Efficient adsorption and reduction of Cr(VI) by Zr4+ cross-linked magnetic chitosan/polyaniline composite

A novel sludge-based biochar composite adsorbent CS/SBC-H3PO4 for efficient Cr(vi) removal from aqueous solution

“…The preparation of CS/SBC-H 3 PO 4 was carried out according to the method of Xu et al 17 First, 0.5 g of CS was added to 50 mL of acetic acid solution (water: acetic acid = 49 mL: 1 mL) and the mixture was stirred well to dissolve CS completely, which was recorded as solution a. Then, 0.4 g of SBC-H 3 PO 4 was added into a 500 mL beaker, solution a was poured into the beaker, 50 mL of deionized water was added, and then 6 mL of 25% glutaraldehyde was added, and finally, the mixture was stirred for 1 h at 70 °C.…”

“…The adsorption capacity of Cr( vi ) was calculated using eqn (1): 17 where q e is the Cr( vi ) adsorption capacity at equilibrium, mg g −1 ; C 0 and C e are the initial and post-equilibrium Cr( vi ) concentrations, respectively, mg L −1 ; V is the solution volume, L ; m is the adsorbent dosage, mg.…”