Journal of Water Process Engineering
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2024
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IF 6.3
Jinfeng Zhao,Yuntong Fan,Jiaqi Zhangle,Congcong Ni
Perfluorooctanoic acid (PFOA) is a persistent organic pollutant found in various industrial effluents, posing significant environmental and health risks. Electrosorption of PFOA on MXene-polyaniline film from water was studied. The results of electrosorption kinetics showed that the functionalized MXene film with polyaniline resulting in an approximately 100 % increase in electrosorption capacitance for PFOA due to increasing of the MXene film's volumetric capacitance and modifying of surface chemistry of MXene. The maximum adsorption of PFOA on MXene and MXene-polyaniline films were 358.5 mg/g and 966.1 mg/g, respectively, at an initial concentration of 100 mg/L upon application of +1.0 V. Moreover, humic acid (HA) competing with the adsorption sites, sodium chloride through the double-layer compression effect, and pH affecting the amine or amide functional groups on MXene-polyaniline which inhibited PFOA adsorption onto MXene-polyaniline film were thoroughly examined. Lastly, the reversible adsorption–desorption cycles show that the MXene–polyaniline film possesses the potential to be used continuously. To address PFAS pollution in water sources, we think our approach can help build effective and long-lasting technology.
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
DESALINATION
·
2024
·
IF 8.3
Lei Huang,Lei Sheng,Kuilin Wan,Meicong Wang,Hongguo Zhang,Jia Yan,Yonghui Liu,Sikpaam Issaka Alhassan,Yongsheng Chen,Samuel Raj Babu Arulmani
Fluoride is a common pollutant from nature, normal life, and production. Adsorption, electro-adsorption, and precipitation are dominant mechanisms corresponding to the adsorption and electro-adsorption technologies for removing fluoride. This paper presents Ti 3 AlC 2 as an effective reagent for removing fluoride under acidic conditions. The adsorption mechanisms of adsorption and electro-adsorption were compared to sedimentation at pH 2 and 1, leading to a higher removal rate of adsorption by pH 2 than at pH 1. The adsorptive behavior of Ti 3 AlC 2 with fluoride includes both multilayer sorption and chemisorption. Furthermore, the precipitation reaction induced a partial change of Ti 3 AlC 2 to MXene. Notably, electro-adsorption was more effective rather than sedimentation at pH 1 in capacitive deionization technology. The Al adsorption sites made it easier to combine fluoride than Ti, and aluminum fluoride was easier to produce than titanium (III) fluoride. These adsorption and electro-adsorption experiments were carried out to elucidate and delineate the performance of Ti 3 AlC 2 for removing fluoride. A molecular model of Ti 3 AlC 2 was also built to calculate adsorption using the density functional theory. Hence, the Ti 3 AlC 2 molecular model combined with XPS and other characterizations of materials provided an effective, easy-to-understand combinative mechanism for removing fluoride.
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
Processes
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2022
·Vol. 10
·期 11
·2330
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IF 3.352
Wei Wang,Kerui Li,Ge Song,Minghua Zhou,Peng Tan
In this study, carbon aerogels (CAs) were synthesized by the sol-gel method, using environmentally friendly glucose as a precursor, and then they were further activated with potassium hydroxide (KOH) to obtain activated carbon aerogels (ACAs). After the activation, the electrochemical performance of the ACAs was significantly improved, and the specific capacitance increased from 19.70 F·g−1to 111.89 F·g−1. Moreover, the ACAs showed a stronger hydrophilicity with the contact angle of 118.54° compared with CAs (69.31°). When used as an electrode for capacitive deionization (CDI), the ACAs had not only a better diffuse electric double layer behavior, but also a lower charge transfer resistance and intrinsic resistance. Thus, the ACA electrode had a faster CDI desalination rate and a higher desalination capacity. The unit adsorption capacity is three times larger than that of the CA electrode. In the desalination experiment of 100 mg·L−1sodium chloride (NaCl) solution using a CDI device based on the ACA electrode, the optimal electrode spacing was 2 mm, the voltage was 1.4 V, and the flow rate was 30 mL·min−1. When the NaCl concentration was 500 mg·L−1, the unit adsorption capacity of the ACA electrode reached 26.12 mg·g−1, much higher than that which has been reported in many literatures. The desalination process followed the Langmuir model, and the electro-sorption of the NaCl was a single layer adsorption process. In addition, the ACA electrode exhibited a good regeneration performance and cycle stability.Keywords:carbon aerogel;activation;capacitive deionization;desalination;electro-sorption
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·Vol. 333
·期 10
·5151-5159
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IF 1.5
Cao Meng,Chen Liman,Chen Jiaqi,Gui Yunyang,Liu Peng,Yan Yongde,Xue Yun
As an energy-saving and facile technology, electrosorption technology has good potential in the process of separation of uranium from aqueous solution. In this study, sucrose and urea were used to prepare nitrogen-doped carbon by one-step carbonization, and polyacrylamide modified nitrogen doped carbon (PAM/NC) was obtained by modification. The electrosorption test results indicated that PAM/NC-2 had the best properties and the maximum electrosorption capacity was 619.5 mg g −1 . The performance loss was less than 20% after 5 adsorption–desorption cycles. Overall, this material had a potential application in U(VI) pollution remediation, meeting the need for sustainable development of nuclear energy.
研究领域:
材料科学
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环境科学
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核能技术
✓ 已验证
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
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jie Huang,Bin Huang,Tianxiang Jin,Zhirong Liu,Dejuan Huang,Yong Qian
The extraction of U(VI) from nuclear wastewater is of great importance for environmental protection. In this work, we try to remove uranium ions from uranium-containing wastewater by electrosorption. In order to improve the adsorption capacity and selectivity of the adsorption materials, the complex of chitosan and phytic acid (CSPA) was used as electrode material. The experimental results showed that the introduction of phytic acid can efficiently improve the adsorption capacity, adsorption selectivity and reusability of chitosan. The maximum adsorption capacity of CSPA was 429.1 mg/g and the theoretical maximum sorption capacity reached up to 572.1 mg/g. Moreover, the electrosorption capacity of CSPA for U(VI) was 68.6% of the total electrosorption capacity in the presence of competitive ions. After 5 cycles of reuse, CSPA still maintained 86.6% of its initial sorption capacity. Furthermore, we found that the selective adsorption mechanism of uranium ions was related to the inner-sphere complexation between UO 2 2+ and the O atom of P O group according to the experimental analysis and the DFT calculation results. This work provided a novel strategy for effective removal of uranium (VI) from uranium-containing wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2019
·Vol. 23
·期 8
·2377-2390
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IF 2.531
Wang Shuangshuang,Feng Jianwei,Meng Qinghan,Cao Bing,Tian Guiying
The search for highly efficient carbon materials with high desalting capacity for the brackish water desalination is still indispensable. In this study, boron and nitrogen co-doped graphene xerogels are prepared by a simple sol-gel method with atmospheric drying and carbonization, in which the rod-like primary particles are attached on the graphene sheets via crosslinking reaction of boric acid-melamine-resorcinol-formaldehyde (BMRF). With the increase in doping ratio, the carbonized BMRF gels display high micropore surface area and abundant doping sites. The maximum doping contents of boron (1.54 at.%) and nitrogen (8.72 at.%) can be achieved in the co-doped graphene xerogel with the molar ratios of C 6 H 6 O 2 and H 3 BO 3 of 1.2, which displays superior specific capacitance (242 F g −1 at a current density of 0.1 A g −1 ) and high capacitance retention (92.7% after 5000 cycles at a current density of 2.0 A g −1 ). The co-doped graphene xerogels are evaluated as electrode materials for the electrochemical desalination of brackish water. Compared to the bare graphene xerogel, the co-doped graphene xerogel displays high electrosorption capacity of 18.45 mg g −1 and high charge efficiency of 45% for NaCl solution under an applied voltage of 1.6 V.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
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2025
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IF 9.8
Lingzi Liu,Junsheng Wu,Zelin Wang,Jianyun Liu,Xiaowei Sun,Hao Wang
A 3-channel cell structure for capacitive deionization (CDI) process has been proposed and tested in this study. A great improvement in electrosorption performance has been achieved with this novel cell design. Using a NaCl aqueous solution with a conductivity of 3000 μS/cm as the feed stream, a desalination rate of 85 % was obtained with a water recovery of 90 %. The 3-channel design enabled the electrosorption process proceeded in an almost continuous fashion, greatly enhancing the cell utilization efficiency and lowering capital costs in the practical desalination system. In addition, the introduction of an electrode chamber flow renders the electrosorption process suitable for higher-concentration feed solutions, effectively overcoming the concentration limitations typically faced by traditional CDI systems. In the practical application, the system was tested for the desalination of desulfurization wastewater from power plants, achieving over 90 % ion removal, with total hardness decreased by 96.1 % in a continuous test. This study highlights the potential of the 3-channel CDI design for large-scale applications, especially for high salinity wastewater treatment, providing new insights into advancing electrosorption technology for challenging water treatment scenarios.
研究领域:
环境科学
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水处理技术
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产品关联
DOI
高影响因子
CARBON
·
2017
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IF 6.337
Yang Li,Jiaming Shen,Jiansheng Li,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang
Capacitive deionization (CDI) with high energy efficiency, low cost, and non-secondary pollution is considered an emerging desalination technology. To pursue excellent electrode materials with high electrosorption capacity is highly desired for practical CDI application. In this work, the protic salt-derived porous carbon was synthesized via the direct pyrolysis of the protic salt, i.e., p -phenylenediamine bisulfate ([pPDA][2HSO 4 ]), which was obtained by simply neutralizing p -phenylenediamine with sulfuric acid. The resultant carbon materials possessed large specific surface area, high nitrogen doping, good graphitization and large mesopores. These intrinsic characteristics endowed protic salt-derived porous carbon with excellent electrochemical properties and CDI desalination performance. Particularly, the carbon obtained at 900 °C (C-9) with optimal porous structure (1082 m 2 g −1 ) and chemical composition (5.2% N) exhibited the best electrochemical property with a specific capacitance of 222.3 F g −1 . The CDI results showed that C-9 had a high electrosorption capacity of 16.5 mg g −1 in 100 mg L −1 NaCl solution and excellent electrosorption stability over 20 times of adsorption-desorption cycles. Furthermore, we demonstrated the dependence of CDI performance on the balance between porous structure and chemical composition. These results imply that the protic salt-derived porous carbon should be a promising electrode material for CDI application.
研究领域:
材料科学
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环境工程
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电化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Chunxia Pang,Haijun Wang,Xiaoyan Lin
Atmospheric particulate matter (PM) pollution is a serious threat to human health, so the preparation of electret films with high efficiency and low resistance capturing particulate has attracted wide attention. Herein, a strategy for the fabrication of all-polymer hybrid electret fiber membranes by electrospinning is reported based on the ethyl cellulose (EC) and polystyrene (PS). The preparation conditions of electret fiber membrane were optimized by focusing on the effect of the mass ratio of EC/PS and the spinning time on the structure, surface potential and purification performance of fiber membrane. The result showed that the fiber membrane has a low fiber diameter of 572 ± 113 nm and porosity of 82.4%, and a better potential stability when the EC/PS mass ratio was 2.5/1 and the spinning time was 10 min. As a result of the enhanced effect of electrostatic attraction on particle capture, the EC/PS composite electret membrane could make the purification efficiency of PM2.5 reach to100% within 11 min. Moreover, the EC/PS composite electret membrane has the properties of ultra-light base weight of 1.08 g·m −2 , low air resistance of 28 Pa and long service life. Therefore, the all-polymer EC/PS electret nanofiber membranes have broad application prospects in the field of air purification .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
E-POLYMERS
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2022
·Vol. 22
·期 1
·763-774
·
IF 3.074
Huizhi Liu,Qilin Mei,Guomin Ding,Han Xiao,Shuhui Chen,Zhixiong Huang
The percolation thresholds of poly ether ether ketone/graphene (PEEK/Gr) composites in most studies are high due to the random distribution of Gr in the matrix. Here, aminated poly-ether-ether-ketone/graphene network (PEEK-NH 2 /GN) nanocomposites were prepared by electrostatic adsorption of PEEK-NH 2 with positive charges and graphene oxide with negative charges, followed by in -situ reduction and hot-pressing. The GN structure of composites was well presented in the images of scanning electron microscope. The PEEK-NH 2 /GN nanocomposites exhibited excellent electrical conductivity with a maximum conductivity of 0.0634 S·cm −1 and a percolation threshold as low as 0.25 vol%. In addition, the maximum tensile strength of nanocomposites was reached at 93 MPa when the Gr content was 0.5 wt%. We believe that this approach is a new avenue for the production of low filler high conductive polymer composites with potential commercial prospects in various fields.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
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IF 3.3
Ruiming Zhang,Luowen Xu,Fengtao Yu,Saijin Xiao,Changfu Wang,Dingzhong Yuan,Yan Liu
The discharge of effluents containing radionuclides has a detrimental impact on the ecological environment, emphasizing the importance of recovering U(VI) from nuclear wastewater to safeguard the environment. Electrosorption has emerged as a viable technique for the extraction of uranium from radioactive solutions. Herein, we propose a facile strategy utilizing ultrasonication to fabricate a novel sulfonated carbon material (HCCMs-SO 3 H) co-doped with B, N, and P atoms. The incorporation of sulfonate groups and doping heteratoms in HCCMs-SO 3 H significantly enhanced its electrosorption capacity for uranium, yielding an impressive capacity of 626.37 mg/g at 0.9 V. This enhancement in electrosorption ability is attributed to the synergistic effects of sulfonate groups and the presence of B, N, and P atoms in the carbon matrix. Furthermore, HCCMs-SO 3 H exhibited excellent recoverability and selectivity towards uranium, endowing it a promising material for uranium extraction from uranium-containing solutions. Its high electrosorption capacity, coupled with favorable recoverability and selectivity, positioned HCCMs-SO 3 H as a potential candidate for efficient and environmentally friendly uranium recovery processes.
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
危险品化学品经营许可证（带存储）