Biosensors-Basel
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2022
·Vol. 13
·期 1
·7
·
IF 5.743
Huiping Fu,Ning Ding,Dan Ma,Qing Xu,Bingyong Lin,Bin Qiu,Zhenyu Lin,Longhua Guo
In this work, a simple, low-cost, green, and mild method for the preparation of three-dimensional nanocomposite materials of gold nanorods (Au NRs)@TiO2is reported. The surface of Au NRs was coated with TiO2in situ reduction at room temperature without a complicated operation. The synthetic Au NRs@TiO2nanocomposites were used as surface-enhanced Raman spectroscopy (SERS) active substrates for the reusable and sensitive detection of environmental pollutants. The results showed that the pollutants on Au NRs@TiO2nanocomposites have higher SERS activity and reproducibility than those on the Au NR substrate without the presence of TiO2. Moreover, the SERS substrate can be readily recycled by UV-assisted self-cleaning to remove residual analyte molecules. Malachite green (MG) and crystal violet (CV) were used as examples to demonstrate the feasibility of the proposed sensor for the sensitive detection of environmental pollutants. The results showed that the limit of detections (LODs) were 0.75 μg/L and 0.50 μg/L for MG and CV, respectively, with the recoveries ranging from 86.67% to 91.20% and 83.70% to 89.00%. Meanwhile, the SERS substrate can be easily regenerated by UV light irradiation. Our investigation revealed that within three cycles, the Au NRs@TiO2substrates still maintained the high SERS enhancement effect that they showed when first used for SERS detection. These results indicated that the method can be used to detect MG and CV in really complex samples. Due to the high sensitivity, reusability, and portability and the rapid detection property of the proposed sensor, it can have potential applications in the on-site detection of environmental pollutants in a complex sample matrix.Keywords:surface-enhanced Raman spectroscopy (SERS);self-cleaning;photocatalytic activity;recyclable;environmental pollutants
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Surfaces and Interfaces
·
2022
·
IF 6.137
Rumin Ma,Jingpeng Li,Shenjie Han,Zaixing Wu,Yongjie Bao,Sheng He,Yuhe Chen
In this study, different morphologies of WO 3 ⋅H 2 O/TiO 2 (WT) heterojunction films were successfully synthesized on bamboo biotemplate via facile two-step hydrothermal deposition methods. The WO 3 ·H 2 O self-assembled by nanosheets or nanoplates on anatase TiO 2 -coated bamboo (TiO 2 -B) exhibited a distinctive surface color. The addition of WO 3 ·H 2 O could significantly extend the optical responses of TiO 2 -B in the ultraviolet to the visible region. Based on the various analysis techniques, the formation mechanisms of the WO 3 ·H 2 O hierarchical architectures with different crystal structures were also proposed. In addition, the photoactivity and post illumination activity of WT films were examined by constructing ·O 2 ˉ and ·OH in light and in light-off, respectively. The results showed that WT films with different crystal structures exhibited different photoactivity and energy storage abilities, and the photoactivity of WT films was negatively correlated with their energy storage ability. The presence of an anatase TiO 2 thin film on the bamboo surface provided abundant active sites for WO 3 ·H 2 O growth, which formed direct S-scheme heterojunctions for solar energy conversion and storage. Therefore, we anticipate that solar-driven energy storage heterojunctions with accessible and rich crystal morphologies will provide new insights for various applications, such as efficient wastewater treatment , self-cleaning coating, and air purification.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Kun Li,Jin Qian,Peifang Wang,Chao Wang,Bianhe Lu,Wen Jin,Xixian He,Sijing Tang,Chao Zhang,Pan Gao
The effect of nanomaterials aging, namely the transformation of comprehensive characteristics after experiencing real or complex environmental behaviors, on their ecotoxicology is still lacking. Moreover, the mechanisms by which NPs influence biological phosphorus (P) removal during sewage treatment require further elucidation. Therefore, we used both pristine and aged anatase (TiO 2 -A) and rutile (TiO 2 -R) NPs to investigate the mechanisms by which NPs affect P removal in a SBR. At 0.1 mg/L, the four types of NPs (pristine and aged) had no significant effect on sludge purification after acute (72-h) exposure under simulated sunlight. However, at 50 mg/L—regardless of the crystalline phase of the NPs—SOP and COD removal efficiency dropped steeply to approximately 42.2–82.4 % (p < 0.05) and 69.8–83.3 % (p < 0.05), respectively, especially in the pristine TiO 2 -NPs groups because of decrease of richness and diversity of genus level of PAOs and enzyme activity of both PPK and PPX, and the sluggish transformation of PHA and glycogen. Aging reduced the ability of NPs toxicity. The toxicity mechanisms of TiO 2 -NPs included lipid peroxidation and contact damage, or leakage from bacterial cytoplasmic membrane, which are closely related to photooxidation capacity and aqueous solution stability—i.e., nanoscale effects—and the impacts of aging or inclusion.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 68
·期 1
·121-127
·
IF 1.66
Song Chen-lu,Wang Ju,Zeng Meng-long,Zhu Jian-qiang,Liu Yong,Xu Gang,Han Gao-rong
Fluorine-doped TiO 2 thin films featuring columnar structure were prepared on fluorine-doped tin oxide (SnO 2 :F) substrate using a sol–gel method. The F doping ratios were varied in the range of 0–8 %. The effect of [F]/[Ti + F] ratio on the structural, morphological, optical, photocatalytic and low-emissivity properties has been investigated in detail. X-ray diffraction studies revealed that all the composited films are mainly composed of anatase TiO 2 and rutile SnO 2 without other phases. The prepared TiO 2 :F films possessed the columnar morphology with the single layer thickness ranging from 28 to 31 nm. The best photocatalytic activity was obtained for the films with 4 % F doping ratio which is mainly attributed to the highest crystallization and crystallite size. The transmission and hemispherical emissivity of the composite films could still reach approximately 70 % and 0.20, which match the requirements of the Chinese National Standard (GB/T18915.2-2002), promoting the films for the practical applications.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 41
·期 10
·7785-7797
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IF 1.221
Zhou Shuolin,Xu Qiong,Xiao Jiafu,Zhong Wenzhou,Yu Ningya,Kirk Steven Robert,Shu Tao,Yin Dulin
Dimethyl toluene-2,4-dicarbamate (2,4-TDC) was selected as a model compound for aromatic polyurethane to investigate the photo-chemical behavior of commercial TiO 2 pigments in non-aqueous solution. The UV–Visible spectrometry analysis results showed that the UV-shielding ability of the rutile TiO 2 pigment was better than that of the anatase TiO 2 pigment. Photodegradation experiments suggested that the photodegradation of 2,4-TDC was retarded by rutile TiO 2 pigment, while accelerated by anatase TiO 2 pigment. With the help of the degradation intermediates during the photodegradation process and calculated data, such as point charges and bond length, the preliminary photodegradation mechanism of 2,4-TDC was also briefly elucidated, including the addition of hydroxyl radicals and the cleavage of the carbamate side chain. Additionally, the photodegradation of 2,4-TDC was used to evaluate the photoreactivity of TiO 2 pigments, this is proved to an efficient approach with potential application in industry.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2016
·Vol. 122
·期 7
·1-10
·
IF 1.444
Du Chun,Zhou Jiangshan,Li Fangzhou,Li Wei,Wang Yinzhen,He Qinyu
A facile and low-cost microwave method was used to prepare C and N co-doped TiO 2 in just 8 min. The prepared samples were thoroughly characterized and were found to have favourable features such as surface adsorption of pollutants and photocatalysis. The rapid decomposition of CH 5 N 3 HCl under microwave irradiation led to mesopores and surface roughness in the as-prepared particles, resulting in large surface adsorption of pollutant and good photodegradation. The best sample is the one with the ratio of TiO 2 /CH 2 N 3 HCl at 3:1, which adsorbed 86.3 % of a methylene orange (MO) solution (20 mg L −1 ) in 10 min.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 30
·期 1
·212-220
·
IF 2.324
Hu Zhen,Zhao Li,Guo Haiyong,Wang Shimin,Li Wenlu,Yang Xiaojie,Dong Binghai,Wan Li
A novel composite double-layer film was developed using TiO 2 /La(OH) 3 :Yb 3+ /Er 3+ nanoparticles (P25/UC) and porous-hollow TiO 2 microspheres (PHTS) for highly efficient dye-sensitized solar cells (DSSCs). P25/UC was used as the first layer and coated onto fluorine-doped tin oxide glass substrate to create a good contact and upconversion effect. The P25/UC layer can absorb and convert infrared light into visible red and green light, increasing light utilization. PHTS has a large size and a high specific surface area, was deposited onto the surface of the P25/UC film to improve the light scattering performance and dye adsorption of solar cells. The P25/UC composite double-layer film (P25/UC + PHTS) achieved the highest short-circuit current density of 20.33 mA/cm 2 and photoelectron conversion efficiency of 8.89% due to the synergistic effect of the upconversion layers and light-scattering layers, which increased by 51.26% and 38.04% compared with that of the pure P25 film photoelectrode.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhen Hu,Li Zhao,Wenlu Li,Shimin Wang,Binghai Dong
A composite film was prepared by mixing NaLuF 4 :Yb 3+ /Er 3+ up-conversion luminescent material with commercial P25, and a scattering layer composed of flower-like TiO 2 was added on to the composite film (UC/P25) to form a double-layer composite film (UC/P25 + FT). An AgNO 3 solution was irradiated by ultraviolet light to deposit nano-Ag particles on the prepared double-layer film, and a nano-Ag modified double-layer film (UC/P25 + FT + Ag) was finally obtained. The synergistic effect of the three improved methods conferred the UC/P25 + FT + Ag film with a wide spectral absorption range, strong light-scattering ability, and strong light absorption capability, which greatly improved the photoelectric performance of the film. The maximum photoelectron conversion efficiency of dye-sensitized solar cells with the UC/P25 + FT + Ag photoanode reached up to 8.14%, which increased by 32.36% compared with that of the pure P25 film photoelectrode .
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RSC Advances
·
2024
·Vol. 14
·期 37
·27310-27322
·
IF 3.9
Zhengjian Hou,Ke Wu,Huijie Wei,Hua Chi,Yanyan Xi,Lishuang Ma,Xufeng Lin
In this study, two series of samples (rT-Pt/TiO2 prepared with a hydrogen pretreatment and Tr-Pt/TiO2 prepared with an oxygen pretreatment) were prepared by treating commercial TiO2 supports in different atmospheres to establish different TiO2 interfacial structures, followed by the addition of platinum nanoparticles (NPs) for the catalyzed hydrogenation/dehydrogenation cycle of N-ethylcarbazole (NEC). The kinetic analysis and reaction mechanism were investigated by combining XRD, Raman, CO-DRIFT, HRTEM, XPS, H2-TPD and DFT calculations. It was found that the performance of the samples for the NEC system's cyclic hydrogen storage could be modulated by treating the TiO2 interfacial structure with different atmospheres varying the extent of strong metal-support interaction (SMSI). In addition, a turnover frequency (TOF) of 191.52 min−1 for dehydrogenation was achieved at 170 °C, which is better than the previously reported catalysts. Experimental studies (characterization and kinetic studies) and DFT calculations confirmed that the SMSI of the Tr-Pt/TiO2 series samples promoted the escape of H2 and enhanced the catalytic activity for 4H-NEC in the 12H-NEC dehydrogenation reaction. In the NEC hydrogenation reaction, the rT-Pt/TiO2 series samples were pretreated with H2 before loading platinum metal, which led to the early activation of Ti4+ in their carriers, and thus suppressed the SMSI effect of the reduction process after loading platinum. This process caused the interface formed by rT-Pt/TiO2 to have a higher energy barrier to 6H-NEC, which is an intermediate product of the NEC hydrogenation process, and this interrupted the hydrogenation process of 6H-NEC.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Wei Han,Xin Ge,Jili Yuan,Ronglan Pan,Yao Yang,Guanglong Zou,Haibo Xie
Nitrate (NO 3 − ) Electroreduction to produce NH 3 offers an alternative approach to sustainable production of NH 3 . Yet it remains challenging to simultaneously improve the adsorption and enrichment of low-concentration NO 3 − . Here, bundles of CuO x microneedles on TiO 2 nanotubes (NTs) were developed by a spatial-confined electrodeposition strategy, achieving 87.7 % or 98.4 % NH 3 FE at −0.25 V or −0.45 V vs RHE in 2 or 10 mM NO 3 − electrolytes, respectively. Both in-situ spectroscopy and finite element analysis simulation demonstrated that CuO x microneedle bundles and its interface between TiO 2 NTs not only greatly improve the enrichment of low concentration NO 3 − and its derived-NO 2 − and the diffusion of NH 3 product, but also enhance the adsorption of NO 2 − and H 2 O to facilitate the hydrodeoxygenation of NO 3 − as well as inhibit hydrogen evolution reaction competition. This work will provide a promising avenue to develop electrocatalysts to realize efficient catalytic conversion of reactants at low concentrations.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Bowen Li,Zhen Zhang,Tingfeng Shan,Qi Zhang,Yusi He,Xiangfu Wang,Hongmin Yang
The by-product SO 3 , generated by the conventional catalyst V 2 O 5 -WO 3 /TiO 2 employed in selective catalytic reduction (SCR) systems, has garnered attention in pollution control efforts. Studies on existing control have predominantly concentrated on the tail gas section, with insufficient understanding of in-situ suppression theories and methods at the source of SO 3 generation. We propose for the first time the introduction of low-valence reduced sulfur to synthesize a novel SCR catalyst, V 2 O 5 -WS 2 /TiO 2 , which elucidates the remarkable effect and in-situ mechanism of action in inhibiting SO 3 formation at its source. Compared to conventional catalysts, the new catalysts showed enhanced SO 3 inhibition, particularly at 350 °C, where SO 3 production was 64.1 % and 33.9 % lower than that with VTi and VW/Ti catalysts, respectively. This was due to their reduced surface area, smaller pore volume, and fewer alkaline sites, which hindered SO 2 adsorption and oxidation. The results revealed that S 2− on the catalyst surface reacts with V 5+ , reducing it to V 4+ and V 3+ . This reaction hinders the interaction between V 5+ -OH and adsorbed SO 2 , thereby reducing the formation of VOSO 4 intermediates. Furthermore, the W S bond in WS 2 impedes the formation of intermediate HSO 4 − , and the reduction of these intermediates ultimately leads to a decrease in SO 3 generation. Additionally, the incompletely depleted S 2− reacts with the final SO 3 produced, forming SO 2 and SO 4 2− , which further decreases the SO 3 generation rate and supports the maintenance of a reduced state on the catalyst surface. It is evident that low-valence reduced sulfur plays a crucial role in inhibiting SO 3 generation.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Bingxin Zhang,Yantao Song,Xu Cao,Zhenyu Cui
In this work, the method of “vacuum filtration-physical adhesion” is used to uniformly load TiO 2 nanoparticles on the polymer membrane surface to form a continuous and uniform TiO 2 nanoparticle coating layer. Two distinct PVDF/SMA@TiO 2 hybrid membranes featuring diverse surface microstructures were prepared. The oil fouling resistance of the two membranes and their influence on oil droplet adsorption behavior were examined. The results indicated that introduction of TiO 2 nanoparticles imparts the membrane surface with a nano-rough structure while ensuring superhydrophilicity, features that inhibit oil droplet adhesion. The membrane achieved a flux recovery rate of 97.12 % and an oil removal efficiency of 98.9 %, demonstrating superior anti-fouling and separation capabilities. At the same time, the multiple synergistic mechanisms including a hydrophilic layer formed by continuous TiO 2 nanoparticles, low surface roughness, rigid structure of nanoparticles and electrostatic interaction effectively destroy the surface charge of the surfactant stabilized oil droplets, which results in the coalescence of small-size emulsion oil droplet into large-size oil droplet with less surfactant and relatively weak charge. Finally, the interfacial interaction at the oil droplet-membrane interface is attenuated. Based on these, the anti-fouling mechanism of “cooperative repulsion-charge weakening” was proposed. This research offers a theoretical foundation for designing high-performance hybrid membranes for oil-water separation.
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