JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 14
·10191-10203
·
IF 3.442
Yu Han,Chen Fenghua,Ye Li,Zhou Heng,Zhao Tong
Ion co-doped photocatalysts with In 2 O 3 /TiO 2 heterostructure (In 2 O 3 /TiO 2 (m)) were prepared through a new polymeric precursor method. The In 2 O 3 /TiO 2 (m) precursor solution is of salient advantage in coating photocatalysts on various substrates and multiple modifications. The photocatalysts were facilely obtained after the calcination of precursors. Mass ratio of In/Ti was optimized according to their photocatalytic performances, and IT(m)-3 ( w In/Ti = 3%, modified by N, B co-doping) showed the best photocatalytic activity. The band gap was successfully narrowed to 2.37 eV, and In 2 O 3 /TiO 2 heterostructure was successfully constructed in the photocatalysts. Visible light absorption and separation of photoexcited carriers were significantly enhanced. Under visible light, NOX (20 mg/L in the water) was 100% photodegraded in 10 min, with 100% TOC removed in 25 min. The IT(m)-3-loaded quartz fabrics (ITQ) also showed excellent photocatalytic performance. The photocatalytic activity of ITQ was repeatable and stable in 45 rounds of recycle without centrifugation. Synergetic effect of heterostructure and element doping was considered contributing to the outstanding photocatalysis performance. The polymeric precursor method proposed in this work showed great potential in large-scale preparation and application of immobilized photocatalysts. The synergetic improvement through co-modifications showed its proper compatibility with modifications.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Cong Liu,Yanhui Li,Qian Duan
A novel hybrid organic/inorganic magnetic and thermal dual-responsive core-shell green photocatalyst zinc-tetracarboxyl-phthalocyanine- g -Fe 3 O 4 @SiO 2 @TiO 2 - g -poly( N -isopropyl acrylamide) had been prepared. Firstly, Fe 3 O 4 @SiO 2 @TiO 2 (FST) was prepared with core-shell structure, then thermosensitive poly( N -isopropylacrylamide) (PNIPAM) immobilized on the surface of 3-(methacryloxypropyl)-trimethoxysilane (MPS) modified FST by radical polymerization. Below the lower critical solution temperature (LCST), PNIPAM was hydrophilic to ensure them disperse uniformly in aqueous solution, and above LCST, PNIPAM became hydrophobic to accelerate the separation of FST from water. Secondly, zinc-tetracarboxyl-phthalocyanine (ZnTcPc) grafted on the surface of FST- g -PNIPAM by ester bonds and sensitized TiO 2 to broaden absorption light range from ultraviolet to visible region to enhance photocatalytic activity. The photocatalytic test revealed that the decomposition rate of Rhodamine B (RhB) came to 91.8% after 60 min with ZnTcPc- g -FST- g -PNIPAM under visible light. When exposed under sun light, the degradation efficiency reached to 96.9%. It meant ZnTcPc- g -FST- g -PNIPAM was more suitable for organic pollutant degradation in nature. In addition, ZnTcPc- g -FST- g -PNIPAM performed efficient synergistic effect of thermal (>LCST) and magnetic responded recovery for reusing. And the degradation rate of RhB under recyclable photocatalyst was reduced 9.6% after 4 cycles. Above all, ZnTcPc- g -FST- g -PNIPAM would be an efficient photocatalyst with magnetic and thermal dual-responsive recovery used in water treatment.
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ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Linwei Ji,Baojiang Liu,Yajie Qian,Qing Yang,Pin Gao
Composites coupling different semiconductors have attracted increasing attention for photocatalytic application owing to low visible-light absorption capability and weak photocatalytic activity of the single-component system. In this study, Bi 2 WO 6 /TiO 2 /rGO ternary composites, successfully synthesized by a facile hydrothermal method, were manifested as an outstanding visible-light-response photocatalyst for the disinfection towards E. coli . X-ray diffraction, Fourier-transform infrared, and X-ray photoelectron spectroscopy demonstrated that GO coupled in the composites was efficiently reduced to rGO during the hydrothermal process, which was greatly beneficial for enhancing light harvest, promoting charge separation, and improving photocatalytic disinfection activity. UV–vis diffuse reflectance spectra, photoluminescence and time-resolved photoluminescence, photocurrent measurements, and ultraviolet photoelectron spectroscopy clearly showed that Bi 2 WO 6 /TiO 2 /rGO composites had narrower band gap energy and much better suppression capability of photoinduced electron-hole recombination in comparison to the pure Bi 2 WO 6 and TiO 2 , and Bi 2 WO 6 /TiO 2 . The radical trapping results revealed that the photogenerated holes (h + ) were the leading active species responsible for the effective inactivation of E. coli under visible-light irradiation. Hence, the underlying mechanism for the enhanced photocatalytic disinfection performance of Bi 2 WO 6 /TiO 2 /rGO composites was proposed. This study provides new insight into the design and development of composite materials with enhanced photocatalytic activity, which can be an inspiring alternative for environmental application.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Xuelan Hou,Shaohong Jiang,Yongdan Li
A two-anode reduction (TAR) technique is adopted to prepare, in one step without the existence of gaseous hydrogen, black TiO 2 nanotubes co-doped with carbon and nitrogen. A sample prepared with the TAR technique for 2 min achieved the highest photocurrent response as 2.05 mA/cm 2 , which is 3 times as high as that of the pristine TiO 2 nanotubes. A synergistic effect between black hydrogenation and C, N co-doping is observed. The light absorption in the whole ultraviolet-visible (UV–vis) range is also greatly enhanced.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Xiao-Qiong Wu,Zai-Dong Shao,Qing Liu,Zongli Xie,Fei Zhao,Yu-Ming Zheng
Semiconductor photocatalysis has long been considered as a promising approach for remediation of polluted water. However, the high recombination rate of electrons and holes, as well as a low reaction rate, have impeded its large-scale applications. Therefore, it is of great importance to develop appropriate photocatalysts for promoting its practical application. In this study, a novel TiO 2 /SiO 2 /carbon electrospun nanofiber mat (TSC NFM) with flexibility and porous hierarchy has been successfully designed and fabricated by a facile method of electrospinning and carbonization . Characterization results show that the TSC NFM consists of closely-packed and well-distributed anatase (TiO 2 ) nanocrystals , amorphous SiO 2 nanoparticles , and carbon with interconnected meso - and macro -pores. The photocatalytic performance of the TSC NFM was evaluated by degrading rhodamine B and 4-nitrophenol in batch systems. The results show that TSC NFM exhibits a higher photocatalytic activity than TiO 2 /SiO 2 nanofiber mat, which does not contain carbon. The enhanced performance of the TSC NFM can be attributed to the improved adsorption capacity toward the organic pollutants due to the presence of carbon and to the enhanced interfacial charge separation between TiO 2 nanoparticles and carbon. Besides, the as-prepared TSC NFM displays good stability and reusability. Notably, the flexible TSC NFM can be used in a continuous-flow reactor to efficiently treat wastewater. Our work provides new insights into the fabrication of carbon-based inorganic nanofiber mats, which have great potential in water treatment.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ning Wan,Zipeng Xing,Junyan Kuang,Zhenzi Li,Junwei Yin,Qi Zhu,Wei Zhou
In-situ oxygen vacancy-mediated C-N-S-tridoped single crystal black TiO 2 (B) nanorods are smoothly manufactured. The sample preparation is divided into two steps, first of all, a simple hydrothermal process, followed by an in-situ solid-state chemical substitution method with calcination at 500 °C. We have a number of representations of the catalyst such as crystallinity, morphological structure, etc. by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy, respectively. This b-C-N-S-TiO 2 (B) has the advantages of Oxygen Vacancy, single crystal structure of nanorods, Ti 3+ self-doping, C-N-S-tridoped, so this sample band gap is narrow. Moreover, through the reduction of phenol and Cr(VI), we know the photocatalytic performance of the b-C-N-S-TiO 2 (B), the reduction efficiency of phenol and Cr(VI) is ∼6.1 times and ∼7 times of no doping samples, respectively, under visible light illumination. The predominant photocatalytic performances because of the synergetic action of Ti 3+ self-doping, C-N-S-tridoped, oxygen vacancy, and the 1D single crystal B phase nanostructure, favoring the separation and transportation of photogenerated charge carriers and the visible light utilization.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2019
·Vol. 35
·期 3
·370-376
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IF 1.071
Wu Shuo,Yang Xinlan,Zhao Yanqiu
A biomolecule-free photoelectrochemical(PEC) probe(denoted as Ru-1) was designed, synthesized and coupled with TiO 2 nanoparticles(NPs) for the highly sensitive and selective PEC detection of Hg 2+ , a model analyte with hypertoxicity to both human health and ecosystem. The probe Ru-1 was designed with Ru(II) bipyridyl complex as the chromophore, thiocyanate ligand as the recognition unit, and carboxylate group as the linkage site to connect Ru-1 to TiO 2 nanoparticles. Under irradiation, Ru-1 shows strong affinity to TiO 2 and good photophysical properties of strong visible light absorption, slow electron-hole(e-h + ) recombination, and fast photoelectron injection to TiO 2 nanoparticles via the π -bridge of 4-(2,2′-bipyridin)-4-yl-thiophene moiety. However, the specific coordination of Hg 2+ with Ru-1 via the thiol moiety in the thiocyanate enlarges the band gap of the complex and reduces the photocurrent significantly. The synergistic interaction between TiO 2 nanoparticles and the Ru-1 complex led to a selective PEC sensing strategy for Hg 2+ detection. Detectable linear ranges from 10 −12 g/mL to 10 −7 g/mL and from 10 −7 g/mL to 10 −3 g/mL were obtained without the interference from possibly co-existed metal ions. The good analytical performances indicate the chemical probe based biomolecule-free PEC platform may offer a new route for the detection of biologically and environmentally important small molecules.
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Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 126
·期 1
·463-476
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IF 1.515
Zhang Jiuxuan,Liu Yefei,Jiang Hong,Chen Rizhi
A highly efficient catalyst with the structure of semiconductor–metal heterojunction for phenol hydrogenation in water was fabricated by loading the Pd nanoparticles on the N-doped porous carbon-TiO 2 (CN-TiO 2 ) materials, which was synthesized via the one-step carbonization of TiO 2 -contained ZIF-67. The microstructures of the as-prepared Pd@CN-TiO 2 catalysts were investigated in detail and the catalytic properties were tested by the phenol hydrogenation under mild conditions. With increasing TiO 2 amount, the charge transfer and specific surface area of Pd@CN-TiO 2 initially increase and then reduce, thereby the catalytic performance show a similar regular pattern. The as-fabricated Pd@CN-TiO 2 exhibits a superior catalytic performance than the Pd nanoparticles supported on TiO 2 or CN separately, owing to their synergistic effect. When the parameters affecting the catalytic efficiency are optimized, the conversion of phenol and selectivity for cyclohexanone can even achieve 98% in pairs with a higher reaction rate of 0.45 mmol h −1 . Furthermore, the Pd@CN-TiO 2 shows stable performance in the recycling experiments.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yuqing Chen,Chun Shen,Jie Wang,Gang Xiao,Guangsheng Luo
As the energy shortage and environmental problem become the worldwide concern, the green synthesis of catalysts and their green applications have long been pursued. Here we proposed a facile catalyst synthesis approach in which Ag–TiO2 composites were prepared through an in situ reduction at room temperature without severe conditions or hydrogen atmosphere. Porous glass (PG) was chosen as the support, and the as-prepared Ag–TiO2/PG was equipped with the remarkable merits of intense visible light absorbance, effective separation of electron–hole pairs, high surface areas for adsorption, and abundant reactive sites for the photocatalytic oxidation. Conversions of 95.2% and 92.1% for dibenzothiophene (DBT) and benzothiophene (BT), respectively, were realized under irradiation of energy-saving visible light emitting diodes (LEDs), complying with the principles of “green chemistry”. Moreover, none of the external oxidants, such as H2O2 or O2, was introduced, greatly increasing the viability of industrial applications. Ag–TiO2/PG also showed remarkable activity for removing rhodamine B (RhB), methylene blue (MB), and methylene orange (MO) with the rate constants of 0.14, 0.18, and 0.055 min–1, respectively. The mechanism study revealed that the immobilized Ag acted as the role of “killing two birds with one stone”: enhancing the absorption of visible light, suppressing the recombination of photoinduced electron–hole pairs via trapping electrons, and contributing to the generation of •O2–. In addition, oxygen vacancies, •OH, and h+ also took part in the photocatalytic oxidation. This work explored the green synthesis of Ag–TiO2/PG and characterized their excellent photocatalytic activity for photocatalytic desulfurization and degradation of organic dyes, opening up new possibilities for low-energy-consumption photocatalysis and sustainable chemistry.
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Journal of Nanomaterials
·
2015
·
IF 1.644
Sufeng Wang,Fengjing Lv,Tifeng Jiao,Jingfen Ao,Xiaochun Zhang,Fengdan Jin
Artemia egg shells have an asymptotic sized pore structure (pore diameter: 500 nm–2500 nm), which could be used as a porous carrier for the preparation of nanocomposite materials. The objective of the present study was to prepare shell-supported TiO2 using a naturally porous carrier, Artemia egg shell, and to exhibit a case study of shell-supported TiO2 for formaldehyde removal. Characterization of shell-TiO2 using SEM-EDS, TEM, and XRD proved that Artemia shell with asymptotic reduction pores (pore diameter: 500 nm–2500 nm) can be used as the carrier for nanocomposite materials. Artemia egg shell-supported TiO2 in polycrystalline-like nanostructures can be used for the high efficiency removal (adsorption and degradation) of formaldehyde under visible light. Our results suggest that iron, one of the shell’s components, should broaden the absorption of visible light and enhance the photocatalytic efficiency of nanotitanium dioxide under visible light. Due to their interesting absorption and formaldehyde removal qualities, Artemia egg shell, as a novel naturally porous carrier for nanocomposite materials preparation, especially in the preparation of nanocatalysts, is worthy of further study.
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APPLIED PHYSICS LETTERS
·
2013
·Vol. 102
·期 14
·
IF 3.794
Wang Juangang,Shang Yunli
In the present work, we describe a practical technique to construct double-layer organized mesoporous TiO 2 films with a combined thickness of 0.85 μ m. Large mesopores (25.74 nm) formed in the film by using ovalbumin as the main template facilitate entry and adsorption of dye molecules. The films were sensitized by a dye that exhibits a high molar extinction coefficient because it contains a ligand with a fused-ring system. The double-layer films exhibited a solar conversion efficiency of 7.37%, which was about 35% higher than that of monolayer films.
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Journal of Environmental Sciences
·
2014
·
IF 1.922
Qingkong Chen,Fangying Ji,Qian Guo,Jianping Fan,Xuan Xu
A novel coupled system using Co–TiO 2 was successfully designed which combined two different heterogeneous advanced oxidation processes, sulfate radical based Fenton-like reaction (SR-Fenton) and visible light photocatalysis (Vis-Photo), for degradation of organic contaminants. The synergistic effect of SR-Fenton and Vis-Photo was observed through comparative tests of 50 mg/L Rhodamine B (RhB) degradation and TOC removal. The Rhodamine B degradation rate and TOC removal were 100% and 68.1% using the SR-Fenton/Vis-Photo combined process under ambient conditions, respectively. Moreover, based on XRD, XPS and UV-DRS characterization, it can be deduced that tricobalt tetroxide located on the surface of the catalyst is the SR-Fenton active site, and cobalt ion implanted in the TiO 2 lattice is the reason for the visible light photocatalytic activity of Co–TiO 2 . Finally, the effects of the calcination temperature and cobalt concentration on the synergistic performance were also investigated and a possible mechanism for the synergistic system was proposed. This coupled system exhibited excellent catalytic stability and reusability, and almost no dissolution of Co 2 + was found.
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