JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 7
·4564-4574
·
IF 2.1
Lu Jingmin,Qian Haoran,Ge Lei,Zhang Zhongcheng,Hao Hequn,Xu Zezhong,Yu Tingting,Li Minghua,Tian Changan,Xie Jinsong
In this paper, Ag/TiO 2 composites with different Ag doping ratios (0.5%, 1%, 2% and 3%) were prepared by a one-pot solvothermal method without post calcination. Glycine promoted the formation of rod-like TiO 2 growing along the (101) plane and introduced Ag nanoparticles (NPS) onto the surface of TiO 2 . A series of characterization tests, including x-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), x-ray photoelectron spectroscopy (XPS), UV–Vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy, nitrogen adsorption and desorption measurement, and electrochemical measurements were employed. The measurements confirmed that the formed Ag/TiO 2 nanorod composite with 1% Ag loading ratio (Ag/TiO 2 -1), consisting of length up to 22 nm and Ag nanoparticles (NPS) with a diameter of about 5.5 nm, had an appropriate energy band gap of 2.95 eV and a large specific surface area of 158.3 m 2 /g, which shows that the Ag/TiO 2 -1 has abundant photocatalytic active sites to increase its visible-light absorption ability. The Ag/TiO 2 -1 sample has the highest photocatalytic efficiency, with up to 95% and 98% degradation for tetracycline (TC) and Rhodamine B (RhB), respectively, in 25 min under simulated solar light. After the sixth cycle experiment, Ag/TiO 2 -1 still maintained 94% and 95% degradation of TC and RhB, respectively. The trapping active species experiment confirmed that the hole (h + ) and superoxide radical \(\left( { \cdot {\text{O}}_{2}^{ - } } \right)\) are the main active species. This work has practical significance for the simultaneous study of the photocatalysis of Ag/TiO 2 composites for dyes (RhB) and antibiotics (TC).
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zhiwei Zhou,Jiakang Yan,Xing Li,Jiawei Ren,Heng Liang,Yongwang Liu
Algal intracellular organic matter (IOM), released during algae's normal growth phase and water treatment processes, has long been a source of significant membrane fouling , considerably limiting the effective use of ultrafiltration(UF) technology. In this study, a Bi-doped TiO 2 composite with powdered activated carbon (Bi 2 O 3 –TiO 2 /PAC) was loaded on ceramic UF membranes by vacuum filtration, and the prepared photocatalytic modified ceramic membranes (MCMs) were investigated for the removal of IOM and the mitigation of membrane fouling at different loading levels and under three operating conditions: Dark, Dark-UV, and UV. The results showed that the photocatalytic MCMs were able to remove the protein and humic acid fluorescent components of IOM and decompose or mineralize organic matter with molecular weights of 10–50 kDa. Under the Dark, Dark-UV, and UV conditions, the final normalized flux of MCM-2.88 was significantly increased by 22.6 %, 82.1 %, and 108.0 %, respectively. The hydrophilicity of MCMs not only transformed the interactions between IOM and the membrane into repulsive forces, but also the composite material on the membrane surface transforms the membrane fouling mechanism from intermediate blocking model to cake layer formation. Furthermore, the application of photocatalytic oxidation under the Dark-UV and UV conditions yielded a reduction in both reversible and irreversible fouling. This action led to an increased hydrophilicity and elevated free energy of adhesion with IOM during the filtration process. Moreover, the main fouling mechanism changed into complete or intermediate blocking. These outcomes collectively underscore the capability of MCMs to alleviate membrane fouling induced by IOM. This advancement holds substantial promise for the advancement and widespread implementation of photocatalytic ceramic membrane filtration techniques.
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Nano Research
·
2016
·Vol. 9
·期 6
·1763-1774
·
IF 8.893
Shoaib Anwer,Ji Muwei,Qian Hongmei,Liu Jiajia,Xu Meng,Zhang Jiatao
In this work, we present a new versatile strategy to prepare noble metal (Au, Ag and Cu) nanoclusters on TiO 2 nanosheets in large scales with exposed (001) facets with controlled size, crystalline interface, and loading amount. By precise in situ calcination, the metal (M = Au, Ag, and Cu) nanocrystals with controllable size and better crystalline interface with the TiO 2 support have been prepared. The potential application of the as-prepared Au, Ag, and Cu nanoclusters on TiO 2 nanosheets as potential heterogeneous catalysts for organic synthesis, such as catalytic reduction of 4-nitrophenol to 4-aminophenol, has been demonstrated. After calcination, Au, Ag, and Cu nanocrystals were found to be proficient cocatalysts for photocatalytic H 2 evolution, particularly the Au cocatalyst. Based on precise high-resolution transmission electron microscopy (HRTEM) and inductively coupled plasma optical emission spectrometry (ICP-OES) analyses, the flexible control of their size and loading amount as well as their intimate contact with the TiO 2 nanosheet enhanced the photocatalytic H 2 evolution activity and the sensitivity of the photocurrent response of the film. Furthermore, this aqueous-directed synthesis of metal nanoclusters on a support will generate further interest in the field of nanocatalysis.
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Materials Express
·
2023
·Vol. 13
·期 11
·1922-1928
·
IF 0.7
Yang Jing,Deng Qiuhui,Luo Chunhua,Yang Aofeng,Luo Xiaohu,Guo Meng,Fu Lichun,Zhen Deshuai,Zhou Huang
Holmium (Ho) modified TiO2 (Ho–TiO2) nanocomposites have been prepared by a sol–gel process, and were used as an effective adsorbent and matrix for the enrichment and analysis of bisphenol S and Indigo by matrix-assisted laser desorption/ionization
time-of-flight mass spectrometry (MALDI-TOF MS). The low detection limits of bisphenol S (BPS) and Indigo (ID) are 0.1 pg·mL−1 and 5 pg·mL−1, respectively. Extremely BPS detection could be achieved in tea samples with good recovery (81.5–93.0%).
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LANGMUIR
·
2023
·
IF 3.9
Wenjing Zhu,Zhinan Xia,Bingfeng Shi,Changli Lü
A series of 2D M(Cu, Zn, Co, and Mn)-TCPP MOFs/TiO2 binary nanocomposites (TCPP = tetrakis(4-carboxyphenyl)porphyrin) were constructed by solvothermal in situ loading of flaky TiO2 on the surface of 2D metal–organic frameworks (MOFs). The influence of different coordination metals on the catalytic activity was studied, and it was found that the 2D Cu-TCPP MOFs/TiO2 nanocomposite exhibited the best photo-Fenton performance. The superior property can be attributed to the high absorption coefficient and ultrathin two-dimensional structure of the 2D Cu-TCPP MOFs nanosheets. Meanwhile, the 2D Cu-TCPP MOFs/TiO2 II heterostructure can effectively promote the separation and transfer of photoformed carriers. Moreover, under visible irradiation, the optimized 2D Cu-TCPP MOFs/TiO2 composite can convert 99.9% of Cr(VI) to Cr(III) within 60 min with methanol as the hole scavenger at pH 3.14. Also, the photocatalytic performance of 2D Cu-TCPP MOFs/TiO2 was maintained after five reaction cycles. Furthermore, the proposed visible-light-driven photocatalysis mechanism of the 2D Cu-MOFs/TiO2 composite was reasonably derived according to experimental results. This study demonstrates the potential of building efficient TiO2-based visible light photocatalysts with 2D metal-porphyrin MOFs.
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ENERGY
·
2021
·
IF 7.147
Liangdong Hu,Longlong Ma,Guangzhi Hu,Wenjie Zhang,Ying Liu,Rui Xu,Wen Ge,Yubao Chen
Under simultaneous illumination and heating, Jatropha oil was converted into jet–fuel components over modified catalysts. XRD , HRTEM, N 2 adsorption–desorption, XRF , NH 3 /CO–NH 3 –TPD/CO–TPD, UV–Vis and TG–DTG–MS were employed to determine the surface morphology and acidic site content of the modified catalysts. Through the characterizations and experimental results, the band gap of the catalysts modified with titanium dioxide was found to be significantly reduced, which enhanced the visible light adsorption of the catalysts. Moreover, the catalyst loaded with Pt contained the highest amount of weakly acidic sites, which led to the highest conversion and selectivity for the Pt/TiO 2 –HZSM–5 catalyst at 100 °C and 0.4 MPa H 2 pressure. In addition, the pathway of photocatalytic decarboxylation and catalytic cracking of Jatropha oil was found to involve a cascade reaction from fatty acid to C n–1 alkane and eventually to cracking products.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiayu Zhang,Mingwei Yan,Guangchao Sun,Kaiqi Liu
A novel and cost-effective TiO 2 nanofiber membrane on porous fly ash ceramic as support (TNM-PFACS), using fly ash, graphite, and industrial rutile as raw materials, was successfully obtained based on the semi-dry press and hydrothermal process. The phase composition and micro-morphology of TNM-PFACS were characterized and analyzed by XRD, EDS, SEM, and TEM. Furthermore, it was discussed about simultaneous removal of heavy metal ions (Cu(II), Cd(II), and Cr(VI)) and rhodamine B, involving the adsorption and photodegradation process. The results indicated that the removal rate (90.15%) and adsorption capacity (9.56 mg/g) of Cu(II) was maintained, while the adsorption of Cd (II) was inhibited. In the photodegradation process, rhodamine B promoted the reduction of highly toxic Cr(VI) to Cr(III), and the highest removal rate of Cr(VI) reached 97.09%. TNM-PFACS presented simultaneous removal of heavy metal ions and rhodamine B through synergism and antagonism in the adsorption and photodegradation process, which can be applied as a simpler and cost-effective material in industrial wastewater treatment.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Weiwen Wang,Hui Zhao,Peng Pan,Kang Xue,Zisheng Zhang,Jihai Duan
In order to enhance the photocatalytic activity of TiO 2 under visible light, Ag nanoparticles were introduced into tridoped B–C–N–TiO 2 (TT) catalyst by photoreduction deposition. Ag/B–C–N–TiO 2 (ATT) catalysts with the functions of reducing band gap and carrier recombination were prepared. At the same time, the effect of the amount of Ag on the photocatalytic performance of ATT catalyst was investigated. Through XRD , XPS , PL and other characterization methods, the (211)/(101)/Ag interface heterojunction mechanism similar to the traditional Z-scheme heterojunction was proposed. The intervention of Ag nanoparticles changed the P–N interface heterojunction between (211)/(101) to the (211)/(101)/Ag Z-scheme interface heterojunction. The results show that ATT catalyst exhibits the highest photocatalytic activity when the molar amount of Ag is 0.005% with the MB degradation rate of the ATT catalyst (0.01707 min −1 ), which is 14.59 times of TiO 2 (0.00117 min −1 ) and 2.02 times of TT (0.00847 min −1 ). In addition, the four cycles efficiencies of ATT for MB degradation were all above 94.00%.This study reveals the possibility of construction of Z-scheme heterojunctions between precious metal nanoparticles and different interfaces of TiO 2 , and provides a reference for the construction of Z-scheme interface heterojunctions.
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Energy Technology
·
2020
·Vol. 8
·期 6
·2000034
·
IF 3.404
Xiaoyan Wang,Ya-Jun Cheng,Qing Ji,Suzhe Liang,Liujia Ma,Zhuijun Xu,Xiuxia Zuo,Jian-Qiang Meng,Jin Zhu,Peter Müller-Buschbaum,Yonggao Xia
TiO 2 is a promising lithium-ion battery anode due to its good operation safety enabled by its voltage profile. However, the intrinsically low electronic/ionic conductivity and moderate reversible capacity compromise its potential for practical applications. It is proposed in this work to incorporate super-small sized metallic high capacity tin-based nanoparticles into TiO 2 /carbon nanohybrids, coupled with in situ generation of mesoporous structures. Difunctional methacrylate resin monomers are used as the solvent and carbon source, followed by carbonization and hydrofluoric (HF) etching treatment. The precursors of TiO 2 , tin-based component, and SiO x porogen agent are homogeneously integrated into the cross-linking network at a molecular level. High reversible capacities, excellent rate capability, and good capacity retention are achieved simultaneously due to synergistic effects from the tin-based component bearing high capacity and good electron conductivity, and mechanical buffer medium of the mesoporous structures. Reversible capacities of 452 mAh g −1 are achieved after 400 cycles at 200 mA g −1 . High rate capacity of 131 mAh g −1 is maintained at 5 A g −1 . The overall capacities are increased by more than 2 times compared with the capacities of the tin-free TiO 2 /C and pristine TiO 2 /SnO 2 /Sn/SiO x /C nanohybrids.
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BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Yan Sun,Peipei Li,Yu Zhu,Xiaohua Zhu,Youyu Zhang,Meiling Liu,Yang Liu
A sensitive electrogenerated chemiluminescence (ECL) biosensor for glucose was developed based on in situ growth of TiO 2 nanowires on Ti 3 C 2 MXenes (TiO 2 –Ti 3 C 2 ) as the nanoplatform. Via tuning the alkaline oxidation time, different amount of TiO 2 nanowires can be found on MXenes. An ECL biosensor for glucose was constructed by covalent immobilization of glucose oxidase (GODx) on the glycine functional TiO 2 –Ti 3 C 2 surface, with the ECL signal depending on the in-situ formation of H 2 O 2 via the specifically catalysis of glucose by GODx, resulting in the apparent increase of ECL signal. The TiO 2 –Ti 3 C 2 can also act as the catalyst for the oxidation of H 2 O 2 into O 2 to enhance the ECL of luminol. Based on this strategy, a highly sensitive ECL biosensor for glucose was obtained in wide concentration range of 20 nM-12 mM with a low detection limit of 1.2 nM (S/N = 3). The synergistic effects of large surface area, excellent conductivity, and high catalytic activity of the TiO 2 –Ti 3 C 2 make the sensor highly sensitive toward glucose; the specific enzyme catalysis reaction promises excellent selectivity of the ECL sensor. The proposed biosensor has been employed to detect glucose in human serum, fruits, and sweat samples with excellent performance, providing a universal approach for glucose in various samples, which shows great prospect in clinical diagnostics and wearable sensors .
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Shen Shen,Hongbo Wang,Jiajia Fu
Three-dimensional (3D) graphene aerogel (3DGA) is an emerging photocatalyst support that imparts improved charge-carrier mobility. In this study, a 3DGA framework doped with carbon-quantum-dot-decorated TiO 2 nanosheets (3DGA@CDs-TNs) is fabricated by a hydrothermal method. 3DGA@CDs-TNs is then applied as a catalyst to degrade organic pollutants in aqueous solutions. The degradation rates for Cong-red (CR, 120 mg L -1 ), Rhodamine B (RhB, 20 mg L -1 ), and colorless tetracycline (TC, 100 mg L -1 ) reach 98.7% (after 2 h), 97.6% (after 2 h), and 99.8% (after 40 min), respectively, under visible-light irritation, and these rates are much higher than those for CDs-TNs and 3DGA alone. Meanwhile, the dyed wastewater was collected to verify the practicability of 3DGA@CDs-TNs. These enhanced efficiencies arise from the unique 3DGA@CDs-TNs configuration, in which the conductive 3DGA aerogel acts as an effective electron mediator that connects the CDs-TNs composite fragments, providing channels for fast charge transfer. In addition, 3DGA@CDs-TNs also exhibits excellent stability during recycling experiments, confirming its durability and practicability.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yaxin Deng,Shuxian Li,Xuandong Li,Rui Wang,Xin Li
Planar structures for halide perovskite solar cells with the high efficiencies typically use high-temperature processed TiO 2 as the electron transporting layers (ETLs). Here, we demonstrate that an in-situ passivation strategy for TiO 2 film through the introduction of HI during low-temperature preparation process. HI not only controls hydrolysis of TiO 2 precursor but also eliminates defects and suppresses trap states in TiO 2 film. Meanwhile, the double-layer architecture is constructed by coating TiO 2 with SnO 2 layer, the double ETLs can improve the photovoltaic performance of methylamine lead iodide (MAPbI 3 ) perovskite solar cells. The TiO 2 (HI)/SnO 2 ETL can effectively reduce the interfacial charge recombination and facilitate electron transfer. More importantly, the preparation of TiO 2 and SnO 2 are totally performed at low-temperature (150 °C) and the devices are fabricated in uncontrolled ambient conditions. Our best-performing planar perovskite cell using such a TiO 2 (HI)/SnO 2 ETL has achieved a maximum power conversion efficiency (PCE) of 16.74%, and the devices exhibit good stability which maintaining 85% and 83% of their initial efficiency after heating at 100 °C for 22 h and under illuminating upon 1 sun irradiation for 6 h, respectively. Our results suggest a new approach for further improving the stability of PSCs fabricated in the air condition.
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