scan monitoring mode for appropriate quantification of NPYR and intermediates. Based on the identification of reaction intermediates, a possible pathway for the electrochemical oxidation of NPYR on GAC particle electrodes was proposed.
研究领域:
环境科学
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化学工程
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饮用水处理
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DOI
PubMed
RSC Advances
·
2015
·Vol. 5
·期 102
·84303-84310
·
IF 3.84
Lian Duan,Yanling Chen,Kaixuan Zhang,Huoyan Luo,Jianxin Huang,Aihua Xu
The cobalt-based heterogeneous catalysts CoxOy-N/GAC were prepared by pyrolysis of a cobalt–phenanthroline complex on granular active carbon (GAC) in a nitrogen atmosphere, and tested for the degradation of Acid Orange 7 using hydrogen peroxide as a benign oxidant in a bicarbonate aqueous solution. Characterization by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and electron spin resonance spectroscopy revealed the formation of a cobalt oxide nanoparticle shell with a metallic Co core on the surface of GAC; and the nitrogen substituted the selected carbon atoms during the pyrolysis process and bonded to cobalt. The catalysts were active for dye decolorization in an aqueous solution containing 10 mM H2O2 and 5 mM NaHCO3 at room temperature. They also presented good stability with nearly no loss of cobalt ions after the reaction, in comparison with the high leaching of Co (0.25 mg L−1) from the CoxOy/GAC catalyst without nitrogen. The production of intermediates, the formation of reactive radicals and the effect of HCO3− were also investigated to further explore the efficiency of the catalyst. This study can provide a promising way for the activation of the green oxidant H2O2 in a bicarbonate aqueous solution by heterogeneous cobalt catalysts for environmental remediation.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Dandan Lv,Yan Wang,Hui-qiang Li
Tetracycline hydrochloride (TC-HCl) was harmful to human as well as ecology due to its persistence. Layered double hydroxides (LDHs), granular activated carbon (GAC) and graphene oxide (GO) were selected as the catalyst supporting materials for the three-dimensional heterogeneous electro-Fenton (3D-EF) process. The three materials were then used to prepare catalyst particles of GAC@Fe 3 O 4 , LDHs@Fe 3 O 4 and GO@Fe 3 O 4 to degrade TC-HCl. The characterizations of the LDHs@Fe 3 O 4 (8:2) particles were done by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and Brunauer– Emmett–Teller. At pH of 3, the proper ratio of supporting materials (LDHs, GO, GAC) to Fe 3 O 4 improved the removal efficiency of TC-HCl. GAC@Fe 3 O 4 (8:2), LDHs@Fe 3 O 4 (8:2) and GO@Fe 3 O 4 (2:8) obtained better performance, LDHs and GO used as supporting material had better performance than GAC. Further study on the effect of different pH values showed that the LDHs@Fe 3 O 4 (8:2) acquired the highest chemical oxygen demand (COD) removal efficiency (63.03%) at pH of 7. LDHs@Fe 3 O 4 (8:2) and GO@Fe 3 O 4 (2, 8) obtained similar COD removal efficiencies at pH of 3. The percentage of Fe 2+ leaching to solution was 2% for the LDHs@Fe 3 O 4 , which was 2.9% for the GAC@Fe 3 O 4 and 5.46% for the GO@Fe 3 O 4 . Experimental results showed that more H 2 O 2 and • OH were produced on the surface of the LDHs with pH of 7. Finally, GC-MS was used to determine the degradation pathway of TC-HCl. The LDHs had obvious advantages as catalyst supporting materials for the 3D-EF process.
研究领域:
环境工程
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水处理技术
·
催化化学
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环境污染与控制
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材料科学
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环境功能材料
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Fuzhen Liu,Xue Wang,Zhengzhi Liu,Fei Miao,Yin Xu,Hui Zhang
Zinc oxide supported on granular activated carbon (ZnO-GAC) was synthesized for the photocatalysis of Reactive Black 5 (RB5) with the presence of peroxymonosulfate (PMS). RB5 removal was improved with increasing temperature and dosage of PMS or catalyst, but declined with increasing pH and RB5 concentration. The reaction followed first-order kinetic model and the activation energy was determined to be 16.15 kJ mol −1 . After 60 min treatment, 43.6% of TOC was removed and further extending the reaction time to 90 min resulted in 51.9% TOC removal. The evolution profile of ammonium and nitrate ions was monitored during the treatment, and the organic degradation products of RB5 oxidation were identified by LC-MS analysis with a plausible degradation pathway being proposed. Quenching experiments indicated that electron hole (h + ) and reactive radicals (e.g. HO • /SO 4 •− ) were mainly responsible for RB5 removal in the UV/ZnO-GAC/PMS system. The catalyst reuse experiment shows that ZnO-GAC had no obvious deactivation after four cycles, which implied the reusability and stability of the prepared catalyst. Response surface methodology (RSM) with Box-Behnken design (BBD) was used to evaluate the effect of operating conditions, including PMS concentration, reaction temperature and initial pH on the removal rate of RB5. The result of adequacy check indicated the proposed RSM model was reliable and accurate to analyze the operating parameters of the UV/ZnO-GAC/PMS system.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）