Remediation of arsenic-contaminated water by green zero-valent iron nanoparticles.

The optimal conditions for the green synthesis of nano zero-valent iron (G-NZVI) using mango peel extract were investigated using a Box-Behnken design approach. Three factors were considered, namely the ratio of iron solution to mango peel extract ratio (1:1-1:3), feeding rate of mango peel extract (1-5 mL min), and agitation speed (300-350 rpm). The results showed that the optimal conditions for the synthesis of G-NZVI for arsenate removal were a 1:1 ratio of iron solution to mango peel extract, a mango peel extract feeding rate of 5 mL min, and an agitation speed of 300 rpm.