JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 34
·e52603
·
IF 3.057
Kun Chai,Zesheng Xu,Dong Chen,Yingtao Liu,Yiqun Fang,Yongming Song
Microcellular foamed wood-plastic composites (WPCs) have shown good development prospects in environmentally-friendly composites. Herein, the foamed wood flour (WF)/polypropylene (PP) composites were fabricated by mold-opening injection molding using supercritical N 2 as a physical foaming agent. The effects of nano TiO 2 on the microcellular structure and mechanical properties of WF/PP composites were investigated, and the results show that nano TiO 2 accelerates the crystallization rate and reduces the crystallinity of PP, which is beneficial to the formation of foamed homogeneous systems and cell growth in the WF/PP composites. This is mainly due to heteronucleation effect of nano TiO 2 , resulting in the refinement of crystal. Molecular chain movement of PP is limited with the introduction of nano TiO 2 , resulting in increased the melt elasticity of WF/PP composites, thereby reducing cell coalescence and collapse. With the addition of 5 wt% nano TiO 2 , the cell density was increased by 393.8%, the cell size was reduced by 54.4%, and the cell size homogeneity was clearly improved. In addition, impact strength increased by 33.3%. The improved foamability of WF/PP composites using nano TiO 2 shows a great promise for the production and application of WPC foams, especially in automotive, packaging and building areas.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 15
·7195-7201
·
IF 3.925
Huan Liu,Jingzhe Li,Yue Chen,Xuting Sun,Xun Xu,Lingfang Qiu,Shuwang Duo,Ping Li
One of the feasible strategies to enhance the photocatalytic properties of TiO2 is to broaden the visible light response range and accelerate the separation rate of photo-induced electron–hole (e−–h+) pairs by designing and synthesizing heterostructures using narrow-band-gap semiconductors. In this study, a ternary heterostructure based on MOF-derived TiO2 was first fabricated via the self-sacrificing template method followed by a two-step chemical bath process. The as-obtained CdS/ZnIn2S4/TiO2 ternary heterostructures exhibited better visible-light photocatalytic properties for the degradation of Rhodamine B (RhB) and tetracycline (TC) than single-component and dual-component systems. Among the ternary heterostructures, it was found that the CdS/ZnIn2S4/TiO2-II showed the highest photoreactivity of 95.3% for RhB removal and 91.8% for TC removal within 40 min. In addition, CdS/ZnIn2S4/TiO2-II could maintain its photocatalytic properties during the stability test. The improvement in photocatalytic properties is attributed to the reasonable construction of a ternary heterostructure, which significantly accelerates the separation and transport of photogenerated e−–h+ pairs, improves the specific surface area, and broadens the visible light response range. This study demonstrates a promising strategy for developing ternary heterostructures as effective photocatalysts for the degradation of organic pollutants.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qun Ma,Zhigui Zhang,Pengzu Kou,Dan Wang,Zhiyuan Wang,Hongyu Sun,Runguo Zheng,Yanguo Liu
Two-dimensional layered MXene material with high conductivity and good mechanical flexibility has gained wide attention in the field of energy storage. However, the practical application of MXene was hampered by its limited specific capacity and the unstable structure. Herein, a composite of in-situ grown niobium-doped TiO 2 nanosheet arrays on a double transition metal MXene TiNbCT x (TiNbC@NTO) was successfully obtained via a hydrothermal pretreatment followed by in-situ partial oxidation strategy. The prepared TiNbC@NTO combines multiple advantages of both MXene and oxide, including high conductivity derived from the unoxidized MXene TiNbCT x , superior structure stability from the in-situ produced oxide between the MXene layers, which prevents structural collapse and restacking during charging and discharging, and the large layer space which promotes lithium-ion transport. The degree of oxidation of MXene can be adjusted by controlling the reaction temperature, and the oxide nonosheet turn dense with the increase of the temperature. All the oxidized MXenes show improved electrochemical performance compared with the pure TiNbCT x , and the TiNbC@NTO-500 with the appropriate degree of oxidation exhibits the highest reversible capacity, best cycling stability of 261 mAh g −1 after 500 cycles at 1.0 A g −1 among all the as-prepared composites. Furthermore, an extraordinary rate performance (148.5 mAh g −1 at 2 A g −1 ) was obtained based on the pseudocapacitance dominated mechanism. This work provides a new insight into improving the performance of MXene-based anode material for lithium-ion batteries.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jie Yang,Jia Li,Xiaohui Yan,Yangsai Lyu,Ningning Xing,Ping Yang,Peng Song,Min Zuo
A novel multifunctional Janus magnetic micromotor was designed and constructed by using MIL-100(Fe)@TiO2@Fe3O4 multicore–shells modified with horseradish peroxidase (HRP) as a smart active platform to realize detection and degradation of hydroquinone (HQ). The obtained micromotor showed a unique three-dimensional (3D) hierarchical architecture with highly exposed active sites and could autonomously move at a speed of 140 ± 7.0 μm·s–1 by O2 bubbles generated from the catalytic decomposition of H2O2 fuel. Benefiting from the combination of active self-propulsive motion, high peroxidase-like activity, tuned heterojunctions with matching band structures, and a 3D hierarchical structure, an effective platform involving dynamically sensitive detection and quick removal of HQ from water was established by using the multifunctional HRP-integrated MIL-100(Fe)@TiO2@Fe3O4 Janus micromotor. The proposed multifunctional Janus magnetic micromotor had advantages of simple and feasible fabrication, sensitive detection and effective photo-Fenton degradation of HQ in a wide pH range of 4–7, and magnetic recycling, revealing potential for environmental remediation applications.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qian Li,Jiahui Zhang,Jiayu Zhou,Wang Xu,Zhuowei Cheng,Piet N.L. Lens,Jianmeng Chen,Dongzhi Chen
The effective and economic treatment of chlorobenzenes has become one of the most intractable issues in the field of air pollution control. Herein, a visible-light photocatalysis coupled with biodegradation (VPCB) system was developed by integrating an innovative visible-light responsive TiO 2 /oxygenous groups decorated g-C 3 N 4 (TiO 2 /OCN) with polyurethane carriers immobilized with Ralstonia sp. XZW-1 for chlorobenzene removal. Performance tests showed that light intensity, preparation of the MICs, catalyst dosage and composition of the TiO 2 /OCN cast significant influence on chlorobenzene removal efficiency, with the degradation efficiency, mineralization and dechlorination ratios of VPCB achieving 100%, 35.5%, and 99.4% under the optimal conditions, respectively, outcompeting the sum of visible-light photocatalytic system and biodegradation protocols. Cycling tests further demonstrated the excellent stability of VPCB. Mechanism analysis found that increased reactive sites, improved visible-light harvesting, accelerated charge transfer and separation, and the resulting abundant active species jointly contributed to the enhanced photocatalytic activity of TiO 2 /OCN. Photogenerated holes were most significant active species for chlorobenzene removal, followed by OH and O 2 − radicals. The carriers could effectively protect microorganisms from light illumination and strong oxidizing species, allowing the further microbial metabolism of chlorobenzene photocatalytic oxidation intermediates with good biodegradability, not only greatly promoting the microbial growth and activity, but further enhancing chlorobenzene photocatalytic degradation. Plausible synergistic mechanism for chlorobenzene degradation between photocatalysis and biodegradation was also revealed. Furthermore, the VPCB system constructed presented wide applicability towards various pollutants, and its performance was found closely related with the hydrophobicity of pollutants. This work provided insight into the design and application of the VPCB system for the efficient and economic treatment of refractory pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Caixia Chen,Shumei Wang,Fang Han,Xiaoying Zhou,Benxia Li
The reasonable construction of composite membranes with dual functions of rapid adsorption and photo-Fenton-like oxidation degradation holds great significance in the field of wastewater purification. Herein, a poly(vinylidene fluoride)-based composite membrane (denoted as CFT/PVDF) was meticulously prepared through a nonsolvent induced phase separation (NIPS) process with the introduction of cobalt-iron metal–organic framework (CoFe-MOF) and TiO 2 (Degussa P25). The composite membrane exhibited an excellent adsorption ability for removing a variety of organic pollutants from water. With the integration of adsorptive filtration and in situ photo-Fenton-like degradation, the removal efficiency of tetracycline hydrochloride reached up to 92.9% through the CFT/PVDF membrane in one filtration process, and the remarkable performance could be maintained after ten consecutive cycles. Moreover, a group of CFT/PVDF membranes was connected in series to realize the fast and continuous wastewater treatment. The photo-Fenton-like oxidation mechanism and possible degradation pathways were proposed on the basis of active-species detections and degradation intermediates analysis. The toxicological analysis indicated that tetracycline was in situ degraded into less toxic intermediates and even nontoxic substances by the CFT/PVDF composite membrane. This work provides some valuable guidance on the construction of self-cleaning membranes for sustainable wastewater remediation and potential applications.
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Journal of Water Process Engineering
·
2023
·
IF 7
Feng Li,Zhen Wu,Xiaolong Tang,Xiangwei Li,Xingqiang Liu,Shuyuan Yu,Longfu Wei,Changlin Yu
Ti-based semiconductors the eco-friendly materials. Here, using n-tetrabutyl titanate and calcium acetate as raw materials, a dual- Z -scheme TiO 2 /CaTi 4 O 9 /CaTiO 3 heterojunction was facilely constructed via the solvothermal combination with calcination route. The obtained samples were intensively characterized by some physicochemical methods such as TG, XRD, FT-IR, SEM , TEM, XPS, UV–Vis DRS, PL , N 2 physisorption-desorption, and electrochemical tests. The optimum TiO 2 /CaTi 4 O 9 /CaTiO 3 photocatalyst fabricated at a solvothermal temperature of 160 °C and calcination temperature of 700 °C shows high efficiency for H 2 production, which was 11, 5, and 1.6 times higher than that of rutile-phase TiO 2 , CaTiO 3 and commercial P25(TiO 2 ), respectively. The Cr(VI) reduction rate over TiO 2 /CaTi 4 O 9 /CaTiO 3 was 3.3, 5.2, and 3.1 times higher than those of rutile-phase TiO 2 , CaTiO 3, and commercial P25, respectively. The superior photocatalytic performance is attributed to the strong redox ability of carriers excited by wide band gap semiconductors and the unique dual- Z -scheme which largely promotes carrier separation.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Cong Liu,Yanhui Li,Xu Cui,Chen Liang,Gaojun Xing,Qian Duan
This study synthesized a recyclable dual-responsive core–shell photocatalyst Fe 3 O 4 @SiO 2 @TiO 2 @ZnIn 2 S 4 /ZnPc (FSTZP) used for hexavalent chromium (Cr (VI)) reduction. Core-shell Fe 3 O 4 @SiO 2 @TiO 2 (FST) was prepared and modified with ZnIn 2 S 4 and zinc-tetra ( N -carbonylacrylic) aminephthalocyanine (ZnPc) to obtain FSTZP and characterized by XRD, XPS, SEM, HRTEM and UV–vis DRS. In FSTZP, ZnIn 2 S 4 could provide more adsorption active sites and promote charge-carrier separation; ZnPc would efficiently use visible light to transfer energy. Both of ZnIn 2 S 4 and ZnPc in FSTZP could improve the light-harvesting resulting in excellent photocatalytic performance of FSTZP towards Cr (VI) reduction and pollutant degradation. The highest reduction efficiency of Cr (VI) by FSTZP (0.3 g/L) was up to 96.4% in 60 min at pH = 6. The removal efficiencies of Rhodamine B (RhB), Methylene blue (MB), Methyl Orange (MO) and Tetracycline hydrochloride (TC•HCl) by FSTZP (0.3 g/L) under visible light were 99%, 99%, 95% and 86% in 40 min at pH = 6. Meanwhile, almost all of Cr (VI) and organic molecules in the coexistence system could be removed by FSTZP under visible light. FSTZP also presented the adsorption property and the mechanism of dual-responsive FSTZP for Cr (VI) reduction and organic pollutants removal was explored. Moreover, as an efficient photocatalyst, FSTZP still maintained stability after reused for fourth photocatalytic cycle by magnetic recovery. This study was devoted to develop an efficient photocatalyst suitable for removing Cr (VI) and organic pollutants.
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Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-14
·
IF 16.419
Su Die,Pei Yi,Liu Li,Liu Zhixiao,Liu Junfang,Yang Min,Wen Jiaxing,Dai Jing,Deng Huiqiu,Cao Guozhong
The unique wire-in-wire structure endows TiO 2 /C nanofibers film with superior mechanical flexibility.
The wire-in-wire TiO 2 /C nanofibers (TiO 2 ww/CN) film shows outstanding electrochemical performances as free-standing anodes for Li/K-ion batteries and full cells.
The TiO 2 ww/CN film shows an extremely high pseudocapacitance contribution ratio in K-ion batteries.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 8
·12188-12197
·
IF 4.223
Jiang Chengyu,Chen Qingjin
Nanoparticles can undergo aging phenomena in sewage treatment systems, which alter their physical and chemical properties. However, the effect of aged nanoparticles on the dewatering performance of activated sludge under long-term low concentrations is yet to be reported in sewage treatment systems. Here, we compared the chronic effects of pristine and aged TiO 2 nanoparticles on the sludge dewatering index, which includes specific resistance to filtration (SRF) and bound water (BW) in a sequencing batch reactor (SBR) at μg/L concentration levels, and analyzed the relevant mechanisms. The results indicated that aging in the sludge supernatant altered the photosensitivity and water stability of nanoparticles, which was mainly due to the changes in the zeta potential and energy band of the particle and was ultimately attributed to the combined effect of particle surface inclusions such as organic matter and inorganic salt. At 10 μg/L, nanoparticles reduced the sludge dewaterability, which observed an improvement at 100 μg/L. This is because 10 μg/L promoted the secretion of extracellular polymeric substances (EPS), which regulated the structure of sludge flora and increased the abundance of secreted quorum sensing-acyl-homoserine lactones (QS-AHL) and EPS genera, while the corresponding exposure results for 100 μg/L were the opposite, owing to the damage and necrosis effects caused by exposure under long-term light, which reduced EPS production and increased sludge density. Interestingly, aging could alleviate the effects of two exposure concentrations on sludge dewatering, mainly because of the decrease in the photoactivity of the nanoparticles. The results of this study show that environmental aging could delay, but not reverse the results of exposure to specific concentrations of nanoparticles. However, the significantly different ecological effects of photosensitive nanoparticles with two environmentally relevant concentration should be refined and confirmed again in freshwater environments to provide a basis for subsequent scientific management and control of photosensitive nanoparticles.
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PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2020
·Vol. 97
·期 2
·398-407
·
IF 2.721
Zhang Huilan,Wang Juan,Zhang Wen,Han Dong,Zhang Aiping
In the paper, a composite TiO 2 /SiO 2 -NHOC-FA was prepared using the coupling method which is a folic acid-targeted silica-coated titanium dioxide. Their structures were characterized by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), X-ray diffraction (XRD), transmission electron microscope (TEM) and zeta potential method. The results showed that the average diameter of the prepared TiO 2 /SiO 2 -NHOC-FA composite is 18 nm, which is spherical. Compared with unmodified TiO 2 , TiO 2 /SiO 2 -NHOC-FA composite had superior water solubility and dispersion, and enhanced its photokilling activity by folic acid-targeted to FR (+) cells. In addition, photocatalytic TiO 2 /SiO 2 -NHOC-FA arrested cell cycle in G2/M phase of MCF-7 cells, resulting in a significant reduction of mitochondrial membrane potential (MMP), and also made the apoptosis rate, ROS components and intracellular calcium concentration increased. It killed the MCF-7 cells through apoptosis pathway. These results for the TiO 2 /SiO 2 -NHOC-FA composite can provide a theoretical basis for the photodynamic development of TiO 2 .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Mengnan Qu,Qian Liu,Songbai Yuan,Xin Yang,Chen Yang,Jiehui Li,Lulu Liu,Lei Peng,Jinmei He
The sustainable development of modern industry and the frequent emergence of marine oil spills have caused a significant and far-reaching impact on water resources, prompting individuals to develop an advanced technology or material for the solution of oily wastewater. Therefore, a functionalized material herein has been successfully fabricated by decorating cotton surface with photocatalytic titanium dioxide (TiO 2 ) nanoparticles and chemical components containing pH-sensitive carboxyl groups through a simple, green and cost-effective approach. By combining the nano-roughness structure of the surface with the suitable surface components, endowing the as-obtained cotton with the splendid properties of adjustable surface wettability, photocatalytic degradation and durability. Based on the tunable wettability of the resulted cotton, it can intelligently separate two forms of oil/water mixtures involving stratified oil-water mixtures and surfactant-stabilized emulsions with prominent separation efficiency. Simultaneously, by virtue of the resultant superwettable cotton, the high-speed and high-efficiency in-situ purification of oily wastewater driven by negative pressure is successfully realized. More interestingly, benefitting from the photocatalytic property of TiO 2 , this resulting cotton can be also exploited for degrading water-soluble dyes to achieve water purification. In light of the unique predominance of the above-mentioned modified cotton, this newly developed economical strategy can promote the extensive development of multipurpose superwetting materials, providing tempting potential for the treatment of intricate oily wastewater.
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