SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yashi Qing,Yanxiang Li,Lixia Cao,Yujie Yang,Li Han,Panchan Dansawad,Haigang Gao,Wangliang Li
17β-estradiol (E2) in natural water has caused serious environmental problems because of its extremely high estrogenic activity. Herein, a novel β-CD@PANI/BiOBr (C-PANI/BiOBr) step scheme (S-scheme) heterojunction photocatalyst was successfully prepared via facile chemical precipitation method. The encapsulation of β-cyclodextrin (β-CD) around polyaniline (PANI) contributed to better transfer of photogenerated carries by the stabilization of radical cation and excellent adsorption capability driven by hydrophobic interaction, hydrogen bonding and π-π stacking. The C-PANI/BiOBr heterojunction photocatalysts realized excellent light absorption in full spectrum. The N derived from C-PANI could coordinate with Bi metal ions, which favored forming BiOBr with (1 1 0) facet exposure, thus promoting the photogenerated electron-hole separation. The optimal 20% C-PANI/BiOBr achieved rapid degradation of contaminants (100% removal of E2 in 40 min and RhB in 9 min) under visible light irradiation. Furthermore, three main degradation pathways of E2 photodegradation were proposed by high performance liquid chromatography-mass spectrometer (HPLC-MS) results, and the toxicity of E2 and intermediates were evaluated by ECOSAR program. The active species capture experiment indicated that h + and •O 2 – played the dominated roles in the photodegradation process and S-scheme mechanism of C-PANI/BiOBr with enhanced photocatalytic performance was also revealed. This study provided an insight in fabricating efficient photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yashi Qing,Enming Huang,Lixia Cao,Haigang Gao,Shengyong Zhao,Yanxiang Li,Wangliang Li
The prevalence of 17β-estradiol (E2) in wastewater has attracted widespread attention due to the negative impacts on ecological environments and human health. Nowadays, photocatalysis has been emerged as an efficient technology for E2 containing wastewater treatment. However, traditional powder photocatalysts face challenges such as easy agglomeration, secondary pollution and difficult recovery, limiting their large-scale application. In this study, a photocatalytic PA/C-PANI@BiOBr membrane was fabricated by immobilizing polyaniline (PANI) layer and BiOBr nanosheets on polyamide (PA) membrane through in-situ chemical bath deposition. This process leveraged the strong hydrogen bond interaction between PANI and PA, with the fine PANI fibers providing nucleation sites for the in-situ growth of BiOBr nanosheets. By repeating the immersion process, we controlled variations in the coverage density and morphology of BiOBr on the membrane surface. The PA/C-PANI@BiOBr membrane exhibited outstanding light absorption and photocatalytic performance. Notably, the optimal PA/C-PANI@BiOBr-10 membrane achieved 100 % removal efficiency of 3 mg L −1 E2 within 40 min. In dynamic cyclic experiments, PA/C-PANI@BiOBr-10 membrane maintained stable permeability and high removal efficiency of pollutants. The photocatalytic mechanism underlying these results was elucidated through photoelectric testing and further photocatalytic experiments. Furthermore, the PA/C-PANI/BiOBr-10 membrane demonstrated remarkable durability over multiple consecutive cycles, with E2 removal efficiency remaining above 96.5 % after 5 cycles.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Boyang Zhou,Zhifang Li,Deyu Qin,Qian Zhang,Miao Yu,Changlong Yang
Polyaniline (PANI) has been widely studied because of its unique physicochemical properties, but its practical significance in supercapacitors is seriously affected by its structural collapse during charging and discharging. We have successfully synthesized transition metal oxide/carbon-polyaniline composite electrode materials by in situ growth of polyaniline using the electrodeposition method with a metal-organic skeleton as a sacrificial template. This method not only can obtain high capacitance materials but also carbon materials provide buffer space during long-term charge/discharge to improve the overall stability. ZnCoO x /C-PANI-3 has a smaller charge transfer resistance and solution resistance compared to other materials, indicating that the interfacial coupling between PANI and ZnCoO x /C shortens the ion transport path between electrolyte and electrode surface, which is beneficial for rapid ion transfer and thus enhances its electrochemical performance. ZnCoO x /C-PANI-3 as an electrode material in the three-electrode system, has remarkable specific capacitance (1055 F . g −1 at a current density of 1 A . g −1 ) and good cycling stability (85.7% capacitance retention after 10,000 cycles of charge and discharge at high current density). Similarly, the asymmetric supercapacitor (ZnCoO x /C-PANI-3//AC) assembled with ZnCoO x /C-PANI-3 as the positive electrode material and activated carbon as the negative electrode material has a maximum energy density of 42.77 Wh . kg −1 at a power density of 705 W . kg −1 and a remarkable cycle life with a capacitance retention rate of 80% after 5000 cycles. This research opens up new avenues for studying polyaniline/MOF derivatives (transition metal oxide-carbon) composites.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 6
·1034
·
IF 4.324
Qing Liu,Shihang Zhang,Yan Xu
In this study, the dense cloud-like structured CuS nanoparticles were successfully prepared using a simple two-step hydrothermal method. The experimental temperature was the most important factor that affected the microstructure and surface functions of CuS/C. Therefore, the CuS/C electrodes were synthesized at different temperatures (80 °C, 120 °C, and 160 °C). Subsequently, their crystallographic phase and morphologies as well as the structure of the as-prepared electrodes were analyzed in detail. The electrode prepared at 120 °C (CuS/C-120) was determined to have a perfect microstructure, high specific capacitance, and good rate performance. To further improve the electrochemical performance of this electrode, it was combined with polyaniline (PANI) to obtain a CuS/C-120@PANI electrode via the cyclic voltammetric electrodeposition method. The CuS/C-120@PANI electrode exhibits a specific capacitance of 425.53 Fg−1at a current density of 1 Ag−1and a good cycling stability of 89.86% after 3000 cycles. The perfect architecture of CuS/C-120@PANI maximizes the synergistic effect between its different components and provides abundant electrochemically reactive sites, promoting the diffusion and transfer of electrolyte ions during the electrochemical reaction processes. Detailed analysis shows that the CuS/C-120@PANI electrode has great potential for use in high-performance energy storage devices.Keywords:CuS/C-120@PANI;nanocomposites;supercapacitor;electrode material
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer-Plastics Technology and Materials
·
2021
·
IF 2.371
Dina F. Katowah,Gharam I. Mohammed,Waheed A. Adeosun,Abullah M. Asiri,Mahmoud A. Hussein
This paper reports an electrochemical sensor developed based on cross-linked polyaniline/(chitosan-oxidized single-walled carbon nanotube-graphene oxide/copper oxide) nanocomposite (C-PANI/(OXSWCNTs-GO-CS)/CuO NCs) for detection of a 4-chlorophenol (4-CP). The NCs synthesized by an in-situ chemical polymerization method and characterized by various techniques include XRD, FTIR, SEM-EDX, HR-TEM, TGA-DTG, DTA and cyclic voltammetry. A 4-CP selective electrochemical sensor was fabricated by coating a glassy carbon electrode (GCE) with synthesized NCs. The experimental results reported here displayed the good electrochemical property toward 4-CP oxidation with a detection limit of 0.13 µM (S/N = 3) and good current stability. It also had an impressive percent recovery of the spiked 4-CP in real environmental samples. The improved sensing performances were attributed to the formation of the network structure of C-PANI/(OXSWCNTs-GO-CS)/CuO NCs. Therefore, this study presents a sensitive and promising 4-CP electrochemical sensor for water quality management and human health protection.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Xiaohui Niu,Simeng Yan,Letong Wang,Jinliang Chen,Rui Zhao,Hongxia Li,Jian Liu,Kunjie Wang
So far, the fabrication of chiral metal-organic framework (CMOF) is difficult to predict and the chiral functionality mainly comes from the building blocks that is a part of the frameworks. The induction effect in the chiral nanochannels of the metal-organic framework (MOF) makes achiral polymers have chiral properties, which has not been well explored. Therefore, CMOFs with chiral nanochannels or chiral pores appear to have special functions. Herein, CMOFs (D-his-ZIF-8) with chiral micropores or chiral nanochannels are prepared through a simple 2-methyl imidazolate in-situ substitution by d -histidine. The unmodified polyaniline with chirality ( c -PANI) was synthesized in chiral nanochannels and pores of CMOF, which brought about chiral induction from the chiral nanochannels and pores of CMOF to c -PANI chains. The circular dichroism shows that the c -PANI chains released from the chiral nanochannel still maintains the chiral properties even leaves the chiral nanochannel. It can be seen from the electrochemical results that c -PANI has excellent conductivity, and the conductivity of CMOF is very poor. Electrochemical recognition showed that both CMOF and c -PANI have certain chiral recognition effects for L-Trp and D-Trp, from which the optimal recognition effect was obtained from c -PANI chains. This shows that the excellent conductivity of c -PANI not only expands the electrochemical signal, but also the helical structure of the c -PANI chains accelerates the distinction of chiral molecules. This study provides a novel perspective to induce chiral polymer chains with better conductivity in the nanochannels of CMOF.
研究领域:
材料科学
·
化学
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）