CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Qian Wang,Bohui Dong,Yingqiang Zhao,Fang Huang,Junfeng Xie,Guanwei Cui,Bo Tang
TiO 2 as an important photocatalyst, how to achieve its fast, controllable and green synthesis still remains a big challenge for the large-scale preparation and application. Deep eutectic solvents (DESs) are promising solvents in the green and mild preparation of high active nanomaterial due to their low cost, high green degree, low toxicity, easy large-scale preparation and similar properties with conventional ionic liquids. In this study, through the combined effect of both H-bond donor and H-bond acceptor, we have successfully used DES as solvent, template and inhibitor at the same time to fast synthesize new crassula peforata-like TiO 2 with (0 0 1) and (1 0 1) planes under mild reaction conditions (at 160 °C for only 4–8 h). The H 2 production rate by photocatalytic water splitting of this catalyst reaches up to 13.13 mmol·h −1 ·g −1 , which is 18-fold greater than that of commercial P25 TiO 2 and also much higher than those of other TiO 2 nanostructures. Such rate is the highest yield reported so far to the best of our knowledge for photocatalytic H 2 production catalyzed by sole TiO 2 . The higher activity is attributed to the special shape with surface heterojunctions and defects. This study will provide a new way for the green, fast, easy-controllable and batch preparation of new and high efficiency photocatalysts.
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Nanomaterials
·
2018
·Vol. 8
·期 11
·937
·
IF 3.504
Haiyan Yang,Liang Jiang,Yizhou Li,Guoqing Li,Yepeng Yang,Jiao He,Jiaqiang Wang,Zhiying Yan
In sharp contrast to conventional photosensitization methods in which the organic pigments were often adsorbed, herein we present a study on natural vegetable pigment inserted TiO2aerogel nanocomposites and we directly use red cabbage anthocyanin (RCP) as a structure-directing agent. It was found that pure TiO2aerogel nanocomposite did not exhibit any meaningful activity for photocatalytic reduction of Cr(VI). However, the photocatalytic reduction activity was greatly improved by the RCP inserted TiO2aerogel nanocomposites under visible-light irradiation, which was approximately 2- and 12.3-fold higher than that of TiO2aerogel conventionally photosensitized by RCP and pure TiO2aerogel nanocomposites, respectively. It also exhibited good stability and could be reused at least three times without losing a significant amount of its activity.Keywords:Red cabbage pigment;anthocyanin;TiO2aerogel;photocatalytic activity
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Nianbing Zhong,Ming Chen,Haixing Chang,Tianheng Zhang,Zhengkun Wang,Xin Xin
We present a high-selectivity photochemical fiber-optic sensor in which a plastic optical fiber (POF), TiO 2 -based composite, and polymer membrane are coupled for detection of phenol concentrations in water. A thinned POF is coated with TiO 2 -based composite, which is composed of Er 3+ :YAlO 3 /SiO 2 /TiO 2 (EYST) and acts as the sensing region. The EYST coating shows good light-inducing capacity at the core–coating interface and high photocatalytic activity in the visible light region. The polymer membrane is synthesized using PEBA2533 doped with β-cyclodextrin and shows high phenol selectivity and permeability; thus, phenol molecules can freely permeate the membrane and are then transferred, become attached to the surface of TiO 2 nanoparticles, and are photocatalytically degraded. Photocatalytic degradation of phenol improves the refractive index (RI) and absorbance of the solution because of the photocatalytic byproducts; consequently, the transmitted output light intensity of the sensor changes, and the phenol concentration is accurately detected by measuring the change in the light intensity. Experimental results indicate that the prepared device detects phenol in water with high selectivity and pH independence; in phenol detection, the novel sensor shows a sensitivity of −0.195 × 10 −3 (mg/L) −1 and a low limit of detection of 40 μg/L.
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Analytical Methods
·
2018
·Vol. 11
·期 2
·171-178
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IF 2.073
Renxuan Liu,Tao Sha,Bei Nie
In vivo analyzing chemical significance under human skin has impinged a formidable challenge upon regular optical methods due to its intrinsic opaque property. With analogy to a needle biopsy, conceptually and practically, here, we fabricated a “needle-like” nanopore-embellished TiO2 column through electrochemistry directed etching, intriguingly serving as hundreds of thousands of liquid containers, perpendicular to the needle axle. A silver nanostructure synthesized in situ within the nanotube array gives rise to an opportunity for enhanced Raman detection to profile the extracts with excellent sensitivity and considerable spatial resolution, delineating the molecular information in depth. This SERS-active needle, which combined the functions of liquid biopsy and optical detection can penetrate the upper skin layer with minimal invasion and obviation of the extra step for the mass-limited sample transferring, unraveling the chemical insights underneath the opaque materials.
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Journal of Environmental Sciences
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2018
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IF 3.12
Rong Cheng,Mi Kang,Zhi-peng Shen,Lei Shi,Xiang Zheng
Pathogenic viruses in drinking water are great threats to public health. Visible-light-driven photocatalysis is a promising technology for virus inactivation. However, the existing photocatalytic antiviral research studies have mostly been carried out in single-component systems, neglecting the effect of natural organic matter, which exists widely in actual water bodies. In this paper, electrospun Cu-TiO 2 nanofibers were prepared as photocatalysts, and their photocatalytic antiviral performance in the presence of humic acid (HA) was comprehensively studied for the first time. The properties of the reaction mixture were measured during the reaction. In addition, the safety, reliability and stability of photocatalytic disinfection in the mixed system were evaluated. The results showed that the virus removal efficiency decreased with the increase of the HA concentration. The type of reaction solution, such as PBS buffer solution or water, did not affect the removal efficiency noticeably. Under acidic conditions, the electrostatic forces between photocatalysts and viruses were strengthened, leading to higher virus removal efficiency. As the reaction time went on, the pH value in the solution increased first and then tended to be stable, the conductivity remained stable, and the dissolved oxygen increased first and then decreased. The safety test showed that the concentration of Cu ions released into the solution was lower than specified by the international standards. No photoreactivation was observed, and the addition of HA significantly reduced the reutilization efficiency of the photocatalysts.
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APPLIED CATALYSIS A-GENERAL
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2019
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IF 4.63
Li Cao,Xiaodong Wu,Ze Chen,Yue Ma,Ziran Ma,Rui Ran,Zhichun Si,Duan Weng,Baodong Wang
CeO 2 /WO 3 -TiO 2 (CeWTi) and Nb 2 O 5 -CeO 2 /WO 3 -TiO 2 (NbCeWTi) catalysts were prepared by a sol-gel precipitation method. Both the catalysts exhibit high selective catalytic reduction of NO x with NH 3 (NH 3 -SCR) activities at 270–500 °C. The sulfur tolerances of the catalysts were evaluated at 270 °C by adding H 2 O and SO 2 in the feeding gas and NbCeWTi exhibited a significantly improved resistance. The thermogravimetric (TG) and mass spectrographic (MS) results indicated that much less sulfates formed on NbCeWTi and existed mainly in the form of ammonium hydrogen sulfate species which protected Ce x+ active sites effectively from attacking of SO 2 . According to the results of temperature-programmed desorption of ammonia (NH 3 -TPD), H 2 temperature-programmed reduction (H 2 -TPR) and SO 2 oxidation , loading niobia on CeWTi inhibited the SO 2 oxidative adsorption and SO 3 production which basically reduced sulfur poisoning of the catalyst. Additionally, the niobia modification ensured the formation of nitrates from the competitive adsorption of SO 2 and hereby facilitated the nitrate SCR route based on the in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS).
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Halidan Maimaiti,Abuduheiremu Awati,Gunisakezi Yisilamu,Dedong Zhang,Shixin Wang
For decades, researchers have been looking for a high-efficiency, low-cost, and environment-friendly photocatalyst for CO 2 reduction. In this work, we employed SOCl 2 chlorination and EDA passivation to decorate the surface of nanocellulose crystals (NCC), and obtained aminated cellulose crystal NCC-EDA. Next, using coordination and dispersion of amino, hydroxyl, and other functional groups at the NCC-EDA surface, the TiO 2 nanoparticles synthesized in-situ from Ti(OBu) 4 were coated by NCC-EDA via a hydrothermal synthesis approach. Subsequently, the composite photocatalyst TiO 2 /NCC-EDA with various NCC-EDA contents was fabricated. The structure, optical properties, and photocatalytic CO 2 reduction performance of the photocatalyst were measured. The results suggest that the NCC-EDA based composite catalyst has highly efficient electron-hole separation and electron transfer as well as excellent CO 2 adsorption ability. The TiO 2 /NCC-EDA exhibits outstanding photocatalytic CO 2 to HCOOCH 3 conversion performance. At reaction time of 6 h, the HCOOCH 3 yield is 372.85 µmol/g cat, which is 4.5 times the yield of pure TiO 2 photocatalyst.
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Nanomaterials
·
2018
·Vol. 8
·期 12
·983
·
IF 3.504
Shiman He,Yuying Meng,Yangfei Cao,Senchuan Huang,Jingling Yang,Shengfu Tong,Mingmei Wu
TiO2is one of the most attractive semiconductors for use as a photoanode for photoelectrochemical (PEC) water oxidation. However, the large-scale application of TiO2photoanodes is restricted due to a short hole diffusion length and low electron mobility, which can be addressed by metal doping and surface decorating. In this paper we report the successful synthesis of hierarchical Ta doped TiO2nanorod arrays, with nanoparticles on the top (Ta:TiO2), on F-doped tin oxide (FTO) glass by a hydrothermal method, and its application as photoanodes for photoelectrochemical water oxidation. It has been found that the incorporation of Ta5+in the TiO2lattice can decrease the diameter of surface TiO2nanoparticles. Ta:TiO2-140, obtained with a moderate Ta concentration, yields a photocurrent of ∼1.36 mA cm−2at 1.23 V vs. a reversible hydrogen electrode (RHE) under FTO side illumination. The large photocurrent is attributed to the large interface area of the surface TiO2nanoparticles and the good electron conductivity due to Ta doping. Besides, the electron trap-free model illustrates that Ta:TiO2affords higher transport speed and lower electron resistance when under FTO side illumination.Keywords:hierarchical TiO2;Ta doping;charge separation;photoelectrochemical water oxidation
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Nano Energy
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2018
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IF 13.12
Chao Peng,Ping Wei,Xiaoyao Li,Yunpeng Liu,Yonghai Cao,Hongjuan Wang,Hao Yu,Feng Peng,Liyun Zhang,Bingsen Zhang,Kangle Lv
It is of prime importance to harness the transfer and flow of photogenerated electrons and holes to elongate the lifetimes of charge carriers and enhance the activity of semiconductor photocatalyst , which can be achieved by hybridizing the photocatalyst with appropriate cocatalysts with right electronic properties and placement. Herein, MXenes, a young family of two-dimensional transition metal carbides , are exploited as a hole mediator to enhance the photocatalytic activity of TiO 2 . We grow TiO 2 sheets exposing (001) surfaces on layered Ti 3 C 2 T x , and then photodeposited Cu 2 O nanodots on TiO 2 . We experimentally prove that the Ti 3 C 2 T x MXene from the wet HF etching method behaves as a low work function material ( ϕ = 3.4 eV). Thanks to this unique electronic property, the photogenerated electrons on TiO 2 hybridized with Ti 3 C 2 T x accumulate and tunnel to Cu 2 O to reduce it to elemental Cu as a reduction cocatalyst. The resulting Cu/TiO 2 @Ti 3 C 2 T x photocatalyst efficiently split water to produce hydrogen at 860 μmol g −1 h −1 . The results presented here demonstrate the promise of MXene materials in photocatalytic solar energy utilization. The insight into the electronic property of MXene sheds light on the new approach to the rational design of high-efficiency photocatalysts composed of MXenes.
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ADVANCED POWDER TECHNOLOGY
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2018
·
IF 2.943
Yi-Yi Liu,Xin-Yu Ye,Qing-Qing An,Bing-Xin Lei,Wei Sun,Zhen-Fan Sun
The bottom-straight and top-bent dual anatase TiO 2 nanowires directly on flurine-doped tin oxide (FTO) glass substrate are successfully synthesized for the first time via a two-step solvothermal reaction, which obtains single anatase TiO 2 nanowires with the diameter of 250–450 nm and the length of ∼49 μm in the first growth step, and the slender TiO 2 nanowires with the diameter of 40–80 nm intertwining larger nanowires to form dual nanowires network in the secondary growth step. Dye-sensitized solar cell (DSSC) based on dual TiO 2 nanowires exhibits the power conversion efficiency of 5.30%, which is much higher than those of DSSCs based on the pristine single TiO 2 nanwires (2.36%) due to the twining network like dual nanowires structure maintaining excellent electron transport and simultaneously enhancing the specific surface area and light scattering ability. Moreover, by TiO 2 sol treatment, the performance of dual TiO 2 nanowires based DSSC can be further enhanced, reaching an impressive power conversion efficiency (PCE) of 7.65%.
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CHINESE JOURNAL OF CATALYSIS
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2018
·
IF 3.525
Qi-Feng Liu,Qian Zhang,Bing-Rui Liu,Shiyou Li,Jing-Jun Ma
Inefficient charge separation and limited light absorption are two critical issues associated with high-efficiency photocatalytic H 2 production using TiO 2 . Surface defects within a certain concentration range in photocatalyst materials are beneficial for photocatalytic activity. In this study, surface defects (oxygen vacancies and metal cation replacement defects) were induced with a facile and effective approach by surface doping with low-cost transition metals (Co, Ni, Cu, and Mn) on ultrafine TiO 2 . The obtained surface-defective TiO 2 exhibited a 3–4-fold improved activity compared to that of the original ultrafine TiO 2. In addition, a H 2 production rate of 3.4 μmol/h was obtained using visible light ( λ > 420 nm) irradiation. The apparent quantum yield (AQY) at 365 nm reached 36.9% over TiO 2 -Cu, significantly more than the commercial P25 TiO 2 . The enhancement of photocatalytic H 2 production activity can be attributed to improved rapid charge separation efficiency and expanded light absorption window. This hydrothermal treatment with transition metal was proven to be a very facile and effective method for obtaining surface defects.
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RSC Advances
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2015
·Vol. 5
·期 54
·43528-43536
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IF 3.84
Suhang Xun,Wenshuai Zhu,Dan Zheng,Hongping Li,Wei Jiang,Ming Zhang,Yuejiao Qin,Zhen Zhao,Huaming Li
High activity oxidation of sulfur compounds to sulfones in extraction coupled with catalytic oxidative desulfurization (ECODS) system catalyzed by supported ionic liquid [Bmim]FeCl4/Am TiO2 was reported. The catalysts were analyzed by thermogravimetric (TG) analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). It was found that [Bmim]FeCl4 and Am TiO2 had a synergistic effect on the desulfurization system. Effects of calcination temperature of the catalyst and various reaction conditions on the catalytic activity of desulfurization were investigated. Moreover, GC-MS analyses were employed to prove the process of the desulfurization. As a solid catalyst, the supported ionic liquid could be separated from the reaction easily. The recycling tests showed that the desulfurization efficiency remained 100% after reusing it for 25 times. Therefore, the ECODS system has excellent reusability and is promising for industrial applications for catalytic oxidative desulfurization.
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