CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Guoqiang Zhang,Zhiqi Wang,Tao He,Jingli Wu,Jinzhi Zhang,Jinhu Wu
Exploring efficient and robust CO 2 photoreduction and water splitting photocatalysts are critical for closing the anthropogenic carbon cycle and developing H 2 energy source. Herein, ultrasmall pomegranate-like Z-scheme CdIn 2 S 4 /ZnIn 2 S 4 heterojunctions with abundant vacancies were rationally designed and in-situ constructed though L-cysteine assisted solvothermal method with precipitation conversion strategy. The obtained CdIn 2 S 4 /ZnIn 2 S 4 -3 photocatalyst displays the highest performance in the photocatalytic conversion of CO 2 and H 2 O into CO and H 2 with yields of 1194.5 and 475.7 μmolg −1 h −1 , respectively, which increase respectively by 62.2% and 123.1% compared to CdIn 2 S 4 under the visible light irradiation. In addition, CdIn 2 S 4 /ZnIn 2 S 4 -4 hybrid exhibits excellent stability and activity during the 23-hour continuous HER, the average yield of H 2 in 23-hour is up to 10286.6 μmolg −1 h −1 . This study provides a practical method for in-situ fabrication of ultrasmall pomegranate-like Z-scheme nano-heterostructures with abundant vacancies, which are valuable for efficient and robust implementation in a wide range of environmental and energy applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Yanning Qu,Xinyang Li,Hengli Zhang,Renliang Huang,Wei Qi,Rongxin Su,Zhimin He
Multifunctional photocatalytic surfaces for pollutant degradation and antimicrobial application are often in high demand, however they confront many challenges in charge transfer and light capture ability. In this work, a sponge-like N,S-CQDs/Bi 2 MoO 6 @TiO 2 film was constructed via hydrothermal technique aiming to solve above problems. As a result, the ternary film showed enhanced photocatalytic efficiency under visible and near-infrared (NIR) light, in which 85.8% and 44.6% of ciprofloxacin (CIP) were degraded after 240 min irradiation with visible and NIR light, respectively. Moreover, the composite film effectively realized photocatalytic sterilization of gram-positive B. subtilis and gram-negative E. coli under visible light irradiation. The bacterial colony decreased significantly from 7.56-log to 1-log cfu/mL after adding the ternary film within 1.5 h. The enhanced photocatalytic efficiency was closely related to both introduction of surface-functional N,S-CQDs and the construction of N,S-CQDs/Bi 2 MoO 6 @TiO 2 Z-scheme system, in which the transfer efficiency of photoinduced carriers and the light absorption property were significantly improved. We consider that the N,S-CQDs/Bi 2 MoO 6 @TiO 2 film is promising for the degradation of refractory pollutants and antimicrobial application under visible/NIR light irradiation. The relatively convenient recycling property and excellent photocatalytic performance of the N,S-CQDs/Bi 2 MoO 6 @TiO 2 film are beneficial for industrial applications.
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DIAMOND AND RELATED MATERIALS
·
2021
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IF 3.315
Rui Zhang,Kunlin Zeng
Preparation of Z-scheme composite photocatalyst to degrade organic matter in water is the most popular research trend. However, due to the strict requirements of band edge energy level arrangement and interface contact, it is a great challenge to explore suitable photocatalytic materials to form Z-scheme photocatalytic system. In our work, a novel visible light driven double Z-scheme photocatalyst BiSI/Bi 2 WO 6 /g-C 3 N 4 was successfully prepared by hydrothermal synthesis . The physicochemical properties of the materials were characterized by XRD , XPS, SEM, BET, UV–vis, PL , EIS and LC-MS. The photocatalytic degradation of tetracycline (TC), chlortetracycline (CTC) and rhodamine B (RhB) showed that BiSI/Bi 2 WO 6 /(20%) g-C 3 N 4 had the best photocatalytic activity . The results free radical trap experiments demonstrate that h + and O 2 − are the main free radicals in the photocatalytic process. Because of the heterojunction formed between BiSI, Bi 2 WO 6 and g-C 3 N 4 , the electron conduction was accelerated, the photogenerated electrons and holes were separated effectively, and the photocatalytic performance of the composite was improved. Additionally, cycle test showed that BiSI/Bi 2 WO 6 /g-C 3 N 4 hybrid material had stable degradation ability in the process of photodegradation . This unique heterojunction photocatalysis material has broad application prospects in the removal of organic pollutants and environmental treatment.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Weiwen Wang,Hui Zhao,Peng Pan,Kang Xue,Zisheng Zhang,Jihai Duan
In order to enhance the photocatalytic activity of TiO 2 under visible light, Ag nanoparticles were introduced into tridoped B–C–N–TiO 2 (TT) catalyst by photoreduction deposition. Ag/B–C–N–TiO 2 (ATT) catalysts with the functions of reducing band gap and carrier recombination were prepared. At the same time, the effect of the amount of Ag on the photocatalytic performance of ATT catalyst was investigated. Through XRD , XPS , PL and other characterization methods, the (211)/(101)/Ag interface heterojunction mechanism similar to the traditional Z-scheme heterojunction was proposed. The intervention of Ag nanoparticles changed the P–N interface heterojunction between (211)/(101) to the (211)/(101)/Ag Z-scheme interface heterojunction. The results show that ATT catalyst exhibits the highest photocatalytic activity when the molar amount of Ag is 0.005% with the MB degradation rate of the ATT catalyst (0.01707 min −1 ), which is 14.59 times of TiO 2 (0.00117 min −1 ) and 2.02 times of TT (0.00847 min −1 ). In addition, the four cycles efficiencies of ATT for MB degradation were all above 94.00%.This study reveals the possibility of construction of Z-scheme heterojunctions between precious metal nanoparticles and different interfaces of TiO 2 , and provides a reference for the construction of Z-scheme interface heterojunctions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Jie Yue,Meng Yuan,Xuan Zhang,Guochang Wen,Guina Ren,Bo Ge,Limin Zhao,Xin Shao
Due to its porous structure, hydrophobic modified three dimensional melamine sponge (MS) was commonly used for high efficiency oil/water separation. Nevertheless, it does nothing to water-soluble pollutants. In order to deal with residual pollutants, the direct Z-scheme BiOI/CdS composites was constructed and loaded onto the melamine sponge which easily achieved efficient degradation and selective deoiling. Furthermore, traditional hydrophobic methods (such as grafting mercaptan, silanes and so on) had several drawbacks, hence a novel metal organic frame material ZIF-8 was adopted in order to attain the purpose of superhydrophobic . In this work, it has shown that the cyclic photodegradation efficiency of superhydrophobic BiOI/CdS/ZIF-8 melamine sponge (BCZ MS) could still achieve 92% after performing 4 cycles of degradation and the results indicated that BCZ MS has preeminent stability. Besides, it was verified by the capture experiment that the main active species was O 2 − .
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Runren Jiang,Guanghua Lu,Matthew Nkoom,Zhenhua Yan,Donghai Wu,Jianchao Liu,Tianjian Dang
Developing excellent photocatalysts to mineralize pollutants and reduce toxicity is an urgent problem in current environment purification research. Here, we synthesized a novel 2D/2D Cu 2 WS 4 /BiOCl Z-scheme system by a facile solvent mixing method and characterized the samples by various analytical methods. Compared with 3D/2D, the close contact surface of the 2D/2D catalyst endows it with extremely fast charge transfer and a large number of active sites, a Z-scheme system process strong electronic interaction and efficient charge separation, resulting in the high photocatalytic performance of the 2D/2D Cu 2 WS 4 /BiOCl Z-scheme system. As expected, The 15% 2D/2D Z-scheme Cu 2 WS 4 /BiOCl possessed the highest rate constant 1.14 × 10 −1 min −1 in the degradation of benzophenone-1 (BP1), which are 8, 5 and 4 times greater than that of BiOCl (1.36 × 10 −2 min −1 ), Cu 2 WS 4 (2.27 × 10 −2 min −1 ) and 15% 3D/2D Cu 2 WS 4 /BiOCl (2.6 × 10 −2 min −1 ), respectively. Meanwhile, the practicability of Cu 2 WS 4 /BiOCl was studied by the influence of relevant real water matrix on photocatalytic degradation of BP1. In addition, the result of density functional theory calculations demonstrated that the 2D/2D Cu 2 WS 4 /BiOCl system has faster charge transferability and closer integration than that of the 3D/2D system, which further confirms that the close 2D interface is conducive to charge transfer at the interface. Nine potential degradation products were identified as intermediates, and extremely significant toxicity reduction during the degradation process was confirmed by an ECOSAR prediction and zebrafish acute toxicity test . Compared with gene expression, the hatching rate and survival rate of zebrafish embryo are more sensitive and considered to be better choices for toxicity assessment.
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JOURNAL OF CRYSTAL GROWTH
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2013
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IF 1.552
Y.F. Zhang,L. Huang,Y.B. Sun,B. Han,H.S. Cheng
In this work, we reported on the synthesis and characterization of (Z)-4-oxo-4-ureido-but-2-enoic acid and p-toluenesulfonic acid 3-nitrophenyl ester and their detailed crystal structure information were studied. The crystallization of (Z)-4-oxo-4-ureido-but-2-enoic acid results in reduced π -conjugation in the molecule and weaker intra-molecular hydrogen bonding. The main driving force for the molecular self-assembly of (Z)-4-oxo-4-ureido-but-2-enoic acid was found to be the strong intermolecular hydrogen bonds . Compared with (Z)-4-oxo-4-ureido-but-2-enoic acid with six type of strong H-bonds, p-toluenesulfonic acid 3-nitrophenyl ester possesses much lower melting point (110–111°C), average packing energy (−3.7 kcal mol −1 ), molecular deformation energy (−0.6 kcal mol −1 ) and highest torsional angle change (9.3°). This can be ascribed to the week intermolecular interaction between center molecule and adjacent molecules.
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RSC Advances
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2017
·Vol. 7
·期 54
·34096-34103
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IF 3.108
Yuehan Su,Ping Chen,Fengliang Wang,Qianxin Zhang,Tiansheng Chen,Yingfei Wang,Kun Yao,Wenying Lv,Guoguang Liu
A novel visible-light-driven carbon dot (CDs)/TiO2/g-C3N4 photocatalyst was successfully synthesized by doping CDs in TiO2 nanoparticles and the surface of g-C3N4 nanosheets via a facile hydrothermal process and was confirmed by characterization methods. UV-vis diffuse reflectance spectra (DRS) revealed that CDs/TiO2/g-C3N4 showed obvious additional absorption in the 370–450 nm region. DMPO spin-trapping ESR spectra demonstrated the existence of O2˙− and ·OH. The photocatalytic activity of the CDs (1.0 wt%)/TiO2/g-C3N4 was remarkably enhanced as compared to that of the single components (TiO2 and g-C3N4) and double component (TiO2/g-C3N4) towards the degradation of enrofloxacin (ENX) under visible-light irradiation. About 91.6% of ENX was decomposed by CDs (1.0 wt%)/TiO2/g-C3N4 in 1 h, which is nearly 3.95 times, 4.82 times, and 1.69 times that for TiO2, g-C3N4, and TiO2 (90.0 wt%)/g-C3N4, respectively. Scavenging experiments revealed that O2˙− and ·OH played key roles during the photocatalytic degradation of ENX. This study provides a simple and convenient method to modify materials with enhanced photocatalytic performance, and the CDs/TiO2/g-C3N4 catalyst is efficient, stable, and reusable for environmental practical applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Shihai Cao,Ning Zhou,Fenghua Gao,Huan Chen,Fang Jiang
An all-solid-state Z-scheme heterojunction-structured photocatalyst, 3,4-dihydroxybenzaldehyde-functionalized Ga 2 O 3 /graphitic carbon nitride (Ga 2 O 3 -DBD/g-C 3 N 4 ), was synthesized using a facile post-grafting strategy via Schiff base chemistry. It was proposed for the first time that aromatic rings served as electron mediators in the Z-scheme photocatalytic system. In addition, the aromatic rings were conducive to the formation of a well-developed combined interface between Ga 2 O 3 -DBD and g-C 3 N 4 , greatly improving the separation of electrons and holes. The Ga 2 O 3 -DBD/g-C 3 N 4 exhibited a wide absorption range, high charge-separation efficiency and high redox potential, thus enhancing its activity and stability for visible-light photocatalytic nitrogen fixation. The reaction mechanism was demonstrated to be that O 2 was first reduced to H 2 O 2 , which was further oxidized to OH; then, OH reacted with methanol to form CO 2 − , which facilitated the reduction of N 2 to NH 3 . This study demonstrates a simple and cost-effective approach to synthesize all-solid-state Z-scheme photocatalytic system using the aromatic rings, and this system exhibits great potential for practical applications of visible-light photocatalytic nitrogen fixation.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Muhammad Khalid Hussain,N.R. Khalid,Muhammad Tanveer,Amir Abbas,Furqan Ali,Warda Hassan,Martha Rianna,Sultana Rahman,Muhammad Hamza,Muhammad Aslam
x ZnO- (1-x) MoO 3 (x = 0.0,0.1,0.3,0.5,0.7) nanocomposite materials have been efficiently fabricated by the facile hydrothermal method to enhance the photocatalytic activities for the environmental applications. The fabricated samples were characterized via XRD , SEM, EDX , XPS, UV–Visible spectroscopy, PL and FTIR analysis. The 5% ZnO-M nanocomposite material exhibits reduced band gab energy and superior photocatalytic activity for rhodamine B (RhB) and alizarin yellow (AY) dyes degradation of 94% and 81% within 120 min under visible light irradiance. Our reported study reveals that the 5% ZnO-M photocatalyst is extremely stable and reusable for more than five reaction of cycles. The photocatalytic enactment of the 5% ZnO-M composite was mostly endorsed due to Z-scheme photocatalysts, higher visible light adsorption on the surface morphology , improved charge separation/transfer, and decreased recombination rate. This study may provide new ideas for developing effective, innovative Z-scheme heterojunction photocatalysts and encouraging their extensive application for the degradation of dyes from wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Wenqi Liu,Jingyan Zhang,Mei Dong,Zhaoyi Ding,Qunfei Wang,Fanghao Ning,Qin He,Yanyan Chen,Zhen Zhao,Zhongfu Li,Conghua Liu
Low-silica chabazite (CHA) catalysts with varying configurations of Cu 2+ -2Z and [Cu(OH)] + -Z active centers are developed through the regulation of the opening of CHA-cages. The catalysts are subsequently applied to the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reactions. A series of characterizations and performance evaluations indicate that the density of [Cu(OH)] + -Z in eight-member rings (8MRs) is positively correlated with low-temperature performance. Moreover, the presence of partial Cu 2+ -2Z in six-member rings (6MRs) enhances activity and tolerance at high temperatures. The residual K + ions in the CHA-cages after NH 4 + exchange are retained in the 6MRs. Density functional theory calculations demonstrate that the residual K + ions stabilize the 6MRs structure, ensuring the entry and stable presence of the active Cu 2+ -2Z centers. In situ analysis reveals the reaction intermediates involved in the NH 3 -SCR process on representative catalysts. These findings can further elucidate the active centers of CHA-type catalysts and guide the design of commercial catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Xintao Feng,Shihan Zhou,Jiaxing Liu,Jingbo Wu,Jundi Wang,Wenli Zhang,Yinhua Jiang,Yan Liu,Jianming Zhang,Xiaoqing Lu
Crafting an inorganic semiconductor heterojunction with defect engineering and morphology modulation is a strategic approach to produce clean energy by the highly efficient light-driven splitting of water. In this paper, a novel Z-scheme sulfur-vacancy containing Zn 3 In 2 S 6 (Vs-Zn 3 In 2 S 6 ) nanosheets/In 2 O 3 hollow hexagonal prisms heterostructrue (Vs-ZIS6INO) was firstly constructed by an oil bath method, in which Vs-Zn 3 In 2 S 6 nanosheets grew on the surfaces of In 2 O 3 hollow hexagonal prisms to form a hollow core–shell structure. The obtained Vs-ZIS6INO heterostructrue exhibited much enhanced activity of the production of H 2 and H 2 O 2 by the light-driven water splitting. In particular, under visible light irradiation (λ > 420 nm), the rate of generation of H 2 of Vs-ZIS6INO sample containing 30 wt% Vs-Zn 3 In 2 S 6 (30Vs-ZIS6INO) could reach 3721 μmol g –1 h −1 , which was 87 and 6 times higher than those of Zn 3 In 2 S 6 (43 μmol g –1 h −1 ) and Vs-Zn 3 In 2 S 6 (586 μmol g –1 h −1 ), respectively. Meanwhile, 30Vs-ZIS6INO could exhibit the rate of H 2 O 2 production of 483 μmol g –1 h −1 through the dual pathways of indirect 2e – oxygen reduction (ORR) and water oxidation (WOR) without adding any sacrifice agents, far exceeding In 2 O 3 (7 μmol g –1 h −1 ) and Vs-Zn 3 In 2 S 6 (58 μmol g –1 h −1 ). The excellent photocatalytic activities of H 2 and H 2 O 2 generations of Vs-ZIS6INO sample might result from the synergistic effect of the sulfur vacancy , hollow core–shell structure, and Z-scheme heterostructure, which accelerated the electron delocalization , enhanced the absorption and conversion of solar energy, reduced the carrier diffusion distance, and ensured high REDOX ability. In addition, the possible photocatalytic mechanisms for the production of H 2 and H 2 O 2 were discussed in detail. This study provided a new idea and reference for constructing the novel and efficient inorganic semiconductor heterostructures by coordinating vacancy defect and morphology design to adequately utilize water splitting for the production of clean energy.
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