Mesoporous silica synthesised by a local kaolin as efficient adsorbent for the real effluent textile treatment

International audienceIn 1992, Mobil company synthesized and characterized the first mesopoous material [1]. Since then, these materials have attracted the interest of many researchers. This interest is justified by their particular properties such as a regular arrangement of the channels, a modulable pore size of 2 to 30 nm greater than zeolites, and a high specific surface area greater than 1000 m 2 .g-1. Physicochemicals propreties allow to use them in various and varied fields such as catalysis, separation, chromatography, biochemistry and adsorption. In our work the mesoporous silica synthesised by local raw clay is a new nanostructured material for environmental textile effluent treatment applications. The DD3 (Djebel Debagh) Kaolin comes from the municipality of Guelma in Algeria and it has been chemically and thermally treated. In addition, the pluronic L35 (EO11PO16EO11) has been used as a structuring agent. X-ray diffraction, X-ray fluorescence, transmission electron microscopy, and nitrogen adsorption-desorption were used to evaluate the textural and structural properties and composition of the synthesized material. The synthesized material gives a surface area of 161 m² / g which is superior to (92 m² / g) the surface area of nanostructured materials in the literature [2]. Its adsorption properties have been tested on textile industry effluents and indicate a good efficiency of treatment by a reduction of most parameters (BOD, COD, etc ...). This suggests that this new mesoporous material synthesised by clay available and inexpensive could have applications in the environmental field. [1] Guisnet , M.,et al., (2006) Les zéolithes, Un nanomonde au service de la catalyse, EDP Sciences. [2] Auta, M.,et al., (2012) Chem. Eng. J. 198-19:219-227. Preferred format: Oral Session number and name: D. Functionalized clays, health and cosmetics D1 Recent progress on nanotechnology and nanomaterials from clay minerals

Synthesis and application of Algerian natural kaolins modified 13X zeolite for the treatment of real textile effluent

International audienceIn this study, 13X zeolite was successfully synthesized from natural local kaolins DD1, DD2 and DD3 via alkali fusion followed by hydrothermal treatment. Fusion with NaOH, followed by hydrothermal reaction, kaolinite and halloysite in kaolin sample were converted inton 13X zeolite. The Three kaolins DD1, DD2 and DD3 issued zeolite 13X were characterized using X-ray diffraction (XRD) and scanning electronic microscopy (MEB). The adsorption experiments were done using the real textile effluent. The results show that the adsorption is efficient and feasible at ambient temperature on DD1 kaolin issued 13X compared to 13X zeolite synthesised by DD2 and DD3 with good discolouration efficiency. Experiments with real textile wastewater showed an improvement of physico-chemical characteristics (COD, MIS,PO 4 3-, NO 2-) compared to the untreated effluent

Investigation of adsorption properties of modified DD kaolins to microporous material type 13X zeolite in treatment of textile industry effluent: experiments and theoretical approach

International audienceThe textile industry has experienced a great development accompanied by a large production of polluted water released into the environment, which requires a treatment that varies according to the nature of the pollutants. The work carried out aims at testing 13X type zeolites synthesized from Djebel Debagh DD1, DD2, and DD3 kaolins in order to remove dyes and other pollutants from the effluent of the COTITEX textile industry (Batna, Algeria). Several experimental parameters were studied (pH, temperature, initial concentration, mass of adsorbent) and physicochemical characterizations were done on the synthesized adsorbents and the effluent to be treated. The zeolites 13X synthesized from DD1, DD2, and DD3 kaolins were characterized using X-ray diffraction (XRD), Fourier transforms infrared (FTIR), and scanning electron microscopy (SEM). The adsorption experiments were done using the anionic dye present in the effluent and using real textile effluent. The results show that the dye adsorption is efficient and feasible at ambient temperature on the 13X type zeolite synthesized from DD1 kaolin compared to 13X zeolites synthesizedfromDD2 and DD3, with a good discoloration efficiency. Experiments with real textile wastewater showed a significant improvement in the physicochemical characteristics (COD, DBO5, TSS, PO4 3-, and NO2-) compared to the untreated effluent

Mesoporous silica synthesised from natural local kaolinas an effective adsorbant for removing of acid Red 337 and its application in the treatment ofreal industrial textile effluents

International audienceThis paper presents a synthesis of mesoporous silica (MS) from natural clay as silica sourceusing L35 pluronic(EO11PO16EO11) as structure directing agent. The prepared material wascharacterised by XRD, FRX, TGA, SEM, MET and N2 adsorption-desorption analyses. Then,mesoporous material was used for the removal of Acid Red 337 (AR337) from aqueous solution, and the treatment of real textile effluent. The effect of pH, contact time, weight of adsorbent and initial concentration wasstudied in batch adsorption. The synthesizedmesoporous material showed good discolouration efficiency with a 62% percentage. Experiment with real textile wastewater showed that 39%, 40% and 31.2% of thecolor, TOC and CODrespectively were eliminated byusing 1g of MS per litre of wastewater