VACUUM
·
2022
·
IF 4.11
Dafeng Gao,Dayi Jiao,Fuming Chen,Yuheng Liang,Yinzhen Wang,Guannan He,Wei Li,Qinyu He
In this study, SnS 2 /S-doped g-C 3 N 4 (Sg-C 3 N 4 ) composite with SnS 2 and Sg-C 3 N 4 in the weight ratio of 9:1 was prepared by a hydrothermal method . For comparison, composites of SnS 2 /Sg-C 3 N 4 with weight ratios of 9:0.05 and 9:1.5, pure SnS 2 , Sg-C 3 N 4 , and g-C 3 N 4 were also prepared using the same processing parameters. Microstructural characterization showed that nano-sized SnS 2 particles were deposited on Sg-C 3 N 4 to form a Z-scheme photocatalyst . The chemical valence of the doped S in Sg-C 3 N 4 was +6, allowing the surface of Sg-C 3 N 4 in the composite to be considerably uneven for the deposition of SnS 2 . The uneven surface of Sg-C 3 N 4 resulted in a rough surface of the SnS 2 /Sg-C 3 N 4 composite, which significantly enhanced the specific surface area and light absorption over a wide wavelength range of 200–1000 nm. The carrier transfer capability and lifetime of g-C 3 N 4 were improved after S doping. The lifetime and transfer ability of the photoproduced carriers in the composite were improved by the Z-scheme heterojunction . Consequently, the rate constant of the composite is thrice that of pure SnS 2 and 57 times that of Sg-C 3 N 4 . This work demonstrates a novel route to enhance light absorption over a wide wavelength range: depositing a semiconductor on a base semiconductor with an uneven surface charge distribution can produce a composite with a rough surface, i.e., a large specific surface area.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Feng Cheng,Yongfei Tong,Yang Liu,Yue Yuan,Zhiqiang Chen,Juan Liang,Yongli Zhang,Peng Zhou,Xiaoguang Duan,Bo Lai
In this study, vanadium powder (V) was employed as a cocatalyst to enhance the Fenton-like system. The V-Fe(III)/H 2 O 2 system can rapidly produce hydroxyl radicals and completely oxidize chloramphenicol with exceptionally high stability for long-term operation. The low-valent vanadium sites on the surface during the stepwise oxidation of vanadium from V 0 to V(IV) can donate electrons for direct H 2 O 2 activation and indirect Fenton reaction by reducing Fe(III) to produce hydroxyl radicals. Meanwhile, density functional theory (DFT) calculation unveils that low-valent vanadium sites of vanadium can lengthen Fe-O bonds of FeOH 2+ to elevate the oxidation potential of Fe(III) and promote Fe(III) reduction induced by H 2 O 2 . The self-cleaning effect of vanadium under acidic conditions can maintain reactive sites for sustainable electron donation and long-lasting enhanced Fenton oxidation. This study provides a novel enhanced Fenton oxidation for water remediation and the first mechanistic insights into the origins of V-based advanced oxidation technologies , it may also be beneficial to treat vanadium-contained wastewater.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Shuang Meng,Minglu Sun,Peng Zhang,Chenying Zhou,Chuanshu He,Heng Zhang,Yang Liu,Zhaokun Xiong,Peng Zhou,Bo Lai
The continuous electron supply for oxidant decomposition-induced reactive oxygen species (ROS) generation is the main contributor for the long-standing micropollutant oxidation in the iron-based advanced oxidation processes (AOPs). Herein, as a new class of co-catalysts, metal borides with dual active sites and preeminent conductive performance can effectively overcome the inherent drawback of Fenton-like reactions by steadily donating electrons to inactive Fe(III). Among the metal borides, tungsten boride (WB) exhibits a significant co-catalytic performance run ahead of common heterogeneous co-catalysts and exceptionally high stability. Based on qualitative and semi-quantitative tests, the hydroxyl radical, sulfate radical, and iron(IV)-oxo complex are all produced in the WB/Fe(III)/PDS system and Fe(IV)-induced methyl phenyl sulfoxide decomposition is up to 72%. Moreover, the production efficiency of ROS and relative proportions of radical and nonradical pathways change with various experimental conditions (dosages of PDS, WB, and solution pH) and water matrices. The rate-determining step of Fe(II) regeneration is greatly accelerated resulting from the synergetic effect between exposed metallic reactive sites and nonmetallic boron with reductive properties of WB. In addition, the self-dissolution of surface tungsten oxide and boron oxide leads to a renovated surface for sustainable Fe(III) reduction in long-term operations. Our discovery provides an efficient and sustainable strategy in the field of enhanced AOPs for water remediation.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xueling Wang,Xuming Zhang,Yifan Xu,Hao Song,Xingrui Min,Zihuan Tang,Chaoran Pi,Jianping Li,Biao Gao,Yang Zheng,Xiang Peng,Paul K. Chu,Kaifu Huo
The development of earth-abundant electrocatalysts with Pt-like catalytic activity for the hydrogen evolution reaction (HER) is of great significance to green hydrogen production . Herein, a novel strategy is described to construct dual-phase nitride nanobelts composed of Mo 2 N and Ni 0.2 Mo 0.8 N by nitridation of Ni 2+ intercalated layered MoO 3 nanobelts (NBs). The Mo 2 N/Ni 0.2 Mo 0.8 N catalyst exhibits superior stability and a low overpotential of 26 mV at 10 mA cm −2 and Tafel slope of 31 mV dec −1 in both the alkaline electrolyte and simulated seawater, which is comparable to or better than that of the benchmark Pt/C catalyst. The excellent alkaline HER characteristics is attributed to the Mo 2 N/Ni 0.2 Mo 0.8 N heterostructure with adjustable content and robust interfaces and without metal Ni segregation and structure collapse during nitridation. Density-functional theory (DFT) calculations and experiments reveal that the Mo 2 N/Ni 0.2 Mo 0.8 N interface with strong electronic interactions optimizes H adsorption/desorption yielding moderately weak bonding metal sites with positive ΔG H* as the catalytic centers, thereby accelerating the HER kinetics and boosting the HER activity. The results reveal a simple strategy for the preparation of heterostructured nitride-based catalysts with Pt-like activity for hydrogen evolution.
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高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Chenchen Zhao,Dongbo Wang,Zhi Zeng,Bingke Zhang,Jingwen Pan,Donghao Liu,Sihang Liu,Shujie Jiao,Gang Liu,Zhikun Xu,Liancheng Zhao,Jinzhong Wang
Over-consumption of limited fossil fuels has caused serious environmental pollution and a global energy crisis, threatening human life and biodiversity. As an ideal, environmentally friendly renewable energy, hydrogen can satisfy human clean energy requirements. Therefore, whether hydrogen can be catalytically generated in the wastewater treatment process is a highly meaningful investigation. Herein, Bi 2 Te 3 /Te/C heterojunction nanowires with high specific surface area and rich pore structure were successfully synthesized. The efficient catalytic degradation process is accompanied by the generation of hydrogen. The catalytic degradation of methylene blue and methyl orange was achieved in less than 20 s and 150 s, respectively. Meanwhile, in scaled-up degradation/hydrogen production experiments, fast and efficient H 2 production from NaBH 4 can be realized in the presence of Bi 2 Te 3 /Te/C nanowires. The mechanism of efficient synergistic organic dye degradation and hydrogen production is due to the efficient carrier transfers and accumulation at the hetero-interface. In contrast to previous work, rapid degradation of organic dyes and hydrogen production by decomposition of NaBH 4 were achieved without the help of high-cost catalysts such as precious metals. This work could provide an alternative pathway for the future degradation of organic matter in synergistic heterogeneous catalytic wastewater and recovery of by-products including hydrogen.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 2
·e53301
·
IF 3.057
Wenwen Wu,Qingquan Song,Junrong Yu,Na Li,Zuming Hu,Yan Wang,Jing Zhu
The high-performance polymer para-aramid (PPTA) is discovered to gel too soon during the polymerization process, resulting in poor processing performance. In this work, a homogeneous polymer solution containing heterocyclic para-aramid (HPPTA) was successfully synthesized by introducing 2,4-aminophenyl-5-aminobenzimidazole groups into the molecular chains of PPTA, and then HPPTA aerogel was prepared using a supercritical drying technique that took advantage of the HPPTA solution's excellent property of slow gelation. When the HPPTA polymer mass fraction was 1 wt%, the aerogel had the lowest density of 0.086 g cm −3 with a BET specific surface area of 376.59 m 2 g −1 . The HPPTA-2 aerogel had better adsorption performance for anionic dye methyl orange, with a maximum adsorption capacity of 319.47 mol g −1 ; however, its adsorption capacity for cationic dye methylene blue and neutral dye dimethyl yellow was very low, at only 19.68 and 0 mol g −1 , respectively. The selective adsorption ability of HPPTA aerogel made it a simple and scalable platform for removing anionic dyes from water solutions. Furthermore, the HPPTA aerogel has outstanding thermal properties for thermal insulation applications in severe environments due to the synergistic effect of the 3D porous structure inside the aerogel and the exceptional thermal stability of the HPPTA.
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高影响因子
Electronic Materials Letters
·
2022
·Vol. 19
·期 1
·94-107
·
IF 3.151
Luo Menghao,Feng Hange,Hu Yuechuan,Chen Keke,Dong Zibo,Xue Shaolin
Abstract Photocatalytic degradation has received considerable emphasis since it shows significant possibilities in environmental pollution. In this work, ternary Z-scheme heterojunction g-C 3 N 4 /TiO 2 /Ti 3 C 2 photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C 3 N 4 and TiO 2 dramatically modify the photocatalytic performances of the compound under illumination. Meanwhile, in this process, multilayer Ti 3 C 2 , as the transport medium of Z-scheme heterojunction, is tightly bonded to TiO 2 generated by hydrothermal oxidation and g-C 3 N 4 with large specific surface area, which effectively facilitates the space charge separation and depresses the charge recombination. When the addition amount of TiO 2 /Ti 3 C 2 is 80 mg and calcined at 450 ℃ for 4 h, g-C 3 N 4 /TiO 2 /Ti 3 C 2 has the greatest photocatalytic performance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C 3 N 4 and 14.55 times that of Ti 3 C 2 , respectively. This work illustrates that g-C 3 N 4 /TiO 2 /Ti 3 C 2 has outstanding potential and offers novel insights for designing and synthesizing new ternary heterojunction materials. Graphical Abstract
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高影响因子
CORROSION SCIENCE
·
2022
·
IF 7.72
Jin Huang,Jian Zhang,Tingting Luo,Ruxia Liu,QinQin Wei,Guoqiang Luo,Qiang Shen
Corrosion test of Mo in LiF-LiCl-LiBr salt with different SO 4 2 content have been studied. MoO 2 , Mo 3 S 4 and MoS 2 was formed after corrosion. The SO 4 2- will corrode the grain boundary of Mo and lead to the decomposition of large Mo grain. Moreover, the formation of different corrosion products will lead to significant changes in volume and destroy the stable oxide layer which could be protective. The Mo will be severely corroded in LiF-LiCl-LiBr molten salt with a higher content of SO 4 2- .
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22639-22649
·
IF 3.925
Doudou Wang,Haiyan Zhang,Ye Zhang,Zhixuan Huang,Lili Li
The design of organic photocatalysts with visible-light-response is an important way to solve energy crisis and environmental pollution. Polypyrrole (PPy) as one of the conjugated polymers is a prospective photocatalyst material due to its excellent optical properties, easy synthesis and high environmental stability. In this work, polyacrylonitrile (PAN) and g-C3N4 were electrospun as a fiber membrane matrix. PPy was coated on the matrix by in situ polymerization of a pyrrole monomer using doped Fe3+ as an oxidant. PPy exhibited a broadband visible light absorption region and a narrow band gap which was conducive to improve visible light utilization. The separation efficiency of photogenerated e−–h+ pairs was improved by constructing a heterojunction between PPy and g-C3N4. The doping of Fe3+ as an electron scavenger further prevented the recombination of carriers. The PAN/g-C3N4-PPy-Fe3+ membrane showed highly efficient removal performance for both cationic and anionic dyes. Moreover, PAN/g-C3N4-PPy-Fe3+ exhibited excellent recyclability and stability. This work outlined an approach for designing a novel conjugated polymer based multi-component composite photocatalyst with visible light response.
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高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 19
·期 5
·2437-2449
·
IF 2.328
Chaoqun Xia,Shi Liu,Baining Cui,Mingjun Li,Hongshui Wang,Chunyong Liang,Phong A. Tran,Yan Wang,Huan Zhou,Lei Yang
Development of reliable ultraviolet (UV) blockers is crucial for UV radiation protection applications such as sunscreen and UV-resistant fabric. To date, zinc oxide (ZnO) has been extensively used as a physical UV blocker worldwide but has also been criticized for with its unfavored UV-induced reactive oxygen species (ROS) generation phenomena. As an attempt to suppress the photocatalytic activity of ZnO without compromising its UV absorbance property, amorphous selenium (Se) nanoparticles (NPs) were incorporated to ZnO using a facile and cost-effective coprecipitation method. Additionally, this process also enables an economical synthesis route for harvesting amorphous Se NPs from an aqueous medium. The ZnO–Se composites were thoroughly characterized to confirm its enhanced UV absorptivity combined with high transparency in the visible light range and to understand the interaction between ZnO and Se. Besides, Se-induced photocatalytic activity suppression of ZnO was demonstrated using methylene orange as an indicator. In vitro study revealed that ZnO–Se composite had improved biocompatibility over ZnO but comparable bacteriostasis ability under full-spectrum light irradiation. These results suggest that ZnO–Se composite is a promising UV blocker with advantages of facile synthesis, UV-induced ROS generation diminishment and biocompatibility.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 8
·895
·
IF 4.501
Pengzuo Chen,Weixia Huang,Kaixun Li,Dongmei Feng,Yun Tong
The development of highly active non-precious metal electrocatalysts is crucial for advancing the practical application of hydrogen evolution reaction (HER). Doping engineering is one of the important strategies to optimize the electrocatalytic activity of electrocatalysts. Herein, we put forward a simple strategy to optimize the catalytic activity of MoO3material by incorporating the Cu atoms into the interlayer (denoted as Cu-MoO3). The prepared Cu-MoO3nanosheet has a larger surface area, higher conductivity, and strong electron interactions, which contributes to optimal reaction kinetics of the HER process. As a result, the Cu-MoO3nanosheet only needs a small overpotential of 106 mV to reach the geometric current density of 10 mA cm−2. In addition, it also delivers a low Tafel slope of 83 mV dec−1, as well as high stability and Faraday efficiency. Notably, when using the Cu-MoO3as a cathode to construct the water electrolyzer, it only needs 1.55 V to reach the 10 mA cm−2, indicating its promising application in hydrogen generation. This work provides a novel type of design strategy for a highly active electrocatalyst for an energy conversion system.Keywords:MoO3nanosheet;Cu doping;electronic regulation;hydrogen production;water electrolyzer
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 39
·2206053
·
IF 19.924
Zhi Zhang,Ziming Xiong,Yao Yao,Derong Wang,Zhiqian Yang,Pin Zhang,Qing Zhao,Wenke Zhou
Electronic devices have brought huge convenience to daily lives; however, a large amount of electromagnetic radiation pollution is generated. Therefore, an urgent demand for electromagnetic wave absorbing materials featuring “low thickness, wide frequency band and strong absorption” is put forward. Here, a strategy of introducing a conductive carbon nanotubes (CNTs) network into CH 3 NH 3 PbI 3 (MAPbI 3 ) is developed to construct an electromagnetic wave absorbing system. As the absorption center, MAPbI 3 dominates the absorption band via an electric polarization process. Meanwhile, the CNTs construct an efficient conductive network, which supply a transmission path for free electrons inside the MAPbI 3 crystals and enhance conduction loss. In comparison with the insulated network formed by MoO 3 /MAPbI 3 , it is speculated that the broadened absorption bandwidth and reduced absorption thickness originate from the conductive network of CNTs. As a result, when the CNTs is 7.7% (mass ratio), the reflection loss strength of MAPbI 3 /CNTs reaches −57.71 dB at 13.96 GHz and the corresponding effective absorption bandwidth is 6.32 GHz (11.68–18.00 GHz), with an absorber thickness of 1.96 mm. The method of constructing conductive network proves a great potential of hybrid perovskite in the field of electromagnetic wave absorption and provides feasible strategies for the absorption regulation of dielectric loss-type materials.
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