Catalysts
·
2020
·Vol. 10
·期 10
·1126
·
IF 3.52
Jun Liu,Xuli Li,Haobo Hou,Min Zhou
To further boost the charge separation and photocatalytic activity of TiO2under visible light, the anatase–rutile mixed-phase nitrogen-doped (N-doped) TiO2nanoparticles were successfully synthesized through a facile one-step calcining procedure using TiN as raw materials. The crystal phases, morphologies, chemical compositions, textural structures, and optical properties of as-obtained N-doped TiO2were characterized by the corresponding analytical techniques. The photocatalytic activities of as-fabricated samples were evaluated by degrading 4-chlorophenol (4-CP) and methylene blue (MB) aqueous solution under visible light irradiation. The results revealed that the ratio of rutile to anatase increased with the improvement of sintering temperature, and the sample prepared at 500 °C had the best photocatalytic activity. This might be because it possessed the most appropriate rutile/anatase proportion as well as the nitrogen doping. The transient photocurrent responses, photoluminescence spectra (PL) measurements, and active species trapping experiments were implemented to disclose the photocatalytic mechanism. This work will provide a further insight into the synthesis of highly efficient N-doped TiO2photocatalysts for organic contaminant removal.Keywords:N-doped TiO2;charge separation;photocatalytic activity
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Coatings
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2022
·Vol. 12
·期 5
·585
·
IF 3.236
Wen Sun,Xuankun Li,Jingtao Zou,Han Guo
TiO2is widely used for the photocatalytic degradation of organic pollutants in wastewater, but the practical applications of the photocatalyst are limited due to its poor visible light absorption and low recovery rate. In this study, high production of nitrogen-doped TiO2was achieved by a hydrolysis precipitation method; the obtained N-TiO2had a small crystallite size and good dispersibility. The effect of calcining temperature on the photocatalytic performance of N-TiO2was evaluated through the degradation of methylene blue (MB) in a blue light LED irradiation cylinder, it was found the N-TiO2calcined at 400 °C showed the best photocatalytic activity. Then the N-TiO2was immobilized on SiC ceramic foam by dip-coating with PVA as the binder. The prepared N-TiO2/SiC foam showed excellent photocatalytic activity under blue light LED irradiation; as high as 96.3% of MB was degraded at optimum conditions. After five cycles of MB photodegradation, the photocatalytic activity of N-TiO2/SiC foam only changed slightly, which makes it a promising photocatalytic material for wastewater treatment.Keywords:nitrogen-doped TiO2;SiC foam;LED irradiation;photodegradation;methylene blue
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Micromachines
·
2023
·Vol. 14
·期 4
·870
·
IF 3.4
Huan Wang,Mingxuan Dong,Baorui Shao,Yaodan Chi,Chao Wang,Sa Lv,Ran Duan,Boqi Wu,Xiaotian Yang
N-TiO2/Ni(OH)2nanofiber was successfully prepared by combining the electrospinning and solvothermal method. It has been found that under visible light irradiation, the as-obtained nanofiber exhibits excellent activity for the photodegradation of rhodamine B, and the average degradation rate reaches 3.1%/min−1. Further insight investigations reveal that such a high activity was mainly due to the heterostructure-induced increase in the charge transfer rate and separation efficiency.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Qingjie Wang,Yan Cui,Rongjiao Huang,Laifu Zhong,Peng Yan,Shilin Zhang,Qihang Zhao,Denghui Jiang,Aidong Tang,Huaming Yang
Completely decomposing low concentrations of organic pollutants in neutral wastewater under sunlight irradiation poses an important challenge for water treatment systems. A combination of photocatalysis and Fenton techniques is expected to solve this problem. Herein, a novel heterogeneous Fenton reaction system with good photocatalytic performance was developed by activating peroxymonosulfate (PMS) via nitrogen-doped TiO 2 (N-TiO 2 ) and acid-activated sepiolite (ASep) nanocomposites (N-TiO 2 /ASep). The N-TiO 2 /ASep nanocomposites were prepared by anchoring the N-TiO 2 onto ASep. The electronic structure of the Ti 3+ self-doped N-doped TiO 2 was regulated by calcining N-TiO 2 /ASep nanocomposites under different atmospheres. Methyl orange degradation, influencing factors, and reaction mechanisms under visible light irradiation were investigated in detail. The results indicated that, under visible light irradiation, N-TiO 2 /ASep alone had almost no photocatalytic activity, and PMS alone exhibited only 20% photocatalytic activity. However, the N-TiO 2 /ASep(N 2 )/PMS system degraded about 95% of the methyl orange within 60 min. By contrast, the reaction rate constant of N-TiO 2 /ASep(N 2 )/PMS was nearly 5.44 times higher than that of TiO 2 /PMS . This excellent performance was attributed to the synergy among N-TiO 2 , ASep, and PMS. Moreover, the calculated carrier density and photocurrent density of N-TiO 2 /ASep (N 2 ) was nearly 3.75 and 2.80 times that of N-TiO 2 /ASep (Air), suggesting that N-TiO 2 /ASep(N 2 ) had a greater carrier separation efficiency because more Ti 3+ species were provided. Furthermore, radical scavenger experiments and electron spin resonance testing demonstrated that h + , O 2 − , SO 4 − and OH were the important radicals. More importantly, photocatalytic performance was optimal at pH 7 in the presence of various ions. The results of this study expanded the applications of PMS and advanced oxidation processes. This work provides the necessary scientific basis for further studies of organic pollutant remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Dongxing Tan,Jianling Zhang,Jinbiao Shi,Shaopeng Li,Bingxing Zhang,Xiuniang Tan,Fanyu Zhang,Lifei Liu,Dan Shao,Buxing Han
To develop photocatalysts with desirable compositions and structures for improving the efficiency and selectivity of CO2 conversion to CH4 under mild conditions is of great importance. Here, we design an effective photocatalyst of bimetal (Ag/Pd) nanoalloys supported on nitrogen-doped TiO2 nanosheet for CO2 conversion. Such a novel photocatalyst combines multiple advantages of abundant Ti3+ ions, oxygen vacancies, and substitutional nitrogen that are favorable for catalyzing CO2 reduction. It was found that CO2 could be efficiently transformed to CH4 under mild conditions, i.e., in aqueous solution and at atmospheric pressure and room temperature. The maximum production rate of CH4 can reach 79.0 μmol g–1 h–1. Moreover, the Ag/Pd bimetals supported on N-doped TiO2 nanosheet exhibit high selectivity to CH4. The as-synthesized photocatalyst can be well recycled for CO2 reduction.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2023
·
IF 3.8
Jun Li,Xiangbin Sun,Yaping Zhang,Tingjun Lu,Zeyuan Wang,Yufeng He,Rongmin Wang
Organic dyes pollution (especially methylene blue) in wastewater has seriously affected the livelihood and health of human beings. To address this issue, in this study, loess-based N-doped TiO 2 (NTiO 2 @ALS) photocatalysts were fabricated through in situ deposition of N-doped TiO 2 (NTiO 2 ) nanoparticles on the surface of acidified loess (ALS) particles by sol-gel method. The characterization was performed by XRF, SEM, FT-IR, XRD, XPS, UV–Vis DRS and BET, and small nanoparticles of NTiO 2 were found to be perfectly bound to the surface of the ALS particles. In addition, what factors affecting the photocatalytic activity were explored and it was found that calcination at 450 °C for 2 h was the best condition, under which the samples possessed the highest degradation efficiency under visible light irradiation. Furthermore, NTiO 2 @ALS was applied to the degradation of methylene blue (MB) and the mechanism of pre-adsorption and photocatalytic degradation was also investigated. Surprisingly, methylene blue (MB) could be degraded by 99.6% post pre-adsorption. This excellent result was attributed to the existence of dual coordination between catalytic active center (NTiO 2 ) and support (ALS) in NTiO 2 @ALS. Most significantly, the introduced ALS particles achieved the effective dispersion of small NTiO 2 nanoparticles and increased the specific surface area of materials, which greatly improved photocatalytic performance and adsorption properties. In brief, NTiO 2 @ALS holds promising application potential for the removal and degradation of organic dyes from wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 10
·338
·
IF 3.553
Xiaobo Pan,Xinyue Liang,Longfang Yao,Xinyi Wang,Yueyue Jing,Jiong Ma,Yiyan Fei,Li Chen,Lan Mi
TiO2nanoparticles modified with phthalocyanines (Pc) have been proven to be a potential photosensitizer in the application of photodynamic therapy (PDT). However, the generation of reactive oxygen species (ROS) by TiO2nanoparticles modified with Pc has not been demonstrated clearly. In this study, nitrogen-doped TiO2conjugated with Pc (N-TiO2-Pc) were studied by means of monitoring the generation of ROS. The absorbance and photokilling effect on HeLa cells upon visible light of different regions were also studied and compared with non-doped TiO2-Pc and Pc. Both N-TiO2-Pc and TiO2-Pc can be activated by visible light and exhibited much higher photokilling effect on HeLa cells than Pc. In addition, nitrogen-doping can greatly enhance the formation of1O2and •O2−, while it suppresses the generation of OH•. This resulted in significant photodynamic activity. Therefore, N-TiO2-Pc can be an excellent candidate for a photosensitizer in PDT with wide-spectrum visible irradiation.Keywords:titanium dioxide;phthalocyanine;reactive oxygen species;photodynamic therapy
研究领域:
材料科学
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生物医学工程
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化学
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癌症治疗
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DOI
PubMed
高影响因子
ENERGY & FUELS
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2024
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IF 5.2
Dechao Wang,Lin Chen,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Rong Chen,Qiang Liao
Development of a highly performing heterojunction photoanode is significantly important for photoelectrochemical cells. Herein, a novel strategy is proposed to construct a protonated g-C3N4 nanosheets/nitrogen-doped TiO2 photoanode inspired by polydopamine microspheres. The polydopamine microspheres can enhance the adsorption of protonated g-C3N4 nanosheets via electrostatic interaction, facilitating heterojunction formation. Moreover, the addition of the polydopamine microspheres into the preparation process can not only dope a nitrogen element into TiO2, improving solar energy utilization, but also create a vigorous pore structure in the photoanode, promoting mass transport and light scattering. Besides, the specific surface area can also be increased. Owing to these merits, the photoelectrochemical activity of this newly developed photoanode is greatly improved. Furthermore, the superiority of this photoanode is evaluated by integrating it into a photoelectrochemical cell for simultaneous wastewater treatment and power generation. The maximum power density generated by the newly developed protonated g-C3N4 nanosheets/nitrogen-doped TiO2 photoanode is about 138.5% and 40.9% higher than the TiO2 photoanode and the protonated g-C3N4 nanosheets/TiO2 photoanode prepared without using the polydopamine microspheres, respectively. The present study provides a novel strategy for developing a highly performing heterojunction photoanode.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
CATALYSIS TODAY
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2022
·
IF 6.562
Yunfei Ma,Wenhui Yue,Zehong Xu,Ziwei Ye,Jinlong Zhang
Composite nanoparticles consisting upconversion nanoparticles (β-NaYF 4 :Yb/Er) and nitrogen doped TiO 2 nanoparticles were constructed via a chemical assembly method. Efficient energy transfer was enabled since the upconverted energy matched up with the band gap of N-TiO 2 . This enables the resulting composite nanoparticles to possess excellent Rhodamine B (RhB) degradation activity under near infrared (NIR) light irradiation.
研究领域:
材料科学
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环境科学
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纳米技术
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DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2015
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IF 4.152
Xiaobo Pan,Jin Xie,Zheng Li,Maxin Chen,Mengyan Wang,Pei-Nan Wang,Li Chen,Lan Mi
As a second-generation photodynamic therapy (PDT) photosensitizer, aluminum phthalocyanine chloride tetrasulfonate (Pc) has gained great attention due to its high absorption at the red light region. Yet, its application in PDT is strongly limited by its low cellular uptake efficiency. In this report, nitrogen-doped TiO 2 nanoparticles (N–TiO 2 ) conjugated with Pc are synthesized by a two-step surface modification method. The N–TiO 2 –Pc products are characterized by Zeta potential, transmission electron microscopy and UV–vis absorption spectroscopy. The cellular uptake, intracellular distribution, cytotoxicity and the photokilling effect of the nanoparticles are studied on different cancer cell lines. Compared with Pc, the absorption spectrum of N–TiO 2 –Pc expands from red to UV region, resulting in a higher production of reactive oxygen species under visible light irradiation. In addition, the cellular uptake of Pc is largely improved by its carrier N–TiO 2 . The photokilling efficiency of N–TiO 2 –Pc is over ten times higher than that of Pc. The results suggest that N–TiO 2 –Pc is an excellent candidate as a photosensitizer in PDT.
研究领域:
材料科学
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纳米技术
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生物医学工程
·
肿瘤学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 36
·期 2
·183-188
·
IF 0.957
Zuo Jiaxiang,Jin Xin,Zeng Hui
Fresh EPF proteins from Liangzi Lake were employed as a template to synthesize hierarchically porous nitrogen-doped TiO 2 in a single process. The experimental results show that N-TiO 2 sample exhibits significantly enhanced visible-light photocatalytic activity in both chemical waste treatment and hydrogen production, and the visible-light photocatalytic activities vary with the concentrations of EPF proteins. The optimal concentration of protein is 600 mg·mL −1 and the degradation of RhB could be almost completed in just 25 min. Furthermore, the performance of as-synthesized TiO 2 as an electrode for Li-ion battery can be also regulated by the EPF proteins. Natural extrapallial fluid (EPF) proteins extracted from the same kind of mussels living in different regions have significantly different effects on the performances of TiO 2 as electrode materials for Li-ion battery. The present work highlights the unimaginable effects of natural organic matrix on the synthesis of advanced materials with optimized functional properties.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Hao Feng,Xiaohong Jiao,Rong Chen,Xun Zhu,Qiang Liao,Dingding Ye,Biao Zhang,Wei Zhang
In this work, the nitrogen-doped TiO 2 photocatalyst is synthesized and applied in a microfluidic all-vanadium photoelectrochemical cell for enhancing the solar energy storage. The use of the nitrogen-doped TiO 2 photoanode and the minimization design can ensure the visible-light response, increased specific surface area, vigorous pore structure and enhanced photon and mass transport as well as more uniform light distribution. Various characterizations are performed to evaluate the developed photocatalyst and microfluidic all-vanadium photoelectrochemical cell. The results confirm that the developed nitrogen-doped TiO 2 photoanode can provide both the extended absorption spectrum and the small anatase crystal size as well as the obviously enlarged specific surface area with plentiful pore structure. Because of these merits, the microfluidic all-vanadium photoelectrochemical cell with the nitrogen-doped TiO 2 photoanode yield the average photocurrent density of 0.103 mA/cm 2 during the long-term operation, which is much higher than those with the un-doped TiO 2 photoanode (0.086 mA/cm 2 ) and commercial P25 TiO 2 photoanode (0.073 mA/cm 2 ), presenting 19.8% and 41% improvements, respectively. The results demonstrate not only the promotion of the vanadium reversible redox pairs conversion but also the inherently excellent stability by the nitrogen-doped TiO 2 photoanode.
研究领域:
材料科学
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能源技术
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光电化学
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DOI
高影响因子
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