Journal of Physical Chemistry C
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2023
·
IF 3.7
Zesheng Deng,Jiazhen Cao,Songchang Hu,Shiqun Wu,Mingyang Xing,Jinlong Zhang
CO2 photoreduction is considered one of the potential ways to achieve carbon neutralization since it uses green solar energy without introducing additional carbon sources during the process of converting CO2 to fuels. However, limited light utilization and poor charge separation often give rise to undesirable CO2 photoreduction performance. Herein, a generic approach using carbon spheres as templates to construct transition metal oxides with multishelled hollow structures is reported. The multishelled hollow structure has been proven to be efficient for improving CO2 photoreduction. Furthermore, we constructed a Z-scheme heterojunction photocatalyst (CdS/Au/ZnCrO4) through introducing CdS into a multishelled hollow ZnCrO4 sphere with Au nanoparticles as a charge transfer medium. Benefiting from the multishelled hollow structure’s induced light utilization and large surface area and Z-scheme heterojuncion promoted charge separation, a high CO production of 2.95 μmol g–1 h–1 was achieved on CdS/Au/ZnCrO4 without using any sacrificial agents, which was 18.4 times and 24.6 times higher than that of CdS and ZnCrO4. This work provides a generic method for constructing controllable multishelled hollow spheres and is expected to offer guidance for promoting CO2 photoreduction through structure regulation and heterojunction construction.
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DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Jiao Wu,Jingyu Hu,Honghong Qian,Jianjun Li,Ran Yang,Lingbo Qu
The Nickel‑cobalt alloys/zinc oxide/graphitic carbon nitride (NiCo/ZnO/g-C 3 N 4 , NCZg) nanocomposites , magnetic Z-scheme heterojunction nanoparticles , were successfully synthesized. A series of characterization techniques were used to study the morphologies, chemical compositions and optical properties of the prepared NCZg. Using oxytetracycline (OTC) and tetracycline (TC) as target contaminants, the visible light degradation activity of NCZg nanocomposites was investigated. Under visible light, NCZg showed high photocatalytic degradation activity. The photocatalytic degradation rates of OTC and TC reached 71.3% and 81.29% in 50 min. The photocatalytic degradation efficiency of NCZg was obviously better than other materials reported in literatures. The capture experiments of reactive species showed that photogenerated holes (h + ) were the primary reason of photocatalytic degradation. This study provides a novel idea for the construction of high-performance photocatalyst for the degradation of OTC.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ziyu Xie,Jing Chen,Yanxin Chen,Tianming Wang,Xia Jiang,Yiming Xie,Can-Zhong Lu
Pd modified ZnIn 2 S 4 /P25 (Pd@ZnIn 2 S 4 /P25) heterostructures have been synthesized by hydrothermal and photo-reduction method. The H 2 evolution rate of optimal photocatalyst 0.5 %Pd modified 5ZnIn 2 S 4 /2P25 (0.5 %Pd@5ZnIn 2 S 4 /2P25) are approximately 9100 and 3693 μmol · g −1 h −1 under simulated sunlight and visible light irradiation with ethanol as the sacrificial agent, which are nearly 9 and 460 times higher than pure ZnIn 2 S 4 and P25, respectively. The promoted photocatalytic performance can be attributed to the physicochemical properties of the catalysts and the strong electronic interaction between Pd modified ZnIn 2 S 4 (Pd@ZnIn 2 S 4 ) and P25, the improved transfer rate of photo-generated electrons and holes, the inhibited recombination of charge carriers, and the enhanced light harvesting. The results of photo-electrochemistry and EPR indicate that it is a Z-scheme photocatalytic system, in which the electrons accumulate on the conduct band of ZnIn 2 S 4 and the holes assemble on the valence band of P25. This work provides an effective method to construct highly efficient photocatalytic systems for solar H 2 generation.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yue-Hua Li,Ming-Yu Qi,Zi-Rong Tang,Yi-Jun Xu
Coupling photocatalytic hydrogen (H2) evolution with selective organic synthesis in one redox cycle showcases great potential for the coinstantaneous utilization of photoexcited electrons and holes toward sustainable production of value-added fuels and chemicals. Herein, we construct one-dimensional/two-dimensional (1D/2D) WO3/ZnIn2S4 (WO3/ZIS) hierarchical Z-scheme composites for bifunctional integrated light-driven H2 production and biomass-derived aromatic alcohol conversion. The superior photoactivity and selectivity over WO3/ZIS composites compared with that over bare WO3 nanorods (NRs) and ZIS nanosheets (NSs) can be attributed to the assembly of the Z-scheme heterostructure. The construction of WO3/ZIS direct Z-scheme composites not only facilitates the charge separation dynamics by transporting photoinduced electrons and holes to spatially separated redox sites but also steers the selectivity of targeted products by tuning the energy band potentials to endow electrons and holes with stronger reduction and oxidation abilities. The mechanistic studies combining the control experiments and electron paramagnetic resonance spectroscopy validate the free radical mechanism of the benzyl alcohol photooxidation reaction. It is anticipated that this work would offer a conducive paradigm for the ingenious design of high-performance Z-scheme heterostructured catalysts toward the solar light-driven collaborative redox of H2 production and selective organic synthesis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Ting Sun,Ping Gao,Yuqing He,Zhiren Wu,Jun Liu,Xinshan Rong
The development of an efficient catalyst that can use solar energy for NH 3 production is of great significance in solving the environmental and energy crisis caused by the traditional ammonia synthesis process. In this work, a dual Z-scheme tubular carbon nitride/zinc sulfide/zinc indium sulfide ternary composited photocatalyst (TCN/ZnS/ZnIn 2 S 4 ) with excellent nitrogen photofixation performance under visible light was prepared by self-assembly and hydrothermal methods . The crystal structure studies confirmed that tubular carbon nitride (TCN) had more active sites that could promote N 2 adsorption. The photochemical studies proved that the double charge transfer channel provided by the dual Z-scheme heterojunction could improve the efficiency of electron-hole separation and achieve excellent photocatalytic nitrogen fixation . The ammonia production rate of the TCN/ZnS/ZnIn 2 S 4 catalyst was up to 136.56 μmol/L, and it also has good stability and reusability. This work provides new insight into the development of Z-scheme heterojunction photocatalysts with green and efficient nitrogen fixation.
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 20
·6045-6057
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IF 7
Fuyan Kang,Xiaona Jiang,Yao Wang,Juanna Ren,Ben Bin Xu,Guoyang Gao,Zhanhua Huang,Zhanhu Guo
Photocatalytic treatment of antibiotics in aqueous ecosystems has become a promising method. However, the low efficiency photogenerated charge separation and slow kinetics of the catalyst severely limit its deployment for industrial applications. Here, the three-dimensional bismuth tungstate (Bi2WO6)/bismuth oxyiodide (BiOI) loaded on biochar (BC/BWI) composite catalyst was designed for the efficient removal of tetracycline (adsorption capacity: 227.09 mg g−1, removal rate: 99.8%). Via construction of Z-scheme heterojunctions at the interface of Bi2WO6 and BiOI, the built-in electric field promotes the directional separation of photogenerated carriers to achieve efficient separation and utilization of photogenerated charges. Meanwhile, the introduction of electron-rich biochar (BC) effectively enhances the adsorption performance, photogenerated electron migration capacity and mass transfer process of the material. The introduction of BC and the building of Z-scheme heterojunctions effectively achieve the spatially synergistic separation of photogenerated charges. The ˙O2− dominates the photocatalytic process, according to the mechanistic studies. The degradation intermediate product testing revealed that tetracycline is efficiently degraded through two main pathways. This work provides ideas for the design of catalysts for the efficient removal of antibiotics from water bodies.
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APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Xiaojing Yu,Haoran Qiu,Zhe Wang,Bin Wang,Qingnan Meng,Shaodong Sun,Yufei Tang,Kang Zhao
Aiming at comparing the charge separation efficiencies of various heterojunctions, such as p-n junction, metal–semiconductor junction, Z-scheme junction, TiO 2 -Au, TiO 2 -BiOI, TiO 2 -BiOI-Au and TiO 2 -Au-BiOI were synthesized by using n-type TiO 2 , p-type BiOI and plasmon metal Au as components for photocatalytic nitrogen fixation. The as-prepared “Z-scheme” TiO 2 -Au-BiOI photocatalyst showed the highest photocatalytic performance for N 2 photofixation with 543.53 μmol L −1 h −1 g −1 in the pure water system, which is 1.68 times higher than that of TiO 2 -BiOI-Au nanocomposite, 1.85 times higher than that of TiO 2 -BiOI and 6.69 times higher than that of TiO 2 -Au, revealing superiority of the heterojunctions of TiO 2 -Au-BiOI in kinetics among these different heterostructured photocatalysts during the photocatalytic N 2 reduction process. Moreover, the as-prepared TiO 2 -Au-BiOI exhibited considerable performance under real natural environment, showing a promising potential in future application.
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CHEMISTRY & BIODIVERSITY
·
2021
·Vol. 18
·期 7
·e2100235
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IF 2.408
Zhongtian Fan,Wengui Duan,Guishan Lin,Ming Chen,Mei Huang
In search of novel natural product-based bioactive molecules, twenty (ten pairs) novel ( Z )-/( E )-anisaldehyde-based oxime ester compounds were designed and synthesized by using anisaldehyde as starting material. Structural characterization of the target compounds was carried out by NMR, FT-IR, ESI-MS, and elemental analysis. Their herbicidal and antifungal activities were preliminarily tested. As a result, at 50 μg/mL, compound ( E )- 5b exhibited excellent to good inhibition rates of 92.3 %, 79.2 %, and 73.9 %, against Rhizoctonia solani , Fusarium oxysporum f. sp. cucumerinum , and Bipolaris maydis , respectively, better than or comparable to that of the positive control chlorothalonil. In addition, at 100 μg/mL, compounds ( E )- 5b , ( E )- 5f , ( Z )- 5f and ( E )- 5d exhibited excellent to good inhibition rates of 85.8 %, 82.9 %, 78.6 % and 64.2 %, respectively, against the root-growth of rape ( B. campestris ), much better than that of the positive control flumioxazin. The bioassay result also showed that the synthesized compounds had obvious differences in antifungal and herbicidal activities between ( Z )- and ( E )-isomers. Preliminary structure–activity relationship was also discussed by theoretical calculation. Graphical
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2020
·Vol. 55
·期 11
·2000093
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IF 1.169
Hongjun Chen,Zi Wang,Zeyang Xue,Chunhu Yu,Lizhai Pei,Chuangang Fan
A Bi 2 O 3 /In 2 O 3 heterojunction is successfully fabricated via a facile hydrothermal method using sodium bismuthate and indium nitrate as the source materials. The crystal structure, composition, micromorphology, and optical property of the Bi 2 O 3 /In 2 O 3 heterojunction are analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectrum, scanning electron microscopy, transmission electron microscopy, and solid ultraviolet-visible (UV-vis) diffuse reflectance spectra. The Bi 2 O 3 /In 2 O 3 heterojunction exhibits a remarkable photocatalytic degradation capacity for Rhodamine B, which is better than that of pure Bi 2 O 3 and In 2 O 3 . The photogenerated charges separation and transfer process of the Bi 2 O 3 /In 2 O 3 heterojunction follows a direct Z-scheme mechanism under UV–vis light irradiation. The trapping experiment indicates that oxidative radicals including •OH, h + , and •O 2 − play crucial roles in the photodegradation process. The outstanding photodegradation capacity is ascribed to spatially separated charge carriers, fast-charge transportation characteristic, and special bandgap structure of the Bi 2 O 3 /In 2 O 3 heterojunction. The introduction of H + and OH − ions into the reaction system promotes the formation of •OH and •O 2 − radicals, significantly enhancing the photodegradation rate of RhB. This study presents a new insight into the construction of the Z-scheme Bi 2 O 3 /In 2 O 3 heterojunction photocatalyst with potential application in wastewater treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Wang Cao,Caiyun Jiang,Chen Chen,HaiFei Zhou,Yuping Wang
The novel Z-scheme CdS/Bi 4 O 5 Br 2 heterostructure was successfully synthesized by a simple mixed-solvent thermal method. It proved that the Z-scheme CdS/Bi 4 O 5 Br 2 heterojunction was constructed by XRD , SEM, TEM and XPS. The synthesis of CdS nanospheres on ultra-thin Bi 4 O 5 Br 2 nanosheets to form a heterojunction interface was beneficial to the dispersion and transfer of the photogenerated electron–hole pairs, which was demonstrated by PL , i-t and EIS. UV-Vis diffuse reflectance spectra attested CdS/Bi 4 O 5 Br 2 heterojunction enhanced utilization of visible light. The Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction exhibited the highest photocatalytic performance for degradation process of CIP and TC than that of pure CdS and Bi 4 O 5 Br 2 . In addition, recycling tests declared that the Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction compared with single CdS had higher stability and durability, attributing to effectively alleviating photocorrosion of CdS. It could be seen from the trapping agent experiment that superoxide free radicals and hydroxyl free radicals were the main active substances. The possible photocatalytic mechanism of the Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction under visible light irradiation was proposed.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 14
·6524-6531
·
IF 11.301
Jiadong Li,Feng Wei,Changchang Dong,Wei Mu,Xiaojun Han
Indium oxide (In2O3)-based photocatalysts have great potential in photocatalytic CO2 reduction. Nevertheless, their photocatalytic activity is inhibited by rapid electron–hole recombination. Hence, a novel Z-scheme ternary hierarchical ZnFe2O4/RGO/In2O3 photocatalyst is fabricated for photocatalytic conversion of CO2 to CO and CH4. The CO production rate reaches up to 35.4 μmol g−1 under 4 h of illumination using a 20ZFO/10RGO/IO catalyst, which is 3.9 times and 9.8 times higher than those using bare In2O3 and bare ZnFe2O4, respectively. The CH4 production rate is 7.8 μmol g−1, which is 4.3 fold and 2.4 fold higher, respectively, compared to those from bare In2O3 and bare ZnFe2O4. The enhancement of photocatalytic CO2 reduction was ascribed to a Z-scheme mechanism of the hierarchical catalysts by introducing RGO in-between In2O3 and ZnFe2O4 to promote charge separation and realize efficient utilization of the high-energy electrons and holes. The oxygen-defect of ZnFe2O4 also facilitates the adsorption and activation of CO2. This work provides new insights to design ternary In2O3-based hierarchical photocatalysts with a rational Z-scheme photocatalytic mechanism to improve the CO2 conversion efficiency.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Chenlu Liu,Jingjing Xu,Junfeng Niu,Mindong Chen,Yonghui Zhou
This paper introduces a Z-scheme Ag 3 PO 4 /Bi 4 Ti 3 O 12 heterojunction composite photocatalyst prepared by an in-situ growth method. The photocatalytic properties of the prepared samples under visible light irradiation were studied by degrading sulfamethoxazole (SMX). The results of photocatalytic experiments and cycle experiments showed that Ag 3 PO 4 /Bi 4 Ti 3 O 12 -20% composite exhibited much better photocatalytic activity and stability than pure Ag 3 PO 4 and pure Bi 4 Ti 3 O 12 . The capture experiment results showed that h + is the main active substance in the process of SMX degradation. In addition, we proposed a possible photocatalytic mechanism based on the results of experiment and characterization. The formation of a direct Z-Scheme photocatalytic system promoted the separation of carriers, thereby improving the stability and activity of the composite samples.
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