JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Beibei Wang,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
We report an unique 2D/2D Iodine doped BiOIO 3 /g-C 3 N 4 heterojunction was successfully prepared. The iodine doped BiOIO 3 was prepared by a simple solvent exchange method and combined with g-C 3 N 4 by solvothermal method . The prepared photocatalyst has potential application value in the future due to its excellent stable cycle property. BiOIO 3 nanoplates and g-C 3 N 4 nanosheets form a close interfacial contact directly, so the catalyst has higher charge transport efficiency and wide visible range due to the introduction of iodide ions. Synergistic heterojunction exhibits strong photocatalytic activity for degradation of NO at ppb-level under visible light , of which 30% Iodine doped BiOIO 3 /g-C 3 N 4 can achieve a maximum removal rate of 57% for NO. According to the experimental results of ESR and other experiments, a more complex Z-scheme photocatalytic mechanism is proposed, which has stronger redox ability than the traditional mechanism.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Zhanbin Jin,Tingting Wei,Jiayu Huang,Fengyan Li,Yi Yang,Lin Xu
In this work, a novel direct Z-scheme g-C 3 N 5 /Zn 0.5 Cd 0.5 S (CN/ZCS) heterojunction was successfully synthesized. Furthermore, its photocatalytic activity for hydrogen production was also investigated, whose photoluminescence spectrum revealed the charge transfer procedure of g-C 3 N 5 and ZCS. Moreover, the optimized hydrogen production rate of ZCS with 15 wt% of g-C 3 N 5 (15% CN/ZCS) was about 142.8 mmol/h/g and quantum efficiency (Q.E.) was circa 33.7% under 420 nm monochromatic light. Compared with the pure ZCS and ZCS with 2 wt% of Pt, the 15% CN/ZCS composite exhibited considerable improved hydrogen production rate, which was about 20 times and 7 times, respectively. The formation of CN/ZCS composite resulted in faster separation of the photogenerated electron-hole pairs. Our work may supply valuable data for the application of g-C 3 N 5 on photocatalysis .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Tao Cai,Wengao Zeng,Yutang Liu,Longlu Wang,Wanyue Dong,Hui Chen,Xinnian Xia
Silver orthophosphate (Ag 3 PO 4 ) based semiconductor photocatalysis have been widely investigated for environmental purification due to its strong oxidation ability. Yet, its poor photostability and low photoactivity hamper its extensive applications. Here, an inorganic-organic Z-scheme photocatalytic system for antibiotic degradation demonstrated high photoactivity and stability through the use of Ag 3 PO 4 /Perylene diimide organic supermolecule (PDIsm). The apparent rate constant of tetracycline hydrochloride (TC-H) degradation with Ag 3 PO 4 /PDIsm was 1.5 times that of Ag 3 PO 4 and 8 times that of PDIsm. The photocatalytic activity of Ag 3 PO 4 /PDIsm toward TC-H still kept 65 % after four reuses, while pure Ag 3 PO 4 only kept 22 %. We revealed that this high photoactivity and photostability arisen from the efficient carriers separation and the formation of direct Z-scheme junction. Importantly, this Z-scheme electron transfer pathway was confirmed by thorough experimental study and density functional theory (DFT) calculation. This work demonstrated the significant potential of Ag 3 PO 4 -based inorganic-organic Z-scheme photocatalyst in environmental remediation.
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Science China-Chemistry
·
2019
·Vol. 63
·期 1
·28-34
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IF 6.085
Zhao Bohang,Huang Yi,Liu Dali,Yu Yifu,Zhang Bin
The development of a facile strategy to construct stable hierarchal porous heterogeneous photocatalysts remains a great challenge for efficient CO 2 reduction. Additionally, hole-trapping sacrificial agents (e.g., triethanolamine, triethylamine, and methanol) are mostly necessary, which produce useless chemicals, and thus cause costs/environmental concerns. Therefore, utilizing oxidation ability of holes to develop an alternative photooxidation reaction to produce value-added chemicals, especially coupled with CO 2 photoreduction, is highly desirable. Here, an in situ partial phosphating method of In 2 O 3 is reported for synthesizing InP–In 2 O 3 p-n junction. A highly selective photooxidation of tetrahydroisoquinoline (THIQ) into value-added dihydroisoquinoline (DHIQ) is to replace the hole driven oxidation of typical sacrificial agents. Meanwhile, the photoelectrons of InP–In 2 O 3 p-n junction can induce the efficient photoreduction of CO 2 to CO with high selectivity and stability. The evolution rates of DHIQ and CO are 2 and 3.8 times higher than those of the corresponding In 2 O 3 n-type precursor, respectively. In situ irradiated X-ray photoelectron spectroscopy and electron spin resonance are utilized to confirm that the direct Z-scheme mechanism of InP–In 2 O 3 p-n junction accelerate the efficient separation of photocarriers.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Shuguang Li,Zhiyu Liu,Zhihui Qu,Congcong Piao,Jize Liu,Duo Xu,Xiaojing Li,Jun Wang,Youtao Song
It is first reported that an all-solid-state Z-scheme NaNbO 3 -Au-Sn 3 O 4 nanocomposite photocatalyst can be prepared by ultrasonic dispersion and calcination methods. In NaNbO 3 -Au-Sn 3 O 4 , NaNbO 3 and Sn 3 O 4 form a Z-scheme photocatalytic system, Au as an electron transfer channel accelerates the flow rate of the photo-induced electrons. Their effective combination can not only improve the utilization ratio of sunlight but also achieve the effective segregation of photo-induced electron-hole pairs. The fabricated samples were characterized by XRD, Raman spectra, SEM, TEM, UV–vis DRS, XPS and PL. In addition, the activity of the NaNbO 3 -Au-Sn 3 O 4 photocatalyst was researched via the photocatalytic degradation of carbofuran in wastewater under sunlight irradiation. The sunlight illumination time, NaNbO 3 and Sn 3 O 4 mole ratio, cycle number and pesticides types as influence factors on the photocatalytic degradation efficiency of Z-scheme NaNbO 3 -Au-Sn 3 O 4 photocatalyst are investigated in detail. The possible mechanism and degradation pathways for the photocatalytic degradation of carbofuran caused by Z-scheme NaNbO 3 -Au-Sn 3 O 4 photocatalyst under sunlight irradiation are put forward. The research results show that the all-solid-state Z-scheme NaNbO 3 -Au-Sn 3 O 4 photocatalyst displays a wonderful activity for degradation of carbofuran in wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Baogang Fu,Nan Su,Yun Wang,Xiangtong Zhou,Yidong Hu,Hongjun Dong,Chunmei Li
In order to achieve the sustainable production of hydrogen fuel, the heterogeneous photocatalysts with inimitable structure are always desired for the high-efficiency and stable H 2 production reaction from water splitting owing to the perfect structure–activity relationship. In this study, a novel metal-free one-dimensional/two-dimensional (1D/2D) heterojunction is constructed by a series of dissolution and diffusion, recrystallization and in-situ growth, and self-assembly process of 1-pyrene carboxaldehyde (PCHO) nanoribbons on the surface of polymeric carbon nitride (PCN) nanosheets. The obtained 1D/2D heterojunction can realize fast carrier transport along 1D nanoribbons to prevent the recombination of photogenerated carriers at the interface. Furthermore, the intrinsic Z-scheme reaction mechanism within the heterostructure also effectively inhibits electron-hole recombination and isolates the reduction and oxidation sites of the photocatalytic reaction. As a result, the dramatically enhanced photocatalytic hydrogen evolution (PHE) activity is achieved over the 1%-PCHO/PCN sample, the optimal PHE rate of which is approximately 5.4 times that of pure PCN . This work provides the deep insight into the design and exploitation of metal-free heterojunction with unique structure applied in the photocatalytic energy conversion field.
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NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 40
·18659-18670
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IF 3.3
Zhentao Wang,Waheed Iqbal,Jingjing Wang,Ninghui Chang,Chuanguang Qin
Degrading dye waste using inexpensive synthetic photocatalysts is intriguing since it provides the dual advantage of treating water and managing waste simultaneously. There is considerable interest in the construction of heterojunctions for their efficiency in using solar energy for the degradation of wastewater contaminants and enhancing the solar conversion efficiency. Herein, BiVO4 microspheres and 2D g-C3N4 nanosheets were used to synthesize a direct Z-scheme BiVO4/g-C3N4 heterojunction through a hydrothermal calcination approach. The distinct 0D/2D intimate contact heterostructure displayed a high interfacial area and broader visible-light absorption range together with high photoexcited charge pair mobility. Optimizing the content of the BiVO4 microspheres in the heterostructure led to the maximum efficiency for the visible-light photodegradation of rhodamine B (RhB), which was about 12.5 and 2.4 times higher than that for pure BiVO4 and g-C3N4, respectively. Moreover, the quenching effects of various scavengers demonstrated that ˙O2− and ˙OH radicals were the principal active species responsible for ameliorating the photocatalytic performance for RhB degradation. The demonstrated strategy for boosting the photocatalytic performance with Z-scheme systems may help the advancement of high-performance photocatalysts for sustainable and efficient pollutant degradation and energy applications.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Qiang Fu,Yue Meng,Yiyang Yao,Hui Shen,Bo Xie,Zheming Ni,Shengjie Xia
A synergistic strategy of Facet engineering and the construction of Z-scheme heterojunctions is expected to improve internal consumption and insufficient carriers in photocatalysis significantly. In this paper, Fe 2 O 3 nanoparticles were selectively grown on the (110) facet of BiVO 4 , and facet orientation-supported Z-scheme heterojunction of BiVO 4 (110)-Fe 2 O 3 was constructed for the photocatalytic degradation of tetracycline . The effects of catalyst dosage, pH, temperature, and other conditions on the degradation performance were systematically investigated and found to have excellent catalytic activity , structural stability, and reusability. The removal of TC (15 mg·L −1 ) under 60 min visible light irradiation were 57.7%, 81.7%, and 91.5% for single-phase catalyst, non-directionally loaded BiVO 4 -Fe 2 O 3 and directionally loaded BiVO 4 (110)-Fe 2 O 3 Z-scheme heterojunction (0.3 g·L −1 ), respectively. Combining photoelectric testing and DFT calculation, it was confirmed that the presence of the built-in electric field from BiVO 4 (110) pointing to Fe 2 O 3 (110) in BiVO 4 (110)-Fe 2 O 3 Z-scheme heterojunction facilitates the separation and transfer of photogenerated carriers and significantly improves the photodegradation performance of the material. In addition, the intermediates and degradation pathways were investigated in detail.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Lufang Fan,Sheng Feng,Kai Wei,Xiaojun Dai,Weijie Zhang,Haihong Wang,Zhaowei Bian,Kaidi Wu,Zhiwen Ge,Jinghao Hua
In this study, we designed and fabricated a Z-scheme Cu 0.5 Cd 0.5 S/MoO 3-x (CMO) heterojunction with localized surface plasmon resonance (LSPR) effect for efficient photocatalytic hydrogen evolution. The oxygen vacancies (OVs) in MoO 3-x induced Schottky-barrier-free LSPR for the generation of hot electrons. The architecture of transition-metal-substituted solid solution (Cu 0.5 Cd 0.5 S, CCS) downshifted the conduction band (CB) of CdS from −0.45 eV to −0.38 eV and upshifted the valence band (VB) from 1.65 eV to 1.54 eV, respectively, weakening the interface barrier of the hot electrons transition from MoO 3-x to CCS and enhancing the Coulomb interaction between the electrons of MoO 3-x and the holes of CCS. Benefiting from the cooperation between Z-scheme heterojunction and LSPR effect, the hydrogen evolution rate (HER) of the optimized CMO was 19.28 mmol·g −1 ·h −1 under visible light with an apparent quantum yield (AQY) of 10.8 % at 420 nm, which was 3.0 and 1.4 times that of the CCS and CCS/MoO 3 . Moreover, the HER of CMO still reached 43.57 μmol·g −1 ·h −1 at 600 nm. This work paved a new path for efficient photocatalysts H 2 evolution by coupling Z-scheme heterojunction and non-noble-metal LSPR effect.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yangjie Fu,Yanjie Mao,Longyang Wang,Mengyi Qiu,Youran Xu,Jianying Qian,Men Tan,Kejie Zhang,Derek Hao,Qi Wang,Guoxiang Yang
Proper design and successful synthesis of photocatalysts with efficient interfacial charge transfer, strong redox capabilities, and strong environmental applications are critical. Herein, a novel Z-scheme heterojunction AgI/Ce-2MI nanocomposite with redox-retaining properties was successfully prepared by a simple precipitation method. Compared with AgI and Ce-2MI, the efficiency of the optimized Z-scheme AgI/Ce-2MI composites in photocatalytic reduction of Cr(VI) in water within 75 min could exceed 90%. The reduction rate of AgI/Ce-2MI to Cr(VI) was 0.0277 min −1 , which was 2.6 times and 6.8 times that of AgI and Ce-2MI, respectively. In addition, the cycle performance of AgI/Ce-2MI under different pH conditions was compared, and it was found that under the condition of pH= 2, its five-time catalytic activity stability showed good performance. Moreover, the enhancement process of reactive oxygen species •O 2 - and •OH were further verified by active radical capture experiment and ESR. Therefore, this study can provide a Z-scheme heterojunction nanocomposite photocatalytic process with environmental purification functions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Pengfei Zhu,Shasha Zhang,Mei Liu,Ming Duan,Zhaoxin Huang,Han Lu
Herein, a novel Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 double Z-scheme heterojunction photocatalytic material was synthesized by the ultrasonic-assisted coprecipitation method. When the content of AgBr in Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 is 30 wt% and the content of Ag 4 V 2 O 7 is 1 wt%, under the optimized reaction conditions, the degradation rate of Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 to oxytetracycline (OTC) reached 88.13 % within 60 min, and the photocatalytic activity decreased only slightly after repeated use for three times, other than that, the toxicity of OTC to wheat decreased significantly after degradation. The morphology, composition, crystal structure and visible light absorption capacity of the samples are investigated by a series of characterization techniques. Furthermore, free radical capture experiment, electron paramagnetic resonance (EPR) experiment and liquid chromatography-mass spectrometry (LC-MS) were used to explore the possible photocatalytic mechanism and degradation path of OTC. The results show that the improvement of photocatalytic activity is attributed to the construction of a double Z-scheme heterojunction, which provides a more effective structural space for the separation of photogenerated e - -h + pairs. This study provides a new idea for the separation of photogenerated e - -h + pairs and broadens the response range of visible light, and proposes a new strategy for the environmental treatment of photocatalysts.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Dan Li,Xiangshan Lei,Qingdong Liu,Yajun Chen,Jiao Wang,Bingyan Han,Gaohong He
Copper nanoclusters (CuNCs), as novel energy level tunable photocatalysts, have been utilized to combine with various conventional inorganic catalysts to improve catalytic performance. However, conventional photocatalysts generally have fixed energy levels, which are not conducive to bi-directional adjustment of the composite catalyst energy level structure. In this work, CuNCs protected by 3-mercaptopropionic acid (CuNCs@3-MPA) and energy-level controllable carbon dots (CDs) are combined to prepare intelligent photocatalytic materials through electrostatic self-assembly strategy, i.e., CuNCs@3-MPA/CDs. The self-assembled CuNCs@3-MPA have a large specific surface area, and the Z-type heterostructure can be constructed by introducing energy-matched CDs, which can achieve the effective separation of photogenerated electron-hole pairs and directional generation of ·O 2 − at the same time, enabling the degradation of 98.5 % Methyl Orange (MO, 20 mg/L) in 7 min. The catalytic rate constant is increased to 0.501 min −1 , which is equivalent to 3.6 times that of CuNCs@3-MPA alone. Since CuNCs@3-MPA/CDs with rich Cu(I) can perform Fenton-like reaction to catalyze the production of ·OH from H 2 O 2 , we use TMB and H 2 O 2 as substrates to probe its peroxidase-like activity. The K m is 0.18 mM when the substrate is TMB, which is lower than that of horseradish peroxidase (HRP) ( K m = 0.434 mM), indicating that the affinity between CuNCs@3-MPA/CDs and TMB is higher than that of HRP, which has a high peroxidase-like activity.
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