Application of nano adsorbent of PCMC in water treatment : removal of cationic dyes

In the present study, modified carboxymethyl cellulose (CMC) was prepared to form nano phosphonate carboxy methyl cellulose (PCMC) for adsorptive removal of cationic dyes methylene blue (MB) and crystal violet as models. The produced nano structure and morphology of the PCMC was investigated by Fourier transform infrared (FT-IR) spectroscopic analyses, Transmission Electron Microscopic (TEM), scanning electron microscopy (SEM) and Zeta potential. Adsorption characteristics of the PCMC for removal of a cationic dyes (MB& CV) were investigated spectrophotometrically as a function of initial dye concentration and contact time, adsorbent dosage, solution pH and temperature. The maximum adsorption capacities of the PCMC nano particles-based on adsorbent for both MB and CV were described by the equilibrium adsorption data of both the dyes which fitted well with Langmuir model (R2 =0.9942, 0.9958) for dyes respectively. the kinetics of adsorption followed pseudo-first order model. Investigations on thermodynamic parameters in the temperature range of 298-313 K revealed that the adsorption process is spontaneous and endothermic in nature. On the optimized parameter, the adsorbent shows a very high efficiency and rapid removal property for both the dyes.