JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Cui Lai,Fuhang Xu,Mingming Zhang,Bisheng Li,Shiyu Liu,Huan Yi,Ling Li,Lei Qin,Xigui Liu,Yukui Fu,Ning An,Hailan Yang,Xiuqin Huo,Xiaofeng Yang,Huchuan Yan
CeO 2 nanoparticles are successfully loaded on carbonate doped Bi 2 O 2 CO 3 (CBOC) nanosheets by a facile hydrothermal and low-temperature calcination method. CeO 2 /CBOC heterojunction shows significantly enhanced photocatalytic activity, when 35 mg of CeO 2 /CBOC photocatalyst is added to tetracycline (TC) solution (20 mg/L, 100 mL), about 79.5% TC is degraded within 90 min under visible light irradiation, which is much higher than that of original CeO 2 and CBOC. According to photoelectrochemical characterization and active radical capture experiments, the Z-scheme electron transfer mechanism is the reason for the significant enhancement of photocatalytic activity . Besides, the XPS results indicate that Ce 4+ /Ce 3+ redox pairs are formed at the contact interface between CeO 2 and CBOC, which is conducive to the transfer of photoexcited electrons and production of superoxide radicals. Additionally, the photocatalytic mechanism and possible degradation pathway of TC is proposed through free radical trapping experiments and liquid chromatography-mass (LC-MS) analysis. This study will accumulate experience for the combination of CeO 2 and bismuth-based nanomaterials , and provide a feasible way to design wide band-gap bismuth-based photocatalysts, thereby achieving efficient visible light degradation of environmental pollutants .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Dong Lin,Minghuan Gao,Lisha You,Yue Li,Zhiying Li,Linna Guo,Tiesheng Li,Minghua Liu
A series of novel Ag/AgVO 3 /WO 3 homojunction/heterojunction nanomaterials (denoted as AVW-x , x = 10, 20, 30, 40) were designed and synthesized by a simple coprecipitation method. Compared with the other materials, AVW-10 exhibited a unique photochemical performance with a wider absorption range, higher surface area and improved separation of charge carriers. The photocatalytic activity of AVW-10 for degrading RhB was investigated, and the apparent rate constant was 3.11 and 57.2 times higher than those of pure AgVO 3 and WO 3 . Interestingly, the photostability of the recycled catalyst could be significantly enhanced by adding a small amount of benzoquinone (BQ) due to the interaction between BQ and the catalyst, indicating that this addition might be an efficient way to enhance the photoactivity by promoting the separation of photoinduced carriers. Furthermore, trapping experiments were designed and systematically explored, and •O 2 − was identified as the main active species causing photocatalytic degradation of RhB. A new kind of type Ӏ plus Z-scheme mechanism was also proposed.
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Nanomaterials
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2020
·Vol. 10
·期 4
·600
·
IF 4.324
Wan Zhao,Xiuru Yang,Chunxi Liu,Xiaoxiao Qian,Yanru Wen,Qian Yang,Tao Sun,Wenya Chang,Xin Liu,Zhi Chen
The increasing discharge of dyes and antibiotic pollutants in water has brought serious environmental problems. However, it is difficult to remove such pollutants effectively by traditional sewage treatment technologies. Semiconductor photocatalysis is a new environment-friendly technique and is widely used in aqueous pollution control. TiO2is one of the most investigated photocatalysts; however, it still faces the main drawbacks of a poor visible-light response and a low charge-separation efficiency. Moreover, powder photocatalyst is difficult to be recovered, which is another obstacle limiting the practical application. In this article, g-C3N4/TiO2heterojunction is simply immobilized on a glass substrate to form an all-solid-state Z-scheme heterojunction. The obtained thin-film photocatalyst was characterized and applied in the visible-light photodegradation of colored rhodamine B and tetracycline hydrochloride. The photocatalytic performance is related to the deposited layers, and the sample with five layers shows the best photocatalytic efficiency. The thin-film photocatalyst is easy to be recovered with stability. The active component responsible for the photodegradation is identified and a Z-scheme mechanism is proposed.Keywords:thin-film photocatalyst;environmental control;antibiotic residue removal;g-C3N4/TiO2;all-solid-state Z-scheme heterojunction
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Jianhua Zheng,Xueyan Liu,Lei Zhang
Hollow double-shell Cu 2 O@CuCo 2 O 4 (HDS-Cu 2 O@CuCo 2 O 4 ) Z-Scheme photocatalyst with a porous structure was designed and successfully synthesized by anchoring Cu 2 O nanoparticles (NPs) on the surface of CuCo 2 O 4 hollow spheres in situ. HDS-Cu 2 O@CuCo 2 O 4 exhibited remarkable photocatalytic activity towards chlorotetracycline (CTC) oxidation and nitrobenzene (NB) reduction under visible light irradiation. Total organic carbon (TOC) removal of 63% was achieved over HDS-Cu 2 O@CuCo 2 O 4 for CTC degradation, which is 1.7 and 2.1 times higher than that of pristine Cu 2 O and CuCo 2 O 4 . Moreover, the photocatalytic activity for both oxidation and reduction were simultaneously improved in CTC + NB mixed system owing to the presence of the synergistic photocatalytic effect. The superior photocatalytic performance of HDS-Cu 2 O@CuCo 2 O 4 hybrid system should be mainly attributed to the unique hollow structure as well as the Z-scheme charge transfer pathway, which not only improve the utilization of visible light but also enhance the separation efficiency of photoexcited charge carriers. The proposed strategy provides an insight into the application of hollow Z-Scheme photocatalyst in environmental remediation.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Lixiang Zhang,Pan Li,Luping Feng,Xi Chen,Jiatian Jiang,Sheng Zhang,Anchao Zhang,Guofu Chen,Hua Wang
Visible-light-driven and ultra-stable CoS x /CdS photocatalysts were controllably fabricated by the ZIF-67-templated one-pot solvothermal route for highly efficient photocatalytic Cr(VI) reduction. It was discovered that the resulting CoS x /CdS composites could present different photocatalytic activities controllably depending on the CoS x -to-CdS molar ratios used. The one with 1/16 M ratio could display the highest photocatalytic reduction performance for Cr(VI) with the efficiency up to 100% within 30 min, which is 5.6-fold and 2.1-fold higher than that of pristine CoS x and CdS, respectively. Herein, the components of CoS x and CdS with well-matched energy-band structures might serve separately as the electrons donor and the holes quencher to prolong the lifetime of photogenerated electrons in CoS x /CdS composites. A direct Z-scheme heterojunction could be thus constructed for promoting the charge carrier transferring with the improved redox abilities, leading to the robust photocatalysis of CoS x /CdS photocatalyst. Moreover, the developed CoS x /CdS photocatalyst could present superior stability with the structure and activity well survived after five photocatalytic cycles. This work may pave the way towards the controllable construction of a direct Z-scheme photocatalytic system by synergistically combining two kinds of components with matched energy-band structures, achieving the enhanced photocatalysis for the wide applications in the environmental remediation field.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Shaoxiu Li,Chan Lai,Changhui Li,Jintang Zhong,Zhifeng He,Qiuyi Peng,Xi Liu,Bohan Ke
A new magnetic dual Z-scheme heterostructure photocatalyst, consisting of mesoporous graphitic carbon nitride (mpg-C 3 N 4 ), BiOBr, polythiophene (PTh), and magnetic iron oxide, was developed, and its structural, optical, and electrochemical properties were analyzed. The photocatalyst was employed for the degradation of dimethyl phthalate (DMP) in water under visible light to evaluate its photocatalytic activity. The results revealed that the photocatalytic activity of the new heterostructure photocatalyst was superior to that of its single-component counterparts. The reaction kinetics of photocatalytic DMP degradation followed pseudo first-order kinetics and the reaction rate constant was 3.7- and 4.5-fold higher than those of pristine g-C 3 N 4 and BiOBr, respectively. The enhanced photocatalytic performance was chiefly attributed to the dual Z-scheme heterostructure generated between mpg-C 3 N 4 , PTh, and BiOBr, which effectively hindered the recombination of photogenerated electron and hole pairs in mpg-C 3 N 4 and BiOBr, improving the photogenerated carrier transfer efficiency. Radical trapping test results indicated that the active species, h + , ·O 2 – , and ·OH, coexisted during the photocatalytic reaction process, and that h + played a major role in the destruction of DMP molecules. DMP was degraded into intermediate small-molecule products, such as acids and alcohols, which were ultimately mineralized to CO 2 and H 2 O. The magnetic property of the new heterostructure photocatalyst enabled its straightforward separation from water using magnetic separation technology for further reuse. This study provides a new material and method for the effective removal of DMP from aqueous solution.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Jiangli Sun,Yanping Hou,Zebin Yu,Lingli Tu,Yimin Yan,Shanming Qin,Shuo Chen,Danquan Lan,Hongxiang Zhu,Shuangfei Wang
It is urgently needed to develop high-performance materials that can synchronously remove heavy metals and organic pollutants . Herein, the visible-light responsive Zn 3 In 2 S 6 /AgBr composites were prepared for concurrent removals of metronidazole (MNZ) and Cr (VI). In the Cr (VI)-MNZ coexisting system, the removals of MNZ and Cr (VI) using the optimized Zn 3 In 2 S 6 /AgBr-15 photocatalyst reached 98.2% and 94.8% within 2 h, respectively; higher than those using counterparts. The radical species trapping and electron spin resonance (ESR) results demonstrated that ·OH was the most dominated species for MNZ oxidation , and photo-generated electrons were responsible for Cr (VI) reduction. Besides, slight competition for ·O 2 ˉ during the simultaneous MNZ degradation and Cr (VI) reduction occurred. Energy band structure analysis, ESR and the outstanding photocatalytic performance for MNZ and Cr (VI) removals demonstrated that the Zn 3 In 2 S 6 /AgBr-15 was a Z-scheme photocatalyst, which promoted photo-induced carrier′s separation. Possible MNZ degradation pathways and mechanism over the Z-scheme Zn 3 In 2 S 6 /AgBr were also proposed based on the identified intermediates. This study could inspire new ideas for design of efficient Z-scheme photocatalysts for wastewater treatment .
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Tongtong Zhang,Yuqi Wang,Xin Xie,Yanning Shao,Yuhao Zeng,Siyu Zhang,Qishe Yan,Zhongjun Li
A dual Z-scheme carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 photocatalyst were synthesized by simple solvothermal and calcination methods. The physical and chemical properties of prepared samples were explored via a series of characterization and Density Functional Theory (DFT) calculations. The formation mechanism of the composite photocatalyst was systematically studied and the formation process was simulated. Under the irradiation of visible light, 10% carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 exhibited the best photocatalytic performance. And the kinetics reaction model was followed pseudo-first-order kinetics. Moreover, the possible TC degradation pathways were established based on LC-MS. The enhanced photocatalytic activity was mainly attributed to the dual Z-scheme heterojunction formed by carbon-bridged g-C 3 N 4 deposition on the surface of Bi 2 O 3 and BiOI and a higher charge transfer rate of carbon-bridged g-C 3 N 4 , which effectively promoted the separation and transfer of electron-hole pairs. The trapping experiments were carried out to further explore its photocatalytic mechanism. This work provided an in-depth understanding of g-C 3 N 4 and bismuth-based catalysts.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Enhui Jiang,Ning Song,Xiaoxu Zhang,Lili Yang,Chunbo Liu,Hongjun Dong
It is highly desirable to develop an in-situ fabrication route by facile pH control strategy to prepare Z-scheme heterostructure photocatalyst for producing more firm and intimate interfacial interaction, which will be in favor of removing pollutants in water under the visible light. Herein, the new highly-efficient visible-light-driven Z-scheme Bi 3 O 4 Cl/Bi 12 O 17 Cl 2 heterostructure is prepared by in-situ growth method and this research explores a novel pathway to interconvert Bi 12 O 17 Cl 2 and Bi 3 O 4 Cl by facile pH control strategy. The Z-scheme Bi 3 O 4 Cl/Bi 12 O 17 Cl 2 heterostructure exhibits splendid universal photocatalytic degradation activities to degrade various pollutants under visible light irradiation. The Z-scheme heterostructure and the strong interfacial coupling effect produced by in-situ growth of Bi 3 O 4 Cl on the surface of Bi 12 O 17 Cl 2 are the main reasons to enhance photocatalytic performance. Furthermore, the possible photocatalytic reaction mechanisms including migration and transport behaviors of charge carriers, generation process of reactive species and degradation intermediate products of 2, 4-dichlorophenol are revealed in depth. This proposes a novel design concept to prepare highly-efficient, stable and visible-light-driven Z-scheme photocatalyst, which is expected to be widely applied for the universal removal of multiple pollutants in wastewater efficiently.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
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2020
·Vol. 43
·期 5
·831-838
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IF 2.419
Liu Bin,Wang Xufeng,Zhao Jiahao,Qin Liehao,Shi Lei,Zhou Tao,Liu Shuang,Wang Chunling
Zygosaccharomyces rouxii referred as Yeast S is an important microorganism widely applied in traditional fermented food to accelerate flavor formation. Z. rouxii 3-2 referred as Yeast S 3-2 constructed previously is a new strain having higher salt tolerance than wild type. In this study, salt stress response of synthesis key flavor metabolites 3-methylthiopropanol, 2-phenylethyl alcohol, and isoamyl acetate in Yeast S and S 3-2 were investigated based on SPME–GC–MS and RT-qPCR. Analysis of GC–MS data showed that high salinity led to increase the contents of 3-methylthiopropanol and 2-phenylethyl alcohol both in Yeast S and Yeast S 3-2, while inhibited the synthesis of isoamyl acetate, and the induced effect on Yeast S 3-2 was more pronounced than Yeast S. Furthermore, the RT-qPCR results revealed that the salinity could enhance the genes expression of ARO10 and PDC1 , and stronger effect on Yeast S 3-2 than S. However, the gene expression of AFT1 was reduced in high-salt culture conditions, which was consistent with the results of GC–MS data. The results presented in this study can provide theoretical support of Z. rouxii 3-2 application during food fermentation.
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Journal of the Taiwan Institute of Chemical Engineers
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2019
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IF 3.834
Kané Rabé,Lifen Liu,Noor Ahmed Nahyoon,Yizhen Zhang,Ahmed Mahmoud Idris,Jiaqi Sun,Lixin Yuan
We have prepared and studied a novel low cost catalyst of g-C 3 N 4 /Fe 0 (1%)/TiO 2, using a simple process involving the formation of zero valence iron by chemical reduction . This ternary catalyst g-C 3 N 4 /Fe 0 (1%)/TiO 2 was characterized using XRD (X-Ray diffraction), UV–vis spectrum, EDS (Energy Dispersive spectrum) and TEM (transmission electron microscopy), it demonstrated high-visible-light activity in a wide range of pH condition, it can photo-catalytically degraded Rhodamine B (RhB), Tetracycline (TC), and Berberine hydrogen chloride (BH) (∼98% in 90 min) under visible light. The high activity arises from the increased harvest of more visible light and the improved separation of photo-excited electrons and holes via Z-scheme and heterojunctions mechanism. Also, the time required to remove 100% RhB, TC, and 96% BH can be shortened from 90 min to 60 min by introducing 3.18 mM Na 2 SO 3 to this photocatalysis system that assisted the generation of reactive oxidizing species and pollutant degradation. The results showed promising application prospect for this developed catalyst and the tested photocatalysis pollutant degradation system.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Yingying Jiao,Qunzeng Huang,Jianshe Wang,Zhanhang He,Zhongjun Li
A novel MoS 2 quantum dots (QDs) decorated g-C 3 N 4 nanosheet/N-doped carbon dots (NCDS) heterojunction photocatalyst was successfully synthesized by thermal polymerization and subsequent solvothermal approach. Under visible light (λ ≥ 420 nm) irradiation, the as-prepared g-C 3 N 4 /NCDS/MoS 2 composite with 3wt% of MoS 2 and 2wt% of NCDS displayed the highest photocatalytic hydrogen evolution activity with a corresponding H 2 evolution rate of 212.41μmol g −1 h −1 , which was about 53 times higher than that of g-C 3 N 4 /MoS 2 -3%. Moreover, the g-C 3 N 4 /NCDS/MoS 2 composite exhibited excellent photostability. The enhanced photocatalytic activity of g-C 3 N 4 /NCDS/MoS 2 composite was predominantly attributed to the formation of Z-scheme heterojunction between g-C 3 N 4 and NCDS, which effectively accelerated the transfer and separation of photogenerated charge carriers. Besides, the introduction of noble metal-free MoS 2 co-catalyst further promoted the separation of photogenerated charge carriers and provided more active sites for H 2 evolution reaction. The advantages of superior photocatalytic activity and excellent stability endowed a promising potential for g-C 3 N 4 /NCDS/MoS 2 composite to apply in photocatalytic fields.
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