Journal of Environmental Sciences
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2019
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IF 3.556
Li Long,Xiaolan Hu,Jinpeng Yan,Yifan Zeng,Jiaqi Zhang,Yingwen Xue
It is urgent to explore an effective removal method for perfluorooctanoic acid (PFOA) due to its recalcitrant nature. In this study, a novel chitosan-based hydrogel (CEGH) was prepared with a simple method using chitosan and ethylene glycol through a repeated freezing–thawing procedure. The adsorption of PFOA anions to CEGH agreed well to the Freundlich–Langmuir model with a maximum adsorption capacity as high as 1275.9 mg/g, which is higher than reported values of most adsorbents for PFOA. The adsorption was influenced by experimental conditions. Experimental results showed that the main removal mechanism was the ionic hydrogen bond interaction between carbonyl groups (COO − ) of PFOA and protonated amine (NH + ) of the CEGH adsorbent. Therefore, CEGH is a very attractive adsorbent that can be used to remove PFOA from water in the future.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Jing Li,Qian Li,Lu-shuang Li,Li Xu
Perfluoroalkyl and polyfluoroalkyl substances are priority contaminants of global concern. It is urgent to remove them from the environment. Adsorption is an efficient approach, but the adsorption capacity and regeneration of adsorbent were not satisfactory. In the present study, mesoporous melamine-formaldehyde resin microsphere (MMFRS) was fabricated through suspension polymerization. Owing to its mesoporous property and large anion-exchange capacity of 0.3 mmol/g, MMFRS was applied to the adsorption of perfluorooctanoic acid, a model target. The sorption kinetics obeyed pseudo-second-order equation and the sorption isotherms fitted both Freundlich and Langmuir models well. MMFRS exhibited a superiority over commercial powdered activated carbon on the adsorption amount. The sorption could reach equilibrium within 24 h. In addition, the material could be easily and economically regenerated by dilute NH 3 ·H 2 O (7.5 mM); a regeneration percentage (>85%) after 20 recycles was obtained. This study provides a facile, environmentally-friendly and low energy-consumption strategy for removal of perfluorooctanoic acid from aqueous solution in waste-water treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Water
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2022
·Vol. 14
·期 7
·1010
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IF 3.53
Gaoxi Liu,Xiaohui Wei,Peiru Luo,Shuyu Dai,Wenfen Zhang,Yanhao Zhang
The mobility, durability, and widespread use of perfluorinated and polyfluoroalkyl substances (PFAS), notably perfluorooctanoic acid (PFOA), bring about serious contamination of many ground and surface waters. In this study, fluorine and amine-functionalized porous organic polymer (POP-4F) was designed and successfully synthesized as an adsorbent for PFOA removal in water. The characterization results showed that the synthesized material had an amorphous microporous structure, and the BET surface area was up to 479 m2g−1. Its versatile adsorption property was evaluated by batch adsorption experiments using PFOA as a probe. The experiments show that the polymer was able to remove 98% of the PFOA in 5 min from water and then desorb within 3 min in methanol ([PFOA]0= 1 mg L−1; [POP-4F] = 200 mg L−1). Specifically, the adsorption capacity of POP-4F is up to 107 mg g−1, according to the Langmuir fit. The rapid adsorption and desorption of PFOA by POP-4F offers the possibility of economical, environmentally friendly, and efficient treatment of real wastewater.Keywords:perfluoro octanoic acid;porous organic polymer;adsorption removal
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 LUMINESCENCE
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2015
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IF 2.719
Qi Liu,Aizhen Huang,Nan Wang,Guan Zheng,Lihua Zhu
Analysis of perfluorooctanoic acid (PFOA) usually requires a combination of high-performance liquid chromatography and mass spectrometry , which is expensive and time-consuming. In the present work, water-soluble CdS quantum dots (QDs) were employed to develop a simple and rapid fluorometric method for the determination of PFOA. Strongly fluorescent CdS QDs were prepared by using 3-mercaptopropionic acid (MPA) as a stabilizer . It was observed that PFOA strongly quenched the fluorescence emission of the MPA-CdS QDs because PFOA promotes the aggregation of MPA-CdS QDs through a fluorine–fluorine affinity interaction. Under optimum conditions, the fluorescence intensity of MPA-CdS QDs was observed to decrease linearly with an increase in the concentration of PFOA from 0.5 to 40 μmol L −1 , with a limit of detection of 0.3 μmol L −1 . This new method was successfully implemented for the analysis of PFOA-spiked textile samples, with recoveries ranging from 95% to 113%.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
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2016
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IF 3.698
Lina Zhou,Mengjie Xia,Li Wang,Hui Mao
As a persistent organic pollutant in the environment, perfluorooctanoic acid (PFOA) has been extensively investigated. It can accumulate in food chains and in the human body. This work investigated the effect of PFOA on wheat ( Triticum aestivum L.) germination and seedling growth by conducting a germination trial and a pot trial. A stimulatory effect of PFOA on seedling growth and root length of wheat was found at <0.2 mg kg −1 , while >800 mg kg −1 PFOA inhibited germination rate, index, and root and shoot growth. In the pot trial, PFOA concentration in root was double that in the shoot. Soil and plant analyzer development (SPAD) and plant height of wheat seedling were inhibited by adding 200 mg kg −1 PFOA. Proline content and POD activity in wheat seedlings increased as PFOA increased, while CAT activity decreased. Using logarithmic equations, proline content was selected as the most sensitive index by concentration for 50% of maximal effect (EC 50 ). Hence, the tolerance of wheat seedlings to PFOA levels could be evaluated on the basis of the physiological index.
研究领域:
环境科学
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植物生理学
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DOI
PubMed
高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Wenli Yao,Mingzhe Li,Changduo Sun,Yanlong Liu,Mengling Ma,Fengjuan Chen,Lei Zhou,Yian Zheng
Removal of perfluorinated compounds (PFCs) from the environment is a major challenge due to their refractory, persistent and bioaccumulative properties. In this study, trace Co coupled via Co–P coordination and tourmaline (TM) doped g-C 3 N 4 was fabricated (marked as Co/TM/g-C 3 N 4 ) and used as the catalyst for activating peroxymonosulfate (PMS) to remove emerging PFOA under visible light irradiation. Several affecting parameters were systematically investigated, inlcuding Co/TM/g-C 3 N 4 dosage, PMS concentration, initial pH, as well as coexisting Cl − , HC O 3 − , H 2 P O 4 − , N O 3 − and humic acid . Under the conditions of 0.5 g/L Co/TM/g-C 3 N 4 , 2.5 g/L PMS and pH 3.0, the developed synergistic system had the ability for 81.11% removal of PFOA within 4 h, 67.64% removal after the fourth run, and also could be effectively applied in actual water bodies. During the degradation process , π-π*, N–C N and graphite N played the vital role, with the final defluorination rate of 31.12% at 4 h. Free radical quenching and quantitative analysis, as well as electron paramagnetic resonance was used to verify the free radical and non-free radical pathways for PFOA removal, with the findings that S O 4 • − (2.61 μM at 1 h), •OH (0.067 μM at 4 h), O 2 • − , h + , and O 1 2 were involved with possible time-dependent. By liquid chromatography-mass spectrometry analysis, the short-chain intermediates of C3–C7 were proposed and identified. From this study, trace Co coupled and TM doped g-C 3 N 4 demonstrated higher catalytic potential to activate PMS for visible-light synergistic PFOA removal, with the expectation of achieving a cleaner water environment for human beings.
研究领域:
环境科学
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催化材料
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Kaihang Zhang,John C. Crittenden
Perfluorooctanoic acid (PFOA) pollution in aqueous environments has become a matter of significant concern due to its adverse effects on the environment and ecosystems. In the pursuit of an efficient PFOA removal method, ion exchange membranes have been employed as adsorbents using the electrosorption technique. This study investigates the electrosorption capacity of PFOA, focusing on factors such as the types of ion exchange membranes, applied potential, residual time, and PFOA concentration. Among the various membranes tested, the polyvinylidene chloride membrane with quaternary ammonium groups demonstrated an impressive 92.5 % removal ratio under an initial concentration of 100 ppm. However, the desorption of PFOA poses a challenge due to its surfactant nature and the strong electrostatic interaction with the quaternary ammonium groups on the membrane surface. Our research findings indicate that using a protic CH 3 OH solution with NaCl enables efficient PFOA desorption. Additionally, the membrane exhibits a remarkable retention of 99.2 % capacity over five electrosorption-desorption cycles. In conclusion, the innovative electrosorption-desorption methods presented in this study offer a promising direction for effective PFOA removal.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2024
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IF 6.2
Xing Zhang,Yifei Kong,Zihan He,Wenbin Yu,Wenjing Shao,Chengliang Gong,Wenlin Zhou,Xiaolong Hu
Perfluorooctanoic acid (PFOA) and tetrabromobisphenol A (TBBP-A) are emerging environmental contaminants with recognized potential health and ecological risks. This study investigated the effects of PFOA and TBBP-A exposure on the global of metabolites of silkworm gut with GC-MS metabolomics. Our results revealed distinct metabolic alterations in silkworms exposed to PFOA and TBBP-A, highlighting their differential impacts on silkworm health and productivity. Exposure to these chemicals significantly altered metabolic profiles, leading to disruptions in pathways related to lipid, carbohydrate, and amino acid metabolism. These findings suggest that PFOA and TBBP-A disrupt crucial metabolic processes in silkworms, indicating potential toxicity and prompting further investigation into their effects on human health and the environment. Ongoing research is crucial to develop safer alternatives and mitigate the risks associated with these persistent contaminants.
研究领域:
环境科学
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昆虫学
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代谢生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Guanhong Liu,Chao Li,Brittney Ashley Stewart,Lin Liu,Meng Zhang,Mingyang Yang,Kuangfei Lin
The chemical degradation performance of perfluorooctanoic acid (PFOA), one of the environmentally persistent contaminants, by fresh activated carbon (FAC) and nitrogen-doped activated carbon (NAC) which were used as heterogeneous catalysts in the presence of thermal activating peroxymonosulfate (PMS) were investigated and compared. In this study, the physicochemical properties of FAC and NAC are characterized by scanning electron microscope, Raman spectra, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, and Brunauer Emmett Teller. Furthermore, the dosing amount of catalyst, the concentration of oxidant and the effect of catalytic oxidation are investigated. During the catalytic oxidation process, the concentrations of PFOA and its degradation products are determined by high-performance liquid chromatography combined with tandem mass spectrometry (HPLC-MS/MS). The mineralization efficiency of PFOA employing FAC and NAC coupled with thermal activation of PMS are evaluated via a combination approach of total organic carbon (TOC) and ion chromatography (IC). The results indicate that PFOA can be readily degraded at 60 °C with an optimum concentration of PMS and an appropriate dosage of FAC/NAC. During the degradation process FAC and NAC exhibit superior adsorption and catalytic performance as more acidic oxygen functional groups are obtained from surface modification, which can facilitate the decomposition of PMS and the mineralization of PFOA. Electron paramagnetic resonance detection confirms that both OH and SO 4 − exist during oxidation. Based on the identified products, a reaction pathway including adsorption, hydroxylation, and catalytic oxidation is proposed. The methods could not only be applied in a wide pH range to effectively remove PFOA, FAC/PMS and NAC/PMS could also be reused, which provide a feasible and cost-effective method for the degradation of PFOA in situ actual ground water remediation.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
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2015
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IF 4.143
Xinping Yang,Chengchen Ye,Yu Liu,Fang-Jie Zhao
Perfluorooctanoic acid (PFOA) is widely used in the manufacture of many industrial and household products. To assess the potential environmental risk of PFOA, its accumulation, translocation and phytotoxic effects were investigated using the model plant species Arabidopsis thaliana . Exposure to 18 μM PFOA-F in agar plates did not affect plant growth, but 181–1811 μM PFOA-F inhibited root and shoot growth. PFOA was more phytotoxic on shoot growth than NaF at the equivalent F concentration, with the latter having 3.9–7.6 times higher EC50 for shoot biomass than PFOA. PFOA was efficiently translocated from roots to shoots, where it existed as intact PFOA molecules without transformation evidenced by the 19 F NMR spectra. PFOA caused a significant increase in the concentration of H 2 O 2 and malondialdehyde (MDA) in shoots, indicating that oxidative stress is a likely cause of PFOA phytotoxicity.
研究领域:
植物学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Emerging Contaminants
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2016
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IF 0
Bo Yang,Yanni Han,Yunpan Deng,Yingying Li,Qiongfang Zhuo,Jinhua Wu
Electrocoagulation (EC) technique was used to investigate the removal performance of aqueous perfluorooctanoic acid (PFOA) with relatively high concentration as simulating the wastewater from organic fluorine industry. A comparison was done with the similar amount of coagulant between EC and chemical coagulation process. PFOA removal obtained was higher with EC process, especially for Fe anode. Several factors were studied to optimize the EC process. At the optimal operating parameters including 37.5 mA/cm 2 of current density, initial pH 3.77, and 180 rpm of mixing speed, 93% of PFOA could be removed with 100 mg/L of initial concentration after 90-min electrolysis. Furthermore, the remove efficiency could be obviously improved by H 2 O 2 intermittent addition, which removed more than 99% of PFOA within 40-min EC. It could be attributed to that H 2 O 2 facilitated the oxidative transformation from ferrous to ferric ion. In addition, the adsorptive removal of aqueous PFOA on Fe flocs during EC was also verified by fourier transform infrared spectra.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
Journal of Water Process Engineering
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2024
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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
危险品化学品经营许可证（带存储）