SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yahui Liu,Quan Li,Yanhong Ji,Mohammad Younas,Benqiao He
The preparation of conductive loose nanofiltration (NF) membranes for effective separation of dye/salt wastewater mixtures remains a great challenge. In the current study, a novel method of immersing the polyaniline (PANI) membrane in some organic salt solutions to dope PANI membrane was employed to prepare conductive PANI loose NF membranes. Three dopants with different molecular weight, poly (sodium 4-styrene sulfonate) (PSS), sodium dodecyl sulfate (SDS), and sodium dodecylbenzene sulfonate (SDBS), were chosen to prepare the doping solutions under neutral and acidic (pH = 0.5 in HCl) conditions. The neutrally doped PANI membranes all had lower pore size distribution, lower Zeta potential, and higher conductivity compared with the undoped PANI membrane; and these properties were further enhanced for the membranes doped under acidic condition. The PANI membrane doped by acidic PSS solution (PANI-PSS-HCl membrane) had a pore size of 1.7 nm and a pure water flux of 44.7 L·m −2 ·h −1 , and exhibited a rejection of over 99.9 % for eriochrome black T, acid fuchsin, congo red, and sunset yellow in the dye solutions, whereas less than 5 % for NaCl solution, which was suitable for dye/salt separation due to the large molecular size of PSS. When PANI-PSS-HCl membrane was used as the cathode, the membrane exhibited excellent anti-fouling performance with increased external voltage due to enhancement of electrostatic repulsion force between the anionic dyes and the surface of the conductive membrane. This work provides a simple and reliable method to prepare conductive loose NF membranes for effective separation of dye/salt wastewater with excellent anti-fouling performance under external voltage.
研究领域:
材料科学
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环境工程
·
化学工程
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产品关联
DOI
高影响因子
Environmental Science-Advances
·
2024
·Vol. 3
·期 5
·763-775
·
IF 3.5
Youmei Xu,Yuchao Chen,Mengxia Wang,Yufei Shu,Siyu Cao,Zhongying Wang
Nitrophenol wastewater treatment and extracting and reusing precious metals from electronic wastewater have recently gained considerable attention. In this study, polyaniline-based membranes showcased remarkable gold recovery capability from electronic wastewater, effectively reclaiming 100% of gold on the membrane surface even in the presence of competing metal cations. The prepared Au@PmPD membrane, characterized by its high specific surface area and abundant Au nanoparticles (NPs), demonstrated excellent catalytic activity and stability, maintaining near 100% conversion efficiency in reducing 4-NP to 4-AP in the presence of NaBH4 over extended durations. Compared with the conventional physical mixing method, our in situ formation of the Au@PmPD membrane highlights the superior distribution of Au NPs and active sites for enhanced catalytic efficiency. It eliminates the need for additional steps to load Au NPs onto the membrane, resulting in a more straightforward and efficient process. Overall, this research provides a sustainable approach to repurposing waste into precious resources and offers a promising solution for the efficient treatment of persistent organic pollutants in wastewater, aligning with the principles of a circular economy.
研究领域:
环境科学
·
材料科学
·
化学工程
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产品关联
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 1
·223-234
·
IF 2.7
Li Xia,Yue Dongmin,Liu Fei,Yu Jingtong,Li Bingbing,Sun De,Ma Xin
Interface solar desalination technology is an important green and sustainable strategy to solve the freshwater crisis. Herein, polyaniline (PANI) membranes were prepared by immersion precipitation phase inversion (NIPs) method and using for solar-driven water evaporation. To improve the light absorption rate of the PANI membrane, acid doping modification was carried out to the membrane. The results show that the polyaniline-p-toluene sulfonic acid (PANI-PTSA) membrane modified by p-toluene sulfonic acid (PTSA) has microporous structure, and the hydrophilicity was greatly improved after modification. The water evaporation rate and solar energy conversion efficiency of PANI-PTSA membrane were 1.38 kg/(m 2 h) and 80.7% under 1 kW/m 2 sunlight irradiation, respectively, significantly improved compared to the original membrane. Due to the electrostatic repulsion effect of PANI-PTSA on anion charged SO
− 3
, Na + is separated from Cl − , which reduces the salt crystallization in the evaporator, indicating that PANI-PTSA membrane has certain salt resistance in solar desalination experiments. This work provides a simple method to prepare the PANI-PTSA membrane with high efficiency and salt resistance that has huge potential for practical application of interface solar desalination technology.
研究领域:
材料科学
·
环境科学
·
能源科学
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产品关联
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Xiang Chu,Xun Zhao,Yihao Zhou,Yihan Wang,Xueling Han,Yilin Zhou,Jingxin Ma,Zixing Wang,Haichao Huang,Zhong Xu,Cheng Yan,Haitao Zhang,Weiqing Yang,Jun Chen
Developing lightweight, flexible, and foldable electrodes with decent mechanical durability and electrochemical activity is a highly desirable goal for solid-state electrochemical energy storage devices yet remains a formidable challenge to overcome. Herein, we invent a freestanding robust PANI membrane via introducing the dynamic boronate bond to bridge rigid PANI chains with complaint polyvinyl alcohol (PVA) chains. The resultant PANI/PVA membrane (PPM) exhibits remarkable elasticity (17.8% strain) along with excellent tensile strength (33.7 MPa), outperforming the majority of existing state-of-the-art flexible electrochemical PANI membranes. Additionally, the PPM can be further assembled into a wearable solid-state supercapacitor with high electrochemical performance as well as decent mechanical durability. The lightweight, flexible, and foldable PANI membrane represents a great advancement in electrode materials for next-generation wearable solid-state electrochemical energy storage devices.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Guangli Liu,Xiaoxia Shu,Jiaxin Li,Ting Xu,Cong Sui,Shengzhao Zhang,Runhuai Yang
Low ionic content of sweat markers and the weak bioelectrical signals necessitate the design of high-performance signal conditioning circuits to enhance the functionality of the sensors. In this paper, pH sensor based on a polyaniline (PANI) membrane and an NTC thermistor are used to sense sweat pH and temperature, respectively. The linearity, reproducibility, selectivity, and long-term stability PANI pH sensors are evaluated using electrochemical workstation. The sensitivity of pH sensor is 55.32 mV/pH in the range of pH 4–10. The flexible printed circuit board (FPCB) integrates the LT1462 amplifier with low bias input current enhancing the response signal gain of the pH sensor, which achieves a measured slope of 76.41 mV/pH, significantly exceeding the conventional Nernst theoretical value of 59.16 mV/pH at 25°C. The pH sensor integrated with FPCB is applied to detect actual samples, such as food and synthetic sweat, and the results are consistent with commercial pH meter. Finally, the wearable sweat sensing system was integrated with sensors, FPCB, power supply battery and hydrogel patch for the real-time monitoring of temperature and pH, indicating the reliability for practical application. The results of this study are expected to be applied in the fields of health monitoring and sports physiology research.
研究领域:
生物医学工程
·
传感器技术
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可穿戴电子
·
电化学
·
健康监测
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）