Keywords: nitrate, adsorption kinetics, intra-particle diffusion, diffusion modelling, first-order equation, MCR, modified corn residue, RCR, raw corn residue, epichlorohydrin, dimethylamine, Freundlich isotherm, adsorbent dose, agricultural residues, anionic adsorbents, water treatment, wastewater treatment
Adsorption kinetics of nitrate from aqueous solutions onto modified corn residue
The adsorption kinetics of nitrate from aqueous solutions onto Modified Corn Residue (MCR) was studied. The Raw Corn Residue (RCR) was modified by epichlorohydrin in the presence of pyridine, and the adsorption kinetics was investigated in batch experiments. The results showed that the MCR adsorbs nitrate effectively, and the maximum adsorption capacities were 80.84 mg g
−1and 72.73 mg g
−1at 20°C and 40°C, respectively. The adsorption of nitrate under different initial concentrations all fit the first-order reaction. The adsorption rates were controlled by both membrane diffusion and intra-particle diffusion.