SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiangsen Xu,Fengye Lyu,Jiahao Chen,Yiqing Zeng,Zhaoxiang Zhong,Feng Zhang,Weihong Xing
In this work, TiO 2 nanocones grown on SiC membrane was used as the support of V 2 O 5 -WO 3 species to prepare V 2 O 5 -WO 3 /TiO 2 @SiC (VWTi(C-X)@SiC) catalytic membrane for dust filtration and NH 3 -SCR denitration. On account of the large specific surface area, abundant surface acid sites and prominent redox property, the optimized VWTi(C-550)@SiC catalytic membrane shows >90% NO removal efficiency at the temperature of 280–360 °C, which are much higher than VWTi(P-550)/SiC catalytic membrane (TiO 2 nanoparticles prepared by traditional vacuum coating titanium sol method was used as the support of V 2 O 5 -WO 3 species, NO conversion <80% at whole tested temperature). Additionally, VWTi(C-550)@SiC displays superior stability during the SO 2 + H 2 O resistance and 300 h long-term test at 300 °C, and exhibits an excellent dust filtration performance (2.5 μm SiO 2 particles interception rate exceeded 99.99%) under all test conditions. More importantly, the structure of nanocones decrease the influence of tensile stresses due to the different thermal expansion coefficients of TiO 2 and SiC membranes, which significantly suppress the fall of VWTi catalyst layer from the surface of SiC during pulse-jet cleaning. Among above results, it can be concluded that the optimized VWTi(C-550)@SiC catalytic membrane shows a prosperous application prospect for the simultaneously dust filtration and NH 3 -SCR denitration of medium–high temperature flue gas .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xingrui Tong,Jinhui Wang,Ping Zhang,Pengyang Lei,Yi Gao,Ruirui Ren,Siyu Zhang,Rui Zhu,Guofa Cai
Tungsten trioxide (WO 3 )-based electrochromic devices have attracted great interest in smart windows, low-power displays, and other cutting-edge fields. The electrochromic behavior of WO 3 is strongly dominated by both electron conduction and ion diffusion process. Nevertheless, the structure–activity relationship of the WO 3 in the electrochromism has not been well elucidated so far. Herein, we systematically studied the relationship between the crystal structure composed of the fundamental units of typical WO 3 and the electron conduction/ion diffusion processes at a sub-nanoscale level. Our theoretical results unveil that the h-WO 3 with appropriate band gap by piling up the WO 6 octahedral molecular units along c axis profit electron conduction, and the continuous three-, six-ring tunnels along ab plane built by the units are conducive to ion diffusion. Therefore, the h-WO 3 film exhibits large optical modulation (up to 86% at 633 nm and 90% at 1000 nm), excellent cycling stability (86.4% of retention over 3000 cycles), and fast switching speed (1.9 s of bleaching time at 633 nm). Moreover, we provide unique insights between H + adsorption/desorption and the electrochromic response in the near-infrared region. We believe that this study lays a foundation for the design and construction of high-performance electrochromic nanomaterials and broadband tunable smart windows.
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Chemosensors
·
2023
·Vol. 11
·期 4
·239
·
IF 4.2
Yanjia Ma,Ming Hou,Li Yang,Jiyun Gao,Guozhu Zhang,Ronghui Guo,Shenghui Guo
In this study, we report on the rapid preparation of WO3nanoplates decorated with noble metals and evaluate their gas-sensing performance using a high-throughput screening technique. The incorporation of Pd significantly enhanced the gas-sensing properties, and, among all of the samples tested, the WO3nanoplate containing 0.3 mol% Pd exhibited the highest response to 100 ppm xylene at 250 °C (Ra/Rg= 131.2), which was almost 56 times greater than that of the pure WO3sample. Additionally, this sample demonstrated rapid response and recovery times (τresponse= 3.9 s andτrecovery= 189.2 s, respectively). The nanoplate samples were also classified and screened using cluster analysis, and the selected samples were optimized for use in a sensor array. By applying principal component analysis and Fisher discriminant analysis, four typical gases were identified and a potential sensitization mechanism was elucidated.Keywords:high-throughput screening;volatile organic compounds;WO3;surface modification;array optimization
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JOURNAL OF NANOBIOTECHNOLOGY
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2019
·Vol. 17
·期 1
·1-14
·
IF 5.345
Gasmalla Hind Baballa,Lu Xiaoquan,Shinger Mahgoub Ibrahim,Ni Lubin,Chishti Aadil Nabi,Diao Guowang
Background Iron oxide nanocomposites have received a great attention for their application in various fields like physics, medicine, biology, and material science etc., due to their unique properties, such as magnetism, electrical properties, small size, biocompatibility and low toxicity. Methods Fe 3 O 4 /Ag 3 PO 4 @WO 3 nanocomposites with different weight percent of Ag 3 PO 4 were successfully prepared through fabricated Ag 3 PO 4 /Fe 3 O 4 with WO 3 via in situ fabrication method, electrospinning involved precursor solution preparation and spinning to enhance photocatalyst performance under simulated sunlight for the degradation of methylene blue (MB) and antibacterial activity against Staphylococcus aureus ( S. aureus ). Results The photocatalytic degradation of methylene blue (MB) under simulated light irradiation indicated that the nanocomposite with 0.25 mg of Ag 3 PO 4 has the best activity. An additional advantage of these photocatalysts is magnetic recoverability, using external magnetic field and photocatalytic stability of the nanocomposites was evaluated for three cycles. In addition, using different scavengers, holes (h + ) and superoxide radical (O
·−) 2
radicals and hydroxide radical ( · OH) were identified the main oxidative species in the degradation reaction of methylene blue. Conclusions The results reveal that Fe 3 O 4 /Ag 3 PO 4 @WO 3 -0.25 nanocomposites have photocatalytic and antibacterial activity against S. aureus. The photocatalyst and mechanism based on the enhancement of electron transfer processes between Ag 3 PO 4 and WO 3 nanoparticles.
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PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 5
·1621-1630
·
IF 2.531
Zhao Liu-Dan,Zhang Qian,Fan Jin-Bin,Yin Li-Qiang,Qi Peng-Wei,Yao Hong-Chang,Li Zhong-Jun
The search for efficient and powerful photoanode materials remains one of the toughest challenges in photoelectrochemical (PEC) water splitting because the oxygen evolution reaction on the photoanode is a rate-limiting process. On the other hand, the semiconductor/liquid interface is a key factor governing the water splitting efficiency due to its influence on charge separation and collection. Herein, we synthesized vertically aligned WO 3 nanosheet array (NS) films on fluorine-doped tin oxide (FTO), and followed by electroreduction for tuning the surface structure of WO 3 NSs. A disordered layer is formed on the surface of WO 3 NSs by controlling the external bias voltage and reduction time of electroreduction, and its thickness of the disordered layer varies with reduction time. The optimal WO 3 NSs with a 1.2 nm disorder layer thickness exhibit a remarkable photocurrent density of 1.07 mA cm −2 at 1.23 V vs reversible hydrogen electrode (RHE) under AM 1.5G illumination, which is 1.43 times of pristine WO 3 NSs. The results indicate that the electroreduction voltage and reduction time exert great influence on the formation of the surface disordered layer, and the optimized reduction conditions can enhance charge transfer and charge separation efficiency, substantially improving the PEC performance of WO 3 photoanode.
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高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 11
·909
·
IF 3.504
Zikai Jiang,Weigen Chen,Lingfeng Jin,Fang Cui,Zihao Song,Chengzhi Zhu
The development of functionalized metal oxide/reduced graphene oxide (rGO) hybrid nanocomposites concerning power equipment failure diagnosis is one of the most recent topics. In this work, WO3nanolamellae/reduced graphene oxide (rGO) nanocomposites with different contents of GO (0.5 wt %, 1 wt %, 2 wt %, 4 wt %) were synthesized via controlled hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses-derivative thermogravimetric analysis-differential scanning calorimetry (TG-DTG-DSC), BET, and photoluminescence (PL) spectroscopy were utilized to investigate morphological characterizations of prepared gas sensing materials and indicated that high quality WO3nanolamellae were widely distributed among graphene sheets. Experimental ceramic planar gas sensors composing of interdigitated alumina substrates, Au electrodes, and RuO2heating layer were coated with WO3nanolamellae/reduced graphene oxide (rGO) films by spin-coating technique and then tested for gas sensing towards multi-concentrations of acetylene (C2H2) gases in a carrier gas with operating temperature ranging from 50 °C to 400 °C. Among four contents of prepared samples, sensing materials with 1 wt % GO nanocomposite exhibited the best C2H2sensing performance with lower optimal working temperature (150 °C), higher sensor response (15.0 toward 50 ppm), faster response-recovery time (52 s and 27 s), lower detection limitation (1.3 ppm), long-term stability, and excellent repeatability. The gas sensing mechanism for enhanced sensing performance of nanocomposite is possibly attributed to the formation of p-n heterojunction and the active interaction between WO3nanolamellae and rGO sheets. Besides, the introduction of rGO nanosheets leads to the impurity of synthesized materials, which creates more defects and promotes larger specific area for gas adsorption, outstanding conductivity, and faster carrier transport. The superior gas sensing properties of WO3/rGO based gas sensor may contribute to the development of a high-performance ppm-level gas sensor for the online monitoring of dissolved C2H2gas in large-scale transformer oil.Keywords:WO3nanolamellae;reduced graphene oxide;acetylene sensing performance;gas sensing mechanism;dissolved gases in transformer oil
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Jingsong Han,Yue Li,Liming Yang,Tingting Li,Yan Luo,Lixia Yang,Shenglian Luo
The suitable doping or modification on TiO 2 holds promise for improving charge separation and extending light absorption range. Here, WO 3 modifying reduced band gap mesoporous TiO 2 (WO 3 /RM-TiO 2 ) due to WO 3 doping was successfully fabricated by immersing mesoporous TiO 2 nanoparticles in the peroxotungstic acid sol with controllable reaction time (0–1 h). The W 6+ ions were first incorporated into the TiO 2 lattice to form W O Ti bonds, resulting in the formation of WO 3 doping TiO 2 . Then, WO 3 nanoparticles gradually formed and attached on the TiO 2 surface, constructing a novel heterojunction catalyst with WO 3 serving as both dopant and light-sensitizer for TiO 2 . Photocatalytic activity of the resulting WO 3 /RM-TiO 2 depends on the immersing duration in the peroxotungstic acid. The BET analysis shows that 0.5 h-WO 3 /RM-TiO 2 has the largest pore volume of 0.491 cm 3 g −1 and the highest surface area of 82.3 m 2 g −1 , whereas these values decline with prolonged immersing duration. As expected, the optimal efficiency in removing p-nitrophenol (PNP) is achieved over 0.5 h-WO 3 /RM-TiO 2 under visible light irradiation, which is 2.33 times that of the unmodified M-TiO 2 . This should be attributed to the suitable WO 3 doping and WO 3 modification.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ge Ma,Junlin Lu,Qingguo Meng,Haiqin Lv,Lingling Shui,Yongguang Zhang,Mingliang Jin,Zhihong Chen,Mingzhe Yuan,Richard Nötzel,Xin Wang,Chuanyi Wang,Jun-Ming Liu,Guofu Zhou
In this work, a series of efficient visible-light-driven WO 3 /Cu (II) nanofiber photocatalysts, with superior photocatalytic activities for the degradation of dyes and aniline, were prepared by electrospinning and impregnation methods. The impregnation method brought about homogeneous distribution of Cu (II) species on the surface of WO 3 nanofibers. The prepared WO 3 /Cu (II) nanofiber photocatalysts exhibited enhanced visible-light absorption and reduced charge recombination, as compared to pure WO 3 nanofibers, due to the interfacial charge transfer (IFCT) effect between the Cu (II) species and WO 3 . The combined benefits of the grafting Cu (II) species on the surface of WO 3 , in terms of optical, surface, and texture properties, led to a significant improvement in the photocatalytic activity for the degradation of Rhodamine B (Rh B) and aniline under conditions of visible light irradiation. Upon the irradiation with visible light in the presence of WO 3 /Cu (II)-2% photocatalyst, the concentration of Rhodamine B (Rh B) decreased from 10 mg/L to 1.5 mg/L, and that of aniline solution decreased from 5 mg/L to 0.728 mg/L over a period of 3 h. And after running five cycles, the concentration of aniline solution could decrease from 5 mg/L to 0.89 mg/L by WO 3 /Cu (II)-2% photocatalyst.
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RARE METALS
·
2019
·Vol. 39
·期 7
·841-849
·
IF 1.785
Zhang Yi-Fei,Zhu Yu-Kun,Lv Chun-Xiao,Lai Shou-Juan,Xu Wen-Jia,Sun Jin,Sun Yuan-Yuan,Yang Dong-Jiang
A heterojunction photoanode of Fe 2 O 3 loaded on a WO 3 film on a fluorine-doped tin oxide substrate (FTO-WO 3 /Fe 2 O 3 ) was prepared via a simple hydrothermal and chemical vapor deposition (CVD) growth method. The photoanode showed higher photoelectrochemical (PEC) water-splitting activity than that of the pristine FTO-WO 3 under simulated sunlight because of the synergistic effect of Fe 2 O 3 and WO 3 . The as-synthesized material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The photocurrent density was estimated by linear sweep voltammetry and further confirmed using intensity-modulated photocurrent spectra. Experiments demonstrated that the coated Fe 2 O 3 enhanced the separation and migration efficiencies of the photoinduced electrons and holes, improving the PEC water-splitting properties. The FTO-WO 3 /Fe 2 O 3 photoanode showed a 1.25 times enhancement in photocurrent density compared with FTO-WO 3 . This result suggests that facile chemical vapor deposition growth is an effective way to fabricate heterojunctions and improve the properties of WO 3 photoanodes for PEC water-splitting applications.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wengao Zeng,Tao Cai,Yutang Liu,Longlu Wang,Wanyue Dong,Hui Chen,Xinnian Xia
Tungsten trioxide (WO 3 ) has a wide application in environmental remediation due to its stability. Yet, the application of WO 3 is severely limited by its wide band gap and weak electron reduction ability. In this work, we intend to enhance the visible light absorption and photocatalytic performance by constructing an organic-inorganic Z-scheme system WO 3 @Cu@PDI. Apparently, WO 3 @Cu@PDI has excellent visible light absorption and photocatalytic degradation ability in the degradation of tetracycline hydrochloride (TC). Under visible light irradiation, the degradation rate of composites is 40 times faster than that of sole WO 3 and 5 times than PDI. The photocatalytic activity of WO 3 @Cu@PDI toward TC still kept 85% after three reuses. We revealed that this high photoactivity arisen from the efficient carriers separation and the formation of Z-scheme junction. Importantly, this Z-scheme electron transfer pathway was confirmed by thorough experimental study. This work demonstrated the significant potential of WO 3 -based inorganic-organic Z-scheme photocatalyst in environmental remediation.
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FUEL
·
2024
·
IF 6.7
Yuzhou Xia,Jilong Xiao,Jiacheng Zhang,Renkun Huang,Xiaohui Huang,Guiyang Yan,Liuping Zheng
The construction of step-scheme (S-scheme) heterojunction has become an effective strategy for enhancing photocatalytic CO 2 reduction. In this study, a sunflower-like S-scheme WO 3 /ZnIn 2 S 4 heterostructure is fabricated through the in-situ growth of ZnIn 2 S 4 nanosheets on WO 3 hollow sphere, aimed at improving selective CO 2 reduction. The constructed embedding configuration, featuring a WO 3 hollow sphere core and an outer layer of ZnIn 2 S 4 nanosheet, increases the contact interface and establishes a significant built-in electric field, thereby promoting the migration and separation of photogenerated carriers. The confined internal cavity of the three-dimensional (3D) sunflower-like architecture aids in limiting the free diffusion of CO 2 , and enriching CO 2 molecules at the surface of the photocatalyst, consequently enhancing reaction kinetics. Moreover, S vacancies on ZnIn 2 S 4 nanosheets promote the chemisorption and activation of CO 2 . As a result, the optimized evolution rates for CH 4 and CO of 58.7μmol g –1 h −1 and 51.3μmol g –1 h −1 , respectively, are achieved for WO 3 /ZnIn 2 S 4 heterojunction. The corresponding electron selectivity for CH 4 reaches 82.1 %, which is 13 and 1.5 times higher than those of bare WO 3 and ZnIn 2 S 4 , respectively. This provides valuable insights into the design of muti-functionalized S-scheme heterojunction photocatalysts.
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RSC Advances
·
2017
·Vol. 7
·期 14
·8567-8574
·
IF 3.108
Jiachun Chai,Shanhui Zhu,Youliang Cen,Jing Guo,Jianguo Wang,Weibin Fan
One-pot hydrogenolysis of cellulose to ethylene glycol (EG) was carried out on WO3-based catalysts combined with Ru/C. To probe the active catalytic site for breaking the C–C bond of cellulose, a series of WO3–ZrO2 (WZr) catalysts were synthesized and systematically characterized with XRD, Raman, UV-Vis, H2-TPR, DRIFS and XPS techniques and N2 physisorption experiment. It was found that the WO3 crystallites became more easily reduced to W5+–OH species with increasing crystallite size or tungsten surface density of the WZr catalyst owing to the decrease of their absorption edge energy (AEE) originating from weakening their interaction with ZrO2 support. This, as a result, gave higher EG yield at higher tungsten surface density. The structure–activity relationship of the WZr catalyst reveals that the active catalytic site for cleaving the C2–C3 bond of the glucose molecule is the W5+–OH species.
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