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Jialiang Liang, Fuyang Liu, Mian Li, Wen Liu, Meiping Tong
Magnetic Fe3 O4 @BiOI@AgI (FBA) spheres were synthesized through a multi-step process. The fabricated photocatalysts were characterized by different techniques. To testify the visible light driven photocatalytic activity of FBA, Rhodamine B and Bisphenol A were chosen as model common and emerging organic contaminants, respectively. While, gram-negative strain Escherichia coli was selected as model waterborne bacteria. The results showed that under visible light irradiation, FBA contained strong photocatalytic degradation capacity towards both RhB and BPA...
March 10, 2018: Water Research
Yibo Yan, Jie Chen, Nan Li, Jingqi Tian, Kaixin Li, Jizhou Jiang, Jiyang Liu, Qinghua Tian, Peng Chen
Graphene quantum dot (GQD), which is the latest addition to the nanocarbon material family, promises a wide spectrum of applications. Herein, we demonstrate two different functionalization strategies to systematically tailor the bandgap structures of GQDs whereby making them snugly suitable for particular applications. Furthermore, the functionalized GQDs with a narrow bandgap and intramolecular Z-scheme structure are employed as the efficient photocatalysts for water splitting and carbon dioxide reduction under visible light...
March 16, 2018: ACS Nano
Yao Yin, Wei-Zhi Weng, Jian-Guo Sun, Bo Zhang
A visible-light-promoted phosphinylation of allylic alcohols with concomitant 1,2-aryl migration is described. This transformation proceeds smoothly under metal-free and mild conditions by using an inexpensive organic dye, eosin Y, as the photocatalyst, affording various β-aryl-γ-ketophosphine oxides in moderate to good yields. Mechanistic studies suggested that the 1,2-aryl migration proceeded through a radical (neophyl) rearrangement.
March 16, 2018: Organic & Biomolecular Chemistry
Wei Guan, Gaoge Sun, Lei Yin, Zhenghua Zhang, Shichao Tian
The oxidation of hypophosphite to phosphate is the key to recover the phosphorus resource from the hypophosphite wastewater. In the present work, Ti4 O7 /g-C3 N4 composites were synthesized at two different temperatures (100 and 160°C) and their performance on photocatalytic oxidation of hypophosphite under visible light irradiation and the corresponding mechanism were evaluated. A hydrolysis method using g-C3 N4 and Ti4 O7 was applied to synthesize the Ti4 O7 /g-C3 N4 composites with their hybrid structure and morphology confirmed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectra (XPS)...
2018: Frontiers in Chemistry
Mandeep Singh, Deshetti Jampaiah, Ahmad E Kandjani, Ylias M Sabri, Enrico Della Gaspera, Philipp Reineck, Martyna Judd, Julien Langley, Nicholas Cox, Joel van Embden, Edwin L H Mayes, Brant C Gibson, Suresh K Bhargava, Rajesh Ramanathan, Vipul Bansal
Oxygen vacancies in inorganic semiconductors play an important role in reducing electron-hole recombination, which may have important implications in photocatalysis. Cuprous oxide (Cu2O), a visible light active p-type semiconductor, is a promising photocatalyst. However, the synthesis of photostable Cu2O enriched with oxygen defects remains a challenge. We report a simple method for the gram-scale synthesis of highly photostable Cu2O nanoparticles by the hydrolysis of a Cu(i)-triethylamine [Cu(i)-TEA] complex at low temperature...
March 15, 2018: Nanoscale
Jiaqi Zhang, Zipeng Xing, Jiayi Cui, Zhenzi Li, Siyu Tan, Junwei Yin, Jinlong Zou, Qi Zhu, Wei Zhou
Herein, C,N co-doped porous TiO2 hollow sphere visible light photocatalysts were fabricated using biocompatible N-lauroyl-l-glutamic acid as a doped precursor and soft-template by a mild and facile self-assembly soft-template method, followed by calcination at 550 °C in air. The structure, morphology, and surface elemental composition were characterized in detail by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy...
March 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
A H Reshak
Comprehensive ab initio calculations from first- to second-principles methods are performed to investigate the suitability of non-centro-symmetric CdLa2 S4 and CdLa2 Se4 to be used as active photocatalysts under visible light illumination. The calculations reveal the direct band gap nature of both compounds with large absorption coefficients (104 -105 cm-1 ). The absorption edges of CdLa2 S4 and CdLa2 Se4 occur at λ = 579.3 nm and λ = 670.1 nm, and the optical band gaps are estimated to be 2.14 eV and 1.85 eV for CdLa2 S4 and CdLa2 Se4 , respectively...
March 15, 2018: Physical Chemistry Chemical Physics: PCCP
Kentaro Teramura, Tsunehiro Tanaka
Artificial photosynthesis has recently drawn an increasing amount of attention due to the fact that it allows for direct solar-to-chemical energy conversion. However, one of the basic steps of this process, namely the reduction of CO2 by H2 O to afford O2 and CO2 reduction products (CO2 RPs) such as HCOOH, CO, HCHO, CH3 OH, and CH4 , is very difficult to achieve. In contrast to the CO2 reduction in plants and homogenous systems, the reduction of CO2 to CO2 RPs over heterogeneous photocatalysts was challenged by the competing reduction of H+ to H2 ...
March 15, 2018: Physical Chemistry Chemical Physics: PCCP
Yu Zhang, Zhijian Peng, Shundong Guan, Xiuli Fu
The data presented in this article are related to a research article entitled 'Novel β-NiS film modified CdS nanoflowers heterostructure nanocomposite: extraordinarily highly efficient photocatalysts for hydrogen evolution' (Zhang et al., 2018) [1]. In this article, we report original data on the synthesis processes optimization of the proposed nanocomposite on the basis of their optimum photocatalytic performance together with the comparison on the results of literatures and comparative experiments. The composition, microstructure, morphology, photocatalytic hydrogen evolution and photocatalytic stability of the corresponding samples are included in this report...
February 2018: Data in Brief
Chhabilal Regmi, Bhupendra Joshi, Schindra K Ray, Gobinda Gyawali, Ramesh P Pandey
Several photocatalytic nanoparticles are synthesized and studied for potential application for the degradation of organic and biological wastes. Although these materials degrade organic compounds by advance oxidation process, the exact mechanisms of microbial decontamination remains partially known. Understanding the real mechanisms of these materials for microbial cell death and growth inhibition helps to fabricate more efficient semiconductor photocatalyst for large-scale decontamination of environmental wastewater or industries and hospitals/biomedical labs generating highly pathogenic bacteria and toxic molecules containing liquid waste by designing a reactor...
2018: Frontiers in Chemistry
Liping Zhang, Alexandre Goncalves, Baojiang Jiang, Mietek Jaroniec
Due to the scarcity of iodine as well as its threat to the environment if in excess, iodine as a waste needs to be captured. As compared with ion-exchange resins and silver-containing materials, which are two popular iodide adsorbents, bismuth-containing compounds show some important advantages such as high iodide capture capacity and fast kinetics. In this study, two bismuth-containing compounds, bismuth vanadate (BiVO4) and bismuth oxide (Bi2O3), have been comprehensively investigated for iodide immobilization...
March 14, 2018: ChemSusChem
Guangwei Geng, Zhongju Wang, Penglei Chen, Bo Guan, Changchun Yang, Minghua Liu
Porphyrin-based supramolecular nanoassemblies of a spherical morphology have been attracting broad interest owing to their wide application possibilities in numerous fields of paramount significance. Most of the existing assembly protocols, however, either suffer from the requirement of elaborately-designed yet tediously-synthesized ad hoc porphyrins, the use of surfactant templates, or accurate consideration of the experimental parameters etc. The initiation of a facile surfactant-free fabrication protocol performable under ambient conditions using commercial porphyrins as building blocks is strongly desired...
March 14, 2018: Physical Chemistry Chemical Physics: PCCP
Yuejin Li, Xili Shang, Changhai Li, Xiaoming Huang, Jingjing Zheng
Novel visible-light-induced UiO-66/BiOI photocatalysts with a p-n junction structure have been prepared for the first time through a facile hydrothermal method. The prepared photocatalysts were characterized using the powder X-ray diffraction, high resolution transmission electron microscopy, scanning electron microscopy, UV-visible diffuse reflectance spectra, and N2 adsorption-desorption (Brunauer-Emmett-Teller) techniques respectively. The photodegradation performances of UiO-66/BiOI photocatalysts were evaluated by photodegrading salicylic acid under visible-light irradiation...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Jingran Chen, Xingyu Yang, Chenyu Zhu, Xin Xie, Cuiping Lin, Yalei Zhao, Qishe Yan
Antibiotic ciprofloxacin is one of the commonly used broad spectrum fluoroquinolone human and veterinary drugs. Because of the overuse of human beings, the presence of ciprofloxacin has been detected in a variety of environmental matrices. To solve this problem, a facile, environmentally-friendly Ag3 PO4 /AgBr composite photocatalyst was synthesized by a simple precipitation method at room temperature in the presence of cetyltrimethyl ammonium bromide (CTAB). CTAB was served as surfactant and the source of bromide ions...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Zhongjie Zhang, Shuwen Shao, Jingjing Dang, Changyu Lu, Fang Qin, Weisheng Guan
The ZnWO4 /Ag3 PO4 nanocomposites synthesized by simple precipitation processes were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflectance spectra. The results indicated that the ZnWO4 nanorods dispersed well on the surface of Ag3 PO4 particles and ball-and-rod structure p-n heterojunctions were successfully fabricated. In subsequent degradation experiments of methyl orange (MO), ZnWO4 /Ag3 PO4 composites showed the highest photocatalytic activity compared to pure Ag3 PO4 and ZnWO4 , due to the presence of ZnWO4 /Ag3 PO4 heterojunctions, which could separate and transfer the electron-hole pairs generated by visible light and enhance the photocatalytic performance of the catalysts...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Dipti Prava Sahoo, Susanginee Nayak, K Hemalata Reddy, Satyabadi Martha, Kulamani Parida
Photocatalytic generation of H2 and O2 by water splitting remains a great challenge for clean and sustainable energy. Taking into the consideration promising heterojunction photocatalysts, analogous energy issues have been mitigated to a meaningful extent. Herein, we have architectured a highly efficient bifunctional heterojunction material, i.e., p-type Co(OH)2 platelets with an n-type ZnCr layered double hydroxide (LDH) by an ultrasonication method. Primarily, the Mott-Schottky measurements confirmed the n- and p-type semiconductive properties of LDH and CH material, respectively, with the construction of a p-n heterojunction...
March 12, 2018: Inorganic Chemistry
Ashish Kumar, Christian Schuerings, Suneel Kumar, Ajay Kumar, Venkata Krishnan
A novel graphitic carbon nitride (g-C3 N4 )-CaTiO3 (CTCN) organic-inorganic heterojunction photocatalyst was synthesized by a facile mixing method, resulting in the deposition of CaTiO3 (CT) nanoflakes onto the surface of g-C3 N4 nanosheets. The photocatalytic activity of the as-synthesized heterojunction (along with the controls) was evaluated by studying the degradation of an aqueous solution of rhodamine B (RhB) under UV, visible and natural sunlight irradiation. The CTCN heterojunction with 1:1 ratio of g-C3 N4 /CT showed the highest photocatalytic activity under sunlight irradiation and was also demonstrated to be effective for the degradation of a colorless, non-photosensitizing pollutant, bisphenol A (BPA)...
2018: Beilstein Journal of Nanotechnology
Kah Hon Leong, Azrina Abd Aziz, Lan Ching Sim, Pichiah Saravanan, Min Jang, Detlef Bahnemann
The utilisation of sunlight as an abundant and renewable resource has motivated the development of sustainable photocatalysts that can collectively harvest visible light. However, the bottleneck in utilising the low energy photons has led to the discovery of plasmonic photocatalysts. The presence of noble metal on the plasmonic photocatalyst enables the harvesting of visible light through the unique characteristic features of the noble metal nanomaterials. Moreover, the formation of interfaces between noble metal particles and semiconductor materials further results in the formation of a Schottky junction...
2018: Beilstein Journal of Nanotechnology
Deivisson Lopes Cunha, Alexei Kuznetsov, Carlos Alberto Achete, Antonio Eduardo da Hora Machado, Marcia Marques
Heterogeneous photocatalysis using titanium dioxide as catalyst is an attractive advanced oxidation process due to its high chemical stability, good performance and low cost. When immobilized in a supporting material, additional benefits are achieved in the treatment. The purpose of this study was to develop a simple protocol for impregnation of TiO2 -P25 on borosilicate glass spheres and evaluate its efficiency in the photocatalytic degradation using an oxidizable substrate (methylene blue), in a Compound Parabolic Concentrator (CPC) reactor...
2018: PeerJ
Chengjie Song, Mingshan Fan, Weidong Shi, Wei Wang
We have successfully synthesized the composites of two-phase g-C3 N4 heterojunction photocatalysts by one-step method. And the reduced graphene oxide/two-phase g-C3 N4 heterojunction photocatalyst was fabricated via a facile hydrothermal reduction method. The characterization results indicated that the two-phase g-C3 N4 was integrated closely, and the common phenomenon of agglomeration for g-C3 N4 was significantly reduced. Moreover, the oxidized graphene was reduced successfully in the composites and the graphene was overlaid on the surface or the interlayers of g-C3 N4 heterojunction composite uniformly...
March 10, 2018: Environmental Science and Pollution Research International
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