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   Decolourization of cationic and anionic dyes from aqueous solution by adsorption on NaOH treated eggshells: Batch and fixed bed column study using Response Surface Methodology  
   
نویسنده akazdam s. ,chafi m. ,yassine w. ,sebbahi l. ,gourich b. ,barka n.
منبع journal of materials and environmental science - 2017 - دوره : 8 - شماره : 3 - صفحه:784 -800
چکیده    In this study,we investigated the adsorption of methylene blue (mb) and acid orange 7 (ao7) dyes on a natural adsorbent,we have selected a food derivative product (eggshells) treated with naoh (tes) as a new and potential biosorbent. different models of adsorption isotherms in batch study were applied to fit experimental equilibrium data at different solution temperatures; langmuir and temkin model fitted the adsorption data quite reasonably (r2 > 0.98). results have showed that the adsorption of mb on tes dye followed very well the second order kinetic model. the thermodynamic parameters were evaluated; the negative values of δh° and δg° indicated respectively that the adsorption of mb onto tes was exothermic and spontaneous process. the continuous method was modeled by response surface methodology (rsm) . the effect of operating parameters such as flow rate,initial dye concentration,and bed height were exploited in this study. the precision of the equation obtained by box-behnken design (bbd) utility for modeling and optimization by response surface methodology rsm was confirmed by the analysis of variance (anova). the optimum conditions proposed by box-behnken design (bbd) to reach the maximum dye removal through adsorption process. under the optimum conditions,the removal efficiency ofao7 was 89.89%. in summary,the results have established good potentiality for the waste eggshell particles to be used as a sorbent for the removal of mb from wastewater in batch study and were shown to be suitable adsorbent for adsorption of ao7 using fixed-bed adsorption column. © 2017,university of mohammed premier oujda morocco.
کلیدواژه BBD; Beddepth; Biosorption; Dye; Fixed-bedcolumn; Isotherms; Kinetics; Modeling; Optimisation; Removal; RSM; TES; Thermodynamics; Wastewater
آدرس laboratory of engineering,processes and environment (lepe),high school of technology,university hassan ii of casablanca morocco, Morocco, laboratory of engineering,processes and environment (lepe),high school of technology,university hassan ii of casablanca morocco, Morocco, laboratory of engineering,processes and environment (lepe),high school of technology,university hassan ii of casablanca morocco, Morocco, laboratory of engineering,processes and environment (lepe),high school of technology,university hassan ii of casablanca morocco, Morocco, laboratory of engineering,processes and environment (lepe),high school of technology,university hassan ii of casablanca morocco, Morocco, university hassan 1,laboratoire des sciences des matériaux,des milieux et de la modélisation (ls3m),bp.145,khouribga, Morocco
 
     
   
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