Arsenic adsorption by polyvinyl pyrrolidone K25 coated cassava peel carbon from aqueous solution

摘要

Sorption of arsenic from aqueous solution was carried out using polyvinyl pyrrolidone K25 coated cassava peel carbon (PVPCC). Batch experiments were conducted to determine the effect of contact time, initial concentration, pH and desorption. Batch sorption data's were fitted to Lagergren kinetic studies. Column studies were also conducted using PVPCC as adsorbent. The optimized flow rate of 2.5 mL min~(-1) and bed height 10 cm were used to determine the effect of metal ion concentration on removal of As(V). BDST model was applied to calculate the adsorption capacity (N_0) of column. The N_0 value of 2.59 × 10~(-5), 4.21 × 10~(-5), 4.05 × 10~(-5), 4.26 × 10~(-5) and 3.2 × 10~(-5) mg g~(-1) were obtained for 0.5, 1.0, 1.5, 2.0 and 2.5 mg L~(-1) of As(V), respectively. The batch sorption proved to be more efficient than the column sorption. The sorption of As(V) and the nature of the adsorbent was examined by Fourier transmission infrared spectroscopy (FTIR) and X-ray diffraction (XRD) studies, respectively.