JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Hongyu Liu,Qingyun Han,Xueyao Zhang,Huan Zhang,Huicai Wang,Junfu Wei
In this work, N-doped biochar balls NBC 3 800 were prepared from waste biomass corn straw. The biochar balls supported by clay have an obvious spherical structure. Clay can enhance the adsorption capacity of the biochar balls to pollutants by its excellent adsorption property. Thus, the clay can speed up the catalytic reaction by strengthening the adsorption function. The biochar balls NBC 3 800 have the best catalytic performance and the removal rate of NC can reach 100% within 100 min. The electron transfer resistance of NBC 3 800 is only 36 Ω indicating a lower resistance value and higher conductivity to transfer electrons compared with carbon nanotube. Electron paramagnetic resonance (EPR) and electrochemical analysis show that sulfate radical (SO 4 •− ), hydroxyl radical (·OH), singlet oxygen ( 1 O 2 ), and electron transfer are all involved in the reaction. The removal rate of NC can still be maintained at 83.41% after being reused five times. Besides, it can be further improved to 100% by high temperature regeneration at 800 ℃. Most importantly, the biochar balls can be separated from the solution very easily which not only extremely improves the recyclability but also avoids secondary pollution to the water body.
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高影响因子
Processes
·
2024
·Vol. 12
·期 12
·2670
·
IF 2.8
Ke-Hong Chen,Ao-Tian Gu,Liang Zhang,Hao Tang,Zhi-Ming Zhang,Yi-Ming Zhou,Yu-Qi Cheng,Yi Yang
Chloramphenicol antibiotics (CAPs) are broad-spectrum antibiotics, and excessive consumption has led to increasingly dangerous residues in the environment. The accumulation of these highly toxic and difficult-to-biodegrade CAPs and their long-term exposure in ecological environments can pose insidious and long-term hazards to human health and aquatic organisms. In this study, co-carbon composite nanocatalysts (CoxZn10−x-NC) with many carbon nanotubes on the surface were prepared via the one-step pyrolysis of bimetallic CoxZn10−x-ZIF with different Co/Zn ratios and used for the degradation of trace amounts of CAPs in a water column. The microstructure and chemical composition of the prepared catalysts were fully characterized using SEM, TEM, and XPS. The CAP degradation experiments demonstrated that Co6Zn4-NC in CoxZn10−x-NC possessed the highest catalytic activity level, removing 100% of the CAPs in 60 min. The CAPs had a corresponding reaction rate constant of 0.22 min−1, and Co6Zn4-NC was able to completely mineralize 44.57% of them. Doping moderate amounts of Zn can effectively improve the carbon nanotube structure on the catalyst surface and promote the generation of monoatomic Co, thus improving catalytic activity. The results of the free-radical burst experiments and electron paramagnetic resonance (EPR) showed that the free-radical pathway mainly dominated within the Co6Zn4-NC+PMS system, in which SO4•−was the main ROS for CAP degradation.
研究领域:
环境科学
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材料科学
·
化学
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 7
·2793-2806
·
IF 3.3
Zhang Xinxi,Cao Min,Liu Da,Lei Juying,Zhang Jinlong,Liu Yongdi,Zhou Liang
Advanced oxidation processes based on peroxymonosulfate (PMS) activation are widely used for the removal of antibiotic contaminants. However, the commonly used transition metal catalysts suffer from secondary contamination due to ions leaching during the activation of PMS. Herein, the oxygen and nitrogen co-doped carbon material (Nv-NC-2) with abundant mesopores was obtained by simple high-temperature calcination using covalent organic frameworks (COFs) as precursors and NH 4 Cl as an activator. The Nv-NC-2/PMS system exhibited excellent levofloxacin removal efficiency under a wide pH and complex water environment with anions interference. The C=O in Nv-NC-2 was identified as the main active sites through degradation experiments and XPS. Furthermore, the electron paramagnetic resonance, quenching experiments and probe capture experiments demonstrated 1 O 2 and \({\text{O}}_{2}^{ - }\) were dominant active species. This study enhances the catalytic activity of COFs-derived carbon materials through a simple activation technique, which provides a novel method for surface modification of carbon materials.
研究领域:
环境科学
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材料科学
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高影响因子
Catalysts
·
2025
·Vol. 15
·期 12
·1117
·
IF 4
Pengcheng Dai,Xiangjian Wang,Yongxin Zhao,Huishan Chen,Hui Zhao,Longzhen Cheng,Longxi Xu,Zeyu Zhang
Tetracycline (TC), a widely used antibiotic, persists in aquatic environments due to its chemical stability, bioaccumulation potential, and role in promoting antimicrobial resistance, posing significant ecological and public health risks. To address the pressing need for effective wastewater treatment technologies, a cobalt nanoparticle-embedded boron nitride nanocomposite (Co/BN) was developed for efficient peroxymonosulfate (PMS) activation. Among the synthesized catalysts, Co/BN-1 exhibited outstanding performance, achieving near-complete TC degradation within 5 min under mild conditions, along with excellent stability and reusability over four consecutive cycles, accompanied by minimal cobalt leaching. Mechanistic studies combining radical scavenging assays and LC-MS analysis revealed the involvement of both radical species (SO4−and OH) and non-radical pathways (1O2), highlighting a synergistic effect between Co nanoparticles and the BN matrix. This work demonstrates the feasibility of Co/BN composites as highly efficient, stable, and eco-friendly catalysts for sulfate radical-based advanced oxidation processes (SR-AOPs), providing a promising strategy for the rapid and sustainable removal of antibiotic pollutants from water systems.
研究领域:
环境科学
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材料化学
·
水处理技术
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纳米复合催化
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污染物降解
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Yonglei Xing,Bingjie Meng,Jian Yi,Xiaoyong Jin,Gang Ni,Jing Chen
In this study, a BiVO 4 photoanode was prepared via electrodeposition, and FeOCl was subsequently loaded onto its surface by calcination to construct a novel n–n type FeOCl/BiVO 4 heterojunction photoanode with a S-scheme charge transfer pathway. Using levofloxacin (LVF) as the target pollutant, the photoelectrocatalytic performance of various photoanodes was systematically evaluated. Under an applied bias of 0.6 V and 0.075 mM PMS, the FeOCl/BiVO 4 photoanode achieved a 79% LVF removal efficiency within 30 minutes, representing a 39% enhancement over pristine BiVO 4 , along with significant mineralization capacity. The addition of PMS notably improved the degradation performance. Photoelectrochemical analyses revealed that FeOCl suppressed charge recombination and enhanced PEC activity. Scavenger experiments demonstrated that hydroxyl radicals (·OH), superoxide radicals (·O 2 − ), sulfate radicals (SO 4 · − ), and photogenerated holes ( h + ) all contributed to the pollutant degradation. Furthermore, pH adaptability, anion interference, and cyclic stability tests demonstrated the photoanode’s broad pH tolerance, excellent anti-interference ability, and good reusability. Notably, the FeOCl/BiVO 4 photoanode also exhibited effective degradation of other typical organic pollutants, such as tetracycline, carbamazepine, and ciprofloxacin, highlighting its promising application potential.
研究领域:
环境科学
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材料化学
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光催化
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水处理技术
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环境污染控制
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Xi Quan,Jun Zhang,Linlin Yin,Wei Zuo,Yu Tian
In this work, novel Fe 3 O 4 @α-CD nanoparticle was synthesized for the catalytic activation of peroxymonosulfate (PMS) towards carbamazepine (CBZ) degradation. The effect of α-CD content, Fe 3 O 4 @α-CD dosage and PMS concentration on the catalyst activity were systematically evaluated. The results showed the synergistic effect between α-CD and Fe 3 O 4 can greatly improve the removal efficiency of CBZ in the Fe 3 O 4 @α-CD/PMS system. CBZ removal efficiency gained 73.37% in 5 min at pH 7.0 with PMS 1 mM, Fe 3 O 4 @α-CD load 0.4 g/L and CBZ 10 μM. The variation in the removal efficiency of different PPCPs under the same conditions mainly ascribed to the adsorption of α-CD and the activation of PMS by Fe 3 O 4 to generate free radicals, in which sulfate radical (SO 4 ·− ) and hydroxyl radicals ( · OH) was determined as the reactive species in the Fe 3 O 4 @α-CD/PMS system. Density functional theory (DFT) calculations was also utilized to optimize the structure of composite and confirmed that the charge distribution mainly concentrate on Fe 3 O 4 . As deduced from the LC-MS analysis, the possible CBZ degradation pathways were proposed. CBZ degradation efficiency still reached 54% after three cycle, which indicates that Fe 3 O 4 @α-CD catalyst has a good reusability potential and practical applications.
研究领域:
环境科学
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材料科学
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催化化学
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DOI
高影响因子
Solar RRL
·
2026
·Vol. 10
·期 11
·e70402
·
IF 4.8
Shuai Wang,Xiaona Liu,Yang Yang,Tianwei Dou,XiongWei Liang,Changhao Yao,Xiaofan Zhao,Baojiang Jiang
Photocatalytic persulfate (PMS) activation has gained significant attention for environmental remediation. Despite progress, developing efficient, sustainable photocatalysts remains challenging. We report a solvothermally synthesized In 2 O 3 /Mn 2 O 3 Z-scheme heterojunction with subsequent ion impregnation. This novel photocatalyst demonstrates exceptional PMS activation under visible light, achieving 95.2% tetracycline (TC) degradation within 120 min. The enhanced performance stems from intimate interfacial contact in the Z-scheme configuration, facilitating rapid photogenerated charge transfer. Furthermore, PMS serves dual roles as radical precursor and electron scavenger, promoting generation of reactive radicals for TC degradation. This work presents an advanced Z-scheme photocatalyst system offering efficient organic pollutant removal, with potential applications in water purification technologies.
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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.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Chunsheng Ding,Hangtian Zhang,Xinze Song,Yuqiang Pan,Qiongfang Wang,Jing Deng
Bisphenol A (BPA) is an endocrine disruptor widely used in industry and the increased incidence of many cancers has been shown to be related to their exposure. Effective removal of BPA is causing concern. In this article, it was found that the introduction of caffeic acid (CFA) might significantly improve BPA degradation in Fe 3 O 4 /PMS system. The use of Fe 3 O 4 /CFA/PMS system offers a number of advantages compared to previously used homogeneous systems, including a wider pH range for application, ease of production, and minimal biotoxicity. Based on the analysis and discussion of the experimental data, it is clear that BPA can be almost completely degraded within 40 minutes under the most efficient conditions of 0.4 mM PMS, 0.5 g/L Fe 3 O 4 , and 0.05 mM CFA. BPA was successfully removed over a broad pH range of 3.0–9.0. Due to the presence of reactants in different states, the inhomogeneous system is less significantly disturbed by H + and OH - compared to the homogeneous system. The presence of Cl - , HCO 3 - , NO 3 - and humic acid influences the removal of BPA. The intermediate product (benzoquinone) of CFA was found to be involved in the reaction and effectively promoted the recycling of Fe(II) and Fe(III). By the formation of CFA-Fe chelates, the reducing and chelating ability of CFA accelerates Fe(III)/Fe(II) cycling and thus promotes the activation of PMS. Ethanol scavenging studies and chemical probe experiments showed that the presence of hydroxyl radicals (HO·), sulphate radicals (SO 4 ．- ) and singlet oxygen ( 1 O 2 ) plays a role in the elimination of BPA in Fe 3 O 4 /CFA/PMS system. The contribution rate is found to be SO 4 ．- >HO·> 1 O 2 . The current research provides a low-cost, environmentally friendly method to remove BPA.
研究领域:
环境科学
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化学工程
·
水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Zhen Huang,Ziyang Chu,Haibo Liu,Tianhu Chen,Xuehua Zou,Fuwei Sun,Dong Chen
Effective removal of heavy metal complexes from contaminated water remains a challenging task. In this work, a limestone/PMS system was constructed for the efficient degradation of Cu-EDTA. Under the conditions of 3.0 g/L limestone and 1.0 mM PMS, the degradation efficiency of 10.0 mg/L Cu-EDTA reached 99.0 % in 60 min, and the removal efficiency of Cu ions approached 50.0 %. The main active specie revealed by quenching and EPR experiments was the singlet oxygen ( 1 O 2 ). Interestingly, Trace amounts of Cu(II) in limestone react with PMS enhancing the degradation of Cu-EDTA. The results of the HPLC-MS analysis showed that the reactive species attacked the Cu–O and Cu–N bonds, as well as triggered a decarboxylation process, resulting in the decomposition of Cu-EDTA into six intermediates. Meanwhile, SEM and XPS analyses revealed that Cu ions released during the degradation of Cu-EDTA are deposited on the limestone surface as Cu(OH) 2 and Cu 2 (OH) 2 CO 3 . In addition, the initial pH and co-existing ions have a weak effect on the system. Finally, a one-month continuous flow experiment showed that the degradation efficiency of Cu-EDTA was about 95.0 % and the removal efficiency of Cu ions was 40.0 %. In conclusion, this study provides a new approach for the destruction of metal complexes and the removal of heavy metals.
研究领域:
环境科学
·
化学
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Ling Yu,Yiqiao Xie,Mengxiao Liu,Lianyu Liu,Zhi Chen,Yang Yu
The wide-spread micropollutants in water have posed severe risks to human health and eco-environment. However, the current treatment techniques generally suffer from low efficiency, high cost and unpractical application feasibility. In this study, a piezoelectric membrane was fabricated by embedding zinc oxide (ZnO) nanorods with several micrometer length into polytetrafluoroethylene nanofiber membrane and applied for the removal of carbamazepine (CBZ) from water. After the sintering, the prepared membrane showed a narrower pore size distribution with the average pore size of ∼1.7 µm. The addition of ZnO nanorods could significantly improve the piezoelectric property of the membrane. During the membrane filtration, the peroxymonosulfate could be effectively activated by the prepared piezoelectric membrane with 2 % ZnO dosage to generate free radicals, achieving about 83.1 % of CBZ from water. According to the radical quenching tests and electron spin-resonance analysis, the hydroxyl radical, sulfate radical, singlet oxygen and superoxide radical greatly participated in the CBZ removal. The CBZ removal efficiency in the US/PMS/PTFE@ZnO-2 system was decreased by 18.2 % after continuous 5-cycle operation, but the performance could be easily renewed by methanol rinsing, demonstrating its attractive reusability and application potential on the efficient removal of micropollutants from water.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Xiaoyu Liu,Yuntao Hong,Shunke Ding,Wei Jin,Shengkun Dong,Rong Xiao,Wenhai Chu
Due to the spread of coronavirus disease 2019 (COVID-19), large amounts of antivirals were consumed and released into wastewater, posing risks to the ecosystem and human health. Ozonation is commonly utilized as pre-oxidation process to enhance the disinfection of hospital wastewater during COVID-19 spread. In this study, the transformation of ribavirin, antiviral for COVID-19, during ozone/PMS‑chlorine intensified disinfection process was investigated. •OH followed by O 3 accounted for the dominant ribavirin degradation in most conditions due to higher reaction rate constant between ribavirin and •OH vs. SO 4 • − (1.9 × 10 9 vs. 7.9 × 10 7 M −1 s −1 , respectively). During the O 3 /PMS process, ribavirin was dehydrogenated at the hydroxyl groups first, then lost the amide or the methanol group. Chloride at low concentrations (e.g., 0.5– 2 mg/L) slightly accelerated ribavirin degradation, while bromide, iodide, bicarbonate, and dissolved organic matter all reduced the degradation efficiency. In the presence of bromide, O 3 /PMS process resulted in the formation of organic brominated oxidation by-products (OBPs), the concentration of which increased with increasing bromide dosage. However, the formation of halogenated OBPs was negligible when chloride or iodide existed. Compared to the O 3 /H 2 O 2 process, the concentration of brominated OBPs was significantly higher after ozonation or the O 3 /PMS process. This study suggests that the potential risks of the organic brominated OBPs should be taken into consideration when ozonation and ozone-based processes are used to enhance disinfection in the presence of bromide amid COVID-19 pandemic.
研究领域:
环境科学
·
公共卫生
·
药学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）