INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Pei Qiu,Mengjie Lu,Gang Cheng,Wei Li,Lijun Liu,Jinyan Xiong
Semiconductor photocatalysis serves a green technique to convert solar energy to sustainable hydrogen energy through water splitting. TiO 2 has attracting increasing interest and much effort has been paid on addressing the suffered drawbacks of solar energy utilization limitation and electron-hole recombination. In this work, simultaneously involving of oxygen vacancy and Cu into TiO 2 nanoparticles has been achieved through self-reduction of Cu 2 O and self-transformation of Ti-precursor from Cu 2 O@Ti-precursor in ethylene glycol-water medium. The Cu@TiO 2-x hybrids show improved photocatalytic H 2 production, and the Cu@TiO 2-x -1% sample has H 2 evolution rate of 7218.8 μmol g −1 h −1 , which is 2.1 times higher than that of TiO 2-x . It is proposed that the involving of metallic copper and oxygen vacancy by this solvothermal approach can enhance light absorption, promote electron-hole pairs separation and charge transfer, and increase active sites of TiO 2 nanoparticles, resulting in synergetic effect for hydrogen production improvement.
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Polymers
·
2022
·Vol. 14
·期 22
·4888
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IF 4.967
Jia Qu,Hongpu Huang,Qiang Yang,Wei Gong,Meilan Li,Liangliang Chang,Baoyue Cao,Guochun Zhang,Chunsheng Zhou
Water pollution is a worldwide problem that requires urgent attention and prevention and exceeding use of heavy-metal ions is one of the most harmful factors, which poses a serious threat to human health and the ecological environment. In this work, a magnetic oxidized micro/mesoporous carbon (MOMMC) was prepared for the easy separation of Cu(II) and Pb(II) from water. The dual-template method was used to prepare micro/mesoporous carbon using sucrose as the carbon source, silica nanoparticles formed by tetraethyl orthosilicate as the microporous templates, and triblock copolymer F127 as the mesoporous template. MOMMC was obtained by oxidation using potassium persulfate and then magnetized through in situ synthesis of Fe3O4nanoparticles. FTIR, TG-DSC, XRD, TEM, SEM, nitrogen adsorption–desorption isotherms, zeta potential, and VSM were used to confirm the synthetic process, structure, and basic properties of MOMMC. The high-saturation magnetization (59.6 emu·g−1) of MOMMC indicated its easy and fast separation from water by an external magnetic field. Kinetics studies showed that the adsorption of Cu(II) and Pb(II) on MOMMC fit the pseudo-second-order model well. Isotherm studies showed that the adsorption behavior of Cu(II) was better described by the Langmuir model, and the adsorption behavior of Pb(II) was better described by both Langmuir and Redlich–Peterson models. MOMMC obtained efficient adsorption for Cu(II) and Pb(II) with the large adsorption capacity of 877.19 and 943.40 mg·g−1according to the Langmuir adsorption isotherm equation, and a better selectivity for Pb(II) was observed in competitive adsorption. MOMMC still possessed a large adsorption capacity for Cu(II) and Pb(II) after three adsorption–desorption cycles. These findings show that MOMMC represents an excellent adsorption material for the efficient removal of heavy-metal ions.Keywords:magnetic mesoporous carbon;adsorption;copper;lead;adsorption kinetics;adsorption isotherms;selectivity
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Materials Today Chemistry
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2022
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IF 7.613
Mingzhen Huang,Siyuan Hu,Dongren Cai,Guowu Zhan
It is a significant method to prepare highly dispersed polymetallic oxides using in-situ doping metal organic frameworks as precursors. Herein, a series of straw-like W/Cu/Ce trimetallic oxides were prepared by using phosphotungstic ionic liquid@Ce-based metal organic framework adsorbing with copper acetylacetonate as precursors. The effect of W content on catalytic activity of W/Cu/Ce trimetallic oxides for carbon monoxide (CO) oxidation was well-investigated. Comprehensive characterization methods and density functional theory calculations were adopted to reveal the property changes of Cu/CeO 2 catalyst by the addition of W. The results demonstrated that W, Cu, and Ce are highly dispersed in the prepared W/Cu/Ce trimetallic oxides, and adding proper amount of W can improve the activity of the catalyst. H 2 temperature-program reduction profiles, X-ray photoelectron spectroscopy, in-situ diffuse reflectance infrared Fourier transform spectroscopy , and density functional theory calculations clearly revealed that after the addition of W, the strength of Ce-O bond is weakened, the oxygen vacancy is increased, and the adsorption of CO is enhanced, respectively, which are vital reasons for its high catalytic activity. In addition, the CO oxidation reaction pathway over prepared W/Cu/Ce trimetallic oxides based on the Mars-van Krevelen mechanism was studied, and the results exhibited that CO can wrest the lattice oxygen of W/Cu/Ce trimetallic oxides to form CO 2 , which is also proved to be the rate-determining step in reaction process.
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CHEMICAL PHYSICS LETTERS
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2022
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IF 2.719
Tianjia Cheng,Yahui Zhang,Fengjiao Cui,Gang Jiang,Peizu Liu,Jing Guo,Kai Cui,Chen Chen,Huidong Li
A novel adsorbent (ZIF-8 cattail cellulose aerogel, ZCCA) with excellent adsorption performance was prepared using cellulose as a dispersant of ZIF-8 and applied to Cu(II) removal from wastewater. ZCCA showed an irregular network structure, which was uniformly filled with ZIF-8 particles. Its adsorption mechanism was the electrostatic attraction and chemical coordination of Cu(II). This adsorption process followed the Pseudo-second-order kinetics and the Langmuir isotherm model. The maximum adsorption capacity was 270.2 mg⋅g −1 at 303 K. In addition, the removal efficiency remained 83 % after 5 adsorption–desorption cycles. ZCCA showed outstanding adsorption performance and high potential in practical application.
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Small
·
2023
·Vol. 19
·期 18
·2207240
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IF 13.3
Yuanmeng Zhao,Yunhao Jiang,Yan Mo,Yueming Zhai,Juejing Liu,Andrew C. Strzelecki,Xiaofeng Guo,Changsheng Shan
It is critical to develop high-performance electrocatalyst for electrochemical nonenzymatic glucose sensing. In this work, a single-atom Pt supported on Cu@CuO core–shell nanowires (Pt 1 /Cu@CuO NWs) for electrochemical nonenzymatic glucose sensor is designed. Pt 1 /Cu@CuO NWs exhibit excellent electrocatalytic oxidation toward glucose with 70 mV lower onset potential (0.131 V) and 2.4 times higher response current than Cu NWs. Sensors fabricated using Pt 1 /Cu@CuO NWs also show high sensitivity (852.163 µA mM −1 cm −2 ), low detection limit (3.6 µM), wide linear range (0.01–5.18 µM), excellent selectivity, and great long-term stability. The outstanding sensing performance of Pt 1 /Cu@CuO NWs, investigated by experiments and density functional theory (DFT) calculations, is attributed to the synergistic effect between Pt single atoms and Cu@CuO core–shell nanowires that generates strong binding energy of glucose on the nanowires. The work provides a new pathway for exploring highly active SACs for electrochemical nonenzymatic glucose sensor.
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ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Yuxin Zhu,Yue Zhao,Xun Sun,Fuhao An,Lanya Jiao,Xuan Sun
Antibacterial strategies based on reactive oxygen species (ROS) have opened up a new avenue for overcoming the great challenges of antibiotics topic including lack of broad-spectrum antibiotics and the emergence of super-resistant bacteria. Herein, we leveraged a strategy of constructing synergistic catalytic active sites to develop a simple yet efficient Fenton-like active nanocomposite, and investigated its catalysis mechanism and antibacterial performance thoroughly. This strategy provides a new direction for boosting the catalytic activity of nanocomposite catalysts for wide application. Specifically, by uniformly loading copper oxide and ceria onto the surface of silica nanocapsules (SiO 2 NCs), we fabricated a bimetallic oxide nanocomposite Cu 0.75 Ce 0.62 O 2 @SiO 2 NC, which performed superior Fenton-like capability in a wide pH range without additional exogenetic hydrogen peroxide (H 2 O 2 ). Such excellent catalytic activity was originated from the charge interaction between the two metal oxide components, where formation of Cu + and oxygen vacancies (OVs) was mutually reinforcing, resulting in a synergistic effect to produce H 2 O 2 and catalyze the generation of •OH under the slight acid condition (pH = 6.0). In view of the outstanding Fenton-like activity, the Cu 0.75 Ce 0.62 O 2 @SiO 2 NC was employed in antimicrobial testing, which demonstrated exceptional high in vitro antimicrobial efficacy against both the S. aureus and E. coli in a neutral environment (pH = 7.4). The excellent performance of the bimetallic nanocomposite Cu 0.75 Ce 0.62 O 2 @SiO 2 NC, including its facile and mild preparation, high water-solubility and stability, superior catalytic and antimicrobial performances, manifests a promising broad-spectrum antibiotic that can be anticipated to deal with the contamination of the environment by bacteria.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Wanling Xu,Chunjie Yu,Jinzhu Chen,Zhiyong Liu
Electrochemical hydrogenation (ECH) is a particularly important and environmentally friendly approach to obtain biomass-based fuels and high value-added fine chemicals without using external hydrogen. Herein, we reported a highly efficient and selective ECH of furfural (FF) into furfuryl alcohol (FA) with Cu-based electrocatalyst in aqueous alkaline media. Under the optimal conditions, FA selectivity close to 100% with 99% FF conversion and total Faradaic efficiency above 95% were obtained with the electrocatalyst. Mechanism investigation suggests an ECH mechanism for FA formation, which is highly potential-dependent to FA selectivity, requiring low and well-matched concentrations between active hydrogen (H ads ) species and FA radical on the Cu surface. Moreover, the electrocatalyst shows an excellent stability and recyclability during the eight-time consecutive recycling experiments, yielding a total amount of 1011 mg FA. This work thus highlights an important guidance for electrocatalytic upgrading of biomass-based platform molecules in an environmentally friendly way.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Lijun Wu,Weifeng Yue,Nengzhan Zheng,Mengshen Guo,Yanguo Teng
Exploring the relationships between heavy metal release and salinity can help address the problems of combination of toxic heavy metals and salinization in contaminated soils. Therefore, in this study, the release characteristics of heavy metals (Cd, Cu and Zn) under different salt types and mass concentrations were investigated through batch desorption experiments. Spearman's correlation analysis was performed to assess the effects of typical physicochemical properties on metal release under salt stress. The results indicated that the types and concentration gradients of salt had notably different impacts on the release of different metals; specifically, there were significant impacts for Cd but slight impacts for Cu and Zn. MgCl 2 and CaCl 2 had more obvious promoting effects on Cd release, followed by a salt mixture and NaCl, and this pattern was similar for Zn release. Most salts could slightly restrain the release of Cu, except for MgCl 2 and Na 2 SO 4 , which had slight promoting effects. Moreover, low levels of CaCl 2 could effectively restrain the release of Cu. The results showed that the release capacities of metals followed the order of Cd > Cu > Zn, possibly attributed to the competitive adsorption among cations. Ferromanganese oxides in the soil favored the release of Cd and Zn under salt treatments, and redox potential was an important factor affecting Cu release. The results also suggested that the background values of metals could affect metal release, but the effects were varied under different salt treatments for Zn. The reason for this may be that the addition of different salts changed the effects of certain soil properties on the metal release. Overall, this study can serve as an important reference for controlling heavy metal pollution in soils in salinization and coastal areas.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Linjing Liu,Bin Yang,Shuai Yang,Qiangwei Kou,Hang Xie,Yuan Sun,Yunfei Chang,Shan-Tao Zhang,Fei Li
Grain-oriented Pb(Mg 1/3 Nb 2/3 )O 3 -PbZrO 3 -PbTiO 3 (PMN-PZ-PT) based ceramics were synthesized through templated grain growth via using BaTiO 3 (BT) templates. Although BT templates are partially destroyed by PMN-PZ-PT matrix, CuO addition remarkably promotes [001] c -oriented grain growth behavior of the ceramics, resulting in an improvement of Lotgering factor F 001 from ~86% to 98%. Both crystallographic texture and CuO doping increase tetragonality and reduce average domain size of the ceramics dominated by rhombohedral phase. Consequently, 0.50 wt% CuO-doped ceramics ( F 001 ~98%) exhibit optimum electromechanical properties: d 33 ~860 pC/N, d 33 × g 33 ~48.6 × 10 −12 m 2 /N, k p ~0.80, E c ~7.2 kV/cm, tan δ ~0.8% and T c ~222 °C. In addition to ~3.7 times and 6.6 times higher d 33 and d 33 × g 33 , those ceramics possess about 240% enhanced piezoelectric strain and much better thermal stability ( S max / E max variation ≤2% between RT and 150 °C) relative to non-textured counterpart. This work offers a good paradigm for simultaneously exploring high piezoelectric response and good temperature stability in piezoceramics, benefiting the development of next-generation advanced electromechanical devices.
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MOLECULES
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2022
·Vol. 27
·期 19
·6385
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IF 4.927
Chengzhi Yu,Libin Zheng,Yongyuan Hong,Jiabin Chen,Feng Gao,Yalei Zhang,Xuefei Zhou,Libin Yang
Advanced oxidation processes (AOPs) demonstrate great micropollutant degradation efficiency. In this study, CuFe2O4was successfully used to activate peracetic acid (PAA) to remove Rhodamine B. Acetyl(per)oxyl radicals were the dominant species in this novel system. The addition of 2,4-hexadiene (2,4-HD) and Methanol (MeOH) significantly inhibited the degradation efficiency of Rhodamine B. The ≡Cu2+/≡Cu+redox cycle dominated PAA activation, thereby producing organic radicals (R-O˙) including CH3C(O)O˙ and CH3C(O)OO˙, which accounted for the degradation of Rhodamine B. Increasing either the concentration of CuFe2O4(0–100 mg/L) or PAA (10–100 mg/L) promoted the removal efficiency of this potent system. In addition, weakly acid to weakly alkali pH conditions (6–8) were suitable for pollutant removal. The addition of Humid acid (HA), HCO3−, and a small amount of Cl−(10–100 mmol·L−1) slightly inhibited the degradation of Rhodamine B. However, degradation was accelerated by the inclusion of high concentrations (200 mmol·L−1) of Cl−. After four iterations of catalyst recycling, the degradation efficiency remained stable and no additional functional group characteristic peaks were observed. Taking into consideration the reaction conditions, interfering substances, system stability, and pollutant-removal efficiency, the CuFe2O4/PAA system demonstrated great potential for the degradation of Rhodamine B.Keywords:peracetic acid (PAA);rhodamine B;copper ferrite (CuFe2O4);organic radicals (R-O˙)
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
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IF 5.141
Bingbing Cui,Chuanpan Guo,Guodong Fu,Zhihong Zhang
A novel photochromic and self-bleaching hydrogel was prepared based on the Cu-doped tungsten oxide (WO 3 ) hybrid encapsulated in the co-polymer matrix polymerized using acrylamide (AM) and hydroxyethyl acrylate (HEA) as monomers. The Cu-WO 3 -25 % hybrid was generated by introducing Cu species into the lattice of WO 3 with hexagonal-like prismatic structure and acted as light absorber. Given that WO 3 and Cu-doped WO 3 hybrids possess superior water solubility by using water and deep eutectic solvents (DESs, ChCl:EG) containing sufficient hydrogen bond as co-solvent, the high transparency of 90 % of the hydrogels was achieved. As compared with P(AM-HEA)-WO 3 -based hydrogel, the P(AM-HEA)-Cu-WO 3 -X hydrogel exhibited the enhanced coloration degree under UV irradiation. The P(AM-HEA)-Cu-WO 3 -25 % photochromic hydrogel changed from colorless to blue immediately once illuminated by UV light, and turns into dark-blue with the irradiation time going on. The self-bleaching process indicates it only takes 40 min for the P(AM-HEA)-Cu-WO 3 -25 % hydrogel to return to the original colorless transparent state. Furthermore, the hydrogel systems exhibit efficient antibacterial activities against bacteria of both E. coli and S. aureus , accompanying with outstanding biocompatibility. As such, the fabricated hydrogel demonstrates rapid photoresponse, self-bleaching process, superior antibacterial performance, and cell viability, showing a great potential application as stimuli-responsive materials.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Junhua Li,Linsen Huang,Zhimei Yang,Zengjian Liu,Xiaosong Sun
Sunlight driven photocatalytic degradation is an effective and eco-friendly technology for water remediation . And formation of metal-semiconductor heterojunction provides a promising strategy to enhance the photocatalytic efficiency of photocatalyst. In this work, the hierarchical Cu 2 O/Cu hollow sphere was newly prepared by a simple template-free and one-pot solvothermal method without using any organic capping agents. The composition, morphology structure and photoelectric properties of the prepared photocatalysts were investigated by the characterization of XRD, XPS, SEM, TEM , nitrogen adsorption/desorption isotherms, UV-DRS and EIS, etc. It was found that the Cu 2 O/Cu composite with hierarchical hollow sphere structure exhibits good stability and excellent photocatalytic activity for the degradation of methyl orange (MO) and tetracycline (TC) under visible light, because the huge specific surface area provides more active sites and the Cu 2 O/Cu heterojunction could efficiently facilitate photogenerated carries separation. Further, free radical scavenging experiments and EPR tests confirmed the ·O 2 - radicals were produced and played the most important role in the photocatalytic process. Finally, the possible photocatalytic mechanism and the transfer processes of photogenerated carriers of hierarchical Cu 2 O/Cu hollow sphere was proposed. As a result, the hierarchical Cu 2 O/Cu hollow sphere may be a suitable candidate of high-efficiency photocatalyst for the wastewater treatment .
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