The present study was carried out to investigate the potential of hardened paste of Portland cement (HPPC) as a low-cost adsorbent for the removal of Basic Red 46 (BR 46) from contaminated water by using batch adsorption studies. In this work, HPPC has been selected as adsorbent because of the main advantages such as high efficiency, simple separation of sludge, abundant availability and low-cost material. The removal of dye in aqueous medium through the process of adsorption with HPPC under a set of variables (contact time, adsorbent dosage, pH, temperature and adsorbent particles size) has been investigated. Results showed that removal of BR 46 increased over 80% with increasing adsorbent dosage, temperature, contact time, pH and adsorbent particle size decreasing.Also the equilibrium adsorption data were fitted well for Temkin isotherm. The adsorption of BR 46 was endothermic and spontaneous with âˆ†Hâ—¦ values of +5.452 kJ mol−1 and âˆ†Sâ—¦ values of 0.035 JK-1 mol-1. The free energy changes âˆ†Gâ—¦ was evaluated with temperature increasing. From the experimental results, it may be concluded that HPPC was an efficient and economical adsorbent for BR 46 removal.
Key words: Adsorption, Basic Red 46 removal, hardened paste of Portland cement, kinetics, equilibrium isotherm, thermodynamic.
HPPC, Hardened paste of Portland cement; SEM, scanning electron microscopy; COD, chemical oxygen demand.
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