JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Weigang Cui,Churu Zhang,Shuangjiang Li,Yi Liu,Long Tian,Mengrui Li,Yunfei Zhi,Shaoyun Shan
In this study, copper oxide (CuO) was prepared by the microwave-assisted hydrothermal technique subsequently, CuO was grown in situ onto different rare metal compounds to prepare Z-scheme heterojunctions to improve the degradation efficiency of tetracycline (TC) in water environments. Various characterization proved the successful synthesis of all composite materials, and the formation of tight heterojunction interfaces, among which, the core–shell structure ZnIn 2 S 4 @CuO exhibited excellent photocatalytic degradation capability. Research results indicated that the degradation efficiency of ZnIn 2 S 4 @CuO for TC (50 mg/L) in the water environment reached 95.8 %, and the degradation rate is 2.41 times and 12.93 times that of CuO and ZnIn 2 S 4 alone, respectively, the reason is because of the introduction of ZnIn 2 S 4 , Z-scheme heterojunction structures and internal electric field (IEF) is constructed and formed to extend the visible light response range of photocatalysts to improve electron-hole separation efficiency, and enhance charge transfer. In addition, ZnIn 2 S 4 @CuO-2 exhibited good stability and reproducibility, with no significant loss of activity after five cycles. Finally, the precise locations of free radical attack on TC were investigated by the combined use of high-resolution mass spectrometry (HR-MC) and frontier electron densities (FEDs), and a reasonable degradation pathway was provided. The results of this research provide a new and viable approach to overcome the limitations of conventional photocatalytic materials in terms of limited visible light absorption range and fast carrier recombination rates, which offers promising prospects for a wide range of applications in the field of wastewater purification.
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高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 16
·1290
·
IF 4.3
Jingfei Luan,Anan Liu,Liang Hao,Boyang Liu,Hengchang Zeng
A pyrochlore-type crystal structure photocatalytic nanomaterial, Ho 2 FeSbO 7 , was successfully synthesized using a hydrothermal method. Additionally, a fluorite-structured Bi 0.5 Yb 0.5 O 1.5 was prepared via rare earth Yb doping. Finally, a novel Ho 2 FeSbO 7 /Bi 0.5 Yb 0.5 O 1.5 heterojunction photocatalyst (HBHP) was fabricated using a solvothermal method. The crystal structure, surface morphology, and physicochemical properties of the samples were characterized using XRD, a micro-Raman spectrometer, FT-IR, XPS, ultraviolet photoelectron spectroscopy (UPS), TEM, and SEM. The results showed that Ho 2 FeSbO 7 possessed a pyrochlore-type cubic crystal structure (space group Fd-3m, No. 227), while Bi 0.5 Yb 0.5 O 1.5 featured a fluorite-type cubic structure (space group Fm-3m, No. 225). The results of the degradation experiment indicated that when HBHP, Ho 2 FeSbO 7 , or Bi 0.5 Yb 0.5 O 1.5 was employed as a photocatalytic nanomaterial, following 140 min of visible light irradiation, the removal efficiency of ciprofloxacin (CIP) reached 99.82%, 86.15%, or 73.86%, respectively. This finding strongly evidenced the remarkable superiority of HBHP in terms of photocatalytic performance. Compared to the individual catalyst Ho 2 FeSbO 7 , Bi 0.5 Yb 0.5 O 1.5 , or N-doped TiO 2 , the removal efficiency of CIP by HBHP was 1.16 times, 1.36 times, or 2.52 times higher than that by Ho 2 FeSbO 7 , Bi 0.5 Yb 0.5 O 1.5 , or N-doped TiO 2 , respectively. The radical trapping experiments indicated that in the CIP degradation process, the hydroxyl radical owned the strongest oxidation ability, followed by the superoxide anion and the photoinduced hole. These studies are of great significance for the degradation of antibiotics and environmental protection.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Fahang Xu,Qianqian Zhang,Rushun An,Ling Li,Limin Zhou
A novel Z-scheme 3D flower-like NH 2 -UIO-66/BiOCl composite was fabricated by a facile solvothermal method. The structural characterization results demonstrate that NH 2 -UIO-66 is embedded on the smooth surface of the flower-like BiOCl, forming a tight contact interface. As a visible light collector, NH 2 -UIO-66 expands the optical absorption range of BiOCl, which is confirmed by the UV-Vis diffuse reflectance spectra (DRS). By combining UV-Vis DRS, Mott-Schottky (MS) plots and VB-XPS, a well-matched band structure between NH 2 -UIO-66 and BiOCl is obtained. Photoelectrochemical characterizations indicate that the synergistic effect between NH 2 -UIO-66 and BiOCl interfaces facilitates the separation and transfer of photogenerated electron-hole pairs. In the case of photocatalytic performance experiments, the removal efficiency of the prepared NU66/BOC composites for TC-HCl was higher than either NH 2 -UIO-66 or BiOCl under simulated solar irradiation. NU66/BOC-20 exhibited the best performance with K app value (0.01269 min −1 ), which is 84 and 3 times more than the pristine NH 2 -UIO-66 (0.00015 min −1 ) and BiOCl (0.00410 min −1 ), respectively. In addition, NU66/BOC-20 composite demonstrates remarkable stability with a TC-HCl removal rate of 83% in the third cycle. The radical quenching experiments indicate that the primary active species is superoxide radicals (·O 2 − ) while holes (h + ) play a role to some extent. Based on the above experimental results and in-situ irradiated XPS , Z-scheme was proposed to explain the electron transfer pathway in the photocatalytic process.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ahmed Uddin,Muhammad Bilal,Jinchen Qian,Muhammad Akram,Qingquan He
This study presents a novel ZnO/Oxygen-doped g-C 3 N 4 (ZnO/OCN) nanocomposite photocatalyst for enhanced bisphenol A (BPA) degradation and CO 2 reduction. Synthesized via a facile air calcination-assisted hydrothermal method, the ZnO/OCN heterojunction exhibits significantly improved photocatalytic activity compared to individual ZnO and OCN under visible light irradiation. A remarkable 92.52% BPA degradation was achieved within 180 min using the ZnO/OCN (5%) composites. Additionally, the optimal composite yields CO and CH 4 production of 59.76 and 4.94 μmol⋅g −1 ⋅h −1 , respectively, approximately 6.64 and 2.5 times than those individual catalysts. This enhanced performance stems from the construction of a Z-scheme heterojunction, which facilitates efficient charge separation and transfer and minimizes electron-hole recombination, thereby boosting the overall photocatalytic performance. A Z-scheme mechanism mediated by oxygen vacancy was suggested for charge separation in the heterojunction. This mechanism involves the recombination of photoinduced electrons, trapped at the oxygen defect levels of ZnO, with holes in the valence band of OCN at the heterojunction interface. A comprehensive investigation, integrating radical trapping experiments and electron paramagnetic resonance (EPR) spectroscopy, confirms the critical role of lattice oxygen in the generation of O 2 − and OH. This highly efficient and sustainable photocatalytic system offers a promising solution for the simultaneous remediation of pollutants and mitigation of greenhouse gases.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Guanshu Zhao,Jing Ding,Fanyang Zhou,Xueqi Chen,Liangliang Wei,Qingwei Gao,Kun Wang,Qingliang Zhao
Inefficient utilization of photo-induced charge carriers and low recyclability are limitations for photocatalyst to get access to the practical application. A novel ternary BiVO 4 /g-C 3 N 4 /NiFe 2 O 4 composite with dual Z-scheme heterojunction was successfully developed and constructed to enhance the separation of photo-induced charge carriers and the absorption range of visible light. The structure, composition, morphology, magnetic, and optical properties of this photocatalyst were investigated comprehensively. The photocatalytic performance, mechanism, and pathway of ofloxacin degradation under visible light were studied. Results indicated that the internal interaction between different semiconductors presented the successful fabrication of ternary composite, and its red shift of adsorption range of visible light contributed to an enhancement of photocatalytic ability. The as-prepared ternary composite exhibited highest photocatalytic removal rate constant for ofloxacin, which was 3.8, 16.3 and 71.2 times as much as that of the pure BiVO 4 , pure g-C 3 N 4 and pure NiFe 2 O 4 , respectively. The five successive recycling experiments exhibited the high photocatalytic stability of the as-prepared catalyst, with simple recovery operation due to its magnetic property. The holes and superoxide radicals dominated the photocatalytic degradation process of pollutants. A dual Z-scheme heterojunction other than conventional heterojunction was responsible for the enhancement on redox capacity and the separation of charge carriers. Different transformation products during ofloxacin photocatalytic degradation were identified and transformation pathway was put forward. This study provides a promising strategy on the application of visible-light-driven photocatalysts in water treatment.
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Small
·
2024
·Vol. 20
·期 27
·2309541
·
IF 13
Tingting Liu,Kaiyue Hu,Yansheng Li,Yanhong Wang,Dongmei Han,Zhihua Wang,Fubo Gu
The Z-scheme MIL-88B/BiOBr (referred to as M x B y , whereas x and y are the mass of MIL-88B(Fe) and BiOBr) heterojunction photocatalysts are successfully prepared by a facile ball milling method. By adding low concentration H 2 O 2 under visible light irradiation, the Z-scheme heterojunction and photocatalytic-Fenton-like reaction synergistically enhance the degradation and mineralization of ciprofloxacin (CIP). Among them, M50B150 showed efficient photodegradation efficiency and excellent cycling stability, with 94.6% removal of CIP (10 mg L −1 ) by M50B150 (0.2 g L −1 ) under 90 min of visible light. In the M x B y heterojunctions, the rapid transfer of photo-generated electrons not only directly decomposed H 2 O 2 to generate · OH, but also improved the cycle of Fe 3+ /Fe 2+ pairs, which facilitated the reaction with H 2 O 2 to generate · OH and · O 2 − radicals. In addition, the effects of photocatalyst dosages, pH of CIP solution, and coexisting substances on CIP removal are systematically investigated. It is found that the photocatalytic- Fenton-like reaction can be carried out at a pH close to neutral conditions. Finally, the charge transfer mechanism of the Z-scheme is verified by electron spin resonance (ESR) signals. The ecotoxicity of CIP degradation products is estimated by the T.E.S.T tool, indicating that the constructed photocatalysis-Fenton-like system is a green wastewater treatment technology.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Congcong Shen,Kemeng Sun,Lei Zhang,Tao Wen
The disposal of pertechnetate anion ( 99 TcO 4 − ) in wastewater has been an important issue due to the high mobility, radioactive and chemical toxicity of 99 TcO 4 − . In this study, a facile and feasible hydrothermal approach was proposed to prepare graphitic carbon nitride/titanium dioxide (g-C 3 N 4 /TiO 2 ) heterojunctions, aiming at the reduction of rhenium (VII) (Re(VII), a surrogate for technetium(VII)) by photocatalysis. Compared to the individual components of g-C 3 N 4 or TiO 2 , the photocatalytic reduction performance for perrhenate anion (ReO 4 − , 10 mg/L) over CNT-20 (the mass ratio of g-C 3 N 4 to TiO 2 is 20 wt%, 40 mg) is significantly improved, achieving ∼93 % within 10 min under an air atmosphere and UV–vis light irradiation. Furthermore, the obtained g-C 3 N 4 /TiO 2 demonstrates excellent stability and maintains a high activity of ∼82 % after five cycles. Importantly, in the presence of various coexisting ions, the reduction efficiency remained at about 85–90 %. However, the reduction efficiency for Re(VII) declined to approximately 40–50 % when organic pollutants (10 ppm MO or HA) were introduced. The effective combination between g-C 3 N 4 and TiO 2 brings out a Z-scheme type g-C 3 N 4 /TiO 2 heterojunction, which promotes spatial separation and synergistic utilization of photogenerated carriers. Besides, electron paramagnetic resonance (EPR) characterization indicates that the carbon dioxide radical anion (•CO 2 − ) generated from the oxidation of formic acid/formate anion contribute to the fast reduction removal of ReO 4 − . This work provides a practical and user-friendly hydrothermal technique for rapidly and efficiently reducing nonradioactive Re(VII), which may offer a potential way to dispose of the radionuclide technetium(VII) ( 99 Tc(VII)).
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhengyu Ding,Yalong Liu,Jiali Yu,Zheyao Xia,Jun Zhang,Kainan Guo,Jinke Guo,Binjie Xin,Shouzhi Yan
Biomimetic “flower-on-fiber” Janus membranes were engineered. • Achieved >99% emulsion separation and 97.4% TCH degradation under visible light. • Proposed Z-scheme supported by EPR/DFT boosts visible-light charge separation. • Asymmetric wettability enables unidirectional oil transport and “Janus boat” application. • Synergistic physical/photocatalytic mechanism confers 99.99% antibacterial rate. The remediation of complex industrial wastewater—characterized by the coexistence of emulsified oils, soluble organic micropollutants, and pathogenic bacteria—necessitates a paradigm shift from passive filtration to active, multifunctional interface engineering. To address this, a novel biomimetic “flower-on-fiber” Janus membrane was engineered via a sequential electrospinning and spray-deposition strategy. The membrane features a rationally designed asymmetric architecture, integrating a hydrophobic Z -scheme photocatalytic top-layer (BiOBr/ZnO/TiO 2 @PVDF) with a hydrophilic substrate (PAN@PEG). Molecular Dynamics (MD) simulations were used as qualitative support to examine the water/BiOBr interfacial behavior, indicating that water molecules tend to remain aggregated rather than spread on the BiOBr lattice. Consequently, the membrane achieved high-efficiency separation (>99%) of surfactant-stabilized water-in-oil emulsions with a superior flux of 2120 ± 119 L m −2 h −1 . Beyond physical separation, the constructed heterojunction promoted visible-light absorption and suppressed charge recombination. This endowed the membrane with exceptional “active” defense capabilities: a 97.4% degradation efficiency for tetracycline hydrochloride (TCH) and a 99.99% antibacterial rate against E. coli via a synergistic “physical puncture-photocatalytic oxidation” dual-mode mechanism. This work demonstrates a proof-of-concept Janus membrane platform that couples structural biomimicry with Z -scheme heterojunction engineering to integrate water-in-oil emulsion separation, visible-light-driven tetracycline degradation, and antibacterial activity against E. coli .
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ACS Applied Energy Materials
·
2026
·
IF 5.5
Xiaoling Peng,Ying Luo,Jiawei Xue,Farzaneh Arabpour Roghabadi,Qiang Wang,Zheng Wang,Hong He
Visible-light-driven CO2 reduction coupled with H2O oxidation is an attractive route toward artificial photosynthesis; however, its realization is often limited by inefficient charge separation in a CO2-reduction photocatalyst, sluggish interfacial charge transfer in Z-scheme systems, and insufficient CO2 activation. Herein, we report a visible-light-driven Z-scheme system in which CoOx−Ag dual-cocatalyst-modified Bi4TaO8Cl0.9Br0.1 served as the CO2-reduction photocatalyst, surface-treated WO3 as the H2O-oxidation photocatalyst, and I−/IO3− as the redox mediator. The CoOx−Ag dual cocatalysts play distinct yet cooperative roles in the Z-scheme architecture. CoOx preferentially extracts photogenerated holes and accelerates mediator oxidation, thereby promoting charge separation in Bi4TaO8Cl0.9Br0.1 and facilitating inter-photocatalyst charge transfer, whereas Ag acts as an electron-enrichment center that enhances CO2 adsorption and activation and promotes the formation of the key *COOH intermediate for selective CO production. Owing to this synergistic regulation of charge transfer and surface reaction kinetics, the optimized Z-scheme system achieved selective CO2 reduction to CO with near 100% selectivity and synchronous O2 evolution in a near-stoichiometric ratio relative to CO under visible-light irradiation. This work offers a dual-cocatalyst design strategy for efficient visible-light-driven Z-scheme CO2 reduction coupled with H2O oxidation.
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Yundong Zeng,Yunlan Xu,Dengjie Zhong,Jiaxin Mou,Haoyang Yao,Nianbing Zhong
The development of photocatalytic fuel cell (PFC) with visible-light response is usually limited by the low efficiency of electron-hole separation in photoanode . In this work, 20%-PTh/Ag 3 PO 4 /BiOI/Ti photoanode was prepared for the first time to construct a PFC with Cu 2 O/Cu cathode to degrade rhodamine B. With visible-light stimulation, the rhodamine B degradation rate, maximum photocurrent density and maximum power density of the PFC were respectively 96.33% (2 h), 0.39 mA cm −2 and 82.20 μW cm −2 . The main active species in the PFC were proved by quenching experiments to be h + , ∙OH and ∙O − 2 . The satisfactory performance of the PFC was due to that a double Z-scheme heterojunction was formed in the photocatalyst of 20%-PTh/Ag 3 PO 4 /BiOI/Ti photoanode, which made the photogenerated electrons of Ag 3 PO 4 and BiOI directly combine with the photogenerated holes of PTh , so that the photogenerated holes of Ag 3 PO 4 and BiOI and the photogenerated electrons of PTh directly or indirectly participated in the degradation reaction of RhB. In this way, the separation efficiency of electron-hole pairs in the photoanode was improved, and the performance of the PFC was significantly enhanced.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
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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CHEMICAL ENGINEERING JOURNAL
·
2022
·
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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