检索结果-南通市图书馆

Journal of Materiomics 2019年第3期5卷 446-454页

作者： Dasari Ayodhya Guttena Veerabhadram Department of Chemistry University College of ScienceOsmania UniversityHyderabad500007Telangana StateIndia

We report the simple synthesis of zinc sulfide nanoparticles(ZnS NPs)by a co-precipitation method using Schiff base,(2-[(4-methoxy-phenylimino)-methyl]-4-nitrophenol)as a capping *** formation of ZnS NPs and their optical,structural,thermal properties and morphologies were studied by means of UVevis DRS,PL,FTIR,XRD,SEM,TEM,and *** optical properties and quantum confinement effect of the products were confirmed by means of spectroscopic *** have accessed the photocatalytic ability of the prepared ZnS and Schiff base capped ZnS NPs in the degradation of chlorpyrifos under UV light irradiation for the prevention of environmental *** prepared ZnS NPs exhibited a selective probe detection of Fe^(3+),Cr^(2+) and Cd^(2+) ions by fluorometrically and the emission band which disappears in the presence of increasing concentrations of Fe^(3+),Cr^(2+) and Cd^(2+) *** work suggested that the synthesized Schiff base capped ZnS NPs could be a potential selective photocatalyst for the degradation of toxic pollutants and a selective probe sensor for the detection of heavy metal ions.

关键词： Schiff base ZnS nanoparticles Chlorpyrifos pesticide heterogeneous photocatalysis Fluorescence sensor

Semi-heterogeneous photo-Cu-dual-catalytic cross-coupling reactions using polymeric carbon nitrides

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2022年第1期67卷 71-78,M0004页

作者： Zhaofei Zhang Yangsen Xu Qitao Zhang Shaofan Fang Hongli Sun Wei Ou Chenliang Su International Collaborative Laboratory of 2D Materials for Optoelectronic Science&Technology of Ministry of Education Engineering Technology Research Center for 2D Materials Information Functional Devices and Systems of Guangdong ProvinceInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

A merger of copper catalysis and semiconductor photocatalysis using polymeric carbon nitride(PCN)for multi-type cross-coupling reactions was *** dual-catalytic system enables mild C-H arylation,chalcogenation,and C-N cross-coupling reactions under visible light irradiation with a broad substrate ***-to-excellent yields were obtained with appreciable site selectivity and functional group ***-free and low-cost PCN photocatalyst can easily be recovered and reused several times.

关键词： Dual catalysis Polymeric carbon nitride heterogeneous photocatalysis C-H functionalization C-N coupling

Photo-induced surface frustrated Lewis pairs for promoted photocatalytic decomposition of perfluorooctanoic acid

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第1期17卷 27-32页

作者： Xianjun Tan Zhenying Jiang Yuxiong Huang Tsinghua-Berkeley Shenzhen Institute(TBSI) Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

heterogeneous photocatalysis has gained substantial research interest in treating per-and polyfluoroalkyl substances(PFAS)-contaminated ***,sluggish degradation kinetics and low defluorination efficiency compromise their practical ***,we report a superior photocatalyst,defected Bi_(3)O(OH)(PO_(4))_(2),which could effectively degrade typical PFAS,perfluorooctanoic acid(PFOA),with high defluorination *** UV light irradiation could in situ generate oxygen vacancies on Bi_(3)O(OH)(PO_(4))_(2) through oxidation of the lattice hydroxyls,which further promotes the formation of Lewis acidic coordinately unsaturated bismuth ***,the Lewis acidic sites couple with the proximal surface hydroxyls to constitute the surface frustrated Lewis pairs(SFLPs).With the in-depth spectroscopic analysis,we revealed that the photo-induced SFLPs act as collection centers to effectively adsorb PFOA and endow accessible pathways to transfer photogenerated holes to PFOA ***,activation of the terminal carboxyl,a ratelimiting step for PFOA decomposition,could be easily achieved over the defected Bi_(3)O(OH)(PO_(4))_(2) *** results suggest that SFLPs exhibit great potential in developing highly efficient photocatalysts to degrade persistent organic pollutants.

关键词： heterogeneous photocatalysis Surface frustrated Lewis pairs Perfluorooctanoic acid Defluorination efficiency Environmental remediation

Removal of the Methylene Blue Dye (MB) with Catalysts of Au-TiO<sub>2</sub>: Kinetic and Degradation Pathway

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modern Research in Catalysis 2021年第1期10卷 1-14页

作者： María-Cruz Arias Claudia Aguilar Mohamad Piza Elvira Zarazua Francisco Anguebes Francisco Anguebes Francisco Anguebes Francisco Anguebes Víctor Cordova Faculty of Chemistry Autonomous University of Carmen City of Carmen Mexico Department of Ecomaterials and Energy Autonomous University of Nuevo León San Nicolás de los Garza México

Au-TiO2 catalysts were used in the photocatalytic degradation of the methylene blue dye (MB). The synthesis of titanium oxide (TiO2) was carried out by sol-gel method. Subsequently, particles of Au were deposited on the surface of the semiconductor by photo-deposition, thus modifying the surface of the semiconductor. For the characterization of the catalyst obtained, the techniques of X-ray Diffraction (DRX), Scanning Electron Microscopy (SEM), Spectroscopy with Diffuse Reflectance (DR) and Surface Area by the BET (Brunauer, Emmett y Teller) were used. The solid obtained was tested experimentally as a catalyst in the photocatalytic degradation of a solution of MB. The data obtained were analyzed by UV-vis Spectroscopy and Total Organic Carbon (TOC) and the results indicated conversions were greater than 80%. The intermediate products were evaluated by mass coupled gas chromatography (GC-MS) and the MB decomposition route was by hydroxylation, obtaining aromatic intermediates, esters and products of the chemical degradation of the molecule.

关键词： Titanium Oxide Water Pollution Methylene Blue Dye heterogeneous photocatalysis

Solar photocatalysis of A Pesticide in A Tubular Reactor on Titaniferous Sand as A New Semi-Conductor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Chemical Engineering and Science 2023年第2期13卷 119-131页

作者： El Hadji Moussa Diop Kalidou Ba Mamadou Faye Alpha Ousmane Toure Falilou Mbacké Sambe Water Energy Environment and Industrial Processes Laboratory (LE3PI) Higher Polytechnic/Cheikh Anta Diop University Dakar Senegal School of Industrial and Biological Engineering Dakar Senegal

This present study comes in addition to overcome the problems of separation of fine particles of TiO2 in heterogeneous photocatalysis after treatment. It aims to show the potential for using titaniferous sand as a new semiconductor under solar irradiation. The photocatalytic efficiency of this titaniferous sand was tested on a pesticide (Azadirachtin). A tubular photocatalytic reactor with recirculation of the polluting solution was designed for the elimination of the pesticide in an aqueous solution. Before its use as a photocatalyst, the titaniferous sand has undergone a specific treatment that consists of calcination at 600℃ followed by extraction of the calcined natural organic materials, which can interfere with the measurement of analytical parameters such as COD. The titaniferous sand was also characterized by X-ray fluorescence spectroscopy (XRF). XRF analyses have shown that TiO2 is predominant in the titaniferous sand with a percentage that has been estimated at 46.34%. The influence of various experimental parameters such as the flow rate of the polluting solution, the concentration of titaniferous sand, the presence of oxygen and the intensity of the overall rate of sunshine, was studied to optimize the photocatalytic degradation of the pesticide. The results showed that the highest removal rate (70%) was observed under the following conditions: a pH of 6, a titaniferous sand concentration of 150 g/L, a flow rate of 0.3 mL/min, and a sunshine rate of 354 W/m2 and in the presence of atmospheric oxygen. Under these experimental conditions, the rate of photodegradation of the pesticide follows the pseudo first order kinetic model of Langmuir Hinshelwood with a coefficient of determination R2 of 0.9869 and an apparent rate constant of 0.0029 min-1. The results clearly demonstrated the potential of titaniferous sand as a photocatalyst sensitive to sunlight for the effective removal of pesticides in the aq

关键词： Solar Energy heterogeneous photocatalysis Sand Titaniferous Titanium Dioxide Pesticide

Evaluation of TiO_(2),ZnO,CuO and Ga_(2)O_(3)on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Physical Chemistry 2012年第3期2卷 135-140页

作者： Flavia Cristina Sertori Paschoalino Matheus Paes Paschoalino Elizabete Jordão Wilson de Figueiredo Jardim Department of Chemical Systems Engineering Laboratory of Catalytic Processes Development(LDPC)Faculty of Chemical EngeneeringUNICAMP-University of CampinasCampinasBrazil Department of Analytical Chemistry Institute UNICAMP-University of CampinasCampinasBrazil

Even with rigorous environmental regulations, phenol still is a major contaminant. One possible solution is the use of heterogeneous photocatalysis due to low chemical addition, feasibility and reliability to be implanted on cost-effective industrial process. TiO2 is the most employed photocatalyst because of its favorable (photo) chemical properties and ZnO is considered one of the best alternative for that. Other oxides were tested in lesser proportions, like CuO and Ga2O3. When the photocatalyst is dispersed as slurry, higher degradation rates are achieved due to high solid to liquid contact area when compared with supported form. The aim of this work was to develop a batch recirculating photocatalytic reactor and evaluate its efficiency when assisted by the photocatalysts TiO2 P25, ZnO, CuO and β-Ga2O3. TiO2 achieved 95% mineralization after 200 min reaction in an average degradation rate of 0.68 mg·L﹣1·min﹣1 and ZnO was less efficient (0.41 mg·L﹣1·min﹣1). Ga2O3 and CuO presented poor performance, mainly due to low surface area for the CuO syntesized and the absorption of the UV radiation by the reactor walls, decreasing Ga2O3 activity. Degradation intermediates were detected in diverse concentrations and at different operational times for each oxide tested, which indicate different degradation mechanisms.

关键词： Phenol TiO_(2) ZnO CuO Ga_(2)O_(3) heterogeneous photocatalysis

Development of a Construction Material for Indoor and Outdoor, Metakaolinite-Based Geopolymer, with Environmental Properties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

材料科学与工程（中英文A版） 2019年第4期9卷 131-142页

作者： M.Mondragón-Figueroa Héctor.R.Guzmán-Carrillo MiguelÁngel Rico JoséLuis.Reyez-Araiza Jorge.Pineda-Piñón Edgar J.López-Naranjo María C.Columba-Palomares Jóse.M.López-Romero Josè.Ramón Gasca-Tirado Alejandro.Manzano-Ramírez CINVESTAV-Querétaro Libramiento Norponiente#2000Fraccionamiento Real de JuriquillaQuerétaro 76230Qro.México Facultad de Química Universidad Autónoma de Querétaro centro de estudios Académicos sobre contaminación AmbientalQuerétaro 76010Qro.México DIPFI Facultad de IngenieríaUniversidad Autónoma de QuerétaroC.U.Cerro de las CampanasCentroQuerétaro 76010Qro.México Instituto Politécnico Nacional Centro de Investigación en Ciencia Aplicada y Tecnología AvanzadaUnidad QuerétaroCerro Blanco No.141Colinas del CimatarioQuerétaro76090Qro.México DIP-CUCEI Universidad de GuadalajaraJoséGuadalupe Zuno#48Los BelenesZapopan 45100Jal.México Facultad de Farmacia Universidad Autónoma del Estado de MorelosAv.Universidad#1001Cuernavaca 62209Mor.México Departamento de Ingeniería Universidad de GuanajuatoGuanajuato 36000México

Environmental problems that came from the human activity have many facets,since pollution of the atmosphere arises from vehicles,industrial emissions while pollution of water could be from organic compounds,pesticides *** can cause serious health effects,such as respiratory diseases,including asthma and lung ***,in the present work,a kinetic study on the effective adsorption and photo degradation of methylene blue(MB)dye,under ultraviolet A(UVA)irradiation of an alkali activated inorganic polymer(geopolymer)with homogeneously dispersed titanium dioxide(TiO2)micro-particles is *** addition,antimicrobial testing of the alkali activated TiO2 material was performed showing a bacteriostatic effect.

关键词： heterogeneous photocatalysis semiconductor alkali activated bacteriostatic effect