CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Guowei Wang,Hefa Cheng
In recent decades, the overuse and misuse of antibiotics have caused serious harm to aquatic ecosystems . This work successfully designed a unique recyclable WO 3 /NiFe 2 O 4 /BiOBr (WNB) composite with dual Z-scheme heterojunction to degrade levofloxacin (LEV) in aqueous solution. The results indicated that the as-prepared WNB composite displayed the greatest sonocatalytic activity for LEV degradation. In particular, WNB showed the highest LEV (at 10 mg/L) removal efficiency (97.97 %) within 75 min under ultrasonic irradiation. The significantly enhanced catalytic activity of WNB was attributed to the unique dual Z-scheme structure, which makes it easier for the transfer and the spatial separation of photo-generated electron-hole (e − -h + ) pairs, and dramatically increases the carrier lifespan. Furthermore, the ternary composite comprises three different semiconductors from narrow to broad bandgap, which are suitable for harvesting full-spectrum light. The recycle experiments demonstrated the catalyst's excellent sonocatalytic stability and easy recovery, which is attributed to its magnetic property. Furthermore, based on the intermediates identified during the degradation process, a potential mechanism and pathway for LEV degradation were presented. This work provides a unique perspective on designing efficient sonocatalysts for environmental remediation.
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Yang Wang,Sheng Feng,Changchang Ma,Yun Zhou,Zhiwei Ye,Xiaojun Dai,Xun Cao
In this paper, a novel Mn-doped CdS@NH 2 -MIL-125(Ti) (MC@NT) photocatalytic composites was synthetized through hydrothermal method . Hydrogen desorption and tetracycline and oxytetracycline degradation were performed under visible light to test their photocatalytic activities . The composites were characterized by XRD , FTIR, SEM, TEM, XPS , UV–Vis diffuse reflectance spectroscopy (DRS), EPR , EIS, and transient photocurrent response. From the characterization consequence, it could be seen that Mn-doped CdS was tightly attached to the surface of tetragonal NT in the form of nanoparticles . The MC@NT composites exhibited more promising catalytic activity than pristine monomeric materials. The photocatalytic hydrogen evolution rate reached 3.61 mmol g −1 h −1 . Within 110 min, the degradation efficiencies of TC and OTC were 90% and 88%, respectively. The free radical trapping experiments proved that ·O 2 − and h + were decisive role for degrading pollutants in the degradation catalysis process. Radical trapping experiments and electron spin resonance (ESR) indicated that the Z-scheme heterojunction was formed between Mn-doped CdS and NT, leading to facilitate the migration and shift of photogenerated carriers and holes. Cycling experiments showed that the as-prepared composites have good stability and have good prospects for practical applications. We believe this work will offer new ideas on the future development of efficient heterojunction catalysts for light energy conversion and other applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Jiahao Lai,Peng Xiao,Yafei Li,Shihai Cui,Jing Yang,Hongzhen Lian
Broadening the light absorption and inhibiting carrier's recombination are vital to the improvement of photocatalytic performance. Herein, self-assembly 3D hierarchical microsphere BiOIO 3 /Bi 5 O 7 I Z-scheme heterojunction with carrier transfer channel was firstly fabricated by in-situ solvothermal method. The degradation efficiency for bisphenol A (BPA) reached 98.9 % within 60 min visible light irradiation. The enhanced photocatalytic activity was benefited from the Z-scheme system assisted by iodate/iodide (IO 3 - /I - ) as carrier transfer channel that not only accelerated the interfacial charge separation, but also provided massive reactive centers for obtaining high redox capacity. The vulnerable sites and the degradation pathways of BPA were identified by density functional theory calculations and liquid chromatography-mass spectrometry analyses. The toxicity of BPA and its intermediates were predicted by ECOlogical Structure Activity Relationship (ECOSAR) and the results demonstrated that BPA was eventually mineralized to harmless products. The Z-scheme charge transfer mechanism was deeply elucidated based on the role of active species (·O 2 - , ·OH and h + ), band structure and carrier separation efficiency. This study provides a promising strategy for the photoactivity enhancement of bismuth based heterojunction in environment purification.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Pengfei Zhu,Xiaolong Wu,Xingyang Xiao,Ming Duan,Dan Luo,Jinru Lin
In this work, Bi 12 O 17 Cl 2 and ZIF-8 were synthesized via a facile in-situ precipitation method, while ZnO-CN was obtained through the pyrolysis of ZIF-8. Then, a novel Bi 12 O 17 Cl 2 /ZnO-CN composite catalyst with Z-scheme heterojunction was prepared by mechanical mixing-low temperature activation method. When the ZnO-CN is pyrolyzed at 550 ℃ and accounts for 10 wt% in the Bi 12 O 17 Cl 2 /ZnO-CN composite, the composite exhibited a significantly higher degradation rate for levofloxacin hydrochloride (LVX) (94.50%) compared to Bi 12 O 17 Cl 2 (67.30%) and ZnO-CN (36.80%), while also achieving a high removal rate of Cr(VI) under acidic conditions (92.00%). And the toxicity of LVX to wheat decreased significantly after photocatalytic degradation. Meanwhile, the Bi 12 O 17 Cl 2 /ZnO-CN has good universality, salt resistance and reuse stability. The experimental results of sample characterization show that the improved photocatalytic performance of Bi 12 O 17 Cl 2 /ZnO-CN composite can be attributed to the high-efficiency separation of electron-hole pairs (e - -h + ), enhanced light absorption in the visible region, increased specific surface area and active sites. Both the free radical capture experiment and electron paramagnetic resonance (EPR) test indicate that •O 2 - and h + are the primary active species in the process of degrading LVX by Bi 12 O 17 Cl 2 /ZnO-CN. Combined with mechanism exploration experiment and iquid chromatography-mass spectrometry (LC-MS) analysis, a possible direct Z-scheme heterojunction electron transfer mechanism and photocatalytic degradation pathways for LVX was proposed. This work enhances the photocatalytic performance of Bi 12 O 17 Cl 2 and provides an idea for antibiotic or Cr(VI) wastewater treatment.
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Nanoscale
·
2022
·Vol. 14
·期 18
·7055-7074
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IF 8.307
Rutong Song,Jun Yao,Mei Yang,Zhongbin Ye,Zhuang Xie,Xiang Zeng
Water pollution control is one of the major challenges currently faced. With the development of photocatalytic technology, an increasing number of new and efficient catalysts have been developed, but most of the catalysts have limited light capture ability and catalytic degradation efficiency. Therefore, in this work, hydrogen peroxide was further introduced to establish a photo-Fenton system to improve the photocatalytic effect by constructing a Z-scheme, and the degradation ability of the catalyst was maximized. Moreover, we successfully adhered bismuth tungstate nanosheets onto the surface of a MIL-101(Fe) framework and changed the number of active sites with iron ions of different doping amounts. We found that the number of active sites in the photo-Fenton system does not increase linearly, but increases and decreases regularly, which is similar to the change in band structure after doping. In addition, the results of the radical scavenger experiment and electron paramagnetic resonance (EPR) revealed that both hydroxide radical (˙OH) and superoxide radical (˙O2−) participated in methylene blue (MB) degradation, of which ˙OH was the main active species for pollutant degradation. Based on high-performance liquid chromatography-mass spectrometry (HPLC-MS) analysis, the possible degradation pathways were proposed. We believed that this work will provide insights into the heterojunction photo-Fenton system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Yanhua Cui,Zengkai Wang,Jian Zheng,Binrong Li,Yongsheng Yan,Minjia Meng
The enhancement of the self-cleaning ability of photocatalytic membranes and their degradation efficiency over tetracycline (TC) still remains a challenge. In this study, an alternative silver vanadate quantum dots (AgVO 3 QDs) doped reduced graphene oxide (RGO) and graphitic carbon nitride (C 3 N 4 ) nanocomposites modified polyvinylidene fluoride (PVDF) membrane (AgVO 3 /RGO/C 3 N 4 -PVDF) was successfully fabricated to enhance the photocatalytic activity. The AgVO 3 /RGO/C 3 N 4 nanocomposites were functioned as the active component for the photocatalytic membrane. The unique Z-scheme heterostructure of AgVO 3 /RGO/C 3 N 4 and the porous PVDF framework synergistically enhanced the separation and transport efficiency of photogenerated carriers and facilitated the interaction between the photocatalyst and the pollutant. As a result, the degradation efficiency of TC for the AgVO 3 /RGO/C 3 N 4 -PVDF reached 88.53% within 120 min, which was higher than those of the binary component membranes (64.8% for RGO/C 3 N 4 -PVDF and 79.18% AgVO 3 /C 3 N 4 -PVDF). In addition, AgVO 3 /RGO/C 3 N 4 -PVDF exhibited high permeability (1977 L·m −2 ·h −1 ·bar −1 ) and excellent antifouling activity. Under visible-light irradiation, the flux recovery rate ( FRR ) increased from 92.4% to 99.1%. Furthermore, AgVO 3 /RGO/C 3 N 4 -PVDF could reject 97.4% of Escherichia coli ( E. coli ) owning to its self-cleaning capacity, and eliminated the E. coli under visible-light irradiation trough the photogeneration of h + . This study highlights a highly efficient photocatalytic membrane based on a Z-scheme heterostructure, which may have a great potential application in practical wastewater treatment.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2021
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IF 3.995
Zhiyu Liu,Jianhe Tang,Congcong Piao,Xing Zhang,Xiaochen Qi,Ying Tian,Dawei Fang,Jun Wang
A novel Z-scheme CaF 2 :Yb 3+ ,Er 3+ @ZnTiO 3 /Au/CdS photocatalyst has been prepared. In this system, an excellent up-conversion luminescent agent, CaF 2 :Yb 3+ ,Er 3+ , is introduced to broaden the light response range. The Au surface plasmon resonance effect endows the system with highly efficient charge transfer. The photocatalytic activity of the Z-scheme CaF 2 :Yb 3+ ,Er 3+ @ZnTiO 3 /Au/CdS photocatalyst has been evaluated in the degradation of norfloxacin (NOR) with simultaneous hydrogen production . Some influencing factors, such as solar light irradiation time, sacrificial agent concentration, and number of reuse cycles, are discussed. The emission spectrum and energy conversion mechanism of CaF 2 :Yb 3+ ,Er 3+ have also been studied. The prepared photocatalyst facilitated a significant degree of degradation (92.05%) of NOR and considerable hydrogen production (513.39 μmol/g) under solar light irradiation for 5.0 h. Moreover, it showed high stability in photocatalytic NOR degradation with simultaneous hydrogen production over five cycles. A possible mechanism for photocatalytic degradation of NOR with simultaneous hydrogen production promoted by the Z-scheme CaF 2 :Yb 3+ ,Er 3+ @ZnTiO 3 /Au/CdS photocatalyst is proposed.
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Advanced Science
·
2021
·Vol. 9
·期 2
·2102530
·
IF 16.806
Fazal Raziq,Amil Aligayev,Huahai Shen,Sharafat Ali,Rahim Shah,Sajjad Ali,Syedul H. Bakhtiar,Asad Ali,Naghat Zarshad,Amir Zada,Xiang Xia,Xiaotao Zu,Muslim Khan,Xiaoqiang Wu,Qingquan Kong,Chunming Liu,Liang Qiao
Artificial Z-scheme, a tandem structure with two-step excitation process, has gained significant attention in energy production and environmental remediation. By effectively connecting and matching the band-gaps of two different photosystems, it is significant to utilize more photons for excellent photoactivity. Herein, a novel one-photon (same energy-two-photon) Z-scheme system is constructed between rGO modified boron-nitrogen co-doped-WO 3 , and coupled CdSe quantum dots-(QDs). The coctalyst-0.5%Rh x Cr 2 O 3 (0.5RCr) modified amount-optimized sample 6%CdSe/1%rGO3%BN-WO 3 revealed an unprecedented visible-light driven overall-water-splitting to produce ≈51 µmol h −1 g −1 H 2 and 25.5 µmol h −1 g −1 O 2 , and it remained unchanged for 5 runs in 30 h. This superior performance is ascribed to the one-photon Z-scheme, which simultaneously stimulates a two photocatalysts system, and enhanced charge separation as revealed by various spectroscopy techniques. The density-functional theory is further utilized to understand the origin of this performance enhancement. This work provides a feasible strategy for constructing an efficient one-photon Z-scheme for practical applications.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Xiuhui Li,Zongxue Yu,Liangyan Shao,Haojie Zeng,Yuchuan Liu,Xiaofang Feng
A novel strategy to construct a visible-light-driven Z-scheme heterojunction catalyst was employed by crosslinking ZnAl-layered double hydroxide (ZnAl-LDH) nanosheets with the active phase on carbon nitride (g-C 3 N 4 ) substrates via a polydopamine bridge (a similar "bridge" structure). In this paper, multiple optical and electrochemical detection methods indicated that the 0.5P-LDH_500CN photocatalyst demonstrated excellent visible-light absorption properties, photo-generated electron-hole separation ability and photocatalytic activity for p-nitrophenol under visible-light (> 420 nm), etc. A Z-scheme charge transfer mechanism via PDA bridge was proposed to achieve heterojunction charge separation. This mechanism involved the recombination of photo-induced electrons directly on the ZnAl-LDH_500 valence band through the PDA channel and the holes were captured at the conduction band energy level of the g-C 3 N 4 . The detection of active species, including O 2 -, h + and OH, further proofed the Z-scheme charge transfer mechanism, which could be speculated that all active species affected the photocatalytic reaction with the order of h + > OH > O 2 -. Meanwhile, this work also exposed that the formation of active phase in ZnAl-LDH could synergize with PDA to promote the application of visible-light-active photocatalysts based on g-C 3 N 4 materials in high-efficiency energy.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Wei Chen,Rui-Qiang Yan,Jian-Qun Zhu,Guo-Bo Huang,Zhong Chen
All-solid-state Z-scheme CdS/QDs/ZnIn 2 S 4 architectures with MoS 2 quantum dots as solid-state electron mediator were successfully designed and constructed by optimally combining one-dimensional CdS nanorods, zero-dimensional MoS 2 quantum dots (QDs) and two-dimensional ZnIn 2 S 4 nanosheets. The photocatalytic water splitting for hydrogen evolution demonstrated that such structural design can synergistically trigger remarkably improved visible-light-driven photocatalytic activity. Photocatalytic H 2 -evolution at 2107.5 μmol g −1 h −1 was achieved on this CdS/QDs/ZnIn 2 S 4 architectures under visible light irradiation, exceeding those of bare CdS nanorods and pure ZnIn 2 S 4 nanosheets by a factor of 26 and 62, respectively. This highly efficient photocatalytic activity arises from the effective charge separation and favourable electron mediator of MoS 2 QDs. The Z-scheme charge separation mechanism was verified by the ESR, PL-TA and organic electron acceptor test.
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Environmental Science-Nano
·
2019
·Vol. 6
·期 12
·3670-3683
·
IF 7.704
Hui Li,Fang Deng,Yang Zheng,Li Hua,Chunhua Qu,Xubiao Luo
Fabrication of Z-scheme heterojunctions and crystal facet engineering are effective strategies for enhancing visible-light photocatalytic redox ability. Visible-light-responsive Z-scheme reduced graphene oxide (rGO)/Bi2S3–BiOBr heterojunctions with a tunable exposed BiOBr (102) facet and high stability were prepared by a one-pot solvothermal strategy. A graphene oxide (GO) solution acts as a rGO precursor and crystal facet controlling agent of BiOBr (102). The optimized 1% rGO/Bi2S3–BiOBr catalyst shows a much higher photocatalytic activity in degrading a single-component 2-nitrophenol (2NP) solution and a reducing single-component Cr(VI) solution than Bi2S3, BiOBr and Bi2S3–BiOBr. In the mixture solution of 2NP and Cr(VI), 2NP degradation and Cr(VI) reduction occur simultaneously, and the Cr(VI) reduction efficiency and 2NP degradation efficiency reached 95% and 67%, respectively. The synergism of rGO/Bi2S3–BiOBr for simultaneous 2NP degradation and Cr(VI) reduction can be attributed to the efficient production of electrons and reactive oxygen species. This work sheds light on the design of facet-dependent Z-scheme photocatalysts to advance photocatalytic redox capability.
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CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Xiaoying Lu,Wenjie Che,Xiufeng Hu,Yi Wang,Aiting Zhang,Fang Deng,Shenglian Luo,Dionysios D. Dionysiou
The pollution of pharmaceutical wastewater has attracted global attention. Photocatalysis is an attractive yet challenging method for the degradation of pharmaceutical residues. Fabricating efficient Z-scheme heterojunctions with intimate interface contact for enhancing the performance of photocatalysts is a challenge. Herein, novel visible-light-driven direct Z-scheme CuInS 2 /Bi 2 WO 6 heterojunctions with intimate interface contact were successfully synthesized by in situ hydrothermal growth of Bi 2 WO 6 directly on the surface of CuInS 2 network-like microspheres, and the content of CuInS 2 was optimized. The photocatalytic activity of optimal Z-scheme 15% CuInS 2 /Bi 2 WO 6 for the degradation of tetracycline hydrochloride (TC•HCl) is more than three times that of bare CuInS 2 and 17% higher than that of Bi 2 WO 6 , which is attributed that the intimate interface contact can assure excellent interfacial charge transfer abilities. Moreover, Z-scheme CuInS 2 /Bi 2 WO 6 heterojunctions are highly stable with no inactivation in photocatalytic cycles. More importantly, real pharmaceutical industry wastewater can be efficiently disposed by Fenton-aided photocatalysis of Z-scheme CuInS 2 /Bi 2 WO 6 heterojunctions with COD removal efficiency being 90.5%, which is much higher than the reported results, and thus sets a new performance benchmark for practical application in real pharmaceutical wastewater treatment.
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