ACS ES&T Water
·
2023
·
IF 5.3
Yinshan Xie,Lilantian Cheng,Fei Liu,Jian Li
Advanced nanofiltration (NF) processes have been extensively utilized to handle wastewater generated in the dyeing industry. However, NF membranes inevitably incur fouling issues during their operation procedure. Herein, TiO2 nanoparticles were employed as an additive in the aqueous phase in an interfacial polymerization (IP) process to fabricate the thin-film nanocomposite (TFN) NF membrane. With the introduction of TiO2 nanoparticles, a rougher and more hydrophilic membrane surface was obtained. The optimal TFN membrane with 1.5% TiO2 decoration exhibited a pure water permeability of up to 14.32 L m–2 h–1 bar–1, which was 1.88 times higher than that of the pristine thin-film composite membrane. Moreover, the obtained NF membrane maintained high rejections toward dye molecules (99.7% for Congo red, 99.5% for reactive blue 19, 99.7% for xylene brilliant cyanin G, and 99.1% for methyl blue), considerable salt rejections (44.5% for NaCl, 91.2% for Na2SO4, 54.1% for MgCl2, and 82.8% for MgSO4), and satisfactory stability during the 72 h long-term operation. The exceptional self-cleaning ability of resultant TFN membranes under UV irradiation offered an inspired method for establishing photocatalytic self-cleaning membrane to treat wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Zhaoyang You,Chang Zhuang,Yongjun Sun,Shujuan Zhang,Huaili Zheng
TiO2 nanoparticles (TiO2-NPs) in water were removed by enhanced coagulation with polyaluminum ferric chloride (PAFC) and cationic polyacrylamide (CPAM). The flocculation efficiency by PAFC and PAFC/CPAM for three different initial concentrations (0.2, 2, and 30 mg/L) of TiO2 nanoparticles in pure water and a kaolin suspension system (kaolin concentration: 30 mg/L) were investigated with different coagulant dosages, pH values, precipitation times, and hydraulic conditions. Results showed that the removal rate of TiO2-NPs in the kaolin suspension system was slightly higher than that in a pure water system, and the removal rate of TiO2-NPs obtained by PAFC/CPAM was significantly higher than that by PAFC alone. The removal efficiency of TiO2-NPs increased with increased initial concentration of TiO2-NPs. Under the optimal conditions, the removal rates obtained by PAFC/CPAM for 30 mg/L initial concentration TiO2-NPs in pure water and the kaolin suspension system were 97.98% and 98.62%, respectively. Studies on the fractal dimension of flocs showed that the flocs produced by PAFC/CPAM had a larger fractal dimension than those using PAFC alone. This study demonstrated that turbidity in water helped improve the removal efficiency of TiO2-NPs, and enhanced coagulation can efficiently remove TiO2-NPs from water.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 27
·46446
·
IF 1.901
Yanting Lv,Bo Lu,Si Zhang,Jiayi Li,Guolong Lu,Hang Sun,Song Liang,Zhenning Liu
Polyimine vitrimers are known for their malleability, which endows these materials with properties such as self-healing, recycling, and reshaping. To enhance the mechanical properties of the polyimine vitrimers, composites were fabricated by incorporating amine-functionalized TiO 2 microspheres (amTiO 2 MS) into polyimine matrix. The pure polyimine matrix and polyimine composites hybridized with TiO 2 microspheres (TiO 2 MS) without surface modification were also obtained and examined as the controls in characterization. X-ray powder diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy were employed to demonstrate the presence and distribution of amTiO 2 MS and TiO 2 MS in the polyimine matrices. The investigation of mechanical properties of the amTiO 2 MS enhanced polyimine composites and control samples indicated that incorporation of amTiO 2 MS and TiO 2 MS exhibited different characteristic distribution, which strongly affected the performance of the composites. The optimal filling concentration of amTiO 2 MS was found to be 3%, with which the microspheres were uniformly distributed in the polyimine matrix. The self-healing behavior of the polyimine-amTiO 2 - X was also studied. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46446.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiangyang Ji,Yue Ma,Xiao Sun,Shaojia Song,Kun Yang,Weixin Huang,Chunming Xu,Bohan Feng,Jian Liu,Weiyu Song
Propane direct dehydrogenation (PDH) has received much attention. How to effectively catalyze inert C–H bond activation is of great significance for industrial development. Pt-based catalysts show excellent activity but are limited by their expensive price. Cr-based catalysts are scarcely applied owing to their high toxicity. V-based catalysts are appropriate candidates for their cheap price and low toxicity, but they suffer from high energy consumption. The photothermal synergy effect induced by nonradiative relaxation is expected to make the C–H bond activation and hydrogen coupling process easier compared to bare thermal catalysis. Herein, a set of V/TiO2 nanoscale catalysts were synthesized. The optimized 3 wt % V/TiO2 catalyst (hereafter simplified as 3V) has a particle size of ∼26 nm, achieving a propylene production rate of 342 μmol·g–1·h–1 at 500 °C with UV–vis light radiation, which is 9.2% higher compared with bare thermal conditions. In situ radiation X-ray photoelectron spectroscopy (XPS) shows that photon injection leads to more electron-deficient V atoms (Vδ+, 5 > δ > 3). The strengthened Lewis acidity enhances the C3H8 activation as revealed by kinetic evidence and in situ C3H8-DRIFT measurements. The calculated molecular orbital diagrams show that the V atoms decrease the energy gap between the highest occupied orbital (HOMO) of C3H8 and the lowest unoccupied orbital (LUMO) of the model catalyst. This work describes an efficient photothermal synergy approach, specifically the nonthermal effect for promoting propane dehydrogenation.
研究领域:
化学工程
·
催化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xue Sun,Fang Li,Zhimiao Wang,Hualiang An,Wei Xue,Xinqiang Zhao,Yanji Wang
Well-dispersed AuPd nanoparticles were immobilized on TiO 2 -NC supports derived from NH 2 -MIL-125(Ti) and used as highly active, stable catalysts for hydrogen production from formic acid under mild conditions. The highest total turnover frequency , i.e., 3207 h −1 , for formic acid dehydrogenation was achieved with Au 2 Pd 8 /TiO 2 -NC-800 as the catalyst at 60 °C; this is 1.4 times that achieved with Au 2 Pd 8 /TiO 2 –C-800 under the same conditions. The excellent performance of the Au 2 Pd 8 /TiO 2 -NC-800 catalyst originates from the high anatase TiO 2 content, pyridinic N and oxygen vacancies in the support, the small size and alloying effect of the AuPd nanoparticles, and the metal–support synergistic effect . Doping the support with N improves the catalyst stability because N prevents metal particle aggregation to some extent. These results provide guidelines for the future development and applications of catalysts based on TiO 2 and metal–organic-framework-derived carbon-based materials.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Qiaona Liu,Xin Han,An Qian,Jiayu Qian,Xin Pu,Lei Ye,Jinshan Zhan,Jian Zhang,Qiang Yang,Jichang Liu
Building heterojunctions and exposing more catalytic active sites are effective strategies to enhance the photocatalytic hydrogen evolution activity. Herein, TiO 2 nanosheets are oxidized in situ on Ru-loaded MXene as carriers and subsequently loaded with uniform 2D CdS via hydrothermal method to obtain 2D Ru/Ti 3 C 2 -TiO 2 /CdS composite photocatalysts that integrate heterojunctions and cocatalysts. The formation of heterojunction between CdS and TiO 2 is conducive to promoting the separation and transfer of photogenerated charges, simultaneously, Ru/Ti 3 C 2 with the fully exposed Ru and Ti 3 C 2 can act as effective active sites of photocatalytic hydrogen production reaction. The composite photocatalyst exhibits an improved hydrogen production rate with 5479 µmol g −1 h −1 , which is 5, 3, and four times more than that of pristine CdS, CdS loaded Ti 3 C 2 -TiO 2 and CdS loaded Ru-TiO 2 respectively. The results reveal that the notable enhancement in performance can primarily be ascribed to the introduction of the TiO 2 /CdS heterojunction and the efficient cocatalysts of Ru/Ti 3 C 2 . Moreover, the 2D Ti 3 C 2 with high conductivity as carriers can increase charge transfer, and its 2D structure can serve as a template for growing 2D photocatalysts with higher activity. The interface engineering with multiple interfaces can offer novel insights for the advancement of efficient hydrogen evolution reaction catalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Jianli Wang,Biyang Tuo,Xiulong Shi,Jinwang Tian
A series of BiOCl/TiO 2 /montmorillonite photocatalytic material (BTM) were prepared by sol-gel method combined with calcination process, and were used for the degradation of Congo red. The phase composition, morphology, and optical properties of the as-prepared materials were characterized by XRD, SEM, BET and UV–vis DRS. Compared with BiOCl and TiO 2 , BTM has a better removal effect on Congo red, in which BTM-20 has the highest photocatalytic activity. After 120 min of illumination, the degradation rate of Congo red by BTM-20 reached 94.04 %. The photocatalytic degradation process of Congo red by BTM-20 conformed to the pseudo-first-order kinetic model with a reaction constant of 0.00803 min −1 . The type-Ⅱ heterojunction between BiOCl and TiO 2 promotes the separation of photogenerated electron-hole pairs of BTM-20 and enhances the absorption for visible light. The experiment of the free radical capture indicated that superoxide radical played a leading role in photocatalytic degradation of Congo red, followed by hydroxyl radical. This study provides a new treatment ideas for environmental remediation, and provides an efficient photocatalytic material for the degradation of pollutant.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 12
·125503
·
IF 1.068
Jiaxi Liu,Gang He,Nan Lu,Jiangtao Li
Photo-absorption enhanced black TiO2–SiO2 microspheres were prepared by flame spraying synthesis. The phase composition, microstructure, infrared absorption, and emission property of the synthesized samples were investigated. Compared with the rutile TiO2 raw material, the visible light and near-infrared absorptivity of the flame sprayed TiO2 is significantly enhanced. The addition of SiO2 promotes the rutile-to-anatase phase transformation and appearance of Ti3+ species. The prepared sample with a composition of 40 at.% TiO2–60 at.% SiO2 exhibits the highest absorption of above 95% in 0.79–2.5 µm, and the highest emissivity of above 0.96 in 3–5 µm and 8–14 µm. The black TiO2–SiO2 microspheres with enhanced photo-absorption properties can be used as a promising optical-thermal conversion material.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2013
·
IF 0
Meng Wang,Ming Hao Fang,Chao Tang,Zhao Hui Huang,Yang Ai Liu,Xiao Wen Wu
Er3+ doped ZnO-TiO2 nanofibers with diameter of 100～200 nm were prepared by electrospinning mothed after calcined at high temperature, using polyvinylpyrrolidone(PVP), Zn(NO3)2·6H2O, Er(NO3)3·5H2O, Ti(OC4H9)4 as raw materials. The composite nanofibers were characterized by XRD, SEM, and UV-V respectively. Effects of different calcined temperatures on structure and photocatalytic degradation were investigated. The results indicated that the crystallinity becomes better with the increasing of calcination temperature. The composite nanofibers had the best effects of photocatalytic degradation of methylene blue, when Er3+ doping content was 0.3 wt.% and calcined temperature was 500 °C.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 57
·14202-14208
·
IF 5.236
Yan-Xiang Zhang,Si-Ming Wu,Ge Tian,Xiao-Fang Zhao,Li-Ying Wang,Yi-Xia Yin,Lu Wu,Qian-Ni Li,Yue-Xing Zhang,Jin-Song Wu,Christoph Janiak,Kenneth I. Ozoemena,Menny Shalom,Xiao-Yu Yang
Graphical Erosion of corrosion : TiO 2 nanofibers with rich Ti vacancies have been designed by a facile controllable calcination approach. They exhibit efficient charge transfer and resistance to corrosion by seawater owing to a unidirectional electron trap and superior H + adsorption; which contribute to excellent activity and long-time stability in photodriven seawater splitting. This study could provide a promising strategy for the design of efficient semiconductors in marine applications. Photodriven seawater splitting is considered to be one of the most promising techniques for sustainable hydrogen production. However, the high salinity of seawater would deactivate catalysts and consume the photogenerated carriers. Metal vacancies in metal oxide semiconductors are critical to directed electron transfer and high salinity resistance; they are thus desirable but remain a challenge. We demonstrate a facile controllable calcination approach to synthesize TiO 2 nanofibers with rich Ti vacancies with excellent photo/electro performances and long-time stability in photodriven seawater splitting, including photocatalysis and photo-electrocatalysis. Experimental measurements and theoretical calculations reveal the formation of titanium vacancies, as well as unidirectional electron trap and superior H + adsorption ability for efficient charge transfer and resistance to corrosion by seawater. Therefore, atomic-/nanoscale characteristics and mechanism have been proposed to clarify the generation of titanium vacancies and the corresponding interfacial electron transfer.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Junling Qin,Zhiguang Cao,Hui Li,Zixue Su
TiO 2 nanotubes prepared by anodization of titanium metal substrates are widely used as functional materials in various fields. Small pore size TiO 2 nanotube arrays are demanded because of their excellent performance in applications. However, the minimum pore size of TiO 2 nanotube arrays has been limited to ~15 nm (nm) despite of long time extensive studies. In the present work, we have fabricated TiO 2 nanotube arrays with diameter down to an unprecedented low value of ~6 nm in ammonium fluoride-containing ethylene glycol electrolyte by a simple one-step anodic oxidation method under optimized condition. The influences of concentration of ammonium fluoride, viscosity of solution, amount of adding water and applied voltage on the anodic growth of small pore TiO 2 nanotubes are studied systematically. Pore initiation and widening determined by the competition between chemical dissolution and field driven growth of anodic oxides under relative low formation field strength are investigated, where local concentration of fluoride anions and acidity near pore bottom are believed to play significant roles in the formation of nanoporous or nanotubular TiO 2 with ultra-small pore diameter and cell size. By sealing the reaction cell to prevent the solution from absorbing ambient water, typical TiO 2 nanotube arrays with a pore diameter of ~10.8 nm can grow up to ~1.1 μm in length, i.e. an aspect ratio up to 100, which is remarkable for TiO 2 nanotubes with such small pore size.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Xixia Zhao,Guijuan Wei,Junxue Liu,Zhaojie Wang,Changhua An,Jun Zhang
TiO 2 /TiOF 2 heterostructured nanocomposites has been synthesized through a solvothermal method and characterized by X-ray diffraction, scanning electronic microscopy, transmission electronic microscopy, nitrogen adsorption–desorption isotherms, UV–vis and photo-luminescent spectroscopy. It was found that, compared with single TiOF 2 or TiO 2 , the as-prepared TiO 2 /TiOF 2 nanocomposites exhibited superior photoactivity towards the degradation of organic pollutants, i.e . rhodamine B and solar hydrogen evolution. The results are in accordance with the prohibition of photogenerated electrons and holes recombination in these two samples under light illumination. The photocatalytic activity can be further boosted by introducing Pd nanoparticles onto the surfaces of TiO 2 /TiOF 2 through a simple deposition method without using any stabilizers, which is probably attributed to the enhanced visible-light absorption as well as the facilitated charge-carrier separation after the introduction of Pd nanoparticles. The synergistic effect between TiOF 2 and TiO 2 was discussed and was responsible for the enhancement of their activity in comparison with single counterpart.
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
危险品化学品经营许可证（带存储）