COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Bolong Liang,Hongbin He,Xi Zhu,Shu-Xuan Liang
The residue of oxytetracycline hydrochloride (OTC) has emerged as a significant concern impacting both human health and the ecological environment. Photocatalysis has a good application prospect in the treatment of antibiotic pollution due to its advantages of lost cost, high efficiency and environmental friendliness, and the development of photocatalyst has become crucial for achieving effective photocatalytic degradation. The preparation of Z-scheme heterojunction is regarded as an effective strategy to enhance photocatalytic activity. Herein, double Z-scheme MIL-101(Fe)@AgI@TPA/TPB heterojunction materials were innovatively designed and successfully prepared. MIL-101(Fe)@AgI@TPA/TPB could achieve 95.09 % OTC removal efficiency under visible light irradiation in 70 min. The investigation of photoelectric properties and mechanisms revealed that MIL-101(Fe)@AgI@TPA/TPB had a broader range and enhanced ability for light absorption, along with a narrower band gap. It was determined that ·O 2 - and ·OH were the primary active species involved in the photocatalysis process. The mechanism of double Z-scheme heterojunction capable of facilitating efficient photocatalytic degradation was proposed, and the intermediate products and decomposition pathways of OTC in the photocatalytic degradation process were analyzed. This study provides innovative insights into practical application through the prepared double Z-scheme heterojunction photocatalyst aimed at remediating OTC contamination in water environments.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Haiping Liu,Jing Liang,Li shao,Jinge Du,Qiancheng Gao,Shuai Fu,Li Li,Miao Hu,Fengying Zhao,Jianguo Zhou
The dual defect mediated Z-scheme MoS 2 /g-C 3 N 4 photocatalyst was fabricated via a simple ultrasonic dispersion and annealing method. The structural, optical and electronic property was systematically characterized. X-ray photoelectron spectroscopy (XPS) analysis demonstrated that the MoS 2 was anchored on the g-C 3 N 4 through strong interface electrostatic interaction , which led to the formation of built-in electric field at the contact interface. The optimized MoS 2 /g-C 3 N 4 heterojunction achieved a superior photoefficiency towards bisphenol A (BPA) degradation and exhibited the reaction rate normalized to specific surface area of 3.22 × 10 −4 g·min −1 m −2 , approximately 10.0 and 6.7 times larger than these of g-C 3 N 4 and MoS 2 , respectively. The origin of the enhanced photocatalytic activity of MoS 2 /g-C 3 N 4 was attributed to the formation of intimate Z-scheme surface heterostructure between MoS 2 and g-C 3 N 4 , thus improved the light-harvesting ability, facilitated fast charge separation and created more active sites. The impact of anionic towards degradation efficiency was investigated. The degradation activity and degree of BPA were investigated by three-dimensional excitation-emission matrix (3D EEM) fluorescence technique. The Z-scheme charge transfer mechanism and the significant contribution of holes (h + ) and superoxide radicals ( O 2 − ) were demonstrated by electron spinning resonance (EPR), radical scavenger experiment and spectral quantification technology. This work could offer a new protocol for the design of highly efficient heterostructure photocatalysts towards environmental remediation.
研究领域:
材料科学
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光催化
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环境修复
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纳米材料
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能量转换
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OPTICAL MATERIALS
·
2022
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IF 3.754
Jinfen Niu,Kai Wang,Lan Yang,Jiahui Shi,Yue Zhang,Fan Yang,Xiaojiao Yu,Binghua Yao
Photocatalysis can be a potential technique for decomposing antibiotics contaminants from water. In this study, g-C 3 N 4 modified Bi/BiOBr nanosphere were prepared by a simple microwave solvothermal method, and the structure-properties relationships of the Z-scheme heterojunction were evaluated in degrading organic dyes. Various characterization techniques were then applied to elucidate the structure-performance relationships of the resulting heterojunction photocatalysts in degrading CIP. Compared with pristine g-C 3 N 4 or Bi/BiOBr, the g-C 3 N 4 @Bi/BiOBr nanocomposites showed heightened property in photocatalytic degradation of CIP. The photocatalytic efficiency of CIP decomposition over the Z-scheme of g-C 3 N 4 @Bi/BiOBr heterojunction was about 2.38 and 1.35 times homologous to those of original g-C 3 N 4 and Bi/BiOBr. The enhancement in photocatalytic activity of g-C 3 N 4 @Bi/BiOBr could be described by the Z-scheme pathway and the SPR effect of Bi 0 , which broadened visible light absorption and promoted the separation of photoinduced carriers. In addition, the effect of typical water matrix factors, such as pH, anionic, and cationic on photodegradation rate were evaluated. Furthermore, results of scavenging experiments showed that ·OH, ·O 2 − , and h + all participate in the degradation of CIP. Based on the band structure and scavenging measurements, a possible photocatalytic mechanism for the as-synthesized g-C 3 N 4 @Bi/BiOBr composites was proposed.
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Journal of Integrative Agriculture
·
2023
·
IF 4.8
Yang-yang XIAO,Jia-jia QIAN,Xing-liang HOU,Lan-ting ZENG,Xu LIU,Guo-guo MEI,Yin-yin LIAO
The sweet potato weevil ( Cylas formicarius (Fab.) (Coleoptera: Brentidae)) is a pest that feeds on sweet potato ( Ipomoea batatas (L.) Lam. (Solanales: Convolvulaceae)), causing substantial economic losses annually. However, no safe and effective methods have been found to protect sweet potato from this pest. Herbivore-induced plant volatiles (HIPVs) promote various defensive bioactivities, but their formation and the defense mechanisms in sweet potato have not been investigated. To identify the defensive HIPVs in sweet potato, the release dynamics of volatiles was monitored. The biosynthetic pathways and regulatory factors of the candidate HIPVs were revealed via stable isotope tracing and analyses at the transcriptional and metabolic levels. Finally, the anti-insect activities and the defense mechanisms of the gaseous candidates were evaluated. The production of ( Z )-3-hexenyl acetate ( z 3HAC) and allo -ocimene was induced by sweet potato weevil feeding, with a distinct circadian rhythm. Ipomoea batatas ocimene synthase (IbOS) is first reported here as a key gene in allo -ocimene synthesis. Insect-induced wounding promoted the production of the substrate, ( Z )-3-hexenol, and upregulated the expression of IbOS , which resulted in higher contents of z 3HAC and allo -ocimene, respectively. Gaseous z 3HAC and allo -ocimene primed nearby plants to defend themselves against sweet potato weevils. These results provide important data regarding the formation, regulation, and signal transduction mechanisms of defensive volatiles in sweet potato, with potential implications for improving sweet potato weevil management strategies.
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Solar RRL
·
2022
·Vol. 7
·期 3
·2200784
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IF 9.173
Minjie Zhang,Yanming Lin,Jiayi Li,Xinru Wei,Ying Peng,Zhengkun Wang,Zhenyi Jiang
Sn-based perovskite materials with nontoxic, low cost, and unique structure have attracted much attention. However, their efficiency only reaches 14.09% due to the higher carrier recombination rate and short carrier lifetime in photovoltaic applications. Herein, the interfacial electronic structure, optical absorption, interfacial charge transfer mechanism, and photovoltaic performance of the CsSnBr 3 /MoSe 2 perovskite heterostructure are systematically investigated by theoretical calculation and experimental observation. The results indicate that the strong coupling and hybridization of interfacial electronic states can lead to a narrowing bandgap, which induces an excellent optical absorption of the CsSnBr 3 /MoSe 2 perovskite heterostructure in the visible spectrum. Excitingly, the charge transfer at the interface forms a built-in electric field, which can effectively promote the interfacial charge transfer between CsSnBr 3 (001) and MoSe 2 monolayer, complying with a Z-scheme mechanism. Moreover, the photovoltaic performance of the CsSnBr 3 /MoSe 2 heterostructure significantly enhances due to excellent light absorption and Z-scheme system for extending carrier lifetime. An effective strategy for designing highly efficient Sn-based perovskite solar cells is reported.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Taotao Qiang,Shaoting Wang,Longfang Ren,Xiaodong Gao
ZIF-8 exhibits poor visible light response and rapid electron-hole recombination. To address these problems, we constructed an N-CQD/ZIF-8 framework by in-situ synthesis method, then prepared a novel Z-scheme heterostructure photocatalyst (Cu 2 O/N-CQD/ZIF-8) by reduction precipitation method for the efficient photocatalytic reduction of Cr(Ⅵ). Cu 2 O/N-CQD/ZIF-8 (with a 10% Cu 2 O loading) had a unique heterostructure and exhibited significantly improved performance for Cr(Ⅵ) photoreduction . This photocatalyst successfully reduced 98.99% of the Cr(Ⅵ) in a pH = 3 solution system, which was 6 times higher than that of ZIF-8. Meantime, due to its stable interfacial adhesion, the reduction efficiency of Cr(Ⅵ) by Cu 2 O/N-CQD/ZIF-8 still reached 97.13% after five cycles. Therefore, Cu 2 O/N-CQD/ZIF-8 exhibited superior photocatalytic activity and recyclability compared with unmodified ZIF-8. The charge transfer path of this Z-scheme heterojunction was verified by free radical trapping experiments and X-ray photoelectron spectroscopy. Moreover, a possible charge transfer mechanism was proposed. N-CQD provided a potential driving force for the construction of the internal Z-scheme charge transfer system. Moreover, the synergistic effect between Cu 2 O and ZIF-8 inhibited the rapid recombination of photogenerated electron-hole pairs. This work provides potential insights for the innovative design of high-performance photocatalysts based on metal-organic frameworks for the restoration of Cr(Ⅵ)-containing wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Ganghua Zhou,Lirong Meng,Xin Ning,Weiqin Yin,Jianhua Hou,Qiao Xu,Jianjian Yi,Shengsen Wang,Xiaozhi Wang
Constructing type II heterojunction is an efficient strategy to enhance the light absorption and promote the charge transport. However, the improvement effect is limited by the decreased redox ability of charge carriers. The rational design of heterojunction from type II to Z-scheme is expected to overcome this obstacle. Herein, we demonstrate that the introduction of interfacial oxygen vacancies (OVs) can switch charge transfer of g-C 3 N 4 /BVO heterojunction from type II to Z-scheme. The interfacial OVs acted as the reactive center of charge carriers to quench the electrons of BVO and holes of g-C 3 N 4 , thereby promoting charge separation and migration. As a result, the interfacial OVs mediated Z-scheme g-C 3 N 4 /BVO heterojunction kept the strong oxidation/reduction potential of two single-component photocatalysts thereby significantly enhancing the photodegradation of tetracycline and CO 2 photoreduction. The kinetic constant of tetracycline degradation on the optimal g-C 3 N 4 /BVO-20 sample was 2.04-fold and 2.29-fold higher than those on g-C 3 N 4 nanosheets and pure BVO, respectively. This work provides a feasible strategy by the interfacial vacancy engineering of heterojunction for enhanced photocatalysis .
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ENVIRONMENTAL RESEARCH
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2022
·
IF 8.431
Yanqing Cong,Jiaxin Yi,Shengna Liang,Feng Zhang,Yi Zhang,Shi-Wen Lv
Bimetallic oxides with spinel structure show great prospects in the photocatalysis owing to many active sites. Herein, a novel 500NiCo 2 O 4 @CdS–5%Ag composite was fabricated via a feasible strategy. Interestingly, the combination with NiCo 2 O 4 could significantly enhance the absorption ability of CdS for visible light. Benefiting from the formation of heterojunction structure between NiCo 2 O 4 and CdS, the recombination of photogenerated electrons and holes was remarkably restrained. As an effective mediator, deposition of Ag could further promote the transfer of photogenerated charge carriers, thereby accelerating the reaction rate. Meanwhile, light absorption capacity of composite was also improved, owing to the surface plasmon resonance effect of metallic Ag. More importantly, 500NiCo 2 O 4 @CdS–5%Ag composite with great stability displayed an excellent performance in the photocatalytic degradation of OFX, and its highest removal efficiency was as high as 99.14%. Possible degradation pathways of OFX were given, and most of OFX could be degraded into CO 2 , H 2 O and other by-products with no toxicity. Significantly, the separation and transfer of photogenerated charge carriers followed indirect Z-scheme heterojunction mechanism. The O 2 − , OH and 1 O 2 were main active species in photocatalytic reaction system. All in all, current work inspired some new ideas for designing novel photocatalytic system in wastewater treatment .
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PubMed
高影响因子
RARE METALS
·
2022
·Vol. 41
·期 6
·2094-2107
·
IF 6.318
Xu Chong,Zhou Qin,Huang Wei-Ya,Yang Kai,Zhang Yong-Cai,Liang Tong-Xiang,Liu Zhao-Qing
A series of Z-scheme β-Bi 2 O 3 /ZrO 2 heterojunction composites containing three-dimensional (3D) mesoporous silica nanospheres (MSNs) were synthesized as efficient catalysts for antibiotic remediation. The obtained MSN/β-Bi 2 O 3 /ZrO 2 ternary composites possess novel lamellar cross structure, which is well constructed by β-Bi 2 O 3 nanosheets, 3D MSNs, and ZrO 2 nanoparticles. The optimal sample BZS-2 (Bi: Zr: Si = 1: 0.4: 0.33) shows an adsorptive-photocatalytic removal efficiency of 92.7% towards levofloxacin (LVF) and a total organic carbon (TOC) removal efficiency of 60.0% under simulated solar light irradiation for 100 min. BZS-2 can also remove 90.1% and 91.2% of tetracycline hydrochloride (TC) and oxytetracycline hydrochloride (OTC), respectively, and the maximum adsorption capacity of TC over BZS-2 is almost 10 times that of β-Bi 2 O 3 . The improvement of photocatalytic activity can be mainly attributed to the enhanced visible-light adsorption capacity and more efficient separation of photogenerated electron–hole pairs. A possible Z-scheme photocatalytic mechanism of β-Bi 2 O 3 /ZrO 2 heterojunctions based on valence band offset (Δ E VBO ) and conduction band offset (Δ E CBO ) is proposed. This study provides an efficient way to construct novel mesoporous ternary photocatalyst with increased accessible surface area and active sites for treatment of antibiotics by synergistic adsorption and photocatalysis. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xufei Li,Yanling Qiu,Zhiliang Zhu,Ting Chen,Hua Zhang,Daqiang Yin
Insufficient photocatalytic activity and poor recyclability are considered as two main factors that limit the further application of photocatalysts in environmental remediation. Herein, a new magnetic g-C 3 N 4 /α-Fe 2 O 3 /Bi 3 TaO 7 (CN/FO/BTO) heterojunction with dual Z-scheme system was first synthesized via an ultrasound-assisted calcination process. The results showed that the removal efficiency of ciprofloxacin (CIP) by optimized CN/FO/BTO heterojunction could reach 95.6% within 120 min illumination of visible light, which was 6.1, 15.9, 5.2, 3.7 and 2.3 times as much as that of single CN, FO, BTO, binary CN/FO and CN/BTO, respectively. Characterization analysis indicated that the improved photocatalytic activity derived from the synergistic effects of the three components, including the dispersion of FO and BTO by CN sheet, the enhanced light absorption of CN by addition of FO and BTO, and the reduced photogenerated charge recombination by their intimate contact. Further mechanism study revealed that the dual Z-scheme system of CN/FO/BTO leaded to efficient photoexcited carrier separation and strong redox capacity, in which •O 2 – and •OH were main radicals during photocatalytic process. Meanwhile, CN/FO/BTO possessed supreme adaptability to pH as well as co-existing matters, favorable magnetic separation property and excellent stability, making it a potential candidate for environmental remediation applications.
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Nanoscale
·
2022
·Vol. 14
·期 32
·11664-11675
·
IF 8.307
Fangting Liu,Chengcheng Chen,Qiaoyu Zhang,Zhengguo Zhang,Xiaoming Fang
Direct Z-scheme photocatalytic systems are very promising composite photocatalysts, and their photocatalytic performance is highly associated with the quality of the interface within them. Herein, a novel direct Z-scheme heterojunction with a coherent interface has been presented for the first time. Specifically, the heterojunction was constructed by dispersing pre-prepared BiVO4 crystals into the reaction system to synthesize Cu3SnS4, followed by a hydrothermal reaction. It is shown that Cu3SnS4 was deposited on the surface of each pre-prepared BiVO4 crystal as a thin layer via heterogeneous nucleation to acquire a core–shell heterojunction. The BiVO4@Cu3SnS4 heterojunction was found to possess an atomic coherent interface, which is formed through the bonding between the (121) plane of BiVO4 and the (112) plane of Cu3SnS4, originating from the matching in the crystalline lattice between the two planes. The coherent interface facilitated the charge transfer from Cu3SnS4 to BiVO4 owing to the difference in their Fermi levels, thereby forming a built-in electric field pointing from Cu3SnS4 to BiVO4. Reduced fluorescence emission and a shortened carrier lifetime reveal an obvious reduction in the inter-band charge recombination for the optimal BVO@CTS-0.19 sample. Consequently, BVO@CTS-0.19 shows remarkably enhanced photocatalytic performance in MO degradation, Cr6+ reduction and oxygen evolution. The Z-scheme charge transfer mechanism for BVO@CTS-0.19 was verified by a suite of techniques. This work provides a universal strategy for building a coherent interface to develop high-performance direct Z-scheme heterojunctions.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Min Zhang,Muhammad Arif,Yunyuan Dong,Xiaobin Chen,Xiaoheng Liu
In photocatalysis as a “green chemistry” technology, the development of efficient strategies to fabricate high-performance micro-nano photocatalysts with robust solar light utilization to deal with persistent pharmaceutical products in the wastewater system is crucially important. In order to improve the photoelectric activity, interfacial charge transfer, and reduce the recombination rate of photo-generated electron-hole pair, a Z-scheme TiO 2−x @ZnIn 2 S 4 heterojunction was prepared by hydrothermal method . The morphological structure and optical properties of the prepared catalysts were extensively characterized. Experimental results show that the rich of oxygen vacancies in TiO 2−x benefits the formation of local defect energy levels at the bottom of the CB , which can be advantageous to broaden the light absorption range. Likewise, the TiO 2−x @ZnIn 2 S 4 showed 12.4-fold and 7.70-fold higher photocatalytic performance pristine TiO 2−x and ZnIn 2 S 4 towards the degradation of tetracycline hydrochloride (TCH) and nitrofurantoin (NFT) in real water matrix and solution water. Furthermore, the photo-decomposition pathway of NFT was proposed by HPLC-MS, and the Z-scheme electron transfer mechanism in TiO 2−x @ZnIn 2 S 4 heterojunction was proposed and discussed in detail. This work emphasizes a facile method for designing high-efficiency oxygen vacancy mediated titanium-based photocatalysts with excellent photoactivity in environmental remediation.
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