Micromachines
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2022
·Vol. 13
·期 8
·1292
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IF 3.523
Yuan Ji,Zhenlong Li,Yundan Liu,Xianghua Wu,Long Ren
Co-based compounds have attracted much attention due to their competitive catalytic activities. To enhance their intrinsic electrocatalytic activity, morphology engineering is one of the effective strategies. Hollow structures have fascinating properties due to their low density and high loading capacity. In this work, we introduce a Ga-based liquid alloy as a reactive template for the synthesis of varying Co-based hollow nanoparticles. The fluidity character of the Ga-based liquid alloy facilitates the large-scale production of nanoparticles via a top-down shearing process. The pre-installed active species (here is Zn) in the liquid alloy serve as a sacrificial source to quantitatively reduce Co2+ions and form Co-based compounds. Well-structured Ga/CoOOH core-shell nanospheres are thus successfully prepared, and more varied Co-based hollow nanoparticles can be obtained by post-treatment and reaction. Hollow structures can offer enhanced interfacial area and increased active sites, benefiting the catalytic performance. Among the prepared Co-based catalysts, CoSe2hollow nanoparticles exhibited the best oxygen evolution reaction (OER) activity with an overpotential of 340 mV at the current density of 10 mA/cm2. This work provides a novel strategy for the rational design and simple preparation of hollow nanoparticles.Keywords:liquid metal;hollow structure;transition-metal compounds;electrocatalyst
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Hui Xu,Pengdong Chen,Yuanqiang Zhu,Yuanhai Bao,Ji Ma,Xuefang Zhao,Yong Chen
Because of high electrical conductivity, theoretical capacity, and numerous redox pairs, NiCo 2 S 4 has sparked a lot of interest in energy storage. In the paper, with citric acid as inductive agent, NiCo 2 S 4 mesoporous microspheres have been successfully prepared via solvothermal approach by regulating the solvent ratio (water/ethanol ratio = 1/3). It reveals that citric acid dominate in the nucleation and orientated growth of NiCo 2 S 4 and the morphology of NiCo 2 S 4 with different submicron structures can be tuned by the ratio of water/ethanol. The morphology, structure, and electrochemical properties of all NiCo 2 S 4 samples have been investigated. Among these samples, NiCo 2 S 4 mesoporous microspheres display the best electrochemical properties due to their unique mesoporous structure and high specific area. It has a high discharge capacity of 857C/g at a current density of 1 A/g, and exhibit exceptional rate capability (80 % retention even at 20 A/g). Additionally, when employed as positive of an asymmetric NiCo 2 S 4 //active carbon (AC) supercapacitor, it yields an energy density of 48.7 Wh kg −1 at 801 W kg −1 and 81 % capacity retention after 10,000 cycles at a current density of 5 A/g. The work describes a quick and easy way to increase the performance of NiCo 2 S 4 electrode materials and demonstrates its potential in practical application.
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ENVIRONMENTAL TECHNOLOGY
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2022
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IF 3.475
Mingxing Chen,Qinming Guo,Jinping Cui,Weiyang Lv,Yuyuan Yao
Developing high-performance adsorbent for hexavalent chromium (Cr(VI)) elimination presents an enticing prospect in environmental remediation. Herein, three-dimensional flowerlike nanospheres composed of molybdenum disulphide and polypyrrole (MoS2@PPy) were successfully prepared via a one-pot hydrothermal and subsequent carbothermal reduction process for the removal of Cr(VI). The effects of pH, adsorbent dosage, co-existing ions, initial Cr(VI) concentration and temperature were investigated systematically by batch experiments. Benefiting from the incorporation of MoS2, the obtained MoS2@PPy composites showed a dramatic increase of specific surface area (149.82 m2·g−1) and adsorption capacity (230.97 mg·g−1) when compared with the pure PPy nanoparticles. Based on the thermodynamics study and X-ray photoelectron spectroscopy analyses, the removal process of Cr(VI) was proved to be exothermic and spontaneous, and accessible under-coordinated Mo(IV) and pyrrolic N groups coupled with redox reactions were conducive to the efficient removal of Cr(VI). Attractively, the MoS2@PPy acted as the electron donor could also activate peroxymonosulphate for the efficient degradation of organic contaminants. These results suggested that the MoS2@PPy was promising in Cr(VI) elimination and other kinds of organic pollutants removal in wastewater.
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OPTICAL MATERIALS
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2022
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IF 3.754
Yarong Gu,Yutao Jiang,Jingqi Chen,Chenqi Gao,Lingyan Feng,Jinbo Wu,Lijuan Zhao
Chiral inorganic nanomaterials provide a platform for a variety of applications. Chiral ligands are commonly used to induce chiroptical activity of nanoparticles through chiral transfer, while few materials have intrinsic chirality and the origins of their chirality are unclear as well. Here, several hexagonal copper sulfide (CuS) structures with achiral morphology which showed negative circular dichroism (CD) signals are reported. Although these CuS structures had variable maximum of anisotropic g-factor, the wavelength dependence of g-factor due to the structure-dependent chiroptical activity were similar for all these CuS structures, indicating that the negative CD activity could derive from some common microstructure in CuS. The simulation based on density functional theory (DFT) and time-dependent DFT (TDDFT) revealed that the CD may originate from (Cu 3 S 3 ) 2 nanostructure existing in hexagonal CuS. The enantio-selective catalysis of these homochiral CuS structure for oxidation of d -DOPA and l -DOPA was also investigated. All samples exhibited preferential catalysis of l -DOPA, which is conducive to distinguishing l -DOPA from d -DOPA. This work not only reveals the origin of CD in CuS inorganic structures with achiral morphology for the first time, but also provides a profound insight of applications of homochiral CuS structures in catalysis.
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HYDROMETALLURGY
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2022
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IF 4.217
Chaopeng Liu,Zhongxian Song,Yanli Mao,Xiaole Yan,Zhaoyang Li,Yuzhong Liu,Mengxia Ma,Haiyan Kang,Xu Yan,Deming Gu,Xia Zhang,Zhenzhen Huang
A thiourea-modified weak base anion exchange resin, ZGA451 (thiourea@ZGA451), was prepared. Thiourea@ZGA451 exhibited excellent potential for Au(III) adsorption. The maximum adsorption capacity of Au(III) by thiourea@ZGA451 was 995.6 mg/g at 298 K. The adsorption process followed the Freundlich and pseudo-second-order models, which are monolayer and chemisorption adsorption, respectively. The adsorption mechanism of Au(III) on thiourea@ZGA451 involves electrostatic attraction, chelation, and redox. Thermodynamic experiments showed that the reaction exhibited spontaneous endothermic behavior. Thus, thiourea@ZGA451 possesses outstanding Au(III) adsorption properties.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Hongshan Wang,Zhenzhen He,Qiangbin Yang,Guangyong Zeng,Zhaomei Yang,Shengyan Pu
MXene nanosheets were functionalized by introducing sodium lignosulfonate (LS) containing abundant hydrophilic groups (sulfonic acid groups and phenolic hydroxyl groups), along with the intercalation of MoS 2 nanosheets between the functionalized MXene layers. A pressure-assisted self-assembly was utilized for the fabrication of a two-dimensional (2D) MXene membrane with high water permeation and excellent dye separation characteristics. The MoS 2 @LS-MXene composite membrane has excellent pure water flux (188.1 L·m -2 ·h -1 ), which is 85% higher than that of the unfunctionalized MXene membrane, and has a good rejection effect on dye molecules (93% for Congo red (CR), and 99% for Rhodamine B (RhB)). The appropriate interlayer spacing and negative surface charge resulted low rejection of salts (4.2% of NaCl, 4.6% of Na 2 SO 4 ) in dye-salt hybrid system, consequently leading to their mutual separation. The composite membrane also exhibits excellent stability and anti-fouling ability. This study provides a simple and novel design idea for the preparation of high-performance 2D MXene membrane.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Chaopeng Liu,Yanli Mao,Zhongxian Song,Yilong Yang,Xu Yan,Haiyan Kang,Yuzhong Liu,Deming Gu,Xia Zhang,Xiaole Yan
Thiourea-modified Cu 2 O (Cu 2 O-TU) was prepared by a facile route and used for the selective recovery of gold in acidic solution. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis elucidated that Au (III) ions were adsorbed onto the surface of Cu 2 O-TU via the electrostatic attraction of surface protonated amines groups (-NH 3 + ) with AuCl 4 - and the chelating interaction of pyrrole-type nitrogen as well as C S groups in the pH range of 1.0 – 5.0. Subsequently, partial adsorption of Au (III) was reduced to Au (I) and Au (0), while pyridine-type nitrogen was oxidized to -NO, which accelerated the adsorption rate of Au (III). The adsorption equilibrium time was about 2 min and the adsorption capacity was 79.7 mg·g −1 at a pH value of 2.0 in 40 mg·L −1 Au (III) solution. The fitted result of gold adsorption by the Langmuir model was 1529.4 mg·g −1 at 318 K. The experimental data conformed to the pseudo-second-order model, indicating that the adsorption process was chemisorption . After 5 cycles, the capability of adsorption only decreased by 7.43%, which provided a great possibility for its application in solutions. Besides, Cu 2 O-TU showed specific and selective adsorption ability for Au (III) in the outdoor environment .
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REACTIVE & FUNCTIONAL POLYMERS
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2022
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IF 4.966
Qian Liu,Zijie Fan,Xibin Yi,Shiwei Chen,Bing Li,Weiyue Luo
The polyimide is a promising semiconductor photocatalyst . However, its photocatalytic activity is poor because of its small specific surface area, low visible light absorption and easy recombination of photoexcited electron and hole. Herein, porous polyimide/carbon quantum dots/ZnS quantum dots material aerogel with excellent photocatalytic performance is prepared via supercritical fluid drying technology. The material aerogel has large surface area and the structure is porous network. The carbon quantum dots increase the visible light absorption of the polyimide aerogel . The ZnS quantum dots change the VB edge, CB edge and band gap of the polyimide aerogel. Both carbon quantum dots and ZnS quantum dots could improve the charge transfer and facilitate the separation of photoexcited electron and hole. The visible-light photocatalytic performance over oxytetracycline of porous polyimide/carbon quantum dots/ZnS quantum dots material aerogel is increased largely compared to pure polyimide aerogel. The photocatalytic degradation mechanism of the polyimide material aerogel is proposed. ·O 2 − and h + play the key role in the photocatalytic degradation. This work supplies an effective method to prepare visible-light photocatalytic materials.
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CELLULOSE
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2022
·Vol. 29
·期 15
·8133-8150
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IF 6.123
Sun Liangyun,Han Juan,Tang Chaofan,Wu Jiacong,Fang Sihan,Li Yuanyuan,Mao Yanli,Wang Lei,Wang Yun
As an effective substitute for ionic liquids (ILs), deep eutectic solvents (DESs) are known as a new generation of green solvents. In addition, DESs are considered to be the best solvents to replace traditional organic solvents and ILs due to their advantages of economy, simple preparation and biodegradability, which can be used to further break through the technical bottleneck in the field of biomass pretreatment. This study synthesized a series of choline chloride-based (ChCl-based) DESs and used them to pretreat microcrystalline cellulose (MCC) without dissolution, in order to achieve the purpose of improving the saccharification effect. DES-9 (ChCl/hydroquinone), DES-12 (ChCl/acetamide) and DES-16 (ChCl/acetic acid) were better pretreatment solvents. The optimum conditions for the pretreatment of MCC by DES-9 and DES-12 were both at 110 °C for 4 h, and the optimum condition of DES-16 was at 90 °C for 4 h. Compared with untreated MCC (26.66%), the saccharification yield of pretreated MCC with DES-16 increased by 20.5%. Finally, the structure and morphology changes of MCC before and after pretreatment were investigated in detail through the degree of polymerization (DP), SEM and enzyme adsorption. The results showed that DESs pretreatment made the surface of MCC become rough, which enhanced the accessibility of cellulose and enzymes, improving the saccharification effect. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Yingxia Dong,Xiaoqiu Yue,Yu Liu,Qiaoji Zheng,Zhiqin Cao,Dunmin Lin
High-performance supercapacitors have attracted considerable interests due to their high-power density, fast charge/discharge process and long cycle life. However, the wide application of supercapacitors is limited by their low energy density. Herein, the hierarchical core–shell structured NiCoP@NiS nanoarrays have been successfully synthesized by using the vertically grown nickel–cobalt bimetallic phosphide (NiCoP) nanowire as the core and the nickel sulfide (NiS) by electrodeposition as the shell. As the “super channel” for electron transfer, the NiCoP core is coupled with the NiS shell to promote rapid diffusion of electrons and improve cycle stability of the electrode. Consequently, the optimized NiCoP@NiS nanoarrays display an extremely good specific capacitance (2128F g -1 at 1 A g -1 ) and a superior long cycle life (the capacitance retention of 90.36 % after 10,000 cycles). A hybrid supercapacitor (HSC) has been assembled using the NiCoP@NiS as the positive and the activated carbon (AC) as the negative, which displays a superior energy density of 30.47 Wh kg −1 at a remarkable power energy of 800 W kg −1 . This study shows that the prepared hierarchical core–shell structured nanoarrays have great prospects as a novel electrode material in energy storage.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Ziyu Xue,Dehong Bai,Yu Li,Qiankun Zhang,Tao shao,Peiqing Guo,Dongxia Zhang,Xibin Zhou
In this work, a simple strategy for the rapid detection of Ag + based on nitrogen, sulfur doped graphene quantum dots (N, S-GQDs) decorated platinum nanoclusters (PtNCs) was proposed for the first time. N, S-GQDs decorated PtNCs (N, S-GQDs@PtNCs) were prepared by a reduction method using ascorbic acid (AA) as reducing agent and N, S-GQDs as a stabilizer and morphology directing reagent, respectively. The N, S-GQDs@PtNCs have an excellent peroxidase activity, which could catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 to lead to an obvious color change. However, Ag + could be reduced to Ag 0 by N,S-GQDs, and the Ag 0 covered the surface of N, S-GQDs@PtNCs causing its peroxidase activity to decrease. Ag + concentration could be quantified by measuring the maximum absorption signal at 652 nm for oxidized TMB with a wide linear range of 0.5–300.0 nM and a limit of detection (LOD) as low as 0.2 nM. In addition, satisfactory results were obtained for the detection of Ag + in actual water samples. The prepared colorimetric sensor had advantages such as simple operation, cost-effective, fast response, and visualization, and had great potential in detecting toxic Ag + in environmental.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Xiaoqing Yang,Huimin Xiang,Jianying Huang,Chuan Zhou,Ran Ran,Wei Wang,Wei Zhou,Zongping Shao
Lead-free inorganic Cs 2 AgBiBr 6 double perovskites have emerged as promising materials in perovskite solar cells (PSCs) to tackle the inferior stability and toxicity issues of organic–inorganic hybrid PSCs. However, the power conversion efficiencies (PCEs) of Cs 2 AgBiBr 6 solar cells are remarkably restricted by the intrinsic and extrinsic defects of Cs 2 AgBiBr 6 films. More specifically, the fast crystallization process in the formation of Cs 2 AgBiBr 6 films strongly prevents the homogeneous growth of perovskite crystals, leading to inferior Cs 2 AgBiBr 6 film quality. This work introduces a facile strategy to retard the crystallization of Cs 2 AgBiBr 6 perovskites by introducing Lewis base additives into the precursor solution. The incorporation of a strongly coordinated thiourea additive with a sulfur donor leads to the generation of a Lewis acid base adduct, which retards the crystallization process for Cs 2 AgBiBr 6 crystals, improves the quality of the Cs 2 AgBiBr 6 film, decreases the defect density and inhibits charge carrier recombination. After optimization, the cell delivers a superior PCE of 3.07%, surpassing that reported for most Cs 2 AgBiBr 6 -based solar cells in the literature, and exhibits outstanding stability with a PCE retention rate of 95% after 20 days of storage in air. This work provides an effective strategy for further improvements in the performance of inorganic lead-free Cs 2 AgBiBr 6 -based photovoltaic cells .
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