Algerian journal of chimical engineering

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Browsing Algerian journal of chimical engineering by Subject "Adsorption"

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    Cationic dyes removal from wastewater by adsorptive method: A systematic in-depth review
    (University of Eloued جامعة الوادي, 2021-07-04) Yunusa,Umar. Usman ,Bishir . Ibrahim , Muhammad Bashir
    One of the most pressing environmental problems is the existence of synthetic dyes in industrial wastewaters. The presence of dyes in wastewater can cause severe problems to human beings and aquatic life, and that warrants removal from aqueous medium. Amongst the multiple strategies to treat dye-contaminated water, adsorption is considered superior because of low cost, flexibility, ease of operation and lower energy consumption. Many adsorbents, including carbon-based materials, biomaterials, nanomaterials, Schiff bases, metal-organic frameworks as well as natural and synthetic polymers, have been successfully applied in cationic dyes remediation. The current review article provides literature information about cationic dyes, various treatment strategies, principles of adsorption and recent trends in adsorbents application were discussed at length. The applicability of various isotherms and kinetic models for cationic dyes removal by diversified adsorbents is also highlighted here. Conclusions have been drawn from the literature reviewed and recommendations for future research perspectives are proposed
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    Non-destructive multielement analysis of airborne particles byinstrumental neutron activation analysis
    (University of Eloued جامعة الوادي, 2022-12-31) Sani Musa - AbdullahiMuhammad Ayuba
    Adsorption of anionic dye Alizarin red S (ARS) on carbonized typha grass (CRB-TG) was studied in an equilibrium batch process. Effects of contact time, initial dye concentration, adsorbent dose, pH, and temperature on the ARS removal were tested. The adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and point of zero charge (PZC) methods. Equilibrium data were mathematically modelled using the Langmuir, Freundlich, Temkin and Dubinin Radushkevich (D-R) models. Kinetic of adsorption was determined by pseudo first-order, pseudo-second-order Elovich and Intraparticle diffusion models. The thermodynamics quantities of the adsorption process including ΔS (56.983J/molK), ΔH (10.909kJ/mol) and ΔG (-6.359 to -7.499kJ/mol) were calculated from Van’t Hoff plot. An optimum equilibrium removal of the anionic dye was obtained at a pH of 6, contact time of 60 minutes, low adsorbent dosage and moderate temperature. The rapid ARS adsorption verified the efficiency of CRB-TG with a maximum adsorption capacity of 46.296mg/g. The data generated were best described by pseudo-second-order kinetic model and the adsorption isotherm was favoured by Freundlich compared to other models tested. The thermodynamics parameters indicate the process to be rapid, feasible and spontaneous. The obtained results show that carbonized typha grass can be used as a readily available, low cost, eco-friendly adsorbent for the removal of anionic dyes from waste water with improved efficacy as an outstanding alternative to the commercially available adsorbents
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    Recovery of Cationic Dyes Bearing Wastewater Using Shea Butter Leaves: Kinetic Adsorption, Desorption and Reusability Studies
    (University of Eloued جامعة الوادي, 2023-06-18) Shehu, M-B Ayuba, B
    The present study explains the preparation and application of Vitellaria paradoxa Activated Carbon (VPAC) as a new low-cost adsorbent in the removal of methylene blue and rhodamine B dye from its aqueous solution. SEM showed surface morphology, EDX disclosed elemental composition while pHpzc determines the pH at which the adsorbent surface has net electrical neutrality. The effects of operating parameters such as contact time, adsorbent dose, initial dye concentration, pH, temperature and competition were investigated for the removal of methylene blue and rhodamine B dyes using VPAC. VPAC was maximum at pH of 6 contact time of 60min and pH of 7 contact of time 80min respectively. The adsorption kinetic results showed that the pseudo-second order model was more suitable to explain the adsorption of methylene blue and rhodamine Bdye onto VPAC, because the calculated and experimental are in agreement. In VPAC, Qexp = 49.092mg/g, Qcal = 49.505mg/g and R2= 0.999 for methylene blue while Qexp = 49.508mg/g, Qcal = 49.011mg/g and R= 0.999 for rhodamine B. The adsorption mechanism results showed that the adsorption process was controlled by both the internal and external diffusion of methylene blue and rhodamine B dye molecules. Desorption studies for reusability revealed that HCl offered the best recovery.