SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yiwei Zhang,Yingjie Luo,Jie Tong,Xuesong Liu,Yong Chen,Tengfei Xu
Perfluorooctanoic acid (PFOA) is a persistent organic pollutant that poses a significant environmental threat due to its resistance to degradation in both aquatic and terrestrial environments. Ionic liquids (ILs) are a type of salt that is liquid at or near room temperature and have been widely used in separation science, as well as showing great potential in environmental applications. However, the large number and variety of ILs make them impractical to assess the suitability of all possible ILs for PFOA adsorption using purely experimental methods. To address this issue, a high-throughput machine learning method was employed in this study to screen more than a thousand ILs and identify the most appropriate molecular for designing IL based molecularly imprinted polymer (MIP) with high affinity and selectivity of PFOA. The synthesized MIP, (Vim)C 3 (L-Pro)@MIP, has been proven to effectively and specifically recognize and adsorb PFOA in water. It has a maximum adsorption capacity of 568.18 mg g −1 and removal efficiency of over 99%, making it a highly efficient and selective option for PFOA removal in environmental remediation applications. This study showcases the promising potential of integrating high-throughput computer screening with experimental verification in the initial stages of MIP material design and development. By doing so, it is possible to create MIP materials that can effectively remove various pollutants, and potentially extend to other IL doped materials and applications.
研究领域:
环境科学
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材料科学
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计算化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jian Chen,Siyuan Wang,Shuyun Wang,Rong Tang,Huan Chen
As a persistent contaminant with significant risks to environment, health and ecology, perfluorooctanoic acid (PFOA) is urgent to be treated from water. To improve the performance of commercial Ga 2 O 3 in the photocatalytic degradation of PFOA, a Bi 4 O 7 -Ga 2 O 3 composite was facilely obtained through a hydrothermal route, and characterized with diverse techniques. Batch tests were conducted to evaluate the impacts from the experimental conditions on PFOA degradation, where the Bi 4 O 7 -Ga 2 O 3 composite (GaBi10) exhibited optimized photocatalytic performance stems from the enhanced light response, improved separation of photo-generated carriers, and increased adsorption capacity, attributed by Bi 4 O 7 incorporation. Furthermore, a universal parameter, catalytic efficiency ( η ) is proposed for the quantitative comparison of photocatalytic performance across different studies, which demonstrate the outstanding performance of GaBi10 in PFOA degradation, defluorination and mineralization. The quenching tests and intermediates analysis were executed to explore the mechanism underlying the photocatalytic degradation, which indicated the degradation is initiated by h + , and other active species, ·O 2 – and ·OH, propel the mineralization of the intermediates derived from PFOA. The findings provide valuable insights for developing commercial photocatalyst and understanding photocatalytic degradation of PFOA.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Electrocatalysis
·
2025
·
IF 2.8
Yang Zehong,Wang Zihao,Qiu Qiuhong,Luo Yuzhan,Wang Chenglong,Huang Yaobin,Zhuang Tao,Zheng Weijin,Chen Liang,Lan Liying,Liu Guangli,Fang Jiasheng,Li Yanliang,Lv Sihao,Wang Wenlong,Qiu Yongfu,Zhuo Qiongfang
A Sn/ZnO 2 @Ti 4 O 7 anode was prepared using a combination of hydrothermal synthesis and discharge plasma sintering methods for the electrochemical degradation of perfluorooctanoic acid (PFOA). The introduction of Sn/ZnO 2 significantly increased the electrochemical active surface area (ECSA) and the oxygen evolution potential (OEP) of Ti 4 O 7 . A 97.6% degradation rate of PFOA can be achieved using a Sn/ZnO 2 @Ti 4 O 7 anode, at a current density of 40 mA/cm 2 , with the initial PFOA concentration of 10 mg/L, at a pH value of 5.69, and within 120 min. Radical quenching experiments indicated that direct oxidation was the main mechanism for PFOA degradation, contributing 82.5%. The degradation efficiencies of PFOA remained above 88% in Dongjiang and Zhujiang rivers (DJR and ZJR) matrixes, confirming the system’s resistance to complex matrix. The total organic carbon (TOC) removal ratio was 56.8%, and the defluorination ratio was 48% after electrolysis of 6 h. After 36 cycles of degradation, the degradation rate was 95.6%. The toxicity assessments indicated that the degradation intermediates were significantly less toxic than the parent PFOA. Graphical
研究领域:
环境科学
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电化学
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水处理
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污染物降解
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Changduo Sun,Min Yu,Yuting Li,Bihui Niu,Fenghui Qin,Na Yan,Yinyin Xu,Yian Zheng
Calotropis gigantea fiber (CGF) is a natural cellulose fiber with thin-walled large lumen. Benefitted from its unique structure, CGF was utilized here as a bio-template for the fabrication of hollow carbon microtubes using a facile hydrothermal method , and simultaneously, nano-sized MoS 2 flowers were in-situ generated along the inner and outside surfaces of carbonized fiber microtubes, forming MoS 2 nanoflowers decorated biochar MoS 2 /CGB. Coupled with dual active centers from non-metallic biochar and metallic MoS 2 , MoS 2 /CGB was then used for activating peroxymonosulfate (PMS) to degrade perfluorooctanoic acid (PFOA), one emerging pollutant that had received wide attention in recent years. The experimental results indicated that at room temperature and pH 3.0, MoS 2 /CGB exhibited the degradation efficiency of 79.6% for PFOA, and removal percentage of 50.7% for total organic carbon . During the degradation process, the free radical (SO 4 •− /•OH) and non-radical ( 1 O 2 ) routes coexisted, and the amount of SO 4 •− was about 9 times that of •OH. Combined with mass spectrometry , the possible degradation pathway of PFOA was proposed as transforming into short chained C2- to C5-containing carboxylic acids. With Vibrio fischeri as an indicator, the acute toxicity of PFOA solution and intermediates was evaluated, with the inhibition rate decreased from 27.6% to 4.5%. Finally, MoS 2 /CGB had the ability not only for removing perfluorinated compounds with different carbon chain lengths, but also for catalytically degrading PFOA in tap water and Yellow River water . This work provides plant fiber-based sustainable catalyst for potential application in PMS-based system for boosting PFOA degradation.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Scientific Reports
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2014
·Vol. 4
·期 1
·1-6
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IF 5.078
Zhang Ze,Chen Jie-Jie,Lyu Xian-Jin,Yin Hao,Sheng Guo-Ping
Decomposition of perfluorooctanoic acid (C 7 F 15 COOH, PFOA) has been gaining increasing interests because it is a ubiquitous environmental contaminant and resistant to the most conventional treatment processes. In this work, the rapid and complete mineralization of PFOA and simultaneous defluorination were achieved by γ-ray irradiation with a 60 Co source. The degradation rate of PFOA by γ-ray irradiation would be high and a pseudo-first-order kinetic rate constant of 0.67 h −1 could be achieved in the N 2 satured condition at pH 13.0. The experimental results and quantum chemical calculation confirmed that two radicals, i.e., hydroxyl radical (·OH) and aqueous electrons (e aq − ), were responsible for the degradation of PFOA, while only either e aq − or ·OH might not be able to accomplish complete mineralization of PFOA. The synergistic effects of ·OH and e aq − involved in the cleavage of C-C and C-F bonds and therefore complete mineralization of PFOA were achieved. The intermediate products were identified and the degradation pathway was also proposed. The results of this study may offer a useful, high-efficient approach for complete mineralizing fluorochemicals and other persistent pollutants.
研究领域:
环境化学
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放射化学
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污染物降解
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量子化学计算
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水处理技术
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Junjie Li,Liang Li,Jing Zhang,Chun Yang,Jun Ma
Perfluorooctanoic acid (PFOA), as an anthropogenic persistent contaminant, is widely distributed in the natural aquatic environment and has been a considerable threat to ecological security and human health. In this work, we propose and evaluate the vacuum ultraviolet (VUV)/sulfite-iodide system under N 2 saturated condition for the decomposition of PFOA. The in situ generated hydrated electrons (e aq − ) were demonstrated to be the main active species responsible for the PFOA degradation. With observation of the intermediate products, two major degradation pathways of PFOA in VUV/sulfite-iodide system were proposed: H/F exchange and chains shortening. A significant enhancement of PFOA defluorination was observed with increasing pH values from 9.0 to 12.0, which can be explained by the decreasing quenching effect of e aq − and accelerated disproportionation of I 2 to I − and IO 3 − . Meanwhile, VUV/sulfite-iodide system also exhibited satisfactory performance in degrading high concentration of PFOA (200 μM). However, the presence of Cl − , NO 3 − , and humic acid inhibited the removal of PFOA via various reaction mechanism. The VUV/sulfite-iodide system was effective toward the chosen PFCAs (trifluoroacetic acid (TFA) and perfluorobutyric acid (PFBA)), demonstrating a chain length independence on the degradation of PFCAs, supporting its broad applicability.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
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2022
·
IF 9.988
Xinyi Qin,Yuan Zhuang,Juan Ma,Sijin Liu,Baoyou Shi
Iron particles present in drinking water distribution systems (DWDSs) could cause discoloration, while organic pollutants in DWDSs, such as perfluorooctanoic acid (PFOA), could be enriched by iron particles. However, little is known about the enhanced effects of PFOA and iron particles in DWDSs. To fill in these knowledge gaps, herein, iron-PFOA (FEP) particles were generated using residual chlorine as an oxidant in drinking water conditions and then separated into different sizes (ranging from small to large: FEP-S, FEP-M ，and FEP-L). FEP-S harbored the greatest cytotoxicity among the sizes. Interestingly, our data revealed that the PFOA released from FEP particles transformed into PFOS (perfluorooctane sulfonate) upon digestion in the gastrointestinal environment (GI), and FEP-L bored the strongest transformation, showing a toxicity profile that was distinct from that of FEP-S. Furthermore, mechanistic studies revealed that FEP per se should be accountable for the conversion of PFOA to PFOS dependent on the generation of hydroxyl radicals (·OH) in GI, and that FEP-L revealed the greatest production of ·OH. Collectively, these results showed how iron particles and PFOA could result in enhanced toxicity effects in drinking water: (i) PFOA could increase the toxicity of iron particles by reducing particle size and inducing higher generation of ·OH; (ii) iron particles could induce the transformation of PFOA into more toxic PFOS through digestion.
研究领域:
环境科学
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毒理学
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公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Wenkai Li,Lu Li,Biqing Li,Lai Peng,Yifeng Xu,Renhui Li,Kang Song
Perfluorooctanoic acid (PFOA) as nonbiodegradable organic pollutant, its presence and risks in wastewater treatment system has aroused wide concern. This study investigated the effect and underlying mechanism of PFOA on anaerobic digestion sludge (ADS) dewaterability. Long-term exposure experiments were set up to investigate the effect with various concentration of PFOA dosed. Experimental results suggested that the existence of high concentration PFOA (over 1000 μg/L) could deteriorate ADS dewaterability. The long-term exposure to 100,000 μg/L PFOA of ADS increased specific resistance filtration (SRF) by 81.57%. It was found that PFOA promoted the release of extracellular polymeric substances (EPS), which was strongly associated with sludge dewaterability. The fluorescence analysis revealed that the high PFOA concentration could significantly improve the percentage of protein-like substances and soluble microbial by-product-like content, and then further deteriorated the dewaterability. The FTIR results showed that long-term exposure of PFOA caused loose protein structure in sludge EPS, which led to loose sludge floc structure. The loose sludge floc structure aggravated the deterioration of sludge dewaterability. The solids-water distribution coefficient (K d ) decreased with the increase of initial PFOA concentration. Moreover, PFOA significantly affected microbial community structure. Metabolic function prediction results showed significant decrease of fermentation function exposed to PFOA. This study revealed that the PFOA with high concentration could deteriorated sludge dewaterability, which should be highly concerned.
研究领域:
环境科学
·
废水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Shu-Fan Li,Tong-Tong Liu,Lang-Jie Ye,Jian Su,Gen Zhang
The regulation of metal–organic framework (MOF) structures for the enhanced removal of perfluoroalkyl and polyfluoroalkyl substances remains a significant challenge. Herein, employing a topology regulation strategy, we synthesized two Zr-MOFs composed of identical inorganic and organic components and investigated their removal efficiency with perfluorooctanoic acid (PFOA). The resultant Zr-MOF-1, characterized by the sqc topology, demonstrated an absorption capacity for PFOA nearly five times greater than that of Zr-MOF-2, which featured the scu topology. The adsorption capacity of Zr-MOF-1 for PFOA reached 335.4 mg/g, attributed to a synergistic mechanism encompassing both chemical and physical absorption. This study illuminates the precise regulation of the absorption performance by structural frameworks.
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
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Zhen Cheng,Lingling Du,Panpan Zhu,Qian Chen,Kejun Tan
Because of the serious harm to animals and the environment associated with perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), a rapid, sensitive and low-cost method for detecting PFOS and PFOA is of great importance. In this paper, a novel sensing method has been proposed for the highly sensitive detection of PFOS and PFOA in environmental water samples based on the “turn-on” switch of erythrosine B (EB)-hexadecyltrimethylammonium bromide (CTAB) system. In pH 8.55 Britton-Robinson (BR) buffer, EB can react with CTAB by electrostatic attraction, resulting in a strong fluorescence quenching of EB. With a subsequent addition of the CTAB, a red-shift occurred (11 nm), followed by a significant increase in fluorescence at high surfactant concentrations. It was found that PFOS and PFOA can obviously enhance fluorescence intensity of EB-CTAB system. The enhanced fluorescence intensity is proportional to the concentration of PFOS and PFOA in the range of 0.05–10 μM with detection limit of 12.8 nM and 11.8 nM (3σ), respectively. The presented assay has been successfully applied to sensing PFOS and PFOA in real water samples with RSD ≤ 4.3% and 2.9%, respectively.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HYDROLOGY
·
2022
·
IF 6.708
Xueyan Lyu,Zhengyu Li,Dengjun Wang,Qi Zhang,Bin Gao,Yuanyuan Sun,Jichun Wu
Per– and polyfluoroalkyl substances (PFAS) contamination is ubiquitous and likely co–exist with hydrocarbon surfactants in the subsurface environment. The transport of PFAS in unsaturated porous media (quartz sand–packed columns) with an anionic hydrocarbon surfactant was investigated using perfluorooctanoic acid (PFOA) and sodium dodecyl benzene sulfonate (SDBS) as representative PFAS and hydrocarbon surfactant at 1.5 and 30 mM NaCl, respectively. Our results show that SDBS inhibited the retardation of PFOA during transport. The degree of the inhibited retardation was more significant at higher concentration of SDBS ( C SDBS ) for a given concentration of PFOA ( C PFOA ) and higher ionic strength. In contrast, PFOA only marginally affected the transport of SDBS under all tested conditions. This is mainly due to the greater surface activity of SDBS with respect to PFOA, favoring the competitive preferential adsorption of SDBS at the air–water interface and then the transport of PFOA in the unsaturated sand. This assumption is further supported by the greater air–water adsorption coefficient ( K ai ) and surface excess ( Γ ) for SDBS than those for PFOA, as well as the surface tension isotherms that fairly weighted toward to SDBS in the binary PFOA–SDBS system. Our findings indicate the critical role of anionic hydrocarbon surfactant in retarding PFOA transport in unsaturated zone. This should be considered when assessing the transport potential and environmental risk, and developing remedial strategies of PFAS in the subsurface environment.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Wenjing Wang,Zhenlan Xu,Xiaoxia Zhang,Andreas Wimmer,En Shi,Yang Qin,Xueping Zhao,Baocheng Zhou,Lingxiangyu Li
Organic micropollutants (OMPs), including both regulated and emerging contaminants, have been extensively detected in ground and surface waters, posing hazards to organisms and humans. Rapid and efficient removal of OMPs from environmental water by novel sorbents is still faced with severe challenges. Here we developed a magnetic nanoparticles-attached fluorographene-based (MNPs@FG) sorbent with high affinity to OMPs such as perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) compared to powdered activated carbon, the most widespread sorbent for OMPs removal. The removal efficiencies of PFOA and PFOS using the MNPs@FG sorbent were systematically examined at room temperature. The MNPs@FG sorbent showed 92–95% and 94–97% removal efficiencies of PFOA (180 μg/L) and PFOS (180 μg/L) in 2 min respectively, with relatively high sorption capacities for PFOA (50.4 mg/g) and PFOS (17.2 mg/g). The adsorption performance was stable even in the presence of natural organic matter. Moreover, the MNPs@FG sorbent could notably reduce PFOA and PFOS from ∼5 μg/L (an environmentally relevant concentration) to <50 ng/L in environmental water, lower than the U.S. Environmental Protection Agency health advisory level (70 ng/L). Besides PFOA and PFOS, the MNPs@FG sorbent also showed high removal efficiencies (97–99%) of difloxacin hydrochloride (DIF), acetochlor (ACE) and chlorantraniliprole (CHL) in short time (e.g. 10 min). The used MNPs@FG sorbent was facilely regenerated by methanol washing and reused five times without reduction in PFOA/PFOS removal and magnetic performance. Thus, this study provided a novel sorbent for rapid and effective removal of OMPs from environmental water.
研究领域:
环境科学
·
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）