CATALYSIS LETTERS
·
2022
·Vol. 152
·期 12
·3594-3606
·
IF 2.936
Yao Haoyang,Xu Yunlan,Zhong Dengjie,Zeng Yundong,Zhong Nianbing
In order to inhibit rapid recombination of electron–hole pairs of photoanode and expand its light response wavelength, PPy-14%/WO 3 /TiO 2 /Ti photoanode was prepared. The maximum photocurrent density is 2.31 mA·cm −2 , which is 1.76 times higher than that of WO 3 /TiO 2 /Ti at 1.1 V (vs. SCE). The maximum power density, phontocurrent density and Rhodamine B degradation rate of photocatalytic fuel cell (PFC) with PPy-14%/WO 3 /TiO 2 /Ti photoanode and Cu cathode are 25.48 μW·cm −2 , 0.25 mA·cm −2 and 88.5%, respectively. The excellent performance is mainly due to the good carrier migration rate of PPy and the synergistic effect of PPy/WO 3 /TiO 2 /Ti ternary hybrid electrode, so that photogenerated electrons and holes can accumulate in the conduction band of WO 3 and HOMO of PPy, respectively. This not only expands the light absorption range and enhances the light absorption intensity, but also improves the separation of electron–hole pairs, and finally significantly enhances the Rhodamine B degradation and electricity generation performance of PFC. Graphical Abstract In order to inhibit rapid recombination of electron–hole pairs of photoanode and expand its light response wavelength, PPy-14%/WO 3 /TiO 2 /Ti photoanode was prepared. The excellent performance is mainly due to the good carrier migration rate of PPy and the synergistic effect of PPy/WO 3 /TiO 2 /Ti ternary hybrid electrode, so that photogenerated electrons and holes can accumulate in the conduction band of WO 3 and HOMO of PPy, respectively.
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RSC Advances
·
2018
·Vol. 8
·期 22
·12459-12470
·
IF 2.936
Minghua Wang,Longyu Yang,Jinyun Yuan,Linghao He,Yingpan Song,Hongzhong Zhang,Zhihong Zhang,Shaoming Fang
A series of bismuth sulfide (Bi2S3) nanorods and amine-functionalized Ti-based metal–organic framework heterojunctions [denoted by Bi2S3@NH2-MIL-125(Ti)] were constructed and explored as bifunctional photocatalysts for Cr(VI) reduction and rhodamine B (RhB) degradation under visible light illumination. Compared with the individual NH2-MIL-125(Ti) and Bi2S3, the as-synthesized Bi2S3@NH2-MIL-125(Ti) photocatalyst exhibited an enhanced photocatalytic activity toward Cr(VI) and RhB owning to the synergetic effect between Bi2S3 and NH2-MIL-125(Ti). Moreover, the Bi2S3@NH2-MIL-125(Ti) heterojunctions showed increased Cr(VI) removal efficiency by adding RhB in the system. The photocatalytic mechanism was proposed based on the analysis of different scavenger for active species and electron spin resonance spectrometry. The introduction of Bi2S3 into NH2-MIL-125(Ti) can extend the light adsorption and improve the transfer and separation of photogenerated charge carriers through the Bi2S3@NH2-MIL-125(Ti) heterojunction with unique band gap structure. The synthesized Bi2S3@NH2-MIL-125(Ti) photocatalyst also exhibited good reusability and stability.
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Journal of Water Process Engineering
·
2023
·
IF 7
Zihao Wang,Lijiao Yang,Zezhong Shan,Lu Tang,Cheng Chen,Yeqing Lan,Wei Li
In this study, the magnetic cobalt‑iron composite loaded on carbon derived from cigarette butts (Co Fe@CCB) was successfully prepared for the first time and applied for the activation of peroxymonosulfate (PMS) to degrade Rhodamine B (RhB). The results indicated that approximately 99 % of RhB (50 mg/L) was degraded by Co Fe@CCB (0.04 g/L) activated PMS (0.3 mM) within 15 min. The reactive oxygen species (ROS) in the reaction system were identified to be OH, SO 4 − and 1 O 2 , which responsible for the rapid degradation of RhB. It was also found that RhB could be efficiently removed in real water matrixes, demonstrating that Co Fe@CCB has excellent anti-interference performance. Meanwhile, strong magnetism of Co Fe@CCB made it easy to separate from water and recover for reuse. These results fully proved that Co Fe@CCB has good practical application potential. In addition, the combination of Co Fe@CCB and PMS still exhibited outstanding degradation efficiencies of phenacetin (PNT), bisphenol A (BPA), sulfamethazine (SMZ) and 2,4-Dichlorophenoxyacetic acid (2,4-D). Therefore, this study provides a new method for the reuse of discarded cigarette butts to fabricate catalysts with extremely superior performance and easy to use for PMS activation to eliminate organic pollutants from wastewater.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Vu Hoang Huong,Van-Can Nguyen,Minh Ngoc Ha,Duy Van Pham,Thanh Binh Nguyen,Yuan-Ron Ma,An Bang Ngac,Trinh Thi Loan
The photo-Fenton process serves as a highly efficient approach for removing contaminants from wastewater. In this study, we developed a Fe-doped TiO 2 /SnO 2 heterojunction catalyst to enhance the efficiency of photo-Fenton catalytic activity under visible light . To investigate the physical properties of the catalysts, various characterization techniques were utilized, including XRD , SEM, TEM , HR-TEM, UV-VIS, PL , and XPS . The 7% mol Fe-doped TiO 2 /SnO 2 -OVs (TFS-7) heterostructure exhibited the highest rate constant of 17.03 × 10 −3 min −1 ; 8.4 and 2.1 times higher than the individual components. This enhanced performance is mainly attributed to the rapid migration of photoinduced electrons to Fe 3+ and the subsequent generation of Fe 2+ , which improved electron transfer capacity and facilitated the rapid production of hydroxyl radicals (•OH) through the reaction between Fe 2+ and H 2 O 2 . We proposed a S-scheme mechanism for the Fe-doped TiO 2 /SnO 2 -OVs catalyst based on the analysis of reactive species trapping experiments, photoluminescence (PL) spectra, ultraviolet photoelectron spectroscopy (UPS), and density functional theory (DFT). These findings offer not only a straightforward approach for synthesizing highly active photocatalysts for the degradation of RhB dye, but also a framework for the construction of heterostructure photocatalysts.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Zhaoyang Li,Yongshuai Xie,Yifan Wang,Ying Peng,Zhezhe Deng,Benxue Liu,Guanghui Zhang,Xinqiang Wang,Fengqing Zhang,Luyi Zhu
In this paper, we conducted a study on the structural modulation and photocatalytic performance of single-phase hollow BiFeO 3 nanofibers (SPH–BFO NFs) photocatalysts , investigated the effect of heat treatment temperature on the structure of BFO NFs and the formation mechanism of a hollow structure. The SPH-BFO NFs consist of BiFeO 3 nanocrystals without other heterogeneous phases, with diameters of 400–600 nm and extraordinary flexibility, allowing easy separation of the catalyst from the solution. As a result, the SPH-BFO NFs possess outstanding photocatalytic performance and higher photocatalytic efficiency compared with other forms of BiFeO 3 . In addition, the effects of different environments and water quality on RhB degradation were investigated. It was found that the vacancies (h + ) and superoxide radicals (·O 2 − ) as active substances were less environment-dependent, making the SPH-BFO NFs more resistant to environmental interference. The RhB degradation efficiency of BFO NFs was about 99% in 10 mg/L of RhB dye solution at pH = 6. This work provides valuable insights into the application of SPH-BFO NFs in photocatalysis and the design of nanofiber photocatalysts.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Rui Zhang,Ziyin Chen,Yu Li,Chen Zhao,Lu Cai,Junrong Yu,Ze Yang,Jiacheng Jiang
The unique properties of MOFs make them the best candidates for catalytic and photocatalytic applications. In this research, the NH 2 -UiO-66 material was prepared by solvothermal method , and different content of NH 2 -UiO-66 was added before the composite growth of Bi 2 S 3 and BiOBr nanomaterials to obtain the NH 2 -UiO-66/BiOBr/Bi 2 S 3 ternary composite material. In order to investigate the relationship between the structure and properties of the catalyst, XRD , FT-IR, SEM , HRTEM , UV–vis DRS, XPS and other characterization technologies were used to analyze the structure, morphology, optical properties of the samples, showing that NH 2 -UiO-66/BiOBr/Bi 2 S 3 have been successfully synthesized. Their photocatalytic performance was evaluated based on the photocatalytic degradation of tetracycline hydrochloride and rhodamine B under visible light . The results show that 2% NH 2 -UiO-66/BiOBr/Bi 2 S 3 has better photocatalytic activity than other materials. Moreover, NH 2 -UiO-66/BiOBr/Bi 2 S 3 also demonstrated good photocatalytic reusability and stability. The formation of Bi 2 S 3 and BiOBr heterojunctions and the introduction of NH 2 -UiO-66 with more active sites increase the carrier performance and separation efficiency. Then the valence band and conduction band values of the semiconductor material are calculated through the M-S curve, combined with the forbidden bandwidth deduced by UV–vis DRS and the experimental results of radical trapping, a double Z-type electron transfer mechanism suitable for this system is inferred. Finally, taking RhB as an example, the degradation path of dye pollutants was studied.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Xin Zhan,Xiaoxiao Yu,Benmengyang Li,Rui Zhou,Qingyu Fang,Yiwei Wu
In the presence of thioglycolic acid (TGA) and under the catalysis of Fe 3+ , a simple, rapid, sensitive, selective and effective ratiometric fluorescence sensor platform based on the mixed physically blue nitrogen-doped graphene quantum dots (N-GQDs) as probe signals and orange rhodamine B as internal standard signals has been constructed for analysis of H 2 O 2 in human serum. TGA is the key factor for fluorescence response toward H 2 O 2 by N-GQDs and the mechanism is H 2 O 2 reacts speedily with TGA under the catalysis of Fe 3+ , and produces intermediate of superoxide anions ( O 2 − ), which accepts electrons from N-GQDs, and generates graphene oxide, causing the fluorescence quench of N-GQDs. Compared with N-GQDs probe, the sensitivity of the ratiometric fluorescence sensor platform of N-GQDs/rhodamine B for analysis of H 2 O 2 has been improved by nearly 5-folds. Under the optimum conditions, F λ=580nm / F λ=440nm has a good linear relationship with the concentration of H 2 O 2 and the detection limit of H 2 O 2 is 0.46 μmol/L with 3.5% RSD. The established sensor platform has been successfully used for probing H 2 O 2 in human serum with satisfactory results. The superior performance of the probe lies in its high selectivity and can be directly employed in detecting H 2 O 2 in serum samples without any sample pretreatment procedures.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
·
IF 5.141
Muthuchamy Maruthupandy,Thillaichidambaram Muneeswaran,Gnanasekaran Chackaravarthi,Thirumalaiswamy Vennila,Muthusamy Anand,Wan-Seob Cho,Franck Quero
Tin oxide (SnO 2 ) nanoparticles (NPs) as well as SnO 2 /chitosan(CS) nanocomposites (NCs) were successfully synthesized by a simple chemical precipitation technique and their photocatalytic degradation ability against congo red (CR) and Rhodamine-B (Rh-B) were subsequently evaluated. The crystallinity and surface morphology of the materials were evaluated using X-ray diffraction analysis and transmission electron microscopy (TEM), respectively. The TEM images revealed that nanosized SnO 2 NPs were successfully obtained and were homogeneously distributed within the CS matrix. The CS/SnO 2 NCs were exposed to Rh-B dye molecules, resulting in 95% degradation within 60 min, which was significantly higher than for SnO 2 NPs. On the other hand, CS/SnO 2 NCs were found to degrade 98% of CR dye molecules within 40 min of visible light irradiation, which was also significantly shorter than for SnO 2 NPs. The CR dye molecules experienced significantly better levels of photodegradation parameters than Rh-B. The present study demonstrates the potential of CS/SnO 2 NCs in the area of environmental remediation of organic dye-based water pollutants.
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Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Yanfang Chen,Xuemei Yan,Haifeng Lin,Chao Wang,Jixiang Xu
Background Fe 2+ /H 2 O 2 -based photo-Fenton process is often used in pollutions removal. But, Fe-species related low activity at neutral condition hinders their practical applications. Activation of in situ generated H 2 O 2 for Fenton-like degradation of pollutions through catalysts absences of Fe species is expected. Methods A strip-like benzene and K + co-doped g-C 3 N 4 (KBCN) was constructed by the thermal polymerization of assembly of melamine and 2-aminoterephthalic acid, then post-calcination in LiCl–KCl molten salt, which was then used to degrade Rhodamine B (RhB) and Congo red (CR) via in situ generated H 2 O 2 . Significant findings Benzene and K + co-doping were critical both in increasing charge separation and enhancing the H 2 O 2 production. The yield of H 2 O 2 for KBCN was 57.5 μM in pure water after 60 min irradiation. In the absence of Fe 2+ , the in situ generated H 2 O 2 could subsequently degrade RhB and CR with the formed ·OH. The apparent rate constants of KBCN for RhB and CR degradation were 0.0446 and 0.0497 min −1 , respectively. The advantages of degradation with in situ generated H 2 O 2 in the absence of Fe 2+ can provide a new prospective to the environmental friendly Fenton-like reaction.
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OPTICAL MATERIALS
·
2020
·
IF 2.779
Lanqing Ling,Yu Tu,Xuanyu Long,Qianwen Li,Jiabao Gu,Nan Liu,Zequan Li
The emission of organic dye wastewater poses a great threat to the ecological environment. Therefore, it is necessary to prepare environment-friendly photocatalytic materials with high photocatalytic performance to degrade organic dyes. In this work, a new composite photocatalyst SnS 2 /NH 2 -MIL-125 (Ti) was formed by loading the multiphase SnS 2 of quantum dots (QDs) and hexagonal nanodiscs (NDs) on the NH 2 -MIL-125 (Ti) through one-step hydrothermal method , then used it to remove 40 mg/L Rhodamine B (RhB) under visible light . Compared with SnS 2 and NH 2 -MIL-125 (Ti), the photocatalytic degradation activity of the 12 wt% SnS 2 /NH 2 -MIL-125 (Ti) was enhanced by 2.4 and 2.1 times respectively, reaching 90.5%, after 80 min of visible light irradiation. The four times recycling test shows that this photocatalyst has outstanding stability and durability. Through analysis, NH 2 -MIL-125 (Ti) modified SnS 2 can improve visible light absorption, provide more active sites and inhibit photoelectron-hole recombination, thus enhancing photocatalytic activity . Superoxide radical (•O 2 − ) and hole (h + ) were determined to be the key active substances in the process by the reaction substance capture experiment. The photodegradation mechanism of RhB is also investigated and studied in detail. This novel multiphase SnS 2 /NH 2 -MIL-125 (Ti) material provides a new perspective for the design of organic-inorganic composite photocatalysts with excellent performance and improved stability, and has potential application in environmental purification.
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JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 2
·339-345
·
IF 1.947
Zuo Guihong,Wang Anqi,Yang Ying,Huang Hailiang,Wang Fangbiao,Jiang Hongwei,Zhang Lei,Zheng Youjin
Recently, Ag/AgCl has been widely researched by various methods and used as photocatalyst to degrade organic dyes due to its excellent photocatalytic properties under visible light. In this paper, a novel visible-light-driven plasmonic photocatalyst Ag/AgCl@ZIF-8 was successfully prepared by depositing AgCl nanoparticles into the ZIF-8 crystals, and then reducing partial Ag + ions of AgCl nanoparticles to Ag 0 species under UV light irradiation. All as-synthesized samples were characterized by XRD, SEM, TEM, BET and UV–Vis diffuse reflectance spectra. The photocatalytic activity of all as-synthesized samples was evaluated by degradation RhB solution under visible light irradiation. The results show that AgCl nanoparticles are well dispersed and inlaid in the body of ZIF-8 crystals, and partial Ag + ions of AgCl nanoparticles are reduced into Ag 0 species after 30 min of UV light irradiation.The as-synthesized Ag/AgCl@ZIF-8 keeps the high surface area of ZIF-8 and holds the excellent photo-properties of Ag/AgCl. The photocatalytic activity of all as-synthesized sample were evaluated by degradation RhB solution under visible light irradiation. Ag/AgCl@ZIF-8 exhibited the highest photocatalystic activity, which could degrade 99.12% RhB. The synergistic effect of Ag/AgCl and ZIF-8 makes Ag/AgCl@ZIF-8 possible to be used for the degradation of organic dye by using sunlight.
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JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Yanlin Zhang,Churu Xie,Feng Long Gu,Honghai Wu,Qiang Guo
Organic pollutants as typical water contaminants are potentially harmful to human health. In this study, we suggested that the novel Ag 3 PO 4 /N-doped graphene (NG)/Poly(3-hexylthiophene) (P3HT) composites can remove the organic dye Rhodamine B (RhB) from water. This Ag 3 PO 4 -based photocatalyst was synthesized via a facile method and subsequently characterized by XRD, SEM, TEM, XPS, Raman spectroscopy, PL spectroscopy, and UV–vis DRS. The photocatalytic activity of Ag 3 PO 4 /NG/P3HT composites is significantly higher than that of pristine Ag 3 PO 4 , Ag 3 PO 4 /NG, and Ag 3 PO 4 /P3HT for RhB degradation under visible light irradiation, especially the kinetic constant of Ag 3 PO 4 /NG/P3HT is more than 6 times of pristine Ag 3 PO 4 . The reactive oxygen species trapping experiments indicate that the degradation of RhB over the Ag 3 PO 4 /NG/P3HT composites mainly results from the holes oxidation and superoxide radical reduction. Besides, Ag 3 PO 4 /NG/P3HT composites exhibit better recyclability and stability than pristine Ag 3 PO 4 . Furthermore, the photocatalytic mechanism of Ag 3 PO 4 /NG/P3HT composites for RhB degradation under visible light was proposed as the synergistic effect of irradiated Ag 3 PO 4 , P3HT and NG sheets on the effective separation of photogenerated electron-hole pairs, and the enhancement of visible light absorbance.
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