Unique and outstanding cadmium sequestration by polystyrene-supported nanosized zirconium hydroxides: a case study

摘要: Water pollution by heavy metals remains a serious environmental and health issue. Herein, new hybrid adsorbent was prepared for selective Cd(II) sequestration immobilizing nanosized zirconium hydroxides (HZO) onto macroporous cation exchanger. The positively charged SO3−H group within the host matrix can accelerate target ions diffusion enrichment, combining with strong adsorption HZO nanoparticles. Solution pH influence proves that be efficiently eliminated HZO-PS in wide range of 2.5–7.0 negligible Zr(IV) releases. Both PS exhibit similar fast kinetic behaviors approaching sorption equilibrium 150 min. Such results ascribed to unique surface-charged groups accelerating diffusion. Moreover, also exhibits favorable selectivity presence common cations at high levels. Fixed-bed column experiments further demonstrate its efficient applicability treated capacity 750 bed volume (BV) per run exhausted readily regenerated using binary HNO3 Ca(NO3)2 mixtures repeated use. All suggest material is promising cadmium retention water.