DALTON TRANSACTIONS
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2022
·Vol. 52
·期 2
·476-486
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IF 4.569
Junlei Wang,Kuan Wang,Zhen-Hong He,Tong Sun,Run-Jing You,Jian-Gang Chen,Weitao Wang,Yang Yang,Zhao-Tie Liu
Oxygen-containing organics, which are generated from the selective oxidation of their corresponding hydrocarbons, have high value in the chemical and pharmaceutical industries. However, their oxidation reactions are very challenging as the products are more active than the substrates, especially for the oxidation of cyclohexane (CHA). Herein, we focused on the one-step preparation of Bi2WO6 with double active sites of tunable metallic Bi and oxygen vacancies (OV–Bi/Bi2WO6) by a facile solvothermal treatment. Then, OV–Bi/Bi2WO6 was used as an efficient photocatalyst for the partial oxidation of CHA to cyclohexanone (CHA-one) for the first time in air as an oxidant under solvent-free and room temperature conditions. The Bi : Bi2WO6 ratio in the as-prepared OV–Bi/Bi2WO6 heterojunction could be tailored from 0.08 to 8.43 by controlling the solvothermal temperature, and the synergistic effect between DMF and EG could increase the reduction of MDF/EG and promote the production of Bi. Moreover, OV–Bi/Bi2WO6-160 yielded 4.4 and 8.8 times more CHA-one (128.8 μmol) than pure Bi2WO6 and metallic Bi, respectively, and achieved 93.6% selectivity to CHA-one in air as an oxidant under solvent-free conditions. The results revealed that the highly enhanced photocatalytic activity was mainly attributed to the superior specific surface area, outstanding photo-absorption, abundant oxygen vacancies, and efficient electron–hole separation. Moreover, for the unique double active sites in OV–Bi/Bi2WO6, oxygen vacancies can enhance the adsorption and activation capacity of Bi2WO6 for O2, while metallic Bi can improve the adsorption and activation capacity of Bi2WO6 for CHA. Meanwhile, OV–Bi/Bi2WO6 also exhibited excellent durability due to the strong interaction between metallic Bi and Bi2WO6. The present work provides a flexible approach for tailoring the Bi : Bi2WO6 ratio and outlines an effective method for producing CHA-one from CHA under mild conditions.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Xiaoxue Yang,Xiaoqing Liu,Dan He,Yifu Hu,Xiaojing Wang
Tetracyclines (TCs) are one of the most common types of antibiotics. In this investigation, a 2D–2D BiO 2−x /Bi 2 WO 6 composite has been assembled via growing Bi 2 WO 6 in situ on the sheets of BiO 2−x by a simple hydrothermal process and has been applied to removal residual TCs in waterbody. The XRD , SEM, TEM , and XPS analyses reveal that BiO 2−x /Bi 2 WO 6 composite is a compact 2D–2D heterojunction and exhibit rich oxygen vacancy . Among the series of composites with the different ratios, 20BiO 2−x /Bi 2 WO 6 displays a more excellent visible-light photocatalytic performance with a 96.4% degradation rate of TC, compared to pure Bi 2 WO 6 (47.9%) and BiO 2−x (73.3%). The enhanced photodegraded mechanism is revealed in view of the XPS analysis, ESR spectra and density function theory (DFT) calculation. The excellent photocatalytic performance is attributed to the BiO 2−x /Bi 2 WO 6 heterojunction and the generation of more oxygen vacancies originated from the co-shared Bi species and redox couple Bi 5+ /Bi 3+ pairs in composite, which will increase the light trapping ability, accelerate the electron transfer , induce a strong redox, and lead to the excellent photo-degraded activity for aqueous TC. This research provides a new insight into the development of the novel bismuth base photocatalyst via growing in situ strategy in the application to photo-catalytically decompose aqueous antibiotic residues.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yashi Qing,Yanxiang Li,Zhiwei Guo,Yujie Yang,Wangliang Li
17β-estradiol (E2) is one of the endocrine disrupting chemicals (EDCs) ubiquitously with significant impacts on ecosystem and organisms even at extremely low concentrations. Photocatalytic membranes, with the combination of photocatalysis and membrane filtration, have great potential to enhance E2 removal. In this work, a photocatalytic membrane was fabricated from the polyamide (PA) microfiltration membrane and visible light responsive Bi 2 WO 6 /protonated g-C 3 N 4 (BPG) photocatalyst. The BPG photocatalyst was embedded into calcium alginate hydrogel followed by immobilizing onto PA membrane through vacuum filtration and crosslinking. The transparent calcium alginate hydrogel guaranteed 100% light transmittance which contributed to visible light induced photodegradation . Under static and dynamic conditions, the removal efficiency of E2 reached 99.5% and remained 95.1%, which was mainly owing to the synergistic effects of the adsorption of PA and photodegradation of the BPG nanocomposites . The synergistic interaction was fitted by modified Elovich model, and a strong positive correlation (r = 0.834, r s = 0.965) was confirmed by Pearson’s and Spearman’s correlation coefficient , indicating that adsorption could enhance photocatalysis by concentrating contaminants around the photocatalyst and photocatalysis could promote the adsorption by regenerating adsorption sites. The photocatalytic membrane can be reused, and the removal efficiency of E2 was 96.6% after 5 cycles. This work provided not only a facile fabrication of photocatalytic membrane, but also a deep understanding of the synergistic adsorption-photocatalysis for effective removal of E2.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Huiqin Chang,Meng Jiang,Qiying Zhu,Anqi Liu,Yuyin Wu,Canguo Li,Xiangyue Ji,Li Gong,Shanshan Li,Zhiwei Chen,Ling Kong,Lei Han
Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-COV-2) is a cluster of β coronaviruses. The 2019 coronavirus disease (COVID-19) caused by SARS-COV-2 is emerging as a global pandemic. Thus, early diagnosis of SARS-COV-2 is essential to prevent severe outbreaks of the disease. In this experiment, a novel label-free photoelectrochemical (PEC) immunosensor was obtained based on silver sulfide (Ag 2 S) sensitized titanium dioxide@bismuth tungstate (TiO 2 @Bi 2 WO 6 ) nanocomposite for quantitative detection of SARS-COV-2 nucleocapsid protein. The constructed TiO 2 @Bi 2 WO 6 hollow microspheres had large specific surface area and could produce high photocurrent intensity under visible light illumination. Ag 2 S was in-situ grown on the surface of thioglycolic acid (TGA) modified TiO 2 @Bi 2 WO 6 . In particular, TiO 2 @Bi 2 WO 6 and Ag 2 S formed a good energy level match, which could effectively enhance the photocurrent conversion efficiency and strength the photocurrent response. Ascorbic acid (AA) acted as an effective electron donor to effectively eliminate photogenerated holes. Under optimal experimental conditions, the constructed immunosensor presented a supersensitive response to SARS-COV-2 nucleocapsid protein, with a desirable linear relationship ranged from 0.001 to 50 ng/mL for nucleocapsid protein and a lower detection limit of 0.38 pg/mL. The fabricated sensor exhibited a wide linear range, excellent selectivity, specificity and stability, which provided a valuable referential idea for the detection of SARS-COV-2.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13305-13322
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IF 2.478
Gu Yufen,Guo Bobo
Here, the novel Ag 2 MoO 4 /Bi 2 WO 6 (AMO/BWO) heterojunction composite photocatalysts were synthesized based on the combination (co-precipitation method + hydrothermal method) XRD, XPS, SEM, TEM, UV–Vis DR spectroscopy, PL spectroscopy, FTIR spectroscopy, as well as EIS analyses were employed to characterize the photocatalysts, and photocurrent response was utilized to confirme the formation of Z-type heterojunction. The generation and transfer of electron/holes in the AMO/BWO heterojunctions excited by simulated sunlight were analyzed. Under simulated sunlight, the photocatalytic performance of AMO/BWO composites were studied by degradation of organic pollutants. The experimental results show that the 30 wt% AMO@BWO is the best photocatalytic composite material among all samples and the degradation rate reached 98.6%. Due to the prolonging of lifetime of the photoexcited electrons in the CB of AMO and holes in the VB of BWO, these carriers are more effective to participate in photodegradation reactions. An electron/hole transfer mechanism of the Z-scheme heterojunctions is proposed to illustrate the enhanced photodegradation performance of the AMO/BWO composite samples.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Chunfang Wang,Yun Tang,Bihong Zhang,Ziying Zhong,Faqiong Zhao,Baizhao Zeng
In this study, PO 4 3− doped Bi 2 WO 6 (BWO-PO) was prepared by hydrothermal method , and then copolymer of thiophene and thiophene-3-acetic acid (P(Th-T3A)) was chemically deposited on the BWO-PO surface. The introduction of PO 4 3− created point defects , greatly improving the photoelectric catalytic performance of Bi 2 WO 6 ; the copolymer semiconductor could form heterojunction with Bi 2 WO 6 to promote the separation of photo-generated carriers, due to its proper band gap. Furthermore, the copolymer could enhance the light absorption ability and photo-electronic conversion efficiency. Hence, the composite had good photoelectrochemical properties. When it was combined with carcinoembryonic antibody through the interaction of –COOH groups of the copolymer and the end groups of antibody for constructing ITO-based PEC immunosensor, the resulting sensor exhibited superb response to carcinoembryonic antigen (CEA), with a wide linear range of 1 pg/mL−20 ng/mL, and a relatively low detection limit of 0.41 pg/mL. It also showed high anti-interference ability, stability, and simplicity. The sensor has been successfully applied to monitor the concentration of CEA in serum. The sensing strategy can also be applied to the detection of other markers by changing the recognition elements, hence it has good application potential.
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Materials
·
2019
·Vol. 12
·期 10
·1713
·
IF 2.972
Dongxiang Luo,Qizan Chen,Ying Qiu,Baiquan Liu,Menglong Zhang
This work focuses on the crystal size dependence of photoactive materials and light absorption enhancement of the addition of carbon dots (CDs). mac-FTO (macroporous fluorine-doped tin oxide) films with an inverse opal structure are exploited to supply enhanced load sites and to induce morphology control for the embedded photoactive materials. The Bi2WO6@mac-FTO photoelectrode is prepared directly inside a mac-FTO film using a simple in situ synthesis method, and the application of CDs to the Bi2WO6@mac-FTO is achieved through an impregnation assembly for the manipulation of light absorption. The surface morphology, chemical composition, light absorption characteristics and photocurrent density of the photoelectrode are analyzed in detail by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (DRS), Energy dispersive X-ray analysis (EDX) and linear sweep voltammetry (LSV).Keywords:photoelectrode;carbon dots;macroporous electrode
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Runren Jiang,Guanghua Lu,Zhenhua Yan,Donghai Wu,Jianchao Liu,Xiadong Zhang
2D/2D materials have attracted extensive attention in the field of photocatalysis due to their large contact surfaces and short charge transfer distances. However, 2D/2D heterojunction materials, especially those that connect different materials together using strong chemical bonds, are still challenging to prepare. Herein, a novel hydrogen bond-assisted 2D/2D Z-scheme SnNb 2 O 6 /Bi 2 WO 6 system was successfully prepared using a facile hydrothermal method . The 2D/2D Z-scheme system increases the accessible area for charges and constructs interfacial electric fields, thereby reducing the barriers for electron transport and enhancing the photocatalytic activity . In addition, the electronic coupling of the surface hydrogen bonds can further enhance the interfacial electric fields, which offers a new route for lowering the interfacial potential barrier of the system. As expected, the hydrogen bond-assisted 2D/2D Z-scheme SnNb 2 O 6 /Bi 2 WO 6 system results in an outstanding improvement of the norfloxacin (NOR) photodegradation efficiency, and the degradation rate constant (4.06 × 10 −2 min −1 ) is 9 and 2 times higher than those of SnNb 2 O 6 (4.33 × 10 −3 min −1 ), and Bi 2 WO 6 (1.70 × 10 −2 min −1 ), respectively. Simultaneously, three differently degradation pathways for the degradation of NOR were proposed based on the degradation products that were identified. Finally, a fast charge transfer mechanism of the hydrogen bonds that are connected to the 2D/2D Z-scheme SnNb 2 O 6 /Bi 2 WO 6 system is proposed, which is based on the ESR analysis and the DFT calculations.
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APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Fengjiao Wang,Yuyao Gu,Zhenya Yang,Yanyu Xie,Jiangjie Zhang,Xiaotong Shang,Huibo Zhao,Zizhong Zhang,Xuxu Wang
We developed a simple X − -assisted (X = Cl, Br, I) one-pot hydrothermal reaction to successfully synthesize a series of BiOX/Bi 2 WO 6 heterojunction. The effect of different halogens and their addition amount on the photocatalytic performance of BiOX/Bi 2 WO 6 composites was investigated using benzyl alcohol selective oxidation under visible-light irradiation. All BiOX could enhance the photocatalytic activity of Bi 2 WO 6 , but the BiOBr was the optimum for the maximum improvement of Bi 2 WO 6 . The match of energy band structure between BiOX and Bi 2 WO 6 resulted in the highly efficient separation of photogenerated charges, which was mainly attributed to their fundamental distinction of the photocatalytic activity. This work clarified the essential distinction in photocatalytic performance of the different halogen of BiOX/Bi 2 WO 6 heterojunction, and also provided guidance for the construction of efficient heterojunction photocatalysts.
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NANO
·
2017
·
IF 1.025
Yunyun Wang,Jixiang Wang,Hongqiang Shen,Pengwei Huo,Chunmei Li,Yongsheng Yan,Weidong Shi
The photocatalytic technology as a kind of green and potential technology has been paid more and more attention in ever-increasing environmental pollution and energy shortage. In this study, a practical strategy is proposed to facilitate effectively the separation of photogenerated electrons and holes by addition of graphene oxide in Ag 3 PO 4 and Bi 2 WO 6 nanocrystals semiconductor composites. Compared with GO-single component, the three-component RGO-Ag 3 PO 4 /Bi 2 WO 6 composites exhibited improved photocatalytic activity with a degradation rate that reached up to 91% for tetracycline (TC) by visible light irradiation. Graphene oxide served as an electronic conduction medium to effectively transfer the photogenerated electrons from the conduction band of Bi 2 WO 6 to the valence band of Ag 3 PO 4 ; the all-solid-state Z-Scheme photocatalytic mechanism was proposed. Our work provides an effective method for development of pragmatic photocatalysts in the present environmental pollution, energy problems and other related fields.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yue Meng,Zhiling Huang,Di Liu,Bo Xie,Ying Guo,Shengjie Xia
In this paper, based on oxygen rich vacancies Bi 2 WO 6 -Ov@CoFe-LDHs heterojunction (BWO-Ov@LDHs), which can efficiently activate PS under visible light, BWO-Ov@LDHs/PS material system was fabricated for efficient degradation of tetracycline (TC). After 30 minutes photodegradation, the removal of TC by BWO-Ov@LDHs/PS reached 93.4 %, which is 2.9–3.1 times than that of pure PS and BWO-Ov@LDHs. Based on band structure, XPS result and theoretical calculations such as work function and differential charge density, it indicates that the Z-scheme heterojunction accelerates the transfer and conversion of electrons, and the activation of persulfate ions generates sulfate radicals, enhancing the photocatalytic performance, the variable valence state further strengthens the generation of sulfate radicals, and the tripartite synergy promotes the efficient photocatalytic degradation of TC. The results based on LC-MS provided the intermediate products and pathways of the degradation process, while toxicity analysis showed that the toxicity of intermediate products was lower.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Luping Feng,Enjun Chen,Xinfeng Li,Jianghong Wang,Yujie Fan,Leyao Jin,Peisong Tang,Lixiang Zhang
A bifunctional 0D-2D nanostructured S-scheme CdS-Bi 2 WO 6 heterojunction for highly efficient photoelectrochemical (PEC) detection coupled with the degradation of chlorpyrifos (CP) was prepared by hydrothermal growth of CdS quantum dots onto Bi 2 WO 6 nanosheets. It was uncovered that the so-obtained heterojunction composites notably minimized the recombination of photoinduced electron-hole pairs and exhibited much improved PEC responses compared to pristine Bi 2 WO 6 because of the in-situ formed internal electrostatic field between CdS and Bi 2 WO 6 components induced by the S-scheme heterostructure. After the addition of CP, the interactions between Bi sites and the P=S/C=N groups of CP specifically inhibited the photocurrent signals of obtained CdS-Bi 2 WO 6 sample, impeding the separation and transfer of photoinduced carriers. Significantly, it was found that the photo-generated holes in Bi 2 WO 6 and • OH radicals produced within the PEC system could effectively interact with CP molecule, enabling simultaneous catalytic degradation during detection process and the possible intermediates and degradation pathways of CP were explored and speculated. As a result, a bifunctional PEC platform was introduced for the sensitive and efficient detection and degradation of CP. This platform holds potential to offer theoretical support for the monitoring and remediation of other organophosphate pesticides like CP.
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