ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Congcong Liu,Haijun Su,Chenyang Wei,Keyu Xie,Hongqiang Wang,Peng Zhai,Min Guo,Jun Zhang,Lin Liu
A high-quality TiO 2 electron transport layer (ETL) should possess a good energy-level alignment, perfect electron mobility, and excellent charge extraction efficiency. Nevertheless, the poor conductivity of amorphous TiO 2 film from low-temperature preparation is an inherent problem while the high-crystallined TiO 2 after high-temperature sintering (>450 °C) limits its application in the low-cost fabrication and flexible substrates. Here, we develop a low-temperature approach to in situ functionalize TiO 2 nanocrystals with dopamine molecules (DA-TiO 2 NCs) in the synthesis of the nanocrystals through a non-aqueous sol-gel method. We systematically investigate the tunable electronic properties of TiO 2 NCs with the variable DA modification and confirm that DA-TiO 2 can tailor the energy level alignment as well as increase the charge-extraction capacity, substantially reducing charge accumulation between the TiO 2 and perovskite layer. The in situ anchored amino groups (-NH 3 + ) not only preferentially boost the in-plane growth of perovskite grains but also induce the red-shift absorption of perovskite via the strong electrostatic interaction with Br − ions. Based on the DA-TiO 2 NCs ETLs, the power conversion efficiency of the fully ambient-processed planar FA x MA 1-x PbBr y I 3-y PSCs is optimized to 19.45%.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 26
·11076-11084
·
IF 3.288
Yin'an Zhu,Ye Pan,Enming Zhang,Weiji Dai
Hetero-junctions are widely considered as efficient and promising separators for photogenerated electron–hole pairs in photocatalytic processes. In this work, a self-assembled urchin-like TiO2@Ag–CuO hetero-junction was fabricated via a two-step approach combining a dealloying method with calcination using alloy ribbons as the precursors. This nanostructure exhibits enhanced degradation efficiency toward tetracycline hydrochloride (TC) under visible light irradiation, achieving a degradability of 82.86% after 3 hours, higher than those of P25, CuO, TiO2@Ag and TiO2@CuO binary hetero-junctions. The photocurrent response and electrochemical impedance spectroscopy studies reveal that the TiO2@Ag–CuO hetero-junction possesses an excellent separation ability and a long lifespan with regard to photogenerated electron–hole pairs, which may contribute to its enhanced photocatalytic ability. In addition, this unique nanostucture maintained good degradation stability even after four-cycle utilization. The findings of this work provide new ideas to prepare multicomponent hetero-junctions for water purification.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Jinze Lyu,Lele Zhou,Junwei Shao,Zhen Zhou,Junxian Gao,Ji Li,Yuming Dong,Zhenyu Wang
Light absorption efficiency directly affects the photocatalytic degradation rate of volatile organic compounds (VOCs). Herein, we synthesized a TiO 2 hierarchical structure with a nanoscale hollow cavity and ultrathin nanosheet-assembled shell to efficiently harvest light. The micromorphology, light absorption, and charge separation of the prepared catalysts were analyzed via transmission electron microscopy, scanning electron microscopy, UV–vis diffuse reflectance, and surface photovoltage measurements. The adsorption and photocatalytic degradation of toluene and acetone were conducted to evaluate the catalysts’ performance in VOC elimination. The prepared TiO 2 /H 2 Ti 3 O 7 composite, FTHS, exhibited a spiny hollow morphology at the nanoscale, thereby considerably increasing its surface area and light absorption capacity compared with conventional TiO 2 hollow spheres (THS). Moreover, the optimized structure of FTHS enhanced the charge separation and electron accumulation on the catalysts’ surface. Owing to these advantages, FTHS showed evidently higher adsorption amount, removal rate, and mineralization efficiency of toluene and acetone than THS.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Ying Wang,Jian He,Pan Wu,Dingyuan Luo,Runhua Yan,Hao Zhang,Wei Jiang
In this study, a common refractory aquaculture hybrid wastewater containing copper and tetracycline (TC) was treated to simultaneously remove such pollutants through a formic-acid-assisted photocatalysis process with TiO2 as the photocatalyst. The results show that pure aqueous TC can be completely photodecomposed by TiO2, although the removal rate of pure Cu ions through photocatalysis without the addition of a scavenger can be neglected. For simultaneously photodegrading TC–Cu(II) hybrid wastewater, the TC degradation rate is accelerated, whereas the Cu(II) removal rate remains at 20% through adsorption. TC cannot promote the photoreduction of Cu(II) as a sacrificial agent, and its intermediate products form a stable complex with Cu(II), hindering further reduction. The addition of formic acid effectively releases Cu ions from the complex as a pH regulator and enhances the photocatalysis process as a hole scavenger. Through the addition of formic acid after complete TC photooxidation, the final chemical oxygen demand (COD) and Cu concentration were only 8 and 0.4 mg/L, respectively. This study provides a simple and promising method for simultaneously treating TC–Cu(II) hybrid wastewater using formic-acid-assisted TiO2 photocatalysis.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Na Zhao,Yang Hu,Jinlong Du,Gang Liu,Bowei Dong,Yuying Yang,Jing Peng,Jiuqiang Li,Maolin Zhai
Developing non-noble-metal cocatalysts is essential for the large-scale implementation of solar-driven H 2 production technology, but still remains a great challenge. In this work, Ti 3 C 2 T x MXene coupled CdS nanostructures are fabricated via one-step gamma-ray radiation-induced reduction in ambient conditions. By subsequent alkaline treatment, a novel cocatalyst of carbon supported amorphous TiO 2 nanosheets (denoted as aTiO 2 -C) is derived from Ti 3 C 2 T x /CdS to form aTiO 2 -C/CdS nanocomposites. The prepared aTiO 2 -C/CdS nanocomposites with cyclability achieve a H 2 evolution rate of 1.48 mmol·g −1 ·h −1 under visible-light illumination, which is 6.4 and 7.0 times greater than that of pristine Ti 3 C 2 T x /CdS and P-CdS, respectively. The oxygen vacancies in aTiO 2 -C cocatalysts are revealed to act as electron trapping sites to facilitate the transfer of photoexcited electrons and boost photoactivity. Further, the electronic interaction between CdS and aTiO 2 -C prevents Cd 2+ from leaching and thus enhances photostability. The results of this work may guide the rational design of viable cost-effective cocatalysts in solar-to-chemical energy conversion and beyond.
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Advanced Composites and Hybrid Materials
·
2020
·Vol. 3
·期 3
·402-414
·
IF 0
Liu Chao,Lin Yang,Dong Yufei,Wu Yingke,Bao Yan,Yan Hongxia,Ma Jianzhong
In this paper, a novel Ag nanowires/TiO 2 nanosheets/graphene nanocomposite was fabricated via a facile method of hydrothermal and calcination, and then the water treatment performance of it was evaluated for methylene blue (MB) and Escherichia coli removal. The as-prepared Ag nanowires/TiO 2 nanosheets/graphene nanocomposite was characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), UV–visible diffuse reflection spectroscopy (DRS), molecular dynamics simulation, and gas chromatography–mass spectrometry (GC-MS). All data revealed that the Ag/TiO 2 /graphene nanocomposite showed a rich cell structure. The photocatalytic activity of Ag/TiO 2 /graphene nanocomposite is higher than those of pristine TiO 2 nanosheets and TiO 2 /graphene nanocomposite. Under optimized conditions, the degradation efficiency was 100% and 71% for MB (30 mg/L) and with 10 mg Ag/TiO 2 /graphene nanocomposite under UV and visible light irradiation for 2 h, respectively. Ag/TiO 2 /graphene also showed excellent bacteria-killing activity. Meanwhile, the Ag/TiO 2 /graphene nanocomposite exhibited microstructure stability and cyclic stability. The water treatment performance was enhanced mainly attributed to the excellent adsorption performance of graphene and the high efficiency in separation of electron–hole pairs induced by the remarkable synergistic effects of TiO 2 , Ag, and graphene. On the basis of the experimental results, the photocatalytic mechanism and MB degradation mechanism were proposed. It is hoped that our work could avert the misleading message to the readership, hence offering a valuable source of reference on fabricating composite photocatalyst with stable microstructure and excellent performance for their application in the environment clean-up.
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PubMed
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Bin Zhang,Xu He,Xiaohan Ma,Qinghua Chen,Guocheng Liu,Yuanming Zhou,Dong Ma,Chunyue Cui,Jun Ma,Yanjun Xin
To improve the redox performance and light absorption property, the 2D/0D g-C 3 N 4 /TiO 2 heterojunction photocatalyst were successfully fabricated by co-annealing process based on melamine powder and ultrafine TiO 2 nanoparticles (about 9.87 nm) obtained from electrochemical etching technology. The surface micromorphology, crystal structure, basic element composition, chemical structure, specific surface and optical performance were analyzed by SEM-EDS, TEM, HR-TEM, XRD, XPS, FTIR and Ultraviolet–visible diffuse reflection spectra (UV–vis DRS). The photocatalytic performance of g-C 3 N 4 /TiO 2 photocatalyst was assessed by the degradation of tetracycline hydrochloride (TC) under simulated sunlight irradiation. The results showed that the obtained TiO 2 powder had extremely smaller particle size and higher photocatalytic activity than commercial P25. The coupling of 0D TiO 2 nanoparticles and 2D g-C 3 N 4 nanosheet further promoted the visible light absorption performance of TiO 2 . The unique g-C 3 N 4 /TiO 2 heterojunction photocatalyst exhibited remarkable photocatalytic performance for the degradation of TC, whose degradation rate could reach to 99.40% under 120 min irradiation. The kinetic constant of the g-C 3 N 4 /TiO 2 photocatalyst was 1.48 times of that of TiO 2 . The ESR results confirmed ·OH and ·O 2 – radicals produced in the photocatalytic process. This work could provide an effective reference for the fabrication of ultrafine TiO 2 powder and binary heterojunction photocatalyst with excellent photocatalytic activity for organic pollutants degradation in water purification.
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SOLAR ENERGY
·
2019
·
IF 4.674
Lei Shi,Xinzhi Wang,Yanwei Hu,Yurong He
The significant improvement in photocatalytic activity achieved in recent years has generated widespread attention due to its utilization in solar energy. In this study, two shapes of magnetic nanoparticles were synthesized using hydrothermal method. The magnetic nanoparticles exhibited superior photocatalytic activity for water treatment, which takes into consideration the photo-thermal conversion of magnetic nanoparticles. The effect of morphology on the photo-degradation was analyzed by the specific surface area measurement and photoluminescence test. Furthermore, the suspension degradation rate with magnetic nanoparticles was enhanced by ~200% compared to a commercial photocatalyst. Moreover, the photo-degradation efficiency further increased from 96.4 to 99.6% with the magnetic field intensity increased because of the absorbance ability enhancement. This result indicates that the photocatalytic activity of a magnetic photocatalyst can be enhanced through photo-thermal conversion and magnetic field regulation, which expands the application of solar power technology.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 16
·B1727
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IF 3.12
Shuting Cheng,Guanglei Chu,Zengning Liu,Yemin Guo,Xia Sun
A novel electrochemiluminescence (ECL) immunosensor was fabricated by using titanium dioxide (TiO2) and antimony tin oxide (ATO) nanocomposite as electrode modified material to detect aflatoxin B1 (AFB1). Luminol with ECL characteristics was modified on the surface of a platinum electrode to prepare the luminescent electrode. The buffer solution contained hydrogen peroxide (H2O2) was used to monitor the ECL signals owing to the chemiluminescence properties of luminol-H2O2 in alkaline solution. TiO2 and ATO were doped with chitosan to form TiO2@ATO nanocomposite, which was modified on the electrode to enhance the ECL intensity by accelerating the electron transfer and provided more binding sites for aflatoxin B1 antibody (Ab) and AFB1. An ECL immunosensor was prepared for AFB1 detection by modifying Ab and bovine serum albumin (BSA) successively. The specific combination of AFB1 and Ab weakened the ECL intensity, thus the concentration of AFB1 was determined according to the strength change of ECL signal. Under optimum conditions, the constructed immunosensor provided a wide linear range from 1.0 × 10−2 to 1.0 × 103 ng mL−1 with a detection limit of 0.03 ng mL−1 (S/N = 3) and showed great specificity and high stability. Furthermore, the proposed immunosensor successfully demonstrated its applicability for detecting AFB1 in peanut oil samples.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhen Zhou,Junxian Gao,Guangsheng Zhang,Yuming Dong,Zhenyu Wang,Ji Li,Jinze Lyu
The interfacial interaction between graphene and semiconductors significantly affects volatile organic compound (VOC) adsorption and charge separation. Herein, we optimize the interaction between TiO 2 and reduced graphene oxide (rGO) by reducing the Fermi level of GO with Cu 2+ . The surface photocurrent (SPC) and surface photovoltage (SPV) of the prepared materials were tested under different atmospheres to study the effect of enhanced interfacial interactions on charge separation. The results revealed that Cu 2+ treatment tended to induce the TiO 2 nanoparticles to form a thicker and more uniform layer on the rGO surface. The composition of TiO 2 nanoparticles and rGO generated a 2D arranged porous structure that had both hydrophobic rGO and hydrophilic TiO 2 as the pore walls. The amount of adsorbed toluene for the optimized TiO 2 -graphene (t-TiO 2 /rGO) was 1.21-fold higher than that for TiO 2 /rGO. The SPC and SPV results showed that the optimized contact between TiO 2 and rGO significantly enhanced photogenerated electron mobility and toluene-induced hole utilization. Given the advantages in adsorption and charge separation, the photocatalytic reaction rates of t-TiO 2 /rGO were 1.47-fold and 1.91-fold higher than those of TiO 2 /rGO and porous TiO 2 , respectively.
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RSC Advances
·
2019
·Vol. 9
·期 63
·36907-36914
·
IF 3.049
Xiongrui Jiang,Zhiyao Yan,Jing Zhang,Junzheng Gao,Wanxia Huang,Qiwu Shi,Hengzhong Zhang
Black TiO2 has received tremendous attention because of its lattice disorder-induced reduction in the TiO2 bandgap, which yields excellent light absorption and photocatalytic ability. In this report, a highly efficient visible-light-driven black TiO2 photocatalyst was synthesized with a mesoporous hollow shell structure. It provided a higher specific surface area, more reaction sites and enhanced visible light absorption capability, which significantly promoted the photocatalytic reaction. Subsequently, the mesoporous hollow black TiO2 with different lattice disorder-engineering degrees were designed. The structure disorder in the black TiO2 obviously increased with reduction temperature, leading to improved visible light absorption. However, their visible-light-driven photocatalytic efficiency increased first and then decreased. The highest value can be observed for the sample reduced at 350 °C, which was 2-, 1.4- and 5-fold that of the samples reduced at 320 °C, 380 °C and 400 °C, respectively. This contradiction can be ascribed to the varied functions of the surface defects with different concentrations in the black TiO2 during the catalytic process. In particular, the defects at low concentrations boost photocatalysis but reverse photocatalysis at high concentrations when they act as charge recombination centers. This study provides significant insight for the fabrication of high-efficiency visible-light-driven catalytic black TiO2 and the understanding of its catalysis mechanism.
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Scientific Reports
·
2019
·Vol. 9
·期 1
·1-10
·
IF 4.011
Liu Gonggang,Lu Zhou,Zhu Xiu,Du Xiaoqing,Hu Jinbo,Chang Shanshan,Li Xianjun,Liu Yuan
Bamboo with the outstanding properties, such as good mechanical strength, fast growth rate and low growth cost, is considered as one of utilitarian structural nature materials. But bamboo is easy to get mildewed resulting in disfiguration and fungi corrosion. In this work, a facile method was developed to improve the mildew-proofing capability of bamboo. Mussel-inspired polydopamine (PDA) with biomimetic adhesion function and highly active functional groups was employed to immobilize highly-dispersed Ag and TiO 2 nanoparticles on the surface of bamboo via an in-situ growth method. Integrating the uniform PDA coating, photocatalytic function of TiO 2 nanoparticles and bactericidal role of Ag nanoparticles, the mildew-proofing capability of bamboo is enhanced significantly. The results show a non-covalent interaction is more likely to account for the binding mechanism of PDA to bamboo. And the prepared bamboo samples show good photocatalytic performance and have excellent resistance leachability. Meanwhile, the mildew-proofing property of prepared bamboo sample was greatly improved.
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