Recalcitran Cibacron Red Dye Adsorption by Locally Sourced Dolomite Adsorbent

Abstract

Restorative step towards serene environment collapse was attempted by harnessing potentials of locally available dolomite material from Perak state in Malaysia. The dolomite material was of synthetic textile waste-waters containing reactive Cibacron Red dye (CBD) through batch adsorption studies which yielded a maximum adsorption capacity of 100 mg/g. Pseudo-firstorder and pseudo-second-order kinetic models studies administered on the adsorption process data revealed that both models described the process very well with pseudo-second-order model having an edge over pseudo-first-order model. Langmuir and Freundlich isotherms were suitable representation of the process more than Temkin isotherm model. Thermodynamic studies revealed that the adsorption process was spontaneous and endothermic in nature; and also, entropy of the process increased with increase in temperature of the system. Boundary layer and intra-particle diffusion steps were necessary for the adsorption of CBD on the adsorbent. The locally sourced dolomite adsorbent was found to be very good for removal of CBD from waste-waters and can be used adequately as a cheaper alternative to expensive commercial activated carbon