JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Shuguo Yu,Hongyan Zhang,Jun Zhang,Ziyan Hu
Respiratory monitoring is an effective method to assess human health and provides valuable information for early warning and diagnosis of respiratory diseases. However, respiratory monitoring equipment relies on traditional power supply model, which limits real-time monitoring of breathing in fields of outdoor adventure, nomadism and long-distance running. As a solution, a triboelectric nanogenerator (TENG)-driven self-powered humidity sensor for human breath monitoring was prepared. A flexible TENG composed of Ti 3 C 2 T x : PDMS composite film and Ni/Cu polyurethane foam sponge was used as self-powered part of the device, RGO-TiO 2 humidity sensor was used as the respiratory sensing part of the device. Compared with the traditional humidity sensor, TENG-driven self-powered RGO-TiO 2 (TENG-RGTO) shows high response (359.2), fast response/recovery time (1/5.2 s), good reversibility, small humidity hysteresis (0.54%) in the range from 0% RH to 95% RH. Furthermore, TENG-RGTO humidity sensor can realize recognition of breathing states at different frequencies and intensities in real time. Meanwhile, a breathing alarm device driven by humans is designed. This research not only broadens the application range of TENG but also provides a new design idea for self-powered breathing monitoring sensor.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 36
·17188-17202
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IF 4.682
Ouyang Yuanyong,Zhang Zihao,Huang Wei,Yang Wenzhong,Shen Chuanlai,Chen Yun,Yin Xiaoshuang,Liu Ying
Fluorinated hydroxyapatite-titanium dioxide coating (F-doped HA-TiO 2 ) was deposited in situ onto AZ31 Mg alloy using electrodeposition method. XRD and EDS confirmed the crystal structure and composition of the coating. SEM images showed that the F-doped HA-TiO 2 coating on the surface of AZ31 Mg alloy was extremely uniform and the thickness of coating was reflected by the cross-sectional image. Corrosion behavior of the coating modified Mg alloy was tested by electrochemical and immersion experiments. Compared to the corrosion current density ( I corr ) of the uncoated AZ31 Mg alloy in Hank’s solution, the I corr of F-doped HA-TiO 2 coating was decreased almost 4 orders. The coated AZ31 Mg alloy showed superior biocompatibility, which was strongly demonstrated by the amounts of cells increased in cell culture. The results of hemolysis tests also illustrated that the F-doped HA-TiO 2 coating met the requirements of biomedical materials.
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APPLIED THERMAL ENGINEERING
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2022
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IF 6.465
Zhenghao Jin,Shuhong Li,Runfa Zhou,Mengkai Xu,Weixue Jiang,Kai Du
Adding nanoparticles can enhance the mass and heat transfer of basic fluid, improving the coefficient of performance(COP) of the absorption refrigeration system(ARS). However, there are few experimental studies on the effects of absorption pressure and temperature on the absorption performance of nanofluid in an actual ARS. Therefore, the TiO 2 nanoparticles are added to the NH 3 - H 2 O – LiBr working fluid. The difference in ammonia mass fraction between the inlet and outlet solution of the absorber (Δ ε ' a ) is compared with when the solution is absorbed saturated (Δ ε a ). The results indicate that the Δ ε ' a and system COP increase when the absorption temperature decreases, the absorption pressure increases, or the TiO 2 mass fraction increases. The ratio Δ ε ' a /Δ ε a is used to evaluate the absorption efficiency of the nanofluid. The positive effects of nanofluid on the absorption efficiency and COP slightly increase when absorption temperature increases, but decrease when the absorption pressure is greater than 0.31 MPa. For all of our test groups, the greatest improvement in absorption efficiency is 85 %, and the largest improvement in COP is 13.7 %.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Guizhen Zhang,Yingying Yu,Yi Tu,Yang Liu,Jintao Huang,Xiaochun Yin,Yanhong Feng
A photocatalytic membrane reactor is an effective method to degrade organic pollutants in water and air. This method has many advantages, such as a complete degradation of organic pollutants, no secondary pollution to the environment, environmental protection, and high efficiency. Thus, how to efficiently manufacture membrane reactors with high catalytic efficiency is essential. In this study, ultra-high molecular weight polyethylene (UHMWPE)/inorganic particle photocatalytic microporous membrane reactors with high porosity and high loading capacity were prepared using a melt-blending method. In the preparation process, UHMWPE, liquid paraffin (LP), and nanoparticles, which acted as a binder, porogen, and photocatalyst, respectively, were completely dispersed and mixed in a self-developed pulsating tensile stress mixer. Then, the LP was extracted to obtain a microporous membrane reactor with high porosity and high loading of inorganic particles. This reactor had the advantages of excellent catalytic efficiency, industrial manufacture and application, recyclable and reusable, and environmental protection. In this study, inorganic titanium dioxide (TiO 2 ) nanoparticles were used as photocatalysts to prepare the microporous membrane reactor. The effects of the ratios of UHMWPE to LP, the contents and sizes of inorganic particles, the thickness of the membrane, and biaxial tension treatment on the structure of the membrane reactors and the catalytic efficiency of organic dyes and hormone pollutants in water were studied. Results showed that the photocatalytic microporous membrane reactor with 75% porosity and 80 wt% of TiO 2 had the best photocatalytic performance. Under ultraviolet photocatalysis, the degradation rate of the 20-mg/L methyl orange solution reached 98.5% within 60 min. Moreover, the degradation rate of the methylene blue solution reached 98.4% within 60 min, and that of the 20-mg/L Congo red solution reached 100% within 40 min. Furthermore, the degradation rate of the 50-mg/L tetracycline hydrochloride solution exceeded 96.6% within 80 min.
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高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Xiaojuan Bai,Shengqi Yang,Chaohong Tan,Tianqi Jia,Linlong Guo,Wei Song,MeiPeng Jian,Xiaoran Zhang,Ziyang Zhang,Liyuan Wu,Hua Yang,Haiyan Li,Derek Hao
As the value of TiO 2 in environmental protection continues to be explored, it has broad potential for stone building protection. However, the hydrophilicity of TiO 2 makes it challenging to keep stable on the exterior of buildings and hydroxyl radicals generated under UV irradiation may be harmful to substrates. Herein, TiO 2 was wrapped with the SiO 2 shell by a modified Stöber method and superhydrophobic TiO 2 was obtained by grafting methyl groups on the SiO 2 shell. The TiO 2 @Si–Me core-shell system were dispersed in Paraloid B72 and applied on marble surfaces to investigate the self-cleaning effect of TiO 2 on the substrate. The results showed that the superhydrophobic TiO 2 nanoparticles significantly enhanced the surface roughness , which was beneficial to transform the acrylic resin coating from hydrophilic to hydrophobic and retain the original vapor permeability. The adsorption rate and degradation efficiency of methylene blue of TiO 2 @Si–Me core-shell system were 2.19 and 1.45 times higher than that of pure TiO 2 . Furthermore, the superhydrophobic TiO 2 did not change the color of the stone after UV aging, which contributed to maintaining the appearance of buildings. These findings will help to understand the role of photocatalytic nanomaterials in developing protective layers for stone construction and expand the application in the self-cleaning of the architectural environment.
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Sustainable Energy & Fuels
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2022
·Vol. 6
·期 23
·5281-5289
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IF 6.813
Zhefei Zhao,Xingyu Luo,Jiaxi Peng,Siqi Wang,Tianyang Guo,Huajun Zheng
Electrocatalytic conversion of biomass-derived platform molecules is regarded as an emerging approach to obtain high-value fuels and chemicals. Herein, a heterostructured design strategy involving dispersed Ag nanoparticles immobilized on one-dimensional TiO2 nanotubes (Ag-TiO2 NTs) for the electroreduction of 5-hydroxymethylfurfural (HMF) into 2,5-dihydroxymethylfuran (DHMF) was reported. The optimal electrode exhibited an 82.2% FE, 89.8% selectivity, and DHMF productivity value of 0.1 mmol cm−2 h−1. Electrochemical measurements combined with density functional theory (DFT) calculations manifested that the superior performance was derived from the heterojunction-induced metal–semiconductor interactions at the interface, by which the TiO2 NTs and Ag bring complementary advantages inhibiting the hydrogen evolution reaction (HER) and facilitating charge transfer. Moreover, the catalytic activity of the Ag sites on Ag-TiO2 NTs was considered separately. The mass activity of Ag on Ag-TiO2 NTs reached 5.8 mol L−1 g−1, which was far more than that of Ag mesh (0.038 mol L−1 g−1), indicating the significantly enhanced activity of Ag with high utilization. This could be attributed to the controllable nucleation of Ag through the confinement effect of TiO2 NTs, acquiring dispersed Ag nanoparticles. The design scheme for the heterostructured Ag-TiO2 NTs electrocatalyst displays prospective applications for developing highly efficient electrocatalysts for the electrochemical reduction of HMF.
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Sustainability
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2022
·Vol. 14
·期 17
·10614
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IF 3.889
Anqi Wang,Wei Chen,Nannan Geng,Xiaomeng Lan,Mingxiang Liu,Xing Wu
Industrialization and urbanization have resulted in large volumes of municipal wastewater containing abundant refractory humic acid (HA), which is difficult to biodegrade with carcinogenic byproducts and has posed a great threat to human health. Photocatalysis is a promising advanced oxidation process (AOP) for the efficient degradation of HA. In this work, a novel three-step electrochemical method was employed to fabricate electrochemically converted N-doped TiO2nanotubes/graphene (ENTG) composite film. Compared with traditional hydrothermally synthesized N-doped TiO2/graphene (NTG) nanoparticles, the ENTG photocatalyst exhibited enhanced degradation performance, recyclability and stability. It was found that ETNG can extend the range of light absorption to over 400 nm and narrow the band gap to 2.7 eV. The degradation rate for HA was up to 92.3% under the optimum condition. The preparation mechanism for ENTG is based on an electrochemical reduction–deposition hypothesis, while the degradation mechanism is dependent on adsorption and free radical oxidation. According to a free radical quenching test, both •OH and •O2−radicals were produced, and •OH played the dominant role in HA degradation. In general, ENTG is a promising photocatalyst for further application in municipal wastewater treatment.Keywords:electrochemically fabricated;N-doped TiO2/graphene;photocatalytic degradation;humic acid;municipal wastewater treatment
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Mingtai Hou,Zeyi Jiang,Fuqiang Chu,Xinru Zhang,Nien-Chu Lai
Organic phase change materials (PCMs) promise remarkable latent heat storage capacity but suffer from weak visible-light absorption capability and ultralow thermal conductivity for harvesting and conversion of clean solar energy. Herein, we design and synthesize a new core@shell structured n-eicosane@TiO 2 /TiN composite microcapsules which can realize 98.08 % of thermal energy storage capacity. By making use of the localized surface plasmon resonance of high-thermal-conductivity TiN , the prepared composite microcapsules possess a remarkable photo-thermal conversion efficiency up to 78.4 %. Plasmonics TiN can not only efficiently adsorb visible light and convert the optical energy into heat but also enhance thermal conductivity of the composite microcapsules, resulting in ultra-low supercooling degree of 1.02 o C. In addition, the composite microcapsules exhibit excellent phase change reversibility and thermal durability during the 100-cyclic scans. Our work offers new insights into designing high-performance microcapsuled PCMs in solar thermal applications, bringing great potential for renewable energy utilization beyond traditional fossil energy sources.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Ming Xiao,Ruixue Li,Jinglin Yin,Junhui Yang,Xinyu Hu,Hongbo Xiao,Wenlei Wang,Ting Yang
The treatment of arsenite pollution in water has always been concerned. Oxidation of high toxic As(III) to relatively low toxic As(V) by efficient photocatalytic oxidation technology is a research hotspot. This paper is focused on the active photocatalyst of TiO 2 @Fe 3 O 4 composites synthesized by a simple hydrothermal method for the efficient photocatalytic oxidation of As(Ⅲ). The successful construction of Ti–O–Fe interface bonds between TiO 2 and Fe 3 O 4 significantly promoted the transfer efficiency of photo-generated carriers, and further rapidly improved the photocatalytic oxidation efficiency of As(Ⅲ). The application results showed that the constructed TiO 2 @Fe 3 O 4 photocatalyst with 0.10 g Fe 3 O 4 (TF-0.10) could complete the transformation from As(Ⅲ) (10,000 μg/L) to As(Ⅴ) within 4 min with a high oxidation ratio of 100% and maintained the good properties with unchanged crystal structure after five cycles. Furthermore, the photocatalytic properties of TiO 2 @Fe 3 O 4 composites were still stable under different pH values. Electron paramagnetic resonance (EPR) consequence displayed that the superoxide radical (‧O 2 — ) and hole (h + ) were the main intermediate product in the arsenic photocatalytic oxidation system, and hydroxyl radical (‧OH) had little effect on this oxidation system. The possible mechanism of As(Ⅲ) photocatalytic conversion was further explored based on the results of the data analysis. Furthermore, this work provides a potential new idea for the practicability of efficient photocatalytic arsenic oxidation.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Changkun Ding,Xiwen Qin,Yingying Tian,Bowen Cheng
We herein report novel polyethersulfone/graphene oxide@titanium dioxide (PES/GO@TiO 2 ) photocatalytic membranes developed via the layer-by-layer (LBL) self-assembly technique. The synergistic coupling of GO and TiO 2 could result in improved photocatalytic activity and endow the pristine PES membrane with photocatalytic function. Various techniques were adopted to characterize the structure and morphology of PES/GO@TiO 2 photocatalytic membranes, which indicated that GO@TiO 2 was successfully integrated in PES. Contact angle testing proved that the hydrophilicity of PES/GO@TiO 2 photocatalytic membranes was improved with the increase of self-assembled GO@TiO 2 layers. FTIR results indicated that GO@TiO 2 was attached to the pristine PES membrane surface through interfacial interactions in our experimental conditions. And both the thermal stability and mechanical stability of the pristine PES membrane were improved with the incorporation of GO@TiO 2 . Meanwhile, the optimized PES/GO@TiO 2 photocatalytic membranes exhibited a water flux up to 109.8 L/(m 2 h), more than 4 times that of pristine PES membrane, while kept high bovine serum albumin (BSA) rejection of 99.1%, and flux recovery ratio (FRR) of 86.1% in dark condition and the flux almost tripled after about 3 h of UV irradiation. Specially, the photocatalytic activity of PES/GO@TiO 2 photocatalytic membranes increased with an increase of self-assembled GO@TiO 2 layers. When the self-assembled layers of GO@TiO 2 were three, the membrane showed 95.1% of degradation against methylene blue (MB) dye under UV light irradiation. Thus, the prepared PES/GO@TiO 2 photocatalytic membranes can be suggested as an ideal candidate for photocatalytic templates in wastewater treatment .
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ANALYTICAL CHEMISTRY
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2022
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IF 8.008
Qianqian Zhao,Wenkai Zhu,Wenrong Cai,Junyao Li,Datong Wu,Yong Kong
Chiral analysis is of significant importance for living organisms since chirality is the fundamental phenomenon in nature. In this work, a bifunctional electrochemiluminescent (ECL) platform is constructed for chiral discrimination and chiral sensing. 3-Mercaptopropionic acid-functionalized CdSe quantum dots (CdSe QDs) are combined with aminated TiO2 nanotubes (NH2-TiNTs) via amidation. The resultant CdSe QDs/TiNTs display significantly enhanced ECL signals due to the synergistic effect between CdSe QDs and TiNTs, which are then used for the chiral discrimination of the isomers of nine chiral amino acids (AAs) in the presence of d-AA oxidase (DAAO). DAAO can selectively catalyze the oxidation of d-AAs to generate H2O2, which acts as the coreaction reagent and triggers the ECL signals of CdSe QDs/TiNTs, and thus, the isomers of the nine chiral AAs can be effectively discriminated. In addition, the as-constructed ECL platform can also be used for the sensitive detection of d-AAs in the presence of DAAO with a wide linear range and a low limit of detection. These findings suggest that the CdSe QDs/TiNTs can work as a bifunctional ECL platform (chiral discrimination and chiral sensing), which might be an advanced ECL platform for biomedical applications.
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PubMed
高影响因子
Journal of Energy Chemistry
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2022
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IF 13.599
Shuang Lv,Huifang Liu,Jian Zhang,Qiang Wu,Feng Wang
Photocatalytic hydrogenation of furfural offers an ideal method for selective biomass upgrading into value-added chemicals or fuel additives under mild conditions. However, it is still challenging to control the product selectivity due to side reactions of functional groups and reactive radical intermediates. Herein, photocatalytic transfer hydrogenation of furfural was studied using the TiO 2 -based photocatalysts with alcohols as both the solvent and hydrogen donor. Ultralow loading metal supported on TiO 2 , together with adding a small amount of water in the system, were demonstrated to greatly increase the selectivity of furfuryl alcohol product. Electron paramagnetic resonance (EPR), ultraviolet–visible spectroscopy (UV–Vis) and photoluminescence (PL) measurements gave evidence that ultralow loading Pt or Pd on TiO 2 increase the oxygen vacancy concentration and the photogenerated charge separation efficiency, which accelerates the photocatalytic reduction of furfural. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and mechanistic studies confirmed that photogenerated holes and electrons are active species, with dissociatively adsorbed methanol being directly oxidized by holes, furfural hydrogenated by protons and electrons and H 2 O modifying the intermediate diffusion which contributes to high selectivity of furfuryl alcohol. This work demonstrates a simple approach to design photocatalysts and tune product selectivity in biomass valorization.
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