APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2023
·Vol. 129
·期 8
·1-8
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IF 2.7
Cui Hongshan,Hu Lifang,Zhu Jichao,Wang Liping,He Jie
Ethyl mercaptan is a typical volatile pollutant with strong irritating odor and very low olfactory threshold. A small amount of exhaust emissions will cause a very bad impact on the surrounding environment and human health. A novel Fe 2 O 3 -loaded ZnTi-layered double hydroxide (Fe 2 O 3 –ZnTi-LDH) photocatalytic material was prepared by hydrothermal method. The physical and chemical properties of Fe 2 O 3 –ZnTi-LDH and its corresponding precursors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (ATR, FT-IR), X-ray photoelectron spectroscopy (XPS), and N 2 adsorption–desorption measurements, Ultraviolet–visible diffuse reflection spectrum (UV–vis DRS), and Mott–Schottky (MS) method. The photocatalytic performance of the material is evaluated under a static condition. The results show that the uniform distribution of Fe 2 O 3 on ZnTi-LDH improves the photocatalytic efficiency of the Fe 2 O 3 –ZnTi-LDH. At the same time, the interaction between the Fe 2 O 3 and the ZnTi-LDHs further enhances the catalytic stability of the Fe 2 O 3 –ZnTi-LDH. The results also show a significant synergistic effect between Fe 2 O 3 and ZnTi-LDH. Fe 2 O 3 –ZnTi-LDH provides a new catalyst structure for photocatalytic conversion of ethyl mercaptan and a new research idea for the treatment of ethyl mercaptan.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Junhua Zou,Zhitong Wang,Wei Guo,Binbin Guo,Yan Yu,Ling Wu
ZnTi-LDH nanosheets have been synthesized as photocatalysts for selective oxidation of benzyl alcohol (BA) to benzaldehyde (BAD) under visible light irradiation. Based on UV–vis DRS, in-situ FTIR and XPS results, it was revealed that BA would be efficiently chemisorbed and activated on ZnTi-LDH forming the surface coordination species, which contributed to harvesting visible light and induced the photocatalytic reaction. The ESR spectra suggested that oxygen vacancies would be produced in ZnTi-LDHs after the adsorption of BA molecules. More exposed surface OH groups would induce more oxygen vacancies, which would serve as the centers for capturing photoelectrons from the photoexcited surface coordination species and act as active sites for enhanced O 2 adsorption and activation, resulting outstanding photocatalytic activity. Finally, a possible mechanism was proposed to illustrate the photocatalytic process which mediated by surface coordination species formed by the interaction between ZnTi-LDH and BA.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Yue Pan,Haonan Hu,Hongyi Tang,Chunyan Huang,Hao Ma,Wei Xu,Ruimei Fang,Wenyan Xiao,Fan Dong
Surface defect engineering has been regarded as an appealing strategy to improve photocatalytic performance, but defects are susceptible to inactivation and thus lose their function as active sites. In this study, we successfully tailored and identified the dynamic evolution of surface hydroxyl defects over ZnTi-layered double hydroxide (ZnTi-LDH) photocatalyst. The enrichment of surface hydroxyl electrons and the dynamic circulation of hydroxyl defects result in enhanced separation and transport capabilities of photogenerated carriers, thereby ensuring the perpetual activation of small molecules into •O 2 − and •OH. The optimized structure has demonstrated NO removal efficiency values as high as 70.0 %, while concurrently suppressing the emission of NO 2 — a dangerous byproduct. Furthermore, ZnTi-LDH exhibits remarkable adaptability to varying environmental conditions and satisfactory durability over extended periods of reaction. This research offers valuable insights into the key role of surface hydroxyl in sustainable NOx removal technologies, and the findings contribute significantly to the advancement of environmental remediations.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Cheng Liu,Mengning Chen,Yingzhang Shi,Zhiwen Wang,Wei Guo,Sen Lin,Jinhong Bi,Ling Wu
Two ultrathin ZnTi-LDH nanosheets with different thickness (1.4 and 4.0 nm) were prepared to study the interplay between the active site and catalytic performance in photocatalytic synthesis of N -benzylideneanilline via a tandem reaction. ZnTi-LDH nanosheet possesses dual isolated active sites including the coordinatively unsaturated Ti atoms (Lewis acid sites) and the H atoms of OH groups (Brönsted acid sites), achieving the activation of benzyl alcohol and nitrobenzene via C–O···Ti species and N–O···H–O species, respectively. Photogenerated holes and electrons facilitate the oxidation of benzyl alcohol to benzaldehyde and the reduction of nitrobenzene to aniline, respectively. The thinner sample possesses more active sites, facilitating not only the activation of reactants but also the separation of photogenerated carriers. Therefore, a thinner ZnTi-LDH nanosheet shows the high conversion (100%) and the high selectivity (96%). Finally, a synergetic photocatalytic mechanism connected to the molecular activation is illustrated at the molecule level.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Zhengfeng Shen,Peng jingjing,Jianxin Liu,Yawen Wang,Yunfang Wang,Zhongde Wang,Caimei Fan,Rui Li,Jiancheng Wang
The highly selective photocatalytic oxidation of methane (CH 4 ) to oxygenates remains challenging due to over-oxidation and low efficiency. Herein, a series of chromate-intercalated ZnTi-layered double hydroxide (CrO 4 2- -ZnTi-LDH, CZT-x) photocatalysts were constructed via a combined hydrothermal and anion-exchange method. Under simulated solar irradiation, the optimized CZT-30 catalyst achieves a remarkable oxygenates production rate of 2603.60 μmol·g -1 ·h -1 , which is 1.67 times higher than that of the pristine ZnTi-LDH, with nearly 100% selectivity. This high selectivity (>92%) is well maintained over a 9-hour duration. Structural and spectroscopic analyses reveal that the intercalated CrO 4 2- anions not only modulate the interlayer microenvironment and host electronic structure but also enhance light absorption and charge separation efficiency. In-situ EPR and Raman spectroscopy revealed that the CrO 4 2- intercalation serves a dual function: it selectively boosts the generation of the key *OOH intermediate and enhances the hole-mediated activation of *CH 4 to *CH 3 . This synergistic effect promotes the coupling of *CH 3 and *OOH, leading to the highly selective production of oxygenates. This work provides a strategy for designing efficient LDH photocatalysts for selective methane valorization.
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高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2025
·Vol. 103
·期 1
·102321
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IF 3.4
Juan Wang
Environmental discharge of antibiotics and dyes poses serious threats to human survival and development. In this study, sheet‐like ZnTi‐layered double hydroxide (ZnTi‐LDH) photocatalysts were rapidly synthesized via hydrothermal method at varying reaction temperatures. With increasing hydrothermal temperature, the formation of ZnTi‐LDH became more pronounced, and its photocatalytic performance was assessed using tetracycline hydrochloride (TCH) and Congo red (CR) as model contaminants. The photocatalytic performance of ZnTi-LDH prepared at 210 °C after 60 min of light exposure was optimal, with degradation degree of TCH and CR reaching 84.20 % and 62.75 %, respectively. Similarly, the corresponding first-order reaction rate constants are also the highest, at 0.021 min −1 and 0.010 min −1 , respectively. Mott–Schottky analysis, optical property analysis and electrochemical property analysis combined were conducted to elucidate the photodegradation mechanisms of TCH and CR on ZnTi‐LDH. Reactive‐species trapping experiments confirmed that photogenerated electrons primarily generate superoxide radicals through electron transfer rather than forming singlet oxygen via energy transfer.
研究领域:
环境化学
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材料科学
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光催化
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污染物降解
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纳米材料
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Chaowei Luo,Jie Xiong,Hongyan Zeng,Mengchen Liao
Heterointerface engineering is an effective strategy to design and construct high-performance photocatalysts. Herein, polyaniline (PANI) nanoparticles and ZnTi layered double hydroxide (ZnTi-LDH) nanosheets were integrated to form organic–inorganic heterostructure (PANI/LDH) via d – π electronic coupling using in-situ polymerization for photocatalytic oxidation/reduction towards tetracycline (TC) and Cr(VI). The photocatalytic activity was closely related to feed amount of aniline (Ani) in the polymerization process, which the abundant PANI nanoparticles were evenly distributed on the surface of ZnTi-LDH nanosheets at the proper Ani feed amount, and thus reinforced d –π electronic coupling at the organic–inorganic interfaces more efficiently. Density functional theory calculations further verified the existence of d –π overlap at the PANI/LDH heterointerface. The strong d –π coupling boosted charge separation and transfer to improve photocatalytic efficiency. As a result, the optimal PANI/LDH (0.3) exhibited outstanding photocatalytic activities with 97.8 % Cr(VI) reducing rate and 87.8 % TC removal rate in the single Cr(VI) and TC system, as well as high simultaneous removal rate of Cr(VI) and TC in TC/Cr(VI) coexistence system, respectively. Subsequently, the photocatalytic enhanced mechanisms were put forward to remove Cr(VI) and TC under visible-light. Finally, the aquatic toxicity of the photolytic products was evaluated using Chlorella sp. as an ecological indicator, showing that the PANI/LDH had a notable detoxification efficiency of TC and Cr(VI).
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Kai-Qiang Jing,Yu-Qing Fu,Zhe-Ning Chen,Teng Zhang,Jing Sun,Zhong-Ning Xu,Guo-Cong Guo
Strong metal–support interaction is crucial to the stability of catalysts in heterogeneous catalysis. However, reports on boosting interfacial electron transfer between metal and support via defect induction for enhanced metal–support interaction are limited. In this work, ultrathin reducible ZnTi-layered double hydroxide (LDH) nanosheets with rich oxygen defects were synthesized to stabilize Pd clusters, and the rich oxygen defects promoted Pd cluster bonding with Zn and Ti atoms in supports, thereby forming a metal–metal bond. Electron spin resonance (ESR), X-ray absorption fine spectra (XAFS), and density functional theory (DFT) calculations demonstrate remarkable interfacial electron transfer (0.62 e). The Pd/ZnTi-LDH catalyst shows superior catalytic stability for CO direct esterification to dimethyl oxalate. By contrast, the nonreducible Pd/ZnAl-LDH catalyst with a few oxygen defects shows minimal interfacial electron transfer (0.08 e), which leads to relatively poor catalytic stability. This work provides a deep insight into promoting the stability of catalysts by boosting interfacial electron transfer via defect induction.
研究领域:
催化化学
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材料科学
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理论计算
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DOI
PubMed
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2023
·
IF 3.9
Yifei Li,Shimin Hou,Yue Zhang,Zanhong Wang,Chaihui Wei,Haitao Li
This study proposed a one-step preparation method for ZnTi-layered double hydroxide (ZnTi-LDH)/reduced graphene oxide (rGO) nanosheet hybrids in a supercritical ethanol system. After treating pristine ZnTi-LDH and rGO in the supercritical state of ethanol (268 °C, 10 MPa) for 1 h, nanocomposites composed of LDH nanosheets (7–10 nm in thickness) and rGO were obtained. Based on the conversion of ethanol between supercritical and conventional states, this method achieves the exfoliation of LHD nanosheets and reassembly with rGO in one step. This method promotes the generation of oxygen vacancies (OVs) favorable for electron-hole pair separation on the LDH/rGO surface. In the photocatalytic degradation of organic dyes, the degradation rate constants of LDH/rGO composites for Rhb and AO7 are 2.9 and 3.3 times that of pristine LDH, respectively. The enhanced photocatalytic activity was attributed to the OVs on the LDH/rGO surface, the positively charged LDH nanosheets, and the electrical conductivity of rGO.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
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