Water
·
2025
·Vol. 17
·期 2
·161
·
IF 3
Nan Xiong,Yansen Guo,Yanyan Nie,Yuqing Yao,Zhemian Ying,Wei Zhang,Renduo Liu,Xiaoling Wu,He Zhou,Limin Zhou,Ying Wang,Jian He,Long Yan
As a well-known photocatalyst, TiO2still suffers from rapid electron–hole recombination and limited visible light absorption. To overcome these challenges, the combination of graphene and TiO2has been proposed. However, traditional methods such as ball milling and hydrothermal synthesis face limitations, including high energy consumption and complex procedures. Here, we develop a simple and industrially feasible method to prepare reduced graphene oxide (rGO)-coated TiO2nanoparticles, referred to as rGO-TiO2composites. The optimized rGO-TiO2composites exhibit an enhanced photocatalytic degradation of rhodamine B (RhB) under simulated sunlight conditions, about 99.95% for 4% rGO-TiO2within 80 min. The first-order reaction rate constant (k) of 4% rGO-TiO2(0.0867 min−1) is 5.42 times higher than that of nano TiO2(0.0135 min−1). The key reactive species involved in the degradation process are identified. Additionally, the effects of pH and NaCl concentration on the degradation efficiency of rGO-TiO2are also investigated. The 4% rGO-TiO2composite exhibits an excellent photocatalytic activity within the pH range of 3.87–11.89, and the NaCl concentration does not affect its photocatalytic efficiency. After characterization, the enhanced photocatalytic activity is ascribed to the introduction of rGO and the generation of surface oxygen vacancies (OV) and Ti3+in TiO2crystals.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Jie Yu,Yuan Zhang,Jiahao Chen,Lele Cui,Wenheng Jing
A solvothermal-induced assembly of a 2D-2D reduced graphene oxide (rGO)-TiO 2 mesoporous material with a laminar structure for membrane construction is reported, in which using 2D-2D rGO-TiO 2 as building blocks can preeminently enhance the separation properties of the as-prepared membrane without sacrificing the permeance. Taking advantage of the large specific surface area (324 m 2 /g) available for interfacial effects as well as interwoven stacking and narrow layer spacing of 2D morphologies for size exclusion, the fresh rGO-TiO 2 membrane exhibited excellent separation performance toward organic dye from water (>97.3% for Rhodamine B, Methyl orange, Methyl blue and Congo red), while achieving good permeance up to approximately 9.36 L m −2 h −1 bar −1 and an outstanding structural stability under the cross-flow process of filtration. More importantly, the reduced band gap energy (Eg) of 2D-2D rGO-TiO 2 membrane layer (2.77 eV) compared with that of the blank TiO 2 membrane (3.24 eV) allows the rGO-TiO 2 membrane to have an impressive self-cleaning ability and thus exhibits great potential application in the field of membrane separation .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 6
·935-945
·
IF 4.036
Jiantao Feng,Yechen Wang,Yanhui Hou,Liangchao Li
A series of yolk–shell ZnFe2O4@reduced graphite oxide@TiO2 (ZFO@RGO@TiO2) microspheres with different void sizes and TiO2 shell thicknesses has been successfully synthesized by combining a layer-by-layer coating process and chemical etching route. Compared to pure ZFO and hierarchical ZFO@SiO2@RGO@TiO2, the as-synthesized yolk–shell microspheres exhibited significantly enhanced microwave absorption properties in terms of effective bandwidth and reflection loss. Among these, the minimum reflection loss of the as-synthesized yolk–shell microspheres with a thickness of 2.6 mm could reach up to −44.3 dB at 15.92 GHz, and their effective absorption bandwidth at less than −10 dB was 4.1 GHz. In addition, as the shell thickness of the yolk–shell microspheres decreased, the frequency corresponding to the minimum reflection loss shifted to the high-frequency range. Hence, these obtained yolk–shell microspheres are potential new candidates for high-frequency shielding and lightweight microwave absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 22
·2954
·
IF 5.3
Suyi Zhao,Zhenzeng Chong,Xiaogang Zuo,Wenjun Qi
For environmental remediation, it is significant to design membranes with good mechanical properties and excellent photocatalytic activity. In this work, RGO/TiO2membranes with heterogeneous structures and good photocatalytic efficiency were synthesized using the method of electrospinning combined with a thermal treatment process. In the binary nanocomposites, RGO was tightly adhered to TiO2fibers and by simply adjusting the loading of RGO, the strength and modulus of the fibrous membranes were improved. Notably, the RGO-permeated TiO2fibers exhibited 1.41 MPa in tensile strength and 140.02 MPa in Young’s modulus, which were 705% and 343% of the original TiO2fibers, respectively. Benefiting from the enhanced light response and the homogeneous and compact heterogeneous structure, the synthesized RGO/TiO2membranes displayed good antibacterial performance with a photocatalytic inactivation rate of 6 log againstE. coliwithin 60 min. This study offers a highly efficient alternative to inactivateE. colifor the synthesis of TiO2-based membranes.Keywords:RGO/TiO2;nanomembrane;photocatalytic;sterilization
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Lu Xin-Yang,Li Jing,Kong Fen-Ying,Wei Mei-Jie,Zhang Pei,Li Ying,Fang Hai-Lin,Wang Wei
An electrochemical sensor for sensitive sensing of acyclovir (ACV) was designed by using the reduced graphene oxide–TiO2–Au nanocomposite-modified glassy carbon electrode (rGO–TiO2–Au/GCE). Transmission electron microscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy were used to confirm morphology, structure, and composition properties of the rGO–TiO2–Au nanocomposites. Cyclic voltammetry and linear sweep voltammetry were used to demonstrate the analytical performance of the rGO–TiO2–Au/GCE for ACV. As a result, rGO–TiO2–Au/GCE exerted the best response for the oxidation of ACV under the pH of 6.0 PB solution, accumulation time of 80 s at open-circuit, and modifier amount of 7 µl. The oxidation peak currents of ACV increased linearly with its concentration in the range of 1–100 µM, and the detection limit was calculated to be 0.3 µM (S/N = 3). The determination of ACV concentrations in tablet samples also demonstrated satisfactory results.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Kexin Chen,Xi Wang,Pengfei Xia,Jinxin Xie,Jing Wang,Xukai Li,Yiming Tang,Laisheng Li
Z-scheme Cu 2 O-(rGO-TiO 2 ) photocatalyst was successfully synthesized via a simple three-step approach for 2,2′,4,4′-tretrabromodiphenyl ether (BDE47) reductive removal under simulated solar irradiation. Unlike the traditional heterojunction , the addition of reduced graphene oxide (rGO) enhanced the redox ability of Cu 2 O-TiO 2 by increasing charge transfer. When modifying Cu 2 O films by adding 1% rGO and coating with 70% TiO 2 , the resulting Cu 2 O-(rGO-TiO 2 ) exhibited the best photocatalytic activity for BDE47 removal. The charge transfers of Cu 2 O-(rGO-TiO 2 ) were proven to follow a Z-scheme pathway through the electron paramagnetic resonance analysis. The degradation pathways of BDE47 were elucidated by identifying intermediate products via gas chromatography-mass spectrometry (GC-MS) and gas chromatography (GC). Photo-electrons (e − ) generated from the conduction band of Cu 2 O and hydrogen protons (H 0 ) reduced from H + in water were the main contributing elements for the removal of BDE47, which response to the ortho and para debromination . Ortho-Br of BDE47 was attacked by e − and BDE28 was the dominant debromination product on the first stage. Then e − and H 0 attacked ortho-Br and para-Br of BDE28 to form BDE15 and BDE8, respectively. The concentration of BDE8 was higher than that of BDE15, suggesting that H 0 played the most important role on the second debromination stage. An effective Cu 2 O-(rGO-TiO 2 )-based Z-scheme system for BDE47 debromination was proposed in this study, which may contribute to the development of novel green technologies.
研究领域:
环境科学
·
光催化化学
·
环境污染与控制
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材料科学
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绿色技术
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有机污染物降解
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2019
·Vol. 21
·期 24
·12850-12858
·
IF 3.567
Xin Jiang,Qinqin Sang,Ming Yang,Juan Du,Weie Wang,Libin Yang,Xiaoxia Han,Bing Zhao
The exploitation of new types of non-metal surface-enhanced Raman scattering (SERS) substrates with high performances and the exploration of enhancement mechanisms are of vital importance for the development of the SERS technology due to its potential prospects in both the spectroscopy and material fields. Here, a magnetic SERS-active substrate hybridized by reduced graphene oxide (rGO), TiO2 and Fe3O4 (rGO–TiO2–Fe3O4) was successfully prepared via the combination of a simple sol-hydrothermal method and a co-precipitation method. The as-synthesized rGO–TiO2–Fe3O4 nanohybrid not only exhibited outstanding SERS detection ability with high sensitivity and spectral reproducibility, but also could be recycled with high stability based on its self-cleaning capacity and magnetism. Exploiting these features, it could be used for the SERS detection of 4-mercaptobenzoic acid (4-MBA), 4-mercaptopyridine (4-MPy), 6-mercaptopurine monohydrate (6-MP), 1,2-di(4-pyridyl) ethylene (BPE) and p-aminobenzoic acid (PABA) with the detection limits of 1.0 × 10−10, 1.0 × 10−8, 1.0 × 10−10, 1.0 × 10−10 and 1.0 × 10−9 mol L−1, respectively; these are the highest SERS sensitivity values among those reported for semiconductor substrates and are even lower than that of noble metal substrates. Meanwhile, an SERS enhancement mechanism from the synergistic effects of the rGO, TiO2 and Fe3O4 components was proposed to explain the observed considerable SERS enhancement on rGO–TiO2–Fe3O4.
研究领域:
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TEXTILE RESEARCH JOURNAL
·
2025
·
IF 1.9
Ruobing Yao,Yuting Xue,Cheng Zhang,Guangxian Zhang,Fang Xu,Yunxuan Weng
In order to protect the environment, it is very important to develop facile and repeatable methods to degrade organic pollutants in water. The reduced graphene oxide and (RGO) and titanium dioxide (TiO2)-functionalized polyethylene terephthalate (PET) fabrics (RGO-TiO2-PET) were facilely prepared using a one-step hydrothermal method. The RGO-TiO2-PET exhibited remarkable photodegradation efficiency and excellent recyclability. From the results, RGO enhanced the catalytic degradation of rhodamine B by RGO-TiO2-PET under visible light irradiation. The degradation of RhB catalyzed by TiO2-PET was 63.57% after 180 min of degradation under visible light irradiation, while it increased to 93.28% catalyzed by 5% RGO-TiO2-PET. Moreover, RGO-TiO2-functionalized PET fabric exhibited wonderful reusability, since its photocatalytic activity did not significantly decrease after five photocatalysis cycles. The significant enhancement of photocatalytic activity can be ascribed to the enhanced absorption of dyes and light, and charge transfer from the conduction band of TiO2 to the empty electronic states of RGO.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
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