Abstract
In this paper, a high performance adsorbent (hydrous manganese oxides onto acylamino and hydroxyl functionalized hydrogel) containing manganese oxide was prepared by the cross-linking polymer; the novel composite adsorbent has an excellent adsorption for Hg(II) removal. The adsorbent was characterized by scanning electron microscopy and Fourier transform infrared analysis, the hydrogel adsorbent had a typical three-dimensional network structure, and manganese oxides particles were dispersed into the channel and pores structure. The adsorption of Hg2+ in water was tested by using the adsorbent. The results show that the adsorption isotherms were fitted well with Langmuir model, and the maximum Hg2+ adsorption capacity was 0.654 mmol g-1 (131.2 mg g-1). The adsorption kinetics followed a pseudo-second-order equation, and the adsorption equilibrium can be reached in the first 120 min. The optimum pH of adsorption was determined to be 8.0. The desorption efficiency of 94% can be reached using 0.7 mol L-1 HCl as the regeneration agent. The results suggest that this material can be a promising adsorbent for Hg2+ removal in several industrial processes.
Highlights
Mercury pollution has been arousing much attention because of its high toxicity and long-term existence in aqueous solution
We investigated the adsorption behavior of Hg(II) on composite adsorbent, which was prepared by loading of hydrous manganese oxides onto acylamino and hydroxyl functionalized hydrogel (HMO-AHFH)
For HMOAHFH, the manganese oxide particles were dispersed into the channels and pores of AHFH; the shape of the colloid which is not doped with manganese oxide particles is round or oval, belonging to the micron particle size range
Summary
Mercury pollution has been arousing much attention because of its high toxicity and long-term existence in aqueous solution. Once released into the environment, mercury can accumulate in the food chain and cause neurological, nephrological, reproductive, and genetic disorders in humans (Valentino et al ; Mearns et al ). It is essential to develop effective and economical methods to remove mercury from contaminated water. Several methods concentrated on the removal of Hg(II) from wastewater have been reported, including chemical precipitation (Blue et al ), ion exchange (Chiarle et al ; Dong et al ), membrane separation (Urgun-Demirtas et al ) and adsorption (Natale et al ; Khaloo et al ). Adsorption is an easy, economical and promising method for wastewater purification due to its high selectivity, simplicity of design and separation of various pollutants. The adsorbent plays a key role in the adsorption process
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
