CHEMOSPHERE
·
2019
·
IF 5.108
Jiajie Xu,Guodong Dai,Biyu Chen,Donglin He,Yue Situ,Hong Huang
An efficient heterogeneous photocatalytic process coupling photocatalysis and Fenton-like process was carried out, where the Fenton-like cycle could be driven by self-produced H 2 O 2 rather than extra H 2 O 2 addition. It was revealed that C 3 N 4 por exhibited good performance at H 2 O 2 production in pure water, which was enhanced up to eight times than bare g-C 3 N 4 . Fenton-like cycle was constructed in Ti 3+ -TiO 2 -C 3 N 4 por as C 3 N 4 por severed as H 2 O 2 donator, while the Ti 3+ -TiO 2 was able to provide photoinduced electrons for the Fenton-like process, resulting in the generation of much more OH radical. In addition, ESR spectra were performed to confirm the promotion of the Fenton-like cycle and much more OH radical was detected in Ti 3+ -TiO 2 -C 3 N 4 por than Ti 3+ -TiO 2 -C 3 N 4 due to the great improvement in H 2 O 2 production of C 3 N 4 por. What’s more, the feasible photocatalytic mechanism of Ti 3+ -TiO 2 -C 3 N 4 por composite was also proposed.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Shaojun Yuan,Chen Chen,Aikifa Raza,Ruixue Song,Tie-Jun Zhang,Simo O. Pehkonen,Bin Liang
Oil-contaminated water caused by either oil spill disasters or industrial disposal has posed a global risk to environmental sustainability and human health. To address the ever-growing need for highly efficient separation of oil/water mixtures, nanostructured TiO 2 /CuO dual coatings were fabricated on the copper mesh by a combination of electrochemical anodization and layer-by-layer self-assembly deposition to render its surface with superhydrophilic, underwater superoleophobic and self-cleaning functionality. Cu(OH) 2 nanoneedle arrays (NNA) were vertically grown from the copper mesh surfaces by electrochemical anodization processes, followed by the deposition of TiO 2 multilayer on the Cu(OH) 2 NNA via layer-by-layer assembly prior to being calcinated to form TiO 2 /CuO dual coatings. The nanostructured TiO 2 /CuO NNA dual-coated copper meshes were demonstrated to exhibit a high separation efficiency (oil residue content less than 20 ppm), excellent water flux (more than 80 kL·h −1 ·m −2 ), and desirable self-cleaning ability under ultraviolet (UV) illumination. The photo-catalytic ability of the deposited TiO 2 layers enabled the facile and rapid removal of the oil contaminants on the mesh surface under UV illumination to recover oil/water separation ability of the as-fabricated mesh for recycle use. With the adherent features of superhydrophilicity, underwater superoleophobicity and self-cleaning ability, the proposed TiO 2 /CuO NNA dual-coated meshes are potentially useful in practical oil/water separation applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhengda Lin,Yijun Liu,Zhongming Zhang,Jie Yao
In this study we used a high-temperature steam-induced hydrolysis method to obtain a fluorinated OH/SiO 2 -TiO 2 /polyethersulfone (PES) composite hollow fiber membrane for CO 2 capture. The purpose of grafting SiO 2 and TiO 2 on the surface of PES by hydrolyzing silicon precursors and titanium precursors at high temperature, is to improve the alkali corrosion resistance and hydrophobicity of the PES membrane. The OH/SiO 2 -TiO 2 /PES composite hollow fiber membranes prepared by the high-temperature steam-induced hydrolysis method and the graft coating method were measured by SEM, EDS , FTIR, WCA, AFM , XRD and XPS in order to characterize the morphology and structure of the prepared membranes. In the CO 2 /CH 4 separation performance test experiment, the OH/SiO 2 -TiO 2 /PES membrane prepared by the high-temperature steam hydrolysis method showed better separation performance than the original PES membrane. The effects of absorbent flow rate, absorbent concentration and feed gas flow rate on CO 2 flux and CO 2 /CH 4 were selectivity investigated. When the flow rate of the absorbent (DEA) reached 16 L/h, the flow rate of the feed gas (CO 2 /CH 4 = 40 : 60) was 30 ml/min, the concentration of the absorbent was 1 mol/L, The CH 4 concentration was 99.88 % and the optimal separation factor was as high as 554.89. In general, the results obtained in this work may provide promising insights into the use of fluorinated OH/SiO 2 -TiO 2 /PES composite membranes for carbon capture and CO 2 /CH 4 separation in GLMC application.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Rongdi Tang,Daoxin Gong,Yaocheng Deng,Sheng Xiong,Jie Deng,Ling Li,Zhanpeng Zhou,Jiangfu Zheng,Long Su,Lihua Yang
In this study, a novel π-π stacked PDI/g-C 3 N 4 /TiO 2 @Ti 3 C 2 photocatalyst with step-scheme (S-scheme) heterojunction was constructed to boost the atrazine (ATZ) photocatalytic degradation by activating peroxymonosulfate (PMS). The π-π interaction in the PDI/g-C 3 N 4 induced the delocalization of the photoelectrons, therefore promoted their migration. Meanwhile, the intimate contact and the staggered band configurations between the PDI/g-C 3 N 4 and TiO 2 @Ti 3 C 2 results in the S-scheme heterojunction thus declined the recombination of photocarriers. The π-π interaction and S-scheme heterojunction synergistically promoted the ATZ removal rate to 75% within one hour and can be well-adapted in a variety of environments. It was found that 1 O 2 domain the photocatalysis, and the H 2 O 2 generated during the reaction may also be helpful for the process. The transformation of ATZ, intermediates, and three pathways during the process were also investigated via LC-MS. Moreover, the total organic carbon analysis shows that the mineralization of ATZ reached 46.08%.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2017
·
IF 4.421
Xiaoyan Hao,Man Li,Li Zhang,Kuokuo Wang,Chunguang Liu
A high efficient photocatalyst (TiO 2 /WO 3 /GO) was developed with tungsten trioxide doping and graphene oxide hybridization. XRD and SEM indicate the formation of crystalline anatase/rutile TiO 2 and hexagonal and cubic WO 3 . UV–vis spectroscopy shows the excellent visible-light-responsive performance. The photocatalyst exhibits excellent photocatalytic performance for bisphenol A degradation under visible light and sunlight irradiations. Transformation by-products were identified and main degradation pathways were proposed. The photocatalytic mechanism is also proposed on the basis of the fact that charge separation is facilitated owing to photo-generated electrons transfer from TiO 2 to WO 3 to GO and photogenerated holes transfer from WO 3 to TiO 2 .
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WATER RESEARCH
·
2022
·
IF 13.4
Cheng Hou,Xinbai Jiang,Dan Chen,Xiaoyu Zhang,Xiaodong Liu,Yang Mu,Jinyou Shen
Due to the pivotal role of Ag-TiO 2 /biofilm/nitrate interface, enhanced visible light-assisted biodegradation of tetracycline (TC) in anoxic system was realized through both batch experiment and long-term operation in this study. The results of the batch experiment elucidated that 50 mg L −1 TC could be completely removed within 10 h in Ag-TiO 2 /biofilm/nitrate system. The continuous flow experiment was operated for 75 d to evaluate the performance and stability of Ag-TiO 2 /biofilm/nitrate system. TC removal efficiency in Ag-TiO 2 /biofilm/nitrate system was as high as 92.4 ± 1.6% at influent TC concentration of 50 mg L −1 TC and hydraulic retention time (HRT) of 10 h, which would be attributed to the promoted separation of photoholes and photoelectrons at the presence of nitrate as electron acceptor. Facilitated electron transfer between semiconductor and biofilm was beneficial for enhancing TC biodegradation, thus lowering toxicity of intermediate products and promoting microbial activity. Moreover, the species related to TC biodegradation ( Rhodopseudomonas, Phreatobacter and Stenotrophomonas ), denitrification ( Thauera ) and electron transfer ( Delftia ) were enriched at Ag-TiO 2 /biofilm/nitrate interface. Besides, a possible mechanism involved in enhanced TC degradation and nitrogen removal at Ag-TiO 2 /biofilm/nitrate interface was proposed. This study provided a novel and promising strategy to enhance recalcitrant TC removal from industrial wastewater.
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高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 21
·6166-6179
·
IF 5.726
Qian Luo,Qi Zhou,Yan Lin,Shaohua Wu,Hongyu Liu,Cheng Du,Yuanyuan Zhong,Chunping Yang
The synthesis of high-performance and recyclable catalysts for oxidative desulfurization (ODS) from fuels has been a significant challenge. In this study, novel catalysts of MoO3–TiO2@MCM-22 with excellent catalytic performance were successfully prepared via a facile impregnation method. The results showed that the optimal catalyst at the Mo–Ti mass ratio of 1 : 4 (MT-1 : 4) exhibited highest catalytic efficiency for the ODS of dibenzothiophene (DBT) with a sulfur conversion of 99.96% within 15 min. Interestingly, the enhanced ODS activity was attributed to the synergistic effect between MoO3 and TiO2, which was achieved by adjusting the concentrations of Lewis and Brønsted acid sites on the surface of MCM-22. The catalyst MT-1 : 4 achieved the highest concentrations of Lewis and Brønsted acid sites and the largest combined index, resulting in the formation of peroxometallate complexes. Moreover, the kinetic studies revealed that the ODS was a pseudo first-order reaction with an apparent activation energy of 48.9 kJ mol−1. There was no significant reduction in the catalytic activity after 8 successive cycles, which manifested the perfect reusability of the catalyst MT-1 : 4 for the ODS system. Furthermore, a plausible ODS mechanism was proposed using the MoO3–TiO2@MCM-22 catalyst. Therefore, the prepared MoO3–TiO2@MCM-22 catalyst exhibited favorable industrial application potential for ODS.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tao Li,Amal Abdelhaleem,Wei Chu,Shengyan Pu,Fei Qi,Jing Zou
The degradation of pyrimethanil (PYR) was investigated through the activation of oxone by the S-TiO 2 (ST) photocatalyst under visible LED irradiation. The catalyst characterization revealed that the sulfur doping mechanism was based on the cation (S 6+ ) substitution of Ti 4+ in TiO 2 lattice. The optimal molar ratio of S/Ti at 0.25 was proven efficient in the PYR degradation. Influences of various reaction parameters including ST loading, oxone dosage, PYR concentration, and initial solution pH were examined. SO 4 •- , • OH, 1 O 2 , O 2 •- , and h + were found to be the reactive species generated in the ST/Oxone/Vis LED process. Different natural water constituents exerted dissimilar effects because of the generation of additional reactive species or their radical scavenging capabilities. Moreover, the reusability test indicates the ST photocatalyst is reusable and stable. A series of degradation intermediates was detected via four major degradation pathways. Overall, the ST/Oxone/Vis LED process was demonstrated to be a promising approach for the removal of organic pollutants.
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COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Liyuan Yu,Dan Yang
Owing to their fast response, high efficiency, and large deformation , dielectric elastomer actuators (DEAs) are promising candidates for application in the fields of artificial muscles, sensors, and soft robots . With the aid of the large actuated strains of natural rubber (NR) at a relatively low driving voltage , titanate oxide (TiO 2 ) nanoparticles (NPs) modified by poly(catechol/polyamine) (PCPA) and deposited by Ag NPs were prepared (labeled as TiO 2 –PCPA–Ag). Due to the synergistic effect of the enhanced interfacial polarization obtained through PCPA modification and Ag NP micro-capacitors, the dielectric constant of the TiO 2 –PCPA–Ag–NR composites increased. In addition, the flexible PCPA endowed the composites with low elastic modulus , resulting in enhanced electromechanical properties . Thus, the NR composites filled with 10 phr TiO 2 –PCPA–Ag NPs exhibited the highest actuated strain of 8.86% at an electric field of 55.94 kV/mm, which is 2.1 times of pure NR (4.30%) at 55 kV/mm. The design of the NR composites proposed in this work via the synergistic effect of an organic layer and metal NPs will play a guiding role in the preparation of novel DEAs, which could meet future requirements for the development of actuators.
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FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Jianan Chen,Jun Zhu,Wentao Xu,Yi Chen,Jicheng Zhou
Highly efficient H 2 and S production from copious waste H 2 S is beneficial from both environmental and energy. Whereas, the highly effective direct decomposition of H 2 S reaction faces a gigantic obstacle, that is, there is the severe thermal equilibrium limitation. Herein, a family of TiO 2 modified Mo x C as novel microwave catalysts have been developed. This work demonstrates that Mo 2 C, Mo 2 C-TiO 2 and MoC@TiO 2 microwave catalysts display excellent catalytic performance to recover both valuable H 2 and elemental S from the direct decomposition of H 2 S under microwave irradiation . The optimal H 2 S conversion of MoC@TiO 2 can be as high as 99.9% (almost complete conversion) at 700 °C, which greatly outpaces the corresponding H 2 S equilibrium conversion under microwave irradiation . This result of the chemical equilibrium limitation being broken shows an interesting phenomenon, namely a significant microwave selective catalytic effect by microwave catalysis in H 2 S decomposition reaction . In addition, the apparent activation energy of the Mo 2 C, Mo 2 C-TiO 2 and MoC@TiO 2 microwave catalysts reduced to 18.2 kJ/mol, 16.8 kJ/mol and 15.6 kJ/mol under microwave irradiation. The work supplies a strategy for highly effective valuable H 2 and S production from H 2 S decomposition reaction , and paves a path to high-value utilization of hazardous waste H 2 S resources with energy-saving heating method.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 6
·4164-4169
·
IF 1.339
Du P. F.,Song L. X.,Xiong J.
Novel TiO2 nanoparticles/nanofibers (NPs/NFs) bilayered nano-composite photoanode film for dye-sensitized solar cells (DSSCs) was fabricated through the combination of spin-coating and electrospinning. The NPs and NFs layers have complementary roles. The underlaid spin-coated
NPs layer provides the photoanode film with higher specific surface area for dye adsorption and improved adhesion to conductive glass substrate. The overlaid electrospun NFs layer endows the photoanode film with better dye-loading and light-harvesting capabilities due to its porous meshwork
structure. And the NFs layer also offers larger pore volume, which can facilitate the electrolyte diffusion and the activity regeneration of dye sensitizers. As a result, the electron transport is accelerated while the charge recombination is suppressed. Ascribing to the synergic effect of
the NPs and NFs layers, the TiO2 NPs/NFs-based DSSCs achieve a conversion efficiency of 4.46%, which is nearly 14% higher than that of the pure TiO2 NPs-based ones.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 9
·8259-8267
·
IF 2.195
Zhou Yi,Zhang Ya,Xiang Ye,Deng Yuehong,Zhao Dawei,Wu Wan,Zhu Jie,Zeng Dandan,Zhao Zheng
Amino acid as a green and non-toxic capping agent was used to regulate TiO 2 crystal face exposure and morphology replaced common inorganic F − ions. In this paper, the hexagonal multi-walled tubular anatase TiO 2 with hierarchical structure exposed to {010} and {101} planes were synthesized by solvothermal method via optimizing the amino acid (glutamine). The microstructure, crystal plane exposure and photocatalytic activity of TiO 2 samples were tested comprehensively, and the formation mechanism of hexagonal multi-walled tubular anatase TiO 2 was proposed. The {010} active plane exposure ratio was 70.76% thanks to the appropriate ratios of glutamine to SO 4 2− and the band gap reduced to 2.95 eV for better visible region absorption. The degradation rate of the material for MO reached 94.6% within 80 min, which was 9.37 times than the sample without capping agent. Both high surface area and the synergy effect between the {010} and {101} facets contribute to the improvement of photocatalytic activity.
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