Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Longfei Zhao,Xin Chen,Yuan Zhang,Zhupeng Ye,Yanwei Zeng
In this paper, controllable nucleation and growth of CdS nanodots on the (020)-featured WO 3 ·H 2 O nanoplates has been successfully accomplished to prepare CdS-WO 3 ·H 2 O heterojunction with high-quality interfacial contact through a slow release of Cd 2+ and S 2- from the gradual self-loop hydrolysis of cadmium acetate and thioacetamide. The chemical and structural characteristics of as-prepared samples before and after heat treatment are detailedly investigated by TG-DSC, XRD, Raman, XPS, FESEM and HRTEM, as well as their light absorption performance from UV-Vis DRS. The maximum average hydrogen production rate for CdS-WO 3 ·H 2 O reaches 2.15 mmol·g −1 ·h −1 under 300 W Xe lamp irradiation (λ > 420 nm) using lactic acid as sacrificial reagent, which is 8.27 and 2.72 times as much as CdS and CdS-WO 3 , respectively. According to band alignment, CdS-WO 3 ·H 2 O exhibits greater energy difference of Fermi level than CdS-WO 3 , and augmented photocatalytic performance should arise from efficient Z-scheme charge transfer mechanism under stronger built-in electric field, in which the conduction band electrons of WO 3 ·H 2 O and valence band holes of CdS are expected to effectively recombine at their interfacial zones, while the conduction band electrons of CdS and valence band holes of WO 3 ·H 2 O contribute to the reduction of H + and oxidation of lactic acid.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 128
·期 1
·1-14
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IF 2.584
Chen Peng,Wu Keliang,Peng Xiang,Ma Yue,Yang Xuqi,Duan Xinping,Ma Yan,Liu Zhiyong
Hydrogen and oxygen production based on photocatalytic monolithic water splitting is considered to be one of the effective ways to produce sustainable and clean energy. The key challenge in this process is to develop new photocatalysts that can simultaneously produce H 2 and O 2 at a stoichiometric ratio of 2:1 without the use of any sacrificial agents. In order to solve this problem, highly efficient and ingenious photosystems in nature have been studied intensively. Herein, we prepared printable Z-type composite photocatalysts CdS@TiO 2 /Pt/ITO/WO 3 /Co 3 O 4 mimicking biological vegetative leaves in nature and constructed an “artificial leaf” device that completely decomposes water. We use an electron solid penetrating transporter ITO, which can rapidly transfer photogenerated electrons and photogenerated holes and reduce the compound rate of photogenerated carriers. Thus, the efficiency of photocatalytic total water dissolution is enhanced. This photocatalyst was able to produce both H 2 and O 2 in water with an H 2 production rate of 75.93 μmol g −1 h −1 and an O 2 production rate of 36.49 μmol g −1 h −1 . We designed the oxygen-producing photocatalyst WO 3 /Co 3 O 4 , which produced oxygen at a rate of 159.21 μmol g −1 h −1 6 times higher than that of WO 3 alone. Furthermore, the morphology, composition, and microstructures of the photocatalyst were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and nitrogen adsorption–desorption.
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OPTICAL MATERIALS
·
2021
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IF 3.08
Hui Zhao,Jihai Duan,Pengxia Sun,Zisheng Zhang,Weiwen Wang
Black Ti 3+ self-doping TiO 2 nanotubes (BTNT) have attracted widespread attention due to their abilities to enhance visible light response and photo-generated electron-hole separation without introducing impurity particles. However, due to the poor stability of Ti 3+ , the doping of a large amount of Ti 3+ is a huge challenge. In this work, we have taken a different approach, and the black Ti 3+ self-doping TNT-Ag-WO 3 (BAW) photocatalyst was prepared. The BAW Z-scheme photocatalytic (PC) system was successfully constructed. Compared with TNT's PC system (degrade 40.56%), BAW Z-scheme PC system can degrade 97.67% with 20 mg/L MB wastewater after 120 min. By introducing a large number of Ti 3+ and O vacancies, the inherent active group is mainly converted from the holes and.OH on the WO 3 valence band and.O 2 − on the TiO 2 conduction band , which improved the stability of O vacancies.Before and after the reaction, the reduction of Ti 3+ in BTNT is about 30 times that of Ti 3+ in BAW. This work provides a reference and basis for constructing Z-scheme heterojunction on BTNT, and also provides new ideas for improving the stability of Ti 3+ and O vacancies in self-doped TiO 2 .
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Jialin Cai,Wenlei Zhang,Yanyan Liu,Ruofan Shen,Xin Xie,Wanyu Tian,Xingang Zhang,Jie Ding,Yushan Liu,Baojun Li
The development of high-efficiency pH-universal electrocatalyst is of great significance for hydrogen evolution reaction (HER). In this work, a rod-like Ru/WO 3 -V O electrocatalyst was constructed for HER via a solid-phase reaction strategy. Due to the restriction of atomic migration at solid phase interface, plenty of oxygen vacancies (V O ) and structure distortions were generated in amorphous/crystalline WO 3 phase (WO 3 -V O ). The optimized Ru/WO 3 -V O annealed at 450 °C with 2.2 wt % Ru achieves outstanding intrinsic activity with low overpotential and Tafel slope in a 0–14 pH range. A turnover frequency value 7.2 higher than that of commercial Pt/C is abtaind on Ru/WO 3 -V O at overpotential of 100 mV. Density functional theory calculations reveal that H* adsorption and desorption balanced by tuning the interface electronic structure contributes synergistic effect to the pH-universal HER activity of Ru/WO 3 -V O . The crystalline/amorphous semiconductor-metal heterointerface is crucial to designing and synthesizing electrocatalysts for optimal HER activity.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Xueying Wang,Qian Ma,Yi Wang,Dongheng Zhao,Lingyu Li,Huayushuo Zhang,Bolong Li
This study originally reports the in-situ construction of porous WO 3 /FeWO 4 ribbon-like hierarchical composites with unique and intense heterojunction interface behavior and the enhanced adsorption and carrier transport capability for effectively detecting n-butanol at room temperature. The introduction of different adding amounts of MIL-101 plays the key role of the morphological evolution of WO 3 -based microstructures with the well-distributed nanoparticles in situ growth on the surface by a facile electrospinning and subsequent calcination process. Compared with pristine WO 3 , a sharp and useful reduction of the optimal operating temperature from 220 to 25 °C can be observed as the Fe component increasing, mainly owing to the inverted p-type gas sensitive response caused by the controllable variable of FeWO 4 phase in the multiple effective WO 3 -FeWO 4 heterojunctions . The optimal WO 3 /FeWO 4 composites can display the highest response of 12.3 and a relatively short response/recovery times of 110/140 s to 100 ppm n-butanol at 25 °C, together with the superior gas selectivity, repeatability, humidity and long-term stability. Density functional theory (DFT) simulation is employed for verifying the significant adsorption interaction and charge transfer between n-butanol molecule and WO 3 /FeWO 4 . Regular distribution of WO 3 -FeWO 4 heterojunction interfaces can not only determine the collaborative modulation of electronic structures, but also provide the efficient surface/interface transport mechanism for MIL-101 induced one-dimensional (1D) hierarchical ribbons. Actually, the integrated gas-sensitive components based on WO 3 /FeWO 4 composites exhibit the rapid response characteristic under room temperature condition and provide a friendly strategy of optimizing the practical detection of ppm-level n-butanol for other inorganic heterogeneous sensors.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Tingting Zhu,Jinhang Yang,Yuxiang Shen,Ting Liang,Songyu Fan,Shiming Zhang,Zebin Yu,Shuangfei Wang,Yanping Hou
Z-scheme heterojunction photocatalysts can restrain carriers’ recombination while retaining high redox capacity. Herein, a novel ZnTe/rGO/WO 3 (ZRW) Z-scheme heterojunction was constructed for simultaneous removal of TC and Cu (II) from wastewater. The highly conductive rGO served as a bridge connecting the ZnTe and WO 3 whereby forming a tight interaction interface, beneficial to carriers transfer and separation. The removals of TC and Cu (II) using the optimized ZRW-10% achieved 90.6% and 89.5% within 150 min of light exposure, which were much higher than those from the ZnTe and WO 3 . Results of free radical trapping experiments and electron spin resonance analysis suggested that·O 2 - and·OH were the key active species for TC oxidation while e - dominated Cu (II) reduction. Based on the identified TC degradation intermediates, two possible degradation pathways for TC were proposed, and the ecotoxicity of most intermediates were less than TC. This study can advance research development of designing efficient Z-scheme photocatalyst and elimination of complex pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jianing Li,Juan Chen,Yanhui Ao,Xin Gao,Huinan Che,Peifang Wang
The construction of dual Z-scheme photocatalysts is an effective way to promote the separation and migration of electrons-holes as well as retain their high redox abilities. Herein, a distinctive dual Z-scheme photocatalyst based on phase junction WO 3 and CdS (CW) was successfully fabricated via hydrothermal method and in-situ precipitation process. The as-prepared materials showed the advantages of both phase junction and dual Z-scheme mechanism (promoted utilization of carriers and improved redox potential). As a result, the k app value of 75CW (0.05237 min −1 ) was 29.8 times that of phase junction WO 3 (0.00176 min −1 ) and 2.9 times that of CdS (0.01799 min −1 ) in terms of imidacloprid (IMD) degradation. Trapping experiment and electron spin resonance (ESR) proved the dual Z-scheme mechanism, the key to significantly improve photocatalytic degradation efficiency of WO 3 /CdS nanocomposites. Combined the analysis of liquid chromatography-mass spectrometry (LC-MS) with density functional theory (DFT) calculation, rational degradation pathways of IMD were put forward in detail. This work is excepted to provide new horizons for the construction of dual Z-scheme system with phase junction and the photodegradation of IMD.
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Advanced Materials Interfaces
·
2021
·Vol. 8
·期 7
·2002131
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IF 6.147
Dayong He,Yuying Ma,Rui Zhao,Ju Qiu,Bolun Sun,Hao Wang,Mei Yang,Xiaoteng Jia,Xiang Li,Yongxin Li,Xiaofeng Lu,Ce Wang
Faced with the presence of radiation sources in many different areas, researchers are beginning to focus on the development of personal protective equipment. The design and manufacture of lightweight, lead-free, and flexible X-ray shielding materials have recently become a challenge in materials science, whereas, high-Z materials, which are essential raw materials for high-performance X-ray protective fillers, are non-renewable, and their exploitation and utilization usually require long-term planning. In this study, a new route is demonstrated to the preparation of multifunctional polymer/high-Z material nanofibrous membrane through electrospinning and subsequent solvothermal processes. The resultant Bi 2 WO 6 /WO 3 /polyacrylonitrile hybrid nanofibrous membrane possesses a remarkable X-ray attenuating property with an attenuation rate of 90.10% at 30 keV and a mass attenuation coefficient of 2.97 cm 2 g −1 at 83 keV. In addition, the freestanding hybrid nanofibrous membrane also possesses excellent photocatalytic activities for the degrading of cationic water pollutants, showing promising potential in industrial wastewater treatment, and providing a new strategy for the design and applications of multifunctional and recyclable shielding materials.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Fang Feng,Hongfeng Hua,Lutao Li,Rongxi Xu,Jiayu Tang,Dejiang Dong,Jian Zhang,Xing’ao Li
Recently, two-dimensional (2D) g-C3N4 has attracted great interest for visible-light-driven H2 production. Thinning, doping, and reticulation have been demonstrated as effective strategies to improve the efficiency of photocatalysis, but are a challenge for structural stability. Herein, a targeted method was implemented by embedding the one-dimensional (1D) WO3 nanotubes matrix into the frameworks of 2D porous g-C3N4 to form a porous P-doped g-C3N4 nanosheets/WO3 nanotubes (PCNS/WNT) by a flexible electrostatic self-assembly process. As a visible-light-sensitive photocatalyst, the as-prepared hybrids exhibited impressive performance for hydrogen generation, which was attributed to the advantages of synergetic mechanism owing to a higher specific surface area, more reaction active sites, enhanced light absorption, and a better photogenerated carrier separation. Interestingly, the insertion of 1D WO3 nanotubes not only accelerates electrons transfer along the 1D channel but also provides robust support for 2D porous g-C3N4 architecture. As a result, the maximum photocatalytic H2 evolution rate of PCNW-50 is 547 μmol g–1 h–1, which is about four times higher than that of pure PCNS, and there is no significant reduction of H2 production after five cycles. Moreover, this 2D/1D PCNS/WNT hybrid was first reported in the area of photocatalytic hydrogen evolution and provides ideas for designing novel stable architecture of photocatalyst.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
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IF 9.038
Yan Zhang,Youzhi Ji,Jinhua Li,Jing Bai,Shuai Chen,Linsen Li,Jiachen Wang,Tingsheng Zhou,Panyu Jiang,Xiaohong Guan,Baoxue Zhou
The efficient removal of ammonia is a difficult issue in wastewater treatment because ammonia is easily converted to nitrate instead of N 2 . The oxidation of ammonia by chlorine radical (Cl ) is recognized as an effective method. However, the massive generation of toxic byproducts chlorate and nitrate pose great risk for its practical application due to the excessive oxidation capacity of hydroxyl radical. Herein, we propose a novel method to selectively generate Cl for efficient ammonia removal using BiVO 4 /WO 3 photoanode in a self-driven photoelectrocatalytic (PEC) system. Cl was predominantly produced by regulating the valence band edge of WO 3 though modifying BiVO 4 , which tuned the moderate oxidative force of hole to reduce OH generation and thereby inhibited the formation of chlorate and nitrate. The self-driven ammonia degradation was achieved by employing BiVO 4 /WO 3 and Si photovoltaic cells as composite photoanodes to improve light-absorption and electron-hole separation, thus enhancing Cl production. These results showed that 10 mg L −1 of ammonia-N was completely removed (99.3 %) in 120 min with 80.1 % of total nitrogen removal. Toxic byproducts chlorate and nitrate were inhibited by 79.3 % and 31 %, respectively, compared to WO 3 . This work provides new insights to develop efficient, energy-saving and environment-friendly method for ammonia pollution treatment.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Gongduan Fan,Rongsheng Ning,Zhongsen Yan,Jing Luo,Banghao Du,Jiajun Zhan,Lingshan Liu,Jin Zhang
Antibiotic contamination is increasing scrutinized recently. In this work, the Ag−AgCl/WO 3 /g-C 3 N 4 (AWC) nanocomposites were successfully synthesized using a two-step process involving electrostatic self-assembly and in-situ deposition for trimethoprim (TMP) degradation. The as-prepared photocatalysts were investigated and characterized by XRD, FTIR, XPS, TGA, SEM, TEM , UV–vis, PL and EIS. The experimental results indicated that 99.9% of TMP (4 mg/L) was degraded within 60 min when the concentration of AWC was 0.5 g/L. Reactive species scavenging experiments and electron spin resonance (ESR) experiments illustrated that superoxide radical (•O 2 − ) and photogenerated holes (h + ) were the main active species. The functional theory calculation and identification of intermediates via HPLC-MS revealed the possible degradation pathways of TMP. A double photoelectron-transfer mechanism in AWC photocatalyst was proposed. Five cycling photocatalytic tests and reactions under different solution matrix effects further supported that the AWC was a promising photocatalyst for the removal of TMP from the aquatic environment.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yun-Zhi Dai,Shu-Yu Liang,Chao Lv,Gong Wang,Hong Xia,Tong Zhang,Hong-Bo Sun
Micro/nanoscale gas sensors attracted more attention because of their potential application in the emerging areas such as electronic capsules, wearable devices, and microdrone detectors. However, it is still a challenge to achieve micro/nanoscale sensors with controllable processing parameters of active components and fast response and recovery capability. Here, a flexible and high precision femtosecond laser direct-writing technology is selected to print various semiconductor metal oxides nanoparticles into microscale designable patterns with mask-free. And by using Pd-doped WO 3 • x H 2 O nanoparticles we have fabricated single Pd-WO 3 • x H 2 O microwire (SPWM) as gas sensors, which represented high sensitivity, faster response and recovery. Especially, for ammonia gas sensing the SPWM with pre-designed lengths can possess ultrafast response with response/recovery time of 1.4/3.3 s in 50 ppm NH 3 , or low limit-of-detection of 1 ppm at room temperature. This kind of micro-scale gas sensor is expected to be applied to human health monitoring, environmental air detection and other integrated intelligent devices.
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