CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jie Ren,Yuan Yu,Yanning Qu,Dongfeng Sun,Wenhui Chu,Qingmei Su,Linyin Huang,Bingshe Xu
Z-scheme photocatalyst was researched in recent years due to its bionic electron transfer structure, while there were still challenges on amount of electron-hole pairs and preservation of redox ability in above systems. In this work, a new dual Z-scheme MoO 3 /ZnIn 2 S 4 /black phosphorus quantum dots (MZBP) heterojunction was constructed to solve above problems and employed for photocatalytic hydrogen (H 2 ) evolution. According to the results, the H 2 generation efficiency of MZBP reached to 5.45 mmol/g/h under visible light irradiation, which were 10 and 1.6 times higher than that of pure ZnIn 2 S 4 and MoO 3 /ZnIn 2 S 4 (MZ) material, respectively. The apparent quantum yield (AQY) of MZBP was calculated as 13.2% at 420 nm, indicating its high energy conversion property. In general, the enhanced separation ability of photo-induced carriers and large redox surfaces of dual Z-scheme MZBP system played important roles for enhancement of H 2 evolution. According to the high-efficiency H 2 evolution performance and significant dual Z-scheme mechanism, the novel heterojunction was promising for more applications in photoelectric fields.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuanhao Ouyang,Honghui Jiang,Haoxiang Zhong,Guoyu Li,Xiaodong Ji,Qi Jin,Wei Xue,Xinjiang Hu,Mingshan Zhu
Algal blooms have resulted in the buildup of microcystin (MC-LR) in water bodies, posing a severe hazard to the safety of the aquatic ecosystem and human health. This study produced a g-C 3 N 4 with N 2C -type defects/MoO 3 Z-scheme photocatalyst (D-CN/MoO 3 ) for MC-LR degradation in visible light. D-CN/MoO 3 could photodegrade 100 % MC-LR within 25 min, which was substantially more significant than pure g-C 3 N 4 (12.5%). Meanwhile, the kinetic constant was 32.5 times higher than pure g-C 3 N 4 , attributed to the defect engineering and Z-scheme heterojunction cooperative interaction. Based on the LC-MS results, the vital degradation mechanism is the selective assault of 1 O 2 on the Adda side chain of MC-LR and the following decarboxylation reaction of h + , which leads to effective mineralization and reduced toxicity of MC-LR. Moreover, the excellent stability and adaptability of D-CN/MoO 3 are verified and have a significant potential for application in the decontamination of MC-LR in eutrophic water.
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 11
·e202204286
·
IF 2.1
Yating Zeng,Hanping Fu,Liran Liu,Li Feng,Tianxiang Zhang,Qingshuang Liang,Xiufeng Xiao
Graphical A novel 2D/1D/-2D RP/BP-MBWO composed of in situ junction and Z-scheme system has been successfully synthesized. Benefiting from this favourable interfacial and structural characteristics, the fabricated BP/RP-MBWO photocatalyst shows a sharply improved photocatalytic H 2 and H 2 O 2 evolution performance. Exploring multifunctional photocatalysts with rational design and construction of unique transport channels is of great significance for the value-added chemicals production and environmental remediation. In this work, a novel 2D/1D/-2D RP/BP-MBWO dual heterostructure photocatalyst has been successfully synthesized by loading the in-situ grown 2D/1D RP/BP heterostructure on the 2D Bi 2 WO 6 nanosheets. through simple ultrasonic agitation.Benefiting from this favourable interfacial and structural characteristics, the fabricated BP/RP-MBWO photocatalyst shows a sharply improved photocatalytic H 2 and H 2 O 2 evolution performance. Excitingly, the optimal of H 2 O 2 production rate of the BP/RP-Bi 2 WO 6 composites is as high as 622.5 μmol g −1 h −1 under visible light irradiation, which is approximately 15 times as that of pure MBWO. The hydrogen production performance of the complexes was significantly improved compared to the pure MBWO samples. When the BP/RP loading was 20 %, the prepared nanocomposites showed the highest photocatalytic hydrogen evolution efficiency with the hydrogen production rate of about 0.77 μmol ⋅ g −1 ⋅ h −1 . This work is expected to offer a new inspiration for the rational design and construction of effcient photocatalyst systems toward solar energy capture and conversion.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yixuan Zhang,Cong Liu,Ye Zhou,Jinnan Wang,Aimin Li,Philippe François-Xavier Corvini
Hollow double-shelled Ag@SrTiO 3 -TiO 2 with Z-scheme heterostructure was constructed for highly efficient photocatalytic reduction of nitrate to N 2 . The 3D finite-difference-time-domain analysis indicated that hollow double-shelled structure improved light harvesting due to multiple reflections. Photo-generated electrons transfer from SrTiO 3 to Ag 0 caused by electron sink effect were utilized to reduce nitrate, while photo-generated electrons of TiO 2 migrated to SrTiO 3 via transport bridge of Ti 3+ defects for electron–hole recombination. Such charge carriers migration pathway facilitated the construction of Z-scheme heterostructure, which enhanced charge separation yet still retained high redox powers. Both photogenerated electrons and CO 2 − played important role in photocatalytic denitrification. Furthermore, Ag 0 acted as co-catalyst which not only promoted photogenerated electrons transfer to nitrate but also enhanced nitrate conversion selectivity to N 2 . Combining the above advantages, nitrate removal rate and the nitrogen selectivity reached 97.2 % and 98.8 % within 60 min, respectively. Even after five cycles, it still remained satisfied photocatalytic activity and stability. In summary, this work proposed a feasible strategy to construct Z-scheme hollow double-shelled photocatalyst for efficient photocatalytic denitrification.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chunchun Wang,Shijie Li,Mingjie Cai,Ruyu Yan,Kexin Dong,Junlei Zhang,Yanping Liu
Constructing novel Z-scheme heterojunctions is an effective strategy for obtaining high-performance photocatalysts. Herein, tetra (4-carboxyphenyl) porphyrin (TCPP) and graphene quantum dots (GQDs) were loaded on the surface of Bi 2 MoO 6 (BMO) to fabricate novel Z-scheme heterojunctions of TCPP/G/BMO. Especially, TCPP/G/BMO-2 showed an exceptional visible-light photoactivity for tetracycline (TC) degradation (81.0%, 40 min) and Cr(VI) reduction (90.7%, 60 min), respectively by 2.38 folds and 2.96 folds enhancement compared to sole Bi 2 MoO 6 . The substantial enhancement of activity is attributed to the synergy effect of the Z-scheme charge transfer mechanism and the improved light absorption. The degradation pathways of TC were inferred by determining the generated intermediates using high performance liquid chromatography-mass spectrometry (HPLC-MS), and the toxicity of the transformation products was assessed by Toxicity Estimation Software Tool (T.E.S.T). Overall, on the basis of trapping experiments and electron spin resonance spectra (ESR) analysis, the photocatalytic mechanisms of Cr(VI) reduction and TC degradation by the TCPP/G/BMO Z-scheme heterojunction was proposed. This work indicates TCPP/G/BMO could be a promising photocatalyst for wastewater treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
J. Ma,B. Zhao,N. Shao,P. Jiang,H. Yang,B. Li
Photocatalysis is considered a promising strategy for environmental remediation, and the preparation of an efficient, stable, and green photocatalyst is a current urgent need. In this work, a magnetically recoverable SnFe 2 O 4 /Bi 2 WO 6 (SFO/BWO) Z-scheme heterojunction was successfully prepared by a simple one-step hydrothermal process. The prepared 7.5%SFO/BWO nanocomposite exhibited excellent photocatalytic performance, with a degradation efficiency of 96.12% for Rhodamine B (RhB) within 120 min, which were respectively 1.64 and 2.07 times greater than that of pure Bi 2 WO 6 (BWO) and SnFe 2 O 4 (SFO). This obvious improvement in the photocatalytic performance benefited from the increase in the separation efficiency of photogenerated carriers and was based on the construction of Z-scheme heterojunction. Additionally, the radical capture tests demonstrated the main reactive radicals were electron (e − ), hole (h + ), and hydroxy radical (•OH) in the photodegradation system. Furthermore, the composite retains excellent photocatalytic performance after five cycles and is easily recoverable due to its magnetic behavior. Notably, during the toxicity assessment, it was proved that SnFe 2 O 4 /Bi 2 WO 6 could be used to eliminate the toxicities of dyes and antibiotics rapidly. Consequently, SnFe 2 O 4 /Bi 2 WO 6 is a promising and competitive photocatalyst in wastewater remediation.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Junge Zhang,Yuan Ding,Xianggang Ma,Yingliang Liu,Li Zhang,Kunlun Wang,Shaokui Cao,Shengang Xu
The rapid recombination of photogenerated carriers and the narrow absorption range of visible light greatly limit the photocatalytic activity of graphite carbon nitride (g-C 3 N 4 ). Herein, g-C 3 N 4 was jointly modified by carbon dots (CDs) and copolymerization via in situ co-calcining of three precursors (urea, glucose and 2-amino-5-iodo-benzonitrile (I-ABN)), and named as I-ABN x -C 3 N 4 @CDs y . Then, solid-state Z-scheme photocatalysts PC1–PC9 with CDs as the electron mediators were prepared via in situ growth of BiOI on the surface of I-ABN x -C 3 N 4 @CDs y through solvothermal method. The optimal proportion of each component was explored through orthogonal experiments. The existence of CDs act as an electron transport medium to accelerate the transportation rate of photogenerated carriers, improve the light absorption capacity. The copolymerization with I-ABN introduce benzene rings and I − to g-C 3 N 4 , which enhance the light absorption capacity and photoelectric efficiency. The Z-scheme heterojunction effectively suppresses the recombination of photogenerated electron–hole pairs. Therefore, PC1–PC9 presented excellent performance for the degradation of BPA due to the synergistic effects of the above three points. Among them, PC6 showed the best photocatalytic activity, which completely degraded BPA (15 mg/L) within 40 min, and whose rate constant (0.091 min −1 ) was 22.8 times that of bulk g-C 3 N 4 . The active radical trapping experiment determined •O 2 − and h + were the main active radicals. Finally, the BPA degradation mechanism by PC6 was proposed. This study provides new insights for the combination of heterojunction, carbon dots, and copolymerization to rationally design efficient photocatalysts to restore the environment.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lixiang Zhang,Luping Feng,Pan Li,Xi Chen,Yuan Gao,Yushuang Gong,Zhongling Du,Sheng Zhang,Anchao Zhang,Guofu Chen,Hua Wang
A direct Z-scheme heterojunction has been constructed by loading cadmium sulfide (CdS) on cobalt sulfide doped with nitrogen (N-CoS x ) by N 2 plasma treatment for efficient photocatalytic Cr(VI) reduction under visible light. It was discovered that the resulting CdS/N-CoS x nanocomposites could present different photocatalytic performances controllably depending on the plasma treatment time and CdS-to-N-CoS x ratios. Especially, the one with 5-min plasma treatment and 8/1 M ratio could exhibit the highest Cr(VI) photoreduction efficiency, which is over four and two folds higher than those of pristine N-CoS x and CdS, respectively. Herein, the plasma-assisted N doping could not only increase the surface wettability and conductivity of CoS x but also decrease its Fermi level for improving the photocatalytic Cr(VI) reduction. More importantly, a direct Z-scheme heterojunction could be constructed by the combination of CdS and N-CoS x with suitable band structures, which could further booster the charge separation and transferring, without sacrificing the redox capacity of photogenerated carriers. The enhanced photocatalytic activity and stability of CdS/N-CoS x nanocomposites could thereby be expected for Cr(VI) reduction, with the efficiency up to 100% within 25 min. Such a direct Z-scheme heterojunction created by the plasma treatment route may promise for the large-scale applications for the removal of various toxic pollutants in the environmental remediation field.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Shi-Wen Lv,Jing-Min Liu,Ning Zhao,Chun-Yang Li,Fei-Er Yang,Zhi-Hao Wang,Shuo Wang
Photocatalysis is a promising strategy to remove contaminants from wastewater. Herein, a novel g-C 3 N 4 @CoFe 2 O 4 /Fe 2 O 3 composite was synthesized via a feasible hydrothermal and calcination method. Benefiting from the Z-scheme heterojunction formed between MOF-derived CoFe 2 O 4 /Fe 2 O 3 and g-C 3 N 4 , the recombination of photoinduced electrons and holes could be inhibited effectively. Meanwhile, doping a little amount of MOF-derived CoFe 2 O 4 /Fe 2 O 3 could remarkably enhance visible light absorption ability of g-C 3 N 4 and reduce band gap of g-C 3 N 4 . Then, the resulting hybrid photocatalysts were employed as a high-efficient mediator to activate persulfate for degrading emergent organic contaminants under visible light irradiation. Significantly, TC of 99.7%, BPA of 98.1%, SMX of 94.8%, DFC of 97.0%, IBP of 96.1% and OFX of 96.5% could be removed within 80 min. Some important factors influencing photocatalytic degradation process were also investigated. The trapping experiments and EPR tests revealed that both SO 4 − and OH were involved in photocatalytic reaction. Besides, the introduction of MOF-derived CoFe 2 O 4 /Fe 2 O 3 provided a new approach for generating radical species. More importantly, obtained g-C 3 N 4 @CoFe 2 O 4 /Fe 2 O 3 -2 composites with good stability exhibited great application potential in the actual degradation tests. To sum up, current work provided novel ideas for photocatalytic oxidation technology in the organic pollution degradation.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lixiang Zhang,Luping Feng,Pan Li,Xi Chen,Jiatian Jiang,Sheng Zhang,Chunxian Zhang,Anchao Zhang,Guofu Chen,Hua Wang
A visible-light-driven photoelectrochemical (PEC) sensor has been developed for probing Hg 2+ with “turn-on” signal output using hollow CoS x @CdS polyhedron as direct Z-scheme photocatalyst and Hg 2+ -recognition probe. The CoS x @CdS heterojunction photocatalysts were fabricated by growing CdS nanoparticles on the surface of cobalt sulfide (CoS x ) via one-pot solvothermal route using metal-organic frameworks (MOFs) of ZIF-67 polyhedrons as the sacrificial templates and cobalt precursors. It was discovered that the photocurrent responses of the CoS x @CdS-modified ITO electrodes could be specifically turned on by Hg 2+ , in contrast to these of the CoS x or CdS-modified ones showing no significant Hg 2+ -induced photocurrent. Under visible light irradiation, herein, the synergetic combination of CoS x and CdS components could improve the carriers transferring of PEC system. More importantly, the photocurrents of the PEC sensor could be greatly enhanced in the presence of Hg 2+ through the selective ion-exchange reaction to trigger the in-situ formation of a new Z-scheme heterojunction of CoS x @CdS/HgS photocatalysts, achieving the further promoted charge transferring and suppressed recombination of photogenerated electron-hole pairs. The developed double heterojunctions-based PEC sensors can detect Hg 2+ with the concentrations ranging from 0.010 to 1000 nM, which performances are much better than those of the current PEC analysis methods. Besides, such a MOF-templated one-pot construction route may pave the way toward the design of various direct Z-scheme heterojunction photocatalysts of PEC probes of great interest.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yuan Lin,Qiao Zhang,Yuhang Li,Yunpeng Liu,Kejia Xu,Jiangnan Huang,Xiaosong Zhou,Feng Peng
An incompletely covered CdS/ZnS core/shell is synthesized via a simple hydrothermal method. Due to the defect energy levels introduced by zinc vacancies, the typical type-I heterojunction of CdS/ZnS evolves to a type-II heterojunction and Z-scheme hybrid structure so that the ZnS shell can timely transfer and capture the photogenerated holes from the CdS core. The surface photovoltage (SPV) distribution caused by photogenerated charges on the surface of catalyst is visually presented by Kelvin probe force microscopy with synchronous illumination (microscope SPV). It intuitively proves the effective spatial separation of photogenerated holes from the CdS core to the ZnS shell, for the first time. Under optimal conditions, the highest hydrogen production rate of CdS/ZnS reached 24.1 mmol g–1 h–1 under visible light illumination. The average apparent quantum yield of 9.3% can be achieved for 9 h of illumination (λ = 420 ± 5 nm). It exhibits highly efficient photocatalytic H2 evolution with well stability.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Zhiyu Liu,Liang Chen,Congcong Piao,Jianhe Tang,Yu Liu,Yitong Lin,Dawei Fang,Jun Wang
A novel Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is prepared via hydrothermal and calcination methods. In this system, WO 3 :Yb 3+ ,Er 3+ is used as an excellent up-conversion luminescent agent and highly active photocatalyst to broaden the light response range. Ag with SPR effect is regarded as electronic channel and cocatalyst to accelerate electron transfer and increase hydrogen production. The photocatalytic performance of Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is assessed by levofloxacin degradation with synchronous hydrogen production. Some influence factors, sunlight irradiation time, sacrificial agent concentration and catalyst cycle number, are discussed. The emission light spectrum and energy conversion mechanism of WO 3 :Yb 3+ ,Er 3+ are studied. The photocatalyst gives prominent degradation ratio (90.44 %) and hydrogen production amount (489.02 μmol/g) under sunlight irradiation for 180 min. It shows a high stability and reusability in levofloxacin degradation with synchronous hydrogen production within five cycles. The possible mechanism of levofloxacin degradation with synchronous hydrogen production caused by Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is proposed.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）