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Carbon aerogels prepared by autocondensation of flavonoid tannin

Carbon Resources Conversion 2019年第1期2卷 72-84页

作者： A.Szczurek V.Fierro g.medjahdi A.Celzard Universitede Lorraine CNRSIJLF-88000 EpinalFrance LTNFM Centre of New TechnologiesUniversity of WarsawBanacha 2c02097 WarsawPoland Universitéde Lorraine CNRSIJLF-54000 NancyFrance

The first carbon aerogels prepared by autocondensation of condensed(flavonoid)tannin,a cheap renewable resource extracted from Mimosa barks,are *** aqueous solutions of tannin and sodium silicate indeed produced the very fast gelation of tannins,thus leading to organic hydrogels which were first converted into organic aerogels by supercritical drying,and then into carbon aerogels after pyrolysis at 900℃.Subsequent dissolution of the silica nanoparticles thus formed within the carbon structure further increased significantly the porosity of the *** thus appeared to be both the gelation catalyst and a pore-directing *** this work,the influence on the porosity of the silica/tannin ratio and of the nature of the etching agent used for removing the silica was thoroughly investigated by combining several *** conditions for producing either the most porous materials or those with the highest surface areas were identified and discussed.

关键词： Condensed tannins Autocondensation reactions Mesoporous carbons Carbon aerogels

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Cadmium sulfide thin films growth by chemical bath deposition

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Journal of Semiconductors 2018年第3期39卷 50-56页

作者： S.Hariech M.S.Aida J.Bougdira M.Belmahi g.medjahdi D.genève N.Attaf H.Rinnert Thin films and Interfaces Laboratory Faculty of Sciences Mentouri University Department of physics Faculty of science King Abdulaziz University Jean Lamour Institute University of Lorraine

Cadmium sulfide（Cd S） thin films have been prepared by a simple technique such as chemical bath deposition（CBD）. A set of samples Cd S were deposited on glass substrates by varying the bath temperature from 55 to 75 °C at fixed deposition time（25 min） in order to investigate the effect of deposition temperature on Cd S films physical properties. The determination of growth activation energy suggests that at low temperature Cd S film growth is governed by the release of Cd^（2＋） ions in the solution. The structural characterization indicated that the Cd S films structure is cubic or hexagonal with preferential orientation along the direction（111） or（002）, respectively. The optical characterization indicated that the films have a fairly high transparency, which varies between55% and 80% in the visible range of the optical spectrum, the refractive index varies from 1.85 to 2.5 and the optical gap value of which can reach 2.2 e V. It can be suggested that these properties make these films perfectly suitable for their use as window film in thin films based solar cells.

关键词： thin films chemical bath cadmium sulfide solar cell

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The Use of Aloe vera as Natural Coagulant in Algerian Drinking Water Treatment Plant

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Journal of Renewable Materials 2022年第3期10卷 625-637页

作者： Abderrezzaq Benalia Kerroum Derbal Amel Khalfaoui Antonio Pizzi ghouti medjahdi Faculty Process Engineering University of Constantine 3Constantine25000Algeria National Polytechnic School of Constantine Constantine25000Algeria LERMAB-ENSTIB University of LorraineEpinal88000France Institut Jean Lamour Universitéde LorraineCNRSNancy54011France

The purpose of this work is the study the ability of the plant material Aloe vera to act as natural coagulant using raw water obtained from a drinking water treatment plant(Mila,Algeria).Different solvents such as:NaCl;NaOH and HCl were used as chemical activators to extract the active components from the Aloe vera plant,and different coagulation-flocculation experiments were conducted in a jar test apparatus to evaluate the perfor-mance of the extracted ***,the effect of coagulant dose on some water parameters such as turbidity,pH,total alkalinity and organic matter were *** results showed that the use of coagulants obtained by using different solvents increases the coagulation efficiency compared to the coagulant obtained from the raw material,for example the maximum turbidity removal efficiency was 28.23,78.07,83.46 and 85.15%when using powdered Aloe vera(raw material),AV-NaCl(0.5 M),AV-NaOH(0.05 M)and AV-HCl(0.05 M),*** results defined,that the residual turbidity obtained in this work,where the Aloe vera was used(after treat-ment by solvents)produced a turbidity lower than the Algerian standard(5 NTU)with initial turbidity(13 NTU).In this study,the infrared spectrum study and analysis has revealed the presence of different functional groups,which are responsible for the coagulation process.

关键词： Actives components coagulant colloidal particles infrared spectrum solvent

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