International Journal of Greenhouse Gas Control
·
2016
·
IF 4.064
Yu Zhang,Bo Zhao,Jiazong Jiang,Yuqun Zhuo,Shujuan Wang
The enhancement of absorption of CO 2 by propylene carbonate in the presence of TiO 2 nanoparticles was investigated. The influences of solids loading and particle size of TiO 2 nanoparticles on the absorption rate were studied experimentally. The results show that the gas absorption rate can be enhanced significantly in the presence of TiO 2 nanoparticles. The CO 2 absorption enhancement factor firstly increases and then decreases with the increases of solids loadings, which proves the existence of optimal solids loading. The particle size is also a main factor, which affects CO 2 absorption enhancement factor. As the particle size increases, the optimal solids loading gradually increases. A three-dimensional instantaneous numerous-particle di-mechanism model based on the shuttle mechanism as well as a micro-convection mechanism was developed. The results calculated by the model are close to the experimental results, which showed the model can predict experimental data very well.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Innovative Food Science & Emerging Technologies
·
2015
·
IF 3.273
Zixuan Lian,Yifeng Zhang,Yanyun Zhao
This study investigated the impact of nano-TiO 2 and high hydrostatic pressure (HHP) treatment on microstructure, water vapor and gas barrier, antibacterial and mechanical properties of polyvinyl alcohol (PVA)–chitosan (CHI) biodegradable films and determined the migration behavior of TiO 2 nanoparticles from the films to food simulants. Apart from the effect of filler, TiO 2 nanoparticles also could improve the antibacterial activity of the films and play a role as a plasticizer in the films. HHP treatment promoted the interaction between PVA and chitosan molecules, resulting in the formation of more compacted network structures in PVA–CHI films. The migration of TiO 2 from the films was investigated in food simulants including distilled water, acetic acid, ethanol and olive oil, in which the trace amount of TiO 2 (< 4.20 × 10 − 3 ‰) was only detected in olive oil. HHP treatment at 200–400 MPa significantly reduced migration of TiO 2 nanoparticles from the films. Industrial relevance Results from this study provide a new application direction of high hydrostatic pressure (HHP) in the field of food packaging materials for improving the functionality of materials. Due to the non-thermal characteristic, HHP in combination with nano-TiO 2 not only improved the mechanical and barrier properties of the biodegradable PVA–CHI composite films (polyvinyl alcohol and chitosan based materials), but also enhanced the antibacterial activity of the films. The HHP treated PVA–CHI–TiO 2 films are very stable in food simulants, such as olive oils. Therefore, the utilization of HHP and nano-TiO 2 is promising in the preparation of food packaging materials with desirable functionalities.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yumiao Dong,Qinhui Xie,Shuo Wu,Junbo Li,Lei Sun,Wei Ji
p-Mercaptobenzoic acid (4-MBA) is a typical molecular probe for a surface-enhanced Raman scattering (SERS) study of the enhancement performance of semiconductor nanoparticles. Understanding the molecular adsorption mechanism of 4-MBA on a semiconductor surface is crucial to reveal the enhancement mechanism of semiconductor SERS. Herein, two types of submicrometer-sized TiO2 particles with amorphous (denoted as a-TiO2) and anatase structures (denoted as c-TiO2) were fabricated, and their potential as SERS-active substrates with high electric-field enhancement was explored based on the near-field scattering theory and finite-element method simulation. The electric field-enhanced semiconductor SERS provide a better vision for us to study the adsorption modes of molecules on the TiO2 surface. On this basis, adsorption behaviors of 4-MBA on a-TiO2 and c-TiO2 particles were systematically studied by the semiconductor SERS and density functional theory. The results demonstrated that the adsorption mechanism of 4-MBA with TiO2 surfaces is highly dependent on the exposure of acid sites of TiO2 surfaces. 4-MBA adsorbs preferentially on Brønsted acid sites of a-TiO2 through a carboxyl group, in contrast on Lewis acid sites of c-TiO2 through a sulfhydryl group. Furthermore, 4-MBA molecules may form multilayer adsorption on TiO2 surfaces through the hydrogen bond and/or π–π stacking interaction. Research results not only provide a new insight to re-evaluate the chemical enhancement mechanism for TiO2–4-MBA systems but also provide a theoretical guidance for the modification of TiO2 surface with organic molecules containing carboxyl and sulfhydryl groups.
研究领域:
材料科学
·
表面化学
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 8
·5767-5773
·
IF 1.569
Dou S. Y.,Yan L. T.,Wang H. W.,Liu J. Q.
Nanocrystalline Sb 2 S 3 was synthesized using chemical bath deposition, and TiO 2 –Sb 2 S 3 composite electrodes were fabricated by combining the nanocrystalline Sb 2 S 3 with mesoporous TiO 2 thin films. The composite electrodes were characterized by XRD, SEM, TEM, EDX, and UV–Visible absorption. P3HT and CuSCN were used as hole-transporting materials, and thermally evaporated silver films were used as counter electrodes in the fabricated solar cells. The solar cells with P3HT or CuSCN as hole-transporting material exhibit the highest efficiencies of 0.34 and 0.47 %, respectively.
研究领域:
材料科学
·
纳米技术
·
光伏技术
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Zhenchao Gu,Yu Sun,Li Zhang,Mengyang Lv,Lirong Chen
Carboxylated dyes are regarded as the most effective sensitizers for TiO 2 owing to their propensity to establish more stable ester bonds with the TiO 2 surface. Despite this advantage, the prevailing sensitization protocols lack well-defined guidelines, leading to suboptimal photocatalytic performance. As typical carboxylated dyes, tetracarboxyphenyl porphyrin and tetracarboxyzinc phthalocyanine were synthesized and anchored on TiO 2 under different conditions to investigate the regularities in the sensitization conditions of carboxylated dye-sensitized TiO 2 . Significant differences in the morphology of these catalysts can be observed under different sensitization conditions. Solvents with high dye solubility, low viscosity, and high polarity are deemed more suitable for the dye-sensitized systems. The dye ratio and the duration dictate the amount of anchored dye. Agglomeration of dyes caused by high temperatures or excess dye may seriously damage the performance of the photocatalysts. In summary, among commonly used solvents such as dichloromethane, methanol, ethanol, and DMF, DMF was identified as the optimal solvent for sensitizing TiO 2 with carboxylated dyes. A dye dosage of 1 × 10 -5 mol per gram of TiO 2 was found to be sufficient to achieve uniform surface coverage without causing multilayer adsorption or aggregation. Finally, this study investigated the mechanism of how dye sensitization conditions influence the process, and the principles for selecting sensitization conditions in the future were summarized.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Jie Mao,Xiaoqiang An,Zhenao Gu,Jing Zhou,Huijuan Liu,Jiuhui Qu
Exploring photoactive biotic–abiotic conjugations is of great importance for a variety of applications, but it remains difficult to probe the interfacial transfer of photoinduced charge carriers. In this work, Kelvin probe force microscopy, together with fluorescence imaging technique, were used to visually observe the spatial distribution and interfacial behavior of photocarriers in Microcystis aeruginosa/TiO2 hybrids. Experimental investigations suggested that photosynthetic microalgae cells were prone to trap photoholes from TiO2 photocatalysts. Oxygen vacancy defects in semiconductor exhibited significant impact on the charge migration, as the surface photovoltage of hydrogenated TiO2/microalgae hybrid was much higher than the pristine system. Profiting from the bioenhanced charge separation, biotic–abiotic architecture presented remarkably increased activity for photocatalytic inactivation of microalgae microorganisms. This work not only highlights the visual techniques for understanding the charge transfer around biotic–abiotic interface, but also provides a bioenhanced conjugation for the photocatalytic elimination of microorganisms in water treatment applications.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Hong Peng,Jie Cui,Hongju Zhan,Xu Zhang
Magnetic lanthanum doped TiO 2 (Fe 3 O 4 /SiO 2 /La-TiO 2 , referred to magnetic La-TiO 2 ) and undoped magnetic TiO 2 (Fe 3 O 4 /SiO 2 /TiO 2 , referred to magnetic TiO 2 ) hybrid microspheres with uniform magnetic cores (Fe 3 O 4 /SiO 2 ) were synthesized and characterized in this work. The results indicate that the photoactivity of the magnetic La-TiO 2 is much higher than that of the magnetic TiO 2 for the degradation of 2,4,6-trichlorophenol (10 μM) under UV–visible light irradiation ( λ ⩾ 340 nm). The initial degradation rate ( R 0 , μM/min) for the photodegradation of 2,4,6-trichlorophenol (10 μM) in a 2 g/L magnetic La-TiO 2 dispersion is 0.45 μM/min, which is 1.8 times larger than the value obtained in a 2 g/L magnetic TiO 2 dispersion. The activities of these two catalysts decreased after seven cycles use, probably due to the reduction of surface hydroxyl groups and reaction sites. Carboxylate acids and Cl − were detected as advanced oxidation products. Thus, after 120 min of degradation, the treated 2,4,6-trichlorophenol solution showed no toxicity to HeLa cells. The results clearly demonstrate that the magnetic TiO 2 particularly magnetic La-TiO 2 , would be an effective catalyst for the treatment of solutions polluted with chlorophenols.
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
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Zhuohan Chen,Xiaojing Su,Wenjian Wu,Siting Chen,Xiaofan Zhang,Yunhui Wu,Huali Xie,Kunquan Li
Natural wood, with its unique porous structure, has been widely modified for separating oil-water mixtures. However, the separation efficiency is often unsatisfactory, and little attention is focused on mitigating secondary pollution after its usable lifespan. Here, a superhydrophobic material consisting of delignified wood coated with titanium dioxide (TiO 2 ) and polydimethylsiloxane (PDMS) was prepared. The resulting PDMS@TiO 2 wood possessed outstanding superhydrophobicity, with a water contact angle of 160 o . Owing to its longitudinal channels and excellent water repellency, the wood was successfully used to separate oil-water mixtures, with a high permeation flux of up to 6111 L·m −2 ·h −1 and separation efficiency of up to 93.4%. Importantly, PDMS and other oil pollutants were capable of being largely degraded after use via photocatalysis of the TiO 2 layer, and the degradation reached 8.56 wt% within 30 days. The results from this study provide a method for fabricating functional superhydrophobic wood with photocatalytic degradation ability for efficient oily wastewater treatment.
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
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Yan Zhang,Tianyi Sun,Dashuai Zhang,Zaifeng Shi,Xiaopeng Zhang,Chen Li,Lili Wang,Junjun Song,Qiang Lin
A novel photodegradable Nano-G/TiO 2 /PVC composite film was prepared by codoping nano-graphite (Nano-G) and TiO 2 photocatalyst in Polyvinyl chloride (PVC) plastic. The Characterization tests were performed by using ultraviolet-visible spectroscopy (UV-vis), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), gel permeation chromatography (GPC) and physical and mechanical properties. Compared with TiO 2 /PVC, Nano-G/PVC and PVC film, the Nano-G/TiO 2 /PVC composite film showed higher photodegradability. The weight loss rates of Nano-G/PVC (Nano-G 1 wt%), TiO 2 /PVC (TiO 2 1 wt%) and Nano-G/TiO 2 /PVC (Nano-G 1 wt%, TiO 2 1 wt%) films after the UV irradiation for 30 h were 7.68%, 8.94% and 17.24%, respectively, while that of PVC was only 2.12%. For the Nano-G/TiO 2 /PVC composite film, the optimal doping amount of nano-graphite is 1 wt%. The decline rates of Mw and Mn of Nano-G/TiO 2 /PVC (Nano-G 1 wt%, TiO 2 1 wt%) composite film were 12.93% and 61.97%, respectively, which were much higher than that of PVC. Nano-graphite can effectively improve the migration and separation of TiO 2 photogenerated electrons, improving the photodegradation rate of PVC. The mechanism of the Nano-G/TiO 2 /PVC composite film photocatalytic degradation was proposed. The photocatalytic technology is a feasible and effective way to solve "white pollution".
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
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 15
·7278-7287
·
IF 3.3
Jie Zhang,Xuemeng Tian,Chaochao Dong,Ruixia Gao,Yuan Hu
There is a growing awareness of practices focused on the in-depth treatment and decontamination processes of firefighters’ personal protective equipment to decrease health risks. Hence, TiO2-nanoparticle-modified Cu-doped BiOBr microflowers (BiOBr–Cu2+/TiO2) have been devised and used as effective constituents to construct a type of decontamination agent that can efficiently and deeply eliminate hazardous chemicals. The 3D microflowers can be admirable carriers for the prevention of aggregation and outstanding adsorption, and the construction of a heterojunction based on the copper-doping strategy and sequential harvesting of light strategy provides enhanced light absorbance and efficient charge separation. The proposed materials have a nanoparticle-interspersed microflower morphology, enhanced light-harvesting ability, and excellent transfer of photogenerated carriers, leading to more effective adsorption and solar-light-driven photocatalytic activity than other catalysts. Moreover, the BiOBr–Cu2+/TiO2 composites mixed with different solvents can be used as decontamination agents for the in-depth treatment of hazardous chemicals under different situations. It is believed that employing heterojunctions as the constituents of decontamination agents has promise to become an effective and feasible method for deep decontamination processes in firefighting work.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1048
·
IF 3.9
Wanli Liu,Jinfeng Liu,Xiaoqian Wang,Jiazhen He,Yuqing Li,Yong Liu
Practical applications of CsPbX3nanocrystals (NCs) are limited by their poor stability. The formation of a heterojunction between CsPbX3NCs and oxides is an effective means to protect perovskite from polar solvents and other external factors. Significantly improving the stability and photocatalytic properties of the core/shell perovskite is very important for its application in photoelectric and photocatalytic technology. Here, we report the synthesis of asymmetrical CsPbBr3/TiO2core–shell heterostructure NCs at the single-particle level by hot-injection liquid-phase synthesis and sol–gel method, where each CsPbBr3NCs is partially covered by titanium dioxide. We tested not only the optical properties of the material but also the electrochemical impedance and photocurrent density of the material in sodium sulfate solution. It is shown that the type II arrangement is generated at the heterogeneous interface, which greatly facilitates the separation of electron–hole pairs and increases the carrier transport efficiency. Compared with CsPbBr3NCs, CsPbBr3/TiO2has higher photocatalytic efficiency. More crucially, due to the protection of the titanium dioxide shell, the product has higher long-term stability in humid air compared with bare CsPbBr3NCs. The asymmetrical core–shell heterostructure prepared in this study not only improves the stability of CsPbX3NCs but also provides some ideas for optoelectronic device applications and TiO2-based photocatalysts.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 10
·3067-3078
·
IF 3.186
Zhu Ying,Yang Jiandong,Bian Chang,Yang Wenshu,Meng Xianwei,Liu Zhiyan,Li Ying,Zhao Yingying,Fu Wuyou,Yang Haibin
Abstract A new strategy to enhance the photocatalytic properties of graphitic carbon nitride is reported via constructing an effective NiO decorated Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 S-scheme heterostructure photocatalyst thin film (Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 /NiO). This thin film photocatalyst can separate hydrogen gas and oxygen gas into different sides of the Ti substrate. Owing to the synergistic effect of the NiO as co-catalyst and the formation of Step-scheme (S-scheme) heterojunction between g-C 3 N 4 and TiO 2 , the electrons and holes were successfully separated to their opposing active centers, which is beneficial to inhibiting the recombination of the charge carriers. The gas evolution rate of Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 /NiO is 7.97 μmol h −1 cm −2 under the irradiation of high-pressure mercury lamp, which was 3 and 1.3 times as high as that of the Ti/TiO 2 NT/g-C 3 N 4 and Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 , respectively. Firstly, benefiting from the well-matched band structure, a direct S-scheme Ti/TiO 2 NT/g-C 3 N 4 heterojunction thin film is constructed easily driven by the built-in electric field across the Ti/TiO 2 NT/g-C 3 N 4 interface. Furthermore, the introduction of the TiO 2 layer on the TiO 2 NT will broaden light absorption range and increase the heterojunction area, which in turn conduces to effective charge separation. In addition, NiO as a co-catalyst cannot only accelerate the charge separation but also provide plentiful catalytic sites and decompose H 2 O 2 produced by g-C 3 N 4 . The thin film photocatalysts can be recycled again, which is different from traditional powdered photocatalysts. This work constructs a NiO decorated Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 S-scheme heterostructure photocatalyst thin film, and provides a new insight to promote photocatalytic activity of g-C 3 N 4 under the synergetic impact of S-scheme heterostructure and NiO co-catalyst. Graphic Abstract
A novel NiO decorated Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 S-scheme heterostructure photocatalyst thin film was fabricated to enhance photocatalytic activity for water splitting.
研究领域:
材料科学
·
光催化
✓ 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）