POLYMER BULLETIN
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2015
·Vol. 72
·期 10
·2455-2469
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IF 1.438
Bai Liangjiu,Wang Dongju,Chen Hou,Li Dongxin,Xu Yuanyuan,Yu Lili,Wang Wenxiang
Abstract Peanut shell (PNS) was used to prepare a novel adsorbent to achieve resource recovery of the agricultural residue. The hydroxyl groups of peanut shell were turned into –C(CH 3 ) 2 –Br pendant groups to initiate polymerization of acrylonitrile. Graft copolymer peanut shell/polyacrylonitrile (PNS- g -PAN) was modified by hydroxylamine hydrochloride to transform the cyano groups into amidoxime (AO) groups. The modified copolymer of AO-PNS- g -PAN was used as adsorbent. The maximum adsorption capacity for Hg(II) was 4.45 mmol g −1 . The adsorption process fitted well the Freundlich isotherm model and followed pseudo-second-order model. The modified copolymer demonstrated its potential as an efficient adsorbent to solve the problem of Hg(II) contamination. Graphical abstract The peanut shell (PNS) macroinitiator was obtained by acylation of hydroxyl groups on the cellulose backbone of the peanut shell and initiated by Cu(0)-mediated RDRP of acrylonitrile. PNS- g -PAN was modified by NH 2 OH·HCl and used to remove heavy metal ions. The maximum adsorption capacity of Hg(II) was 4.45 mmol g −1 .
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fan Wang,Lijuan Zhang,Yeying Wang,Xijian Liu,Sohrab Rohani,Jie Lu
The graphene oxide (GO) functionalized by Fe 3 O 4 @SiO 2 @CS-TETA nanoparticles, Fe 3 O 4 @SiO 2 @CS-TETA-GO, was firstly fabricated in a mild way as a novel adsorbent for the removal of Cu(II) ions and methylene blue (MB) from aqueous solutions. The magnetic composites showed a good dispersity in water and can be conveniently collected for reuse through magnetic separation due to its excellent magnetism. When the Fe 3 O 4 @SiO 2 @CS- TETA-GO was used as an absorbent for the absorption of MB and Cu(II), the adsorption kinetics and isotherms data well fitted the pseudo-second-order model and the Langmuir model, respectively. Under the optimized pH and initial concentration, the maximum adsorption capacity was about 529.1 mg g −1 for MB in 20 min and 324.7 mg g −1 for Cu(II) in 16 min, respectively, exhibiting a better adsorption performance than other GO-based adsorbents reported recently. More importantly, the synthesized adsorbent could be effectively regenerated and repeatedly utilized without significant capacity loss after six times cycles. All the results demonstrated that Fe 3 O 4 @SiO 2 @CS-TETA-GO could be used as an excellent adsorbent for the adsorption of Cu(II) and MB in many fields.
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 1
·755-763
·
IF 3.086
Zhihong Zhang,Hongfei Ji,Shuai Zhang,Donglai Peng,Qixuan Fu,Minghua Wang,Linghao He,Lingyu Yue
We report a novel nanocomposite of hollow TiO2 microspheres and plasma polyacrylic acid (TiO2@PPAA) modified with rhodamine B (TiO2@PPAA-RhB). This nanocomposite was further used as an electrochemical sensor for the ultra-sensitive and selective detection of Cu2+ in water. A gold electrode was modified with hollow TiO2 nanospheres, followed by the closely bonded layer of PPAA via plasma polymerization. Subsequently, the carboxyl groups of TiO2@PPAA nanocomposites were activated to ester groups by N-hydroxysuccinimide/1-ethyl-3-(3-dimethylaminoprolyl) carbodiimide hydrochloride. The resultant activated ester groups reacted with the amino groups on rhodamine to form the amide groups, leading to the modification of TiO2@PPAA nanocomposites with rhodamine. Considering the synergistic effect of strong electrostatic interaction between the carboxyl groups of PPAA and Cu2+, the direct adsorption of Cu2+ on the TiO2 surface, and the coordination chemistry formed between Cu2+ and rhodamine, the developed electrochemical biosensor exhibited high sensitivity of Cu2+ detection, with a detection limit of 0.404 pM within the range of 0.001–10 nM of Cu2+. Therefore, the fabricated electrochemical sensor based on TiO2@PPAA-RhB can be obtained via plasma polymerization and represents a highly promising tool for use in environmental monitoring.
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Journal of CO2 Utilization
·
2017
·
IF 4.292
Chen Zhang,Haiyan Yang,Peng Gao,He Zhu,Liangshu Zhong,Hui Wang,Wei Wei,Yuhan Sun
A series of Cu/ZnO/Al 2 O 3 catalysts with the total weight percentage of Cu and ZnO from 9.94 wt.% to 44.5 wt.% have been prepared by ammonia deposition −precipitation method and tested for methanol synthesis from CO 2 hydrogenation. A Cu/Zn/Al layered double hydroxides (LDHs) precursor can be formed in situ on the surface of microspherical Al 2 O 3 which acts as both support and sole source of Al 3+ cations. With increase of total Cu and ZnO loading, the dispersion of copper and reducibility of CuO decline continuously, while the exposed copper surface area increases gradually. In addition, the formation of LDHs results in a stronger both basicity and acid strength on the catalyst surface. It is found that the CO 2 conversion increases linearly with increase of the Cu and ZnO loading. The methanol selectivity for the catalyst with low total metal loading (9.94 wt.%) is much lower than those for other catalysts, though it increases with increasing loading, which can be mainly assigned to the much smaller Cu particle size (<5 nm) and the higher ratio of isolated CuO phase. Moreover, the Cu/ZnO/Al 2 O 3 catalyst with relatively high total metal loading (44.50 wt.%) still exhibits a considerable stable catalytic performance due to the formation of LDH structure.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hu Li,Yingying Peng,Weixiang Zhou,Jun Guo,Chao Gao,Yapeng He,Mingxi Pan,Congqing Yang,Hui Huang
In the development of back electrodes for perovskite solar cells (PSCs), the major challenges are stability and cost. To address this, we present an innovative approach: Simultaneous evaporation of two independently controlled sources of metal materials was performed to achieve a uniform distribution of the alloy electrodes. In this study, Ag–Cu alloys (the molar ratio of Ag/Cu is 7/3) with a high-index crystal face (111) and a work function matching perovskite were prepared using a codeposition technique. These properties mitigate nonradiative carrier recombination at the interface and reduce the energy barrier for carrier migration. Consequently, compared to Ag based PSCs (22.77%), the implementation of Ag–Cu alloy (Ag/Cu is 7/3)-based PSCs resulted in a power conversion efficiency of 23.72%. In a 1500 h tracking test in ambient air, the Ag–Cu alloy (Ag/Cu is 7/3)-based PSCs maintained their initial efficiency of 86%. This can be attributed to almost no migration of elements from the Ag–Cu alloy electrode to the perovskite layer. Our work presents a vital strategy for improving the stability of PSCs and reducing the costs associated with the back electrode in PSCs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Rong Yang,Jianan Liu,Xuemeng Sun,Cheng Wang,Baojiang Jiang
The application of photocatalysis for the production of high-purity and high-energy-density green ammonia holds substantial promise. However, the restricted light absorption efficiency and high recombination rate of electron-hole pairs present significant obstacles to its practical deployment. In this study, we enhanced the photocatalytic efficiency of N 2 fixation by engineering a Mott-Schottky heterojunction and incorporating hollow microreactors. We synthesized Hollow-ZnO (H-ZnO) using ZIF-8 as a precursor and subsequently deposited Cu nanoparticles onto the H-ZnO to create the H-ZnO/Cu photocatalyst. The hollow structure not only bolstered the catalyst’s light scattering and absorption capabilities but also reduced the path length for photogenerated electron transitions, thereby improving the efficiency of electron transport and effectively inhibiting electron-hole pair recombination. Under Xe lamp irradiation, the H-ZnO/Cu-3 photocatalyst achieved a superior NH 4 + yield of 68.1 μmol g −1 h −1 without the addition of any sacrificial reagents, representing a 7.5-fold enhancement over pure ZnO. This research offers a novel strategy for designing metal oxide photocatalysts derived from MOFs and developing cost-effective photocatalytic systems.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Nan Xin,Yifei Li,Guihua Tang,Tian Lan,Jimin Xu,Xin Zhao,Min Zhang,Yinan Nie,Hao Shen
Thermoelectric materials have great potential in the energy recovery and environmental protection, and thermoelectric films can also effectively achieve heat dissipation of the chip through thermoelectric refrigeration. WS 2 films show good thermoelectric performance in prediction, but the figure of merit ( ZT ) of the synthesized WS 2 films still needs improvement. In this work, Cu was doped into WS 2 films by magnetron sputtering combined with chemical vapor deposition and sulfurization annealing. Cu doping narrowed the band gap and increased the hole concentration from 5.6 × 10 19 cm −3 to 2.2 × 10 21 cm −3 , greatly improved the electrical properties of WS 2 film. At 300 K, the electrical conductivity and power factor of Cu-doped films increased by 1086 % and 575 % compared to pristine WS 2 , respectively. In addition, Cu doping reduced the grain size and introduced more grain boundaries, which decreased the in-plane thermal conductivity to as low as 0.22 W m −1 K −1 at 300 K. The coupling of the electrical and thermal properties optimization greatly improved ZT . The ZT value of Cu 5.5 -WS 2 films is as high as 0.181 at 425 K. This work provides a new idea for improving the thermoelectric performance of transition metal dichalcogenides (TMDCs) films.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yan Shi,Yang Zhang,Chengping Miao,Jianxing Yu,Xiaohua Tu,Jiayou Li
Plasma electrolytic oxidation (PEO) coatings with long-lasting active protection were prepared by incorporating 2-mercaptobenzothiazole (MBT)-loaded halloysite nanotubes (HNTs), followed by introduced insoluble Cu-MBT complex, has been achieved in present study. To further compare and analyze the corrosion characteristics of the sample, different halloysite nanotubes (HNTs, MBT@HNTs) profiles were also added to the electrolytes for the preparation of different oxide films (HNTs-PEO and MBT-HNTs-PEO). The coatings were characterized by scanning electron microscopy (SEM), film thickness meter, roughness meter, energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The corrosion behavior was evaluated by electrochemical impedance spectroscopy (EIS), and open circuit potential (OCP) tests. The results show that the long-term corrosion resistance of magnesium alloys can be improved by adding Cu - MBT-HNTs owning to the self-healing effect.
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Catalysts
·
2025
·Vol. 15
·期 3
·199
·
IF 4
Aiming Huang,Jiayue Yu,Junjun Zhang,Yifan Zhang,Yang Wu,Yong Wang,Wen Luo
The electroreduction of CO2(CO2RR) is a promising and environmentally sustainable approach to closing the carbon cycle. However, achieving high activity and selectivity for multicarbon (C2₊) products remains a significant challenge due to the complexity of reaction pathways. In this study, porous carbon-supported copper catalysts (CuHCS) with pore sizes of 120 nm (CuHCS120) and 500 nm (CuHCS500) were synthesized to tailor the microenvironment at the electrode–electrolyte interface and enhance product selectivity. CuHCS120 achieved a maximum faradaic efficiency (FE) for C2₊ products of 46%, double that of CuHCS500 (23%). In contrast, CuHCS500 showed a higher FE for CO (36%) compared to CuHCS120 (14%) at the same potential. In-depth ex situ and in situ investigations revealed that smaller pores promote the enrichment and adsorption of *CO intermediates, thereby enhancing C–C coupling and the formation of C2₊ products. These findings underscore the critical role of structural confinement in modulating the catalytic microenvironment and provide valuable insights for the rational design of advanced catalysts for CO2RR.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Zhijiang Rong,Wei Guo,Haotian Liang,Huan Lv,Hua Guo,Yi Zhang,Bo Zhang,Chunyan Hao,Xianjun Liu,Hongyan Sun,Yifan Gao
Biological metal ions play crucial roles in various life processes and exhibit diverse biological functions. Specifically, Ca(II), Mg(II), Cu(II), and Mn (II) ions are intricately involved in insulin function. To further clarify the biological functions of biological metal ions on insulin, the interaction mechanism of insulin affected by Ca(II), Mg(II), Cu(II), and Mn (II) ions were comparably investigated via spectroscopic, circular dichroism(CD), and electrochemical approaches. Electrochemical studies demonstrate that Mn(II) forms an M 2 L-type complex with insulin, exhibiting a binding constant of β Mn = 9.3 × 10 9 , while Cu(II) and insulin form an M 4 L-type complex with a significantly higher binding constant of β Cu =9.18 × 10 12 . Electrochemical investigation of the interaction between Ca(II) and Mg(II) with insulin adsorbed onto a glass carbon electrode surface revealed that the presence of Ca(II) and Mg(II) induced conformational changes in insulin, resulting in reduced adsorption capacity. Additionally, it was observed that the presence of Ca(II) and Mg(II) enhanced the redox signal of probe ions. The binding constants values were calculated to be 1.108 × 10 3 L•mol –1 for the insulin-Ca(II) system and 2.28 ×10 2 L• mol –1 for the insulin-Mg(II) system. Spectroscopic studies showed that the binding of Cu(II) ions to insulin molecules may be controlled by chelation mechanism, and the interaction between Cu(II) ions and insulin molecules may occur in the aromatic region. Mn(II) ion binding is mainly controlled by ionic interactions, and its binding site is far away from the aromatic region.The combination of Ca(II) and Mg(II) with insulin induced a small enhancement in the Ultraviolet-visible (UV) absorption peak, with Ca(II) exhibiting a more pronounced effect compared to Mg(II). The results of spectral, CD and electrochemical studies are consistent.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jie Song,Lijun Chen,Yingnan Zhou,Zhiwen Yuan,Yuhua Niu,Zhiqiang Wei
With the rapid development of industrialization, the removal of heavy metal ions and small organic molecules from wastewater has triggered a hot debate. ZIF-8 was grown on a sodium alginate backbone using an in situ growth technique, the core-shell P-SMG@ZIF-8 was synthesized. It was also characterized by FTIR, XRD, SEM, UV–Vis and XPS, and the optimal conditions and mechanism of adsorption were explored. At pH 2.0, a contact time of 200 min, and 298 K, removal of Cu(II) and Ph up to 80.2 %, 65.6 % by P-SMG@ZIF-8, adsorption behavior consistent with Langmuir model for pseudo-secondary rates, the saturated adsorption of Cu(II) and Ph could reach up to 83.5812 mg/g and 78.1779 mg/g, respectively. And the adsorbed P-SMG@ZIF-8 is easy to separate and reusable, which is a cost-effective and efficient natural product-based adsorption material.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xueqian Wu,Zhen Li,Jiangyan Tao,Jin Zhao,Yufei Xie,Songjian Zhao
The discharge of colorless and water-soluble formaldehyde (FA) wastewater poses a serious threat to human health. In this study, copper based Fenton-like catalyst Cu x S y was innovatively introduced into the FA degradation system. Cu x S y catalysts with different morphologies were regulated by ethylenediamine . The Cu 7 S 4 catalyst exhibited 99% degradation performance towards FA. The physical and chemical properties of catalysts indicate that the Cu 7 S 4 catalyst has a beautiful dendritic snowflake like structure, which is more conducive to the adsorption and degradation process of FA. Electron paramagnetic resonance (EPR) detected an obvious Cu defect (g=2.064) in Cu 7 S 4 , which can effectively activate H 2 O 2 and stimulate the generation of •OH, thus accelerating the degradation of FA. Compared with Fenton reagent, Cu 7 S 4 shows more than 75% FA degradation performance (pH=5 and pH=9). Further research showed that the H 2 O 2 :Cu 7 S 4 ratio of 2:10 showed a 95% degradation effect on FA at 200–1000 ppm, demonstrating a more efficient and stable FA degradation ability. Moreover, the mechanism of FA degradation was analyzed.
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