Poly(m-phenylenediamine) functionalized Calotropis gigantea fiber for coupled adsorption reduction for Cr(VI)

摘要: Abstract The Calotropis gigantea fiber (CGF)-based adsorbent with excellent hollow tubular structure was designed and developed by using poly( m -phenylenediamine) (PmPD) as the modifier layer. amount of monomer -phenylenediamine (mPD) from 0.5 to 2.0 g firstly optimized response surface methodology. results indicate that modification PmPD enables change original smooth coarse, in addition attaching more N-containing functional groups. Subsequently, adsorption behaviors modified CGF for Cr(VI) were systematically investigated, including influences pH (3.0–10.0), contact time (0–5 h), initial concentration (25–200 mg/L), ion strength (distilled water, tap 1.0 mmol/L 5.0 mmol/L NaCl), other co-existing metal ions such Cu(II), Zn(II) Ni(II). Experimental show > 90% can be achieved within 10 min capacity reach 79.90 mg/g when an is 200 mg/L, demonstrating its fast kinetics high capacity. Meanwhile, as-prepared exhibits a highly selective behavior at lower pH 3.0. During process, coupled reduction Cr(III) evidenced XPS analysis. All information confirm material shows potential low-cost efficient used removal contaminated water.