Electronic Materials Letters
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2022
·Vol. 19
·期 1
·94-107
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IF 3.151
Luo Menghao,Feng Hange,Hu Yuechuan,Chen Keke,Dong Zibo,Xue Shaolin
Abstract Photocatalytic degradation has received considerable emphasis since it shows significant possibilities in environmental pollution. In this work, ternary Z-scheme heterojunction g-C 3 N 4 /TiO 2 /Ti 3 C 2 photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C 3 N 4 and TiO 2 dramatically modify the photocatalytic performances of the compound under illumination. Meanwhile, in this process, multilayer Ti 3 C 2 , as the transport medium of Z-scheme heterojunction, is tightly bonded to TiO 2 generated by hydrothermal oxidation and g-C 3 N 4 with large specific surface area, which effectively facilitates the space charge separation and depresses the charge recombination. When the addition amount of TiO 2 /Ti 3 C 2 is 80 mg and calcined at 450 ℃ for 4 h, g-C 3 N 4 /TiO 2 /Ti 3 C 2 has the greatest photocatalytic performance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C 3 N 4 and 14.55 times that of Ti 3 C 2 , respectively. This work illustrates that g-C 3 N 4 /TiO 2 /Ti 3 C 2 has outstanding potential and offers novel insights for designing and synthesizing new ternary heterojunction materials. Graphical Abstract
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Qi Zhao,Ye Yuan,Luyan Zhang,Liang Qiao,Cheng Ding,Kangshun Wang,Hongpeng Li,Jun Ma,Panpan Wang,Tianming Chen,Feihong Wang
Nonmetal doping is widely used in the modification of titanium dioxides (TiO 2 ) for photocatalytic applications. As a typical two-dimensional layered nanomaterial, the excellent physical and chemical properties of MXene materials have been the focus of current research. In this study, carbon and fluorine co-doped MXene derived TiO 2 nanosheets (labelled as C-F-TiO 2 ) were successfully synthesized and used as catalysts for degrading 2,4,6-trichlorophenol (2,4,6-TCP) under UV light irradiation. The C-F-TiO 2 with ultrathin nanosheet structure enhanced light absorption range and decreased the bandgaps. The degradation efficiency of 2,4,6-TCP by C-F-TiO 2 was over 99 % in 90 min, and the degradation rate was more than twice that of commercial TiO 2 . The degradation rate still remained about 90 % in 90 min after five cycles. The results of quenching experiments and electron spin resonance (ESR) illustrated that more reactive oxygen species (ROS) were generated in the C-F-TiO 2 /UV system, which was 1.5 times that of commercial pure TiO 2 , and • O 2 – was the dominant ROS for 2,4,6-TCP degradation. This study provided insight to utilize physicochemical characteristics of MXene to synthesize non-metal co-doped TiO 2 nanosheet as a catalyst, exhibiting excellent reactivity in the potential application for organic pollutant degradation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhengren Yang,Yuhua Zhen,Yao Feng,Xiaolin Jiang,Zheng Qin,Wenjie Yang,Yuanyue Qie
A systematic study was performed on PM2.5 filtration and photodegradation performance of polyacrylonitrile @TiO 2 / zeolitic imidazolate framework-8（PTZ）hybrid membrane. The hybrid membrane was prepared by electrospinning technique and in situ Metal-organic frameworks (MOFs) synthesis. The optimized membrane maintained a good PM2.5 capture efficiency (greater than 99%) and a pressure drop of 34 Pa. The larger specific surface area and higher pore structure enhance the filter interception effect and electrostatic interaction, which can have high applications for the filtering of PM2.5. In addition, zeolitic imidazolate framework-8 (ZIF-8) is uniformly coated on the surface of polyacrylonitrile @ TiO 2 (PT) nanofiber to form N -Ti-O bonds, thus reducing the reorganization of electron-hole pairs and improving the efficiency of photodegradation. Compared with PT, the hybrid structure formed by PTZ has a higher degradation efficiency for PM2.5 (increased from 66% to 85%). The produced PTZ membrane exhibits a promising future in the collection and green degradation of PM2.5.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Yu Han,Dongting Yue,Miao Kan,Yunwen Wu,Jun Zeng,Zhenfeng Bian,Yixin Zhao,Xufang Qian
Improving the photocatalytic efficiency of commercial TiO 2 has important significance for practical application of TiO 2 based photocatalysts. A novel photocatalyst [Mo 3 S 13 ] 2− /TiO 2 was fabricated by combining [Mo 3 S 13 ] 2− with commercial TiO 2 by an impregnation method. This composite photocatalyst presented a remarkable enhancement on photocatalytic mineralization of acetone in comparison with commercial TiO 2 . The optimum loading amount of [Mo 3 S 13 ] 2− was 1.7wt%, which is more efficient than the Pt/TiO 2 (1.5wt%). Electrochemical impedance spectroscopy (EIS) showed the smooth electron transfer pathway in [Mo 3 S 13 ] 2− /TiO 2 composite, facilitating the photo-charges separation during the photocatalysis process. Reactive oxygen species scavenging test illustrated that superoxide radical ( O 2 − ), hydroxyl radical ( OH) and photo-induced hole (h + ) were all contributing to the acetone degradation. The [Mo 3 S 13 ] 2− /TiO 2 photocatalyst was deposited on non-woven fabrics which showed obvious promotion on the photocatalytic degradation of acetone in comparison with pristine commercial TiO 2 .
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yu-Dong Shan,Song-Hai Wu,Yu-Le Wang,Cong Wang,Shao-Qi Zhi,Yong Liu,Xu Han
Selective oxidation of cyclohexane to cyclohexanol/cyclohexanone (KA–oil) is an important chemical process, which is still constrained by low conversion and selectivity and high energy consumption. In this study, Cu-doped mesoporous TiO2 (Cu-MT) has been successfully synthesized via calcinating MIL-125(Ti) doped with copper acetylacetonate, which shows high reactivity in selective oxidation of cyclohexane to KA–oil by persulfate (PS) with the desirable cyclohexane conversion of 16.8% and a selectivity of 98.0% under mild conditions and the low ratio of PS/cyclohexane of 1:1. A series of characterizations and density functional theory calculations reveal that the doped Cu(I,II) on Cu-MT is the reactive site for non-radical activation of PS with the moderate elongation of the O–O bond in PS, which then abstracts 1H (1H+ + 1e–) from cyclohexane to form Cy• and eventually KA–oil. This study gives new insight on the importance of moderately activated PS in selective oxidation of C–H.
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CELLULOSE
·
2023
·Vol. 30
·期 7
·4713-4733
·
IF 5.7
Chen Maoshuang,Ayaz Pirah,Xiao Yuanxiang,Li Yong,Wang Pei,Huang Wenjia,Zhao Shujun,Fu Feiya,Liu Xiangdong,Xiang Shuangfei
Versatile cotton fabrics can be used in a variety of special environments and offer unparalleled advantages in textile products. In this work, bio-based phytic acid (PA), octadecylamine (ODA) and TiO 2 (NPs) were used as raw materials to prepare multifunctional cotton fabrics with excellent flame retardant (LOI = 48.5%), hydrophobic (WCA = 152°), UV-blocking (UPF = 2000) and antibacterial (BR = 100%) properties through a facile and scalable dip coating and spraying process. Firstly, the phytic acid was grafted onto the surface of cotton fabric by esterification reaction between its phosphoric acid group and the hydroxyl group of cellulose molecules. Then ODA reacted with the residual phosphoric acid group of phytic acid to form an ODA layer, for further immobilizing TiO 2 (NPs) particles on the surface of cotton fabric. The resulting cotton fabric possessed excellent flame resistance (LOI > 36.2%), hydrophobicity (WCA > 138°), UV-blocking (UPF = 2000) and antibacterial abilities (BR > 96.0%) even after 20 washing cycles. Moreover, this modification process did not sacrifice the desired cotton properties, including water vapor permeability, flexibility and tensile strength. This work proposed a simple and scalable pad-dry curing method to construct stable and multifunctional cotton textiles, which have broadened application prospects in many fields. Graphical abstract
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Xuan-He Li,Xiao-Song Li,Xiaobing Zhu,Lan-Bo Di,Ai-Min Zhu
Challenges still remain in catalysts cost, activity and durability for the commercialization of polymer electrolyte membrane (PEM) fuel cells. To preferably alleviate the durability problems with carbon corrosion (but secondarily not to compromise any activities), here we demonstrate composites supported Pt nanoparticles electrocatalysts (Pt/WP x -C 4- x ) for oxygen reduction reaction (ORR). Of interest the composite of warm plasma-synthesized TiO 2 (WP, lab-made) and Vulcan® carbon, was used to support Pt nanoparticles using a simple ethylene glycol reduction method. In terms of physicochemical structures and properties, complimentary characterizations (e.g., SEM, TEM-EDX, XRD , XPS, EPR) and the electrochemical measurements have been conducted. This composite support definitely contributes to the uniform dispersion on surface and the electronic reconfiguration of Pt nanoparticles . Our Pt/WP 1 –C 3 catalyst has an ultrasmall Pt size (ca. 2.15 nm), and surprisingly outperforms commercial Pt/C catalyst. It has achieved 1.24 times electrochemical active surface area (ECSA), 1.85 times mass activity, and 1.5 times specific activity, compared to commercial Pt/C. More importantly, our synthesized catalysts with WP exhibited almost half the activities losses (in ECSA, mass activity, specific activity) after accelerated stress test (AST, a DOE protocol) compared to Pt/C and commercial Pt/C catalysts. Based on the extraordinary achievements on both high activity and enhanced durability, it is attributed to the synergistic effect of WP (of strong metal support interaction, oxygen vacancies , corrosion resistance), and carbon (of high surface area, electrical conductivity).
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Zihuai Xu,Xudong Zheng,Sifan Bao,Tongtong Xu,Biao Ji,Jinfeng Mei,Zhongyu Li
Oil-water separation has given superhydrophilic/underwater superoleophobic (SUS) membrane technology a lot of attention. However, manufacturing multifunctional membranes to meet the complexities of oily wastewater treatment remains a huge challenge. In this work, a multifunctional SUS membrane based on bacterial cellulose (BC) was designed for oil-water separation. ZnCo 2 S 4 (ZCS) was coupled to the surface of TiO 2 nanoparticles to form ZCS-TiO 2 by the simple hydrothermal synthesis method, and then BC nanofibers were mixed with ZCS-TiO 2 to prepare a membrane. Oil/water (o/w) separation is accomplished by the composite membrane at a low drive pressure (0.2–0.3 bar). Its flux is 8232.81 ± 212 L.m −2 h −1 , and the separation efficiency can exceed 99.9%. In addition, the composite membrane also has good photocatalytic performance, the degradation rate of 20-BC/ZCS-TiO 2 for dye within 2 h was 80%. The composite membrane's antibacterial efficacy against gram-positive and gram-negative pathogens was also investigated at the same time, the BC/ZCS-TiO 2 membrane with the lowest content of ZCS-TiO 2 reduced the bacterial viability of Staphylococcus aureus and Escherichia coli by 40.32% and 30.64%, respectively. With the increase of ZCS-TiO 2 content, the bacteriostatic activity also increased; 20-BC/ZCS-TiO 2 completely eradicated both strains (no viable colonies). This work may shed some light on the manufacture of a new generation of multifunctional membranes for wastewater treatment, especially water contaminated with oily wastewater, dyes, and microorganisms.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Junqi Liu,Meng Wang,Saijin Wang,Yanli Zhao,Shi Zhou,Jinlian Li,Dongmei Wu
Oxygenated polycyclic aromatic hydrocarbons (OPAHs) present in the environment can enter the skin through direct contact and long-term exposure can increase the risk of skin inflammation, allergic reactions and skin cancer. In this study, a titanium dioxide-two-dimensional transition metal carbide/multi-walled carbon nanotubes/polydopamine/glassy carbon electrode (TiO 2 -MXene/MWCNTs/PDA/GCE) electrochemical biosensor was prepared to evaluate the cytotoxicity of OPAHs based on the changes in the content of xanthine/guanine (X/G) during cellular metabolism. The TiO 2 -MXene/MWCNTs/PDA/GCE exhibited excellent electrocatalytic activity and sensitivity. The surface morphology, structure and electrochemical properties of TiO 2 -MXene/MWCNTs/PDA composite material were characterized using scanning electron microscopy, X-ray diffraction and cyclic voltammetry. Human skin fibroblast cells (HFF-1) were used as model cells, and the cell viability was evaluated based on the electrochemical signal changes of X/G. When exposed to OPAHs for 30 h, the half-maximal inhibitory concentrations (IC 50 ) of 1,4-benzoquinone (1,4-BQ), 1,2-naphthoquinone (1,2-NQ), and 9,10-phenanthrenequinone (9,10-PQ) on HFF-1 cells were 291.88, 67.72, and 4.44 µmol·L −1 , respectively, which were lower than the IC 50 values of 1075.51, 113.96, and 9.63 µmol·L −1 obtained using the traditional MTT assay, indicating higher sensitivity of the sensor. This study achieved sensitive detection of purines in HFF-1 cells, providing a technical method for evaluating the cytotoxicity of persistent organic pollutants OPAHs in the environment.
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DALTON TRANSACTIONS
·
2023
·
IF 4
Teng Wang,Yifan Qin,Renquan Hu,Zehui Wei,Yong Yang
Reasonable construction of hierarchical electrode materials is verified as a promising way to improve electrochemical performance due to the synergistic effect between unique components and constructions. Hence, a hierarchical nanostructure composed of tungsten oxide nanorods anchored on TiO2 nanowires coupled with carbon layer (TiO2@WOx-C NWs) was synthesized an electrode material by exploiting the self-assembly function of dopamine and carbonization. The inner one-dimensional TiO2 nanowires served as the stable substrate with WOx anchored on the surface of TiO2 NWs and the tightly coupled carbon nanosheets, which can not only facilitate electron transport but also provide more active sites for electrochemical reactions. As a result, benefitting from the synergistic effects between three functional components and the multi-dimensional hierarchical structures, as-prepared TiO2@WOx-C NWs displayed excellent lithium storage performance with a specific capacity of 651.4 mA h g-1 after 500 cycles at 1.0 A g-1, which is superior to most Ti-based structures. Enhanced electrochemical performance is mainly attributed to the synergistic effect of the different dimensional structures, the high capacity of tungsten oxide and the surface coating of the conductive carbon material. This work provides a sample and effective approach to designing functional hierarchical structures for energy storage and conversion.
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Nanomaterials
·
2023
·Vol. 13
·期 22
·2954
·
IF 5.3
Suyi Zhao,Zhenzeng Chong,Xiaogang Zuo,Wenjun Qi
For environmental remediation, it is significant to design membranes with good mechanical properties and excellent photocatalytic activity. In this work, RGO/TiO2membranes with heterogeneous structures and good photocatalytic efficiency were synthesized using the method of electrospinning combined with a thermal treatment process. In the binary nanocomposites, RGO was tightly adhered to TiO2fibers and by simply adjusting the loading of RGO, the strength and modulus of the fibrous membranes were improved. Notably, the RGO-permeated TiO2fibers exhibited 1.41 MPa in tensile strength and 140.02 MPa in Young’s modulus, which were 705% and 343% of the original TiO2fibers, respectively. Benefiting from the enhanced light response and the homogeneous and compact heterogeneous structure, the synthesized RGO/TiO2membranes displayed good antibacterial performance with a photocatalytic inactivation rate of 6 log againstE. coliwithin 60 min. This study offers a highly efficient alternative to inactivateE. colifor the synthesis of TiO2-based membranes.Keywords:RGO/TiO2;nanomembrane;photocatalytic;sterilization
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Liming He,Liming He,Hongda Xu,Xiaolong Wang,Quan Jin
Microwave absorption (MA) has become an important challenge with the development of electronic technology where fine structural design and interface modification of absorbing materials play a crucial role in optimizing their MA performance. In this study, hydrogenated hollow multi-shelled structure (HoMS) TiO 2 (HH-T) was prepared using the sequential template method combined with hydrogenation treatment, followed by the synthesis of HH-T/PPy composite by in-situ polymerization. The HH-T/PPy composite possesses a uniform disordered interface and a uniform 3D conductive network. The HH-T/PPy composite exhibits an improved minimum reflection loss (RL) of −40.2 dB, and an effective absorption bandwidth (RL < -10 dB) of 5.02 GHz with a relatively thin matching thickness of 2.0 mm. The enhanced MA performance is mainly due to the excellent impedance characteristics, interface polarization, and conductive loss. This research offers new insights into the design and analysis of advanced microwave materials with superior performance.
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