SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Tianliang Xia,Qidong Hou,Hengli Qian,Ruite Lai,Xinyu Bai,Guanjie Yu,Weijie Zhang,Mian Laiq Ur Rehman,Meiting Ju
Photocatalytic technology has been increasing explored for the elimination of pollutants from aquatic environments. However, constructing powerful photocatalyst to drive rapid decontamination remains challenging. Here, we assemble boron-doped nitrogen-deficient carbon nitride (BNCN) into metal-free Z-scheme heterojunction via a facile approach to boost photocatalytic degradation of acetaminophen. Incorporating boron dopants and nitrogen defects to C 3 N 4 significantly increase the photoabsorption. Furthermore, the constructed heterojunction exhibited decreased band gap and remarkably enhanced separation efficiency of photogenerated carriers compared with individual BNCN. Owing to the modulation of band structures and the better separation of photogenerated carriers, acetaminophen conversion approaching 100 % was achieved in just 30 mins under simulated sunlight, outperforming equivalent quantities of bulk carbon nitride and commercial TiO 2 by 3.1 and 2.7 times, respectively. Two possible photodegradation pathways were proposed with hydroxylation and ring-opening reactions as dominant degradation reactions. Our findings provide an instructive catalyst design strategy to boost photocatalytic degradation efficiency.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
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IF 4.5
Dong Liu,Qingfa Gong,Xixi Xu,Shuyun Meng,Yuye Li,Tianyan You
Photoelectrochemical (PEC) aptasensing has been extensively studied for hazardous material (e.g., pesticide residue) detection, with investigation on photoactive materials being their main focus of study. Herein, a cascade Z-scheme [email protected] 2 ( [email protected] 2 ) heterostructure was designed to fabricate a PEC aptasensor for carbendazim (CBZ) detection in tomato. The [email protected] 2 heterostructure was prepared by taking advantage of electrostatic adsorption between components. The cascade Z-scheme electron transfer was verified in [email protected] 2 , resulting in a significantly enlarged photocurrent (e.g., 2.7-fold higher of that at CdTe/MoS 2 ) for the efficient separation of electron-hole pair. The PEC aptasensor was developed based on the principle that the specific binding of aptamer to target on the surface of [email protected] 2 increased the steric hindrance for electron transfer, facilitating a “signal-off” detection mode for CBZ. The fabricated aptasensor offered a linear range of 0.523–5230 nM (0.1–100 ng mL −1 ) with a detection limit of 1.74 × 10 -10 M (0.033 ng mL −1 ) for CBZ detection, and it was successfully applied to tomato sample analysis. This work will stimulate exploration of cascade Z-scheme materials for sensing, and provides a high-performance PEC sensing platform for the detection of various species.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Sheng-Zhe Zhao,Ran Lu,Yi Yang,Yun Lu,Raul D. Rodriguez,Jin-Ju Chen
Photocatalysis has a broad prospect for generating H 2 and reactive oxygen species . In this study, porous nanotubular g-C 3 N 4 /TiO 2 photocatalysts were obtained via electrospinning combined with an innovative vapor deposition approach. The waste foam was used as the precursor material for TiO 2 nanotubes , reducing production cost and benefiting resource recovery. The modification of g-C 3 N 4 onto TiO 2 nanotubes provided extensive active sites with an increased specific surface area and produced the heterojunction to improve charge separation. The g-C 3 N 4 /TiO 2 nanotubes displayed remarkable photocatalytic effects in the degradation of organic dye with a removal efficiency of 93.4% and H 2 evolution reaction performing at 4122 μmol·g −1 ·h −1 under simulated sunlight. Photocatalytic activation product analyses and density functional theory (DFT) calculations demonstrated a possible photogenerated carriers transfer pathway. This work provides a way to prepare multifunctional porous nanotubes using a facile synthesis method from abandoned resources with implications for environmental remediation and hydrogen generation.
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NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 8
·3745-3757
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IF 3.3
Litao Jia,Pei Yu,Ying Dong,Yonglei Xing,Juan Peng,Gang Ni,Xiaoyong Jin
The decomposition efficiency of refractory organic pollutants depends strongly on the characteristics of the photoanode semiconductors in the photoelectrocatalytic (PEC) process. The selection of superior materials with excellent PEC efficiency is a challenge in the practical application of PEC oxidation technology. Herein, a novel S-Co3O4/Bi2WO6 heterojunction photoanode was fabricated using a simple hydrothermal procedure. Compared with Bi2WO6 nanoflowers, the as-prepared S-Co3O4/Bi2WO6 photoanode had a large electroactive surface area, low charge transfer resistance, strong light absorption ability, and high separation efficiency for induced photogenerated electron/hole pairs (e−/h+). This relies on the fact that S doping not only controls the morphology of Co3O4 but also changes its intrinsic electronic structure to improve the interlayer polarization. Notably, the Z-scheme heterojunction formed by the combination of S-Co3O4 and Bi2WO6 not only enhances the e−/h+ separation efficiency but also results in a stronger redox ability than that of pure Bi2WO6. In addition, reactive species trapping experiments and electron spin resonance tests demonstrated that the S-Co3O4/Bi2WO6 photoanode plays a dominant role in the degradation of tetracycline (TC) by ˙O2− and ˙OH radicals. Therefore, the prepared S-Co3O4/Bi2WO6 photoanode exhibits better PEC performance than Co3O4, S-Co3O4 and Bi2WO6 in the degradation of TC. The optimized S-Co3O4/Bi2WO6 composite showed a degradation rate of 87.4% in 30 mg L−1 TC solution. This work provides a new strategy for the construction of efficient photoelectroanodes.
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APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Jie Cui,Lin Ye,Xiaoxi Chen,Jianing Li,Bian Yang,Man Yang,Qing Yang,Daqin Yun,Shaodong Sun
Exploring novel materials with both high adsorption capacity and photocatalytic properties is urgent in environmental remediation. In this work, a Z-scheme ZnO/Cu 2 O heterostructure with a large surface area of 45.42 m 2 /g was constructed by using the liquid phase reduction method. Compared to pure ZnO and pure Cu 2 O, the as-synthesized ZnO/Cu 2 O nanocomposites exhibited excellent capacity of adsorption and photodegradation for tetracycline (TC), which was degraded 95.3% of TC within 120 min under simultaneous adsorption and photocatalytic processes. Theory and experimental analysis manifested that the excellent adsorption-photocatalytic activity can be attributed to the large BET specific surface area, the efficient charge carrier separation and the high redox capability. The results of this study identified the potential advantages of ZnO/Cu 2 O composites for removing antibiotics to purify water resources and protect the environment.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
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IF 6.1
Feihu Zhang,Xinyan Xiao,Yu Xiao,Xia Cheng
An innovative 3D flower-like BiOI/Bi 3 O 4 Br hierarchical heterostructures complex material was firstly constructed via in-situ growth of ultrathin BiOI on Bi 3 O 4 Br by a simple precipitation method. Under the simulated solar-light illumination for 90 min, the optimal 60% BiOI/Bi 3 O 4 Br composite displayed the highest photodegradation rate of 96.4% for RhB, 80.0% for TC and 77.2% for MO. The corresponding apparent rate constants were 0.0314, 0.0167 and 0.0110 min −1 , which were 8.26, 1.82 and 3.24-times than that of Bi 3 O 4 Br, 44.86, 11.13 and 2.62-times than that of BiOI. The improved photodegradation activity could be owing to the following reasons: 1) The 3D hierarchical heterostructures endowed BiOI/Bi 3 O 4 Br with tight interfacial contact, which can supply sufficient migration channels for photoinduced carriers; 2) The Z-scheme charge migrate pathway promoted the segregation of photocarriers while maintaining a robust redox ability; 3) The BiOI/Bi 3 O 4 Br heterostructures reinforced light absorption edges more than 600 nm and augmented specific surface areas over 60 m 2 ·g −1 . In addition, the various photocatalytic conditions were studied to imitate the degradation process of RhB in the real aqueous system. The radical capture experiments and EPR test attested that h + and O 2 − played an important part in the photodegradation of RhB.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Shiming Zhang,Yiyuan Rong,Jingwen Wei,Zhihong Li,Ting Liang,Zebin Yu,Hongxiang Zhu,Shuangfei Wang,Yanping Hou
Fabrication of efficient photocatalysts with great visible light utilization ability, rapid carriers’ separation, and suitable redox potential is essential for improving photocatalytic CO 2 reduction. Herein, flower-like microspheres Bi 2 Sn 2 O 7 /NiAl-layered double hydroxide (BSO/LDH) heterojunctions were prepared by hydrothermal process for CO 2 reduction. The Bi 2 Sn 2 O 7 nanoparticles were dispersed on NiAl-LDH nanosheets, with tight contact interface, which facilitated charges transfer and exposing more catalytic active sites. Results of photochemical deposition of metal/metal oxide demonstrated that interfacial charges transfer of the BSO/LDH followed Z-scheme mechanism, endowing more desired redox potential and more efficient carriers separation. The 30%-BSO/LDH showed the highest CO and CH 4 yields of 37.91 and 1.18 μmol g −1 h −1 under visible light irradiation, 3.4 and 2.0 times higher than those from the NiAl-LDH, respectively. The main intermediates during CO 2 reduction were carboxylate (COOH*) and aldehyde group (CHO*), and CO 2 reduction pathways and mechanism were proposed accordingly. This study provided referential strategy for designing efficient heterojunction photocatalysts for CO 2 conversion.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Bihan Sun,Houfen Li,Qian Wei,Shuai Xue,Aijuan Zhou,Xiuping Yue
Quinoline is a kind of organic pollutant difficult to be biodegraded, for which the photocatalysis technology is a commonly used removal method, but the degradation performance still needs to be improved. In this work, the WO 3 -CuFe 2 O 4 Z-scheme system was constructed, and the persulfate (PS)-assisted photocatalytic degradation of quinoline with WO 3 -CuFe 2 O 4 by adding persulfate in the photocatalytic systems was studied. The effects of different systems and key parameters such as catalyst dosage, PS concentration and initial pH value on the degradation efficiency of quinoline were investigated. With the addition of persulfate, the degradation efficiency of quinoline increased from 24.3% to 100% in 150 min, under the condition of [PS] = 3 mmol/L, [catalyst] = 3 g/L, temperature = 25 ± 2 °C, and pH = 9. And the WO 3 -CuFe 2 O 4 catalyst showed excellent reusability according to the result of 5-cycle repeated experiment. The possible degradation mechanism was studied by the quenching test and the identification of intermediates and products, which indicated the degradation of quinoline in WO 3 -CuFe 2 O 4 /VIS/PS system was realized via denitrification, dehydrogenation, hydroxylation and ring breaking processes.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
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IF 7.926
Haoran Leng,Zhiying Lv,Haili Tan,Yuhong Jia,Hong You
As a representative pollutant with carcinogenesis, mutagenicity and teratogenicity , nitrobenzene (NB) has devastating harm to human health. Herein, a unique three-dimensional (3D) stack Z-scheme photoelectrocatalytic (PEC) system was built by self-assembled different photoelectrodes for efficient NB removal. The effect of initial NB, bias potential, pH and electrolyte concentration on NB removal efficiency were investigated. The intermediates and oxygen-active radicals were determined and analyzed by high performance liquid chromatography (HPLC), gas chromatography-mass spectrometry (GC-MS), density functional theory (DFT) and electron paramagnetic resonance (EPR) to propose the NB degradation pathways and mechanism. The results showed that holes were utilized to produce ·OH to oxidize NB on the photoanode surface, the electrons excited from photocathode could reduce NB under UV irradiation; thereafter, the reduction product (aniline) was oxidized to phenol to achieve mineralization by the synergistic effect of anode (oxidation) and cathode (reduction). 3D stack Z-scheme PEC system exhibited a high NB degradation efficiency of 98.18% after 90 min reaction and a mineralization efficiency of 75.08% at 150 min. With ECOSAR software, the system toxicity was speculated. This study has advantages in NB removal and provides direction for other refractory organics.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Chengyuan Yang,Jing Wang,Rong Wang,Wenxin Zhu,Liang Zhang,Ting Du,Jing Sun,Ming-Qiang Zhu,Yizhong Shen,Jianlong Wang
Multi-pollutants environment coexisted organic and inorganic pollutants has become a common phenomenon, seriously affecting water biodiversity and human water security. Currently, the removal of organic and inorganic pollutants by photocatalysis are mostly in own single-pollutant environment, not in multi-pollutants system, where the common photocatalysts cannot achieve efficiently charge separate and transfer with low reactive oxygen species (ROS) efficiency. Herein, we constructed an efficient cascaded Z-scheme heterojunction Co 9 S 8 @defective ZnS/g-C 3 N 4 (C@DZ/N) composed of defective engineering in hollow nanocubes, which achieved excellent photodegradation activity (98.93 % for ciprofloxacin (CIP) and 97.18 % for Cr(VI) at 90 min) in multi-pollutants environment, significantly higher than the hollow cubic with Z-scheme heterojunction in single-pollutant environment (98.07 % for CIP and 98.72 % for Cr(VI) at 140 min). Defective ZnS acts as the core for direct charge transfer and separation to form a unique cascaded Z-scheme heterojunction system that blocks the type II charge transfer pathway to achieve ultra-efficient charge transfer. Furthermore, the structural characterization and ROS experimental results based on multi-pollutants models show that the cascade Z-scheme system greatly facilitates the ROS release kinetics and further leads to more electron-deficient cubic surfaces while increase the directional conversion to singlet oxygen ( 1 O 2 ) in multi-pollutants environment. Further tests of intermediates and reusability indicated its potential for the high-efficient treatment of multiple pollution systems.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 20
·16077-16098
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IF 2.779
Chen Keke,Feng Hange,Li Lingwei,Luo Menghao,Xue Shaolin,Sang Jingxin
The excellent photoresponse of semiconductors enables them as a promising photocatalyst for photocatalytic degradation of organic pollutants and antibiotics, but their practical applications are limited by photogenerated carrier recombination, instability, and fixed energy band positions. Herein, we designed and synthesized a dual Z-scheme flower-like spherical Ag 3 PO 4 /MoS 2 /g-C 3 N 4 (AMN) photocatalyst loaded with different mass of g-C 3 N 4 (3, 5 and 7 mg). Under visible light irradiation, MoS 2 enhanced the light absorption range of AMN composite. The holes concentrated in the valence band of Ag 3 PO 4 provide strong oxidation capacity, and the electrons retained in conduction band of g-C 3 N 4 provide strong reduction ability in the photocatalytic system. It is helpful to improve the separation efficiency of photogenerated carriers and enhance the photocatalytic activity of AMN composite. The AMN photocatalyst loaded with 5 mg g-C 3 N 4 (AMN-5) has the optimal photocatalytic activity. The photocatalytic degradation efficiency of the photocatalyst for methylene blue (MB) within 24 min is 3.98, 1.85, and 1.17 times that of g-C 3 N 4 , Ag 3 PO 4 , and Ag 3 PO 4 /MoS 2 , respectively. After three cycles, the degradation efficiency of AMN-5 for MB decreased from 99.44% to 90%, about 3.79 times of Ag 3 PO 4 (23.77%). In addition, the optimal AMN-5 photocatalyst also has excellent photocatalytic degradation efficiency for Rhodamine B (RhB) and tetracycline (TC). This design and concept provide a promising insight for the photocatalytic degradation of pollutants.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2022
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IF 4.644
Niandan He,Zongxue Yu,Guangcheng Yang,Xuyang Li,Qingcan Xiang,Qian Huang,Yucheng Liu
In this experiment, a photocatalyst with a Z-scheme heterojunction was constructed that g-C 3 N 4 nanosheets are connected with NH 2 -MIL-88 B(Fe) via carbon quantum dots (CDs) bridges (similar bridge structures) under solvothermal action, where g-C 3 N 4 nanosheets were prepared by nitric acid pretreatment and secondary thermal oxidation. The composite has higher photo-reduction efficiency of Cr (Ⅵ) and photodegradation efficiency of MB than that of single component. The rate of photocatalytic reduction of Cr (Ⅵ) by the composite material is 21.8 times of g-C 3 N 4 and 4.1 times of NH 2 -MIL-88 B(Fe)/CDs, respectively, and has better chemical stability and reusability. In the whole system, CDs not only acts as a bridge for electron transfer to induce π-π* transition, but also acts as an electron donor and acceptor due to its excellent charge characteristics. It can provide e − for the reduction of Cr (Ⅵ) and consume h + , which can effectively inhibit the recombination of e − /h + and improve the photocatalytic activity and efficiency. The mechanism of Z-Scheme charge transfer was further confirmed by the capture experiment of active species. The activity remains stable and efficient after four catalytic cycles, which offers great possibilities for practical production applications.
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