Breakthrough curve for adsorption of mercury (ii) on polyaminated highly porous chitosan beads

发表于：Water Science & Technology · 年份：1997 · DOI：10.1016/s0273-1223(97)00119-4 · 被引用次数：74 · 研究领域：Adsorption and biosorption for pollutant removal、Recycling and Waste Management Techniques

The equilibrium isotherm and the breakthrough curve for adsorption of Hg(II) on polyaminated highly porous chitosan beads (PEI-CS) were compared with those for Unicellex UR-120H which was the best commercial chelate resin for removal of Hg(II) in Japan. As the intraparticle effective diffusivity D eff in PEI-CS was about two times larger than that in UR 120H, and adsorption capacity Hg(II) on PEI-CS was also larger than that on UR-120H, adsorption of Hg(II) on PEI-CS appeared feasible technically. The intraparticle concentration profiles of Hg(II) were measured for different period of time using X-ray micro-analyzer. The value of D eff was almost constant at 4 Re ′ 7, and the mean value was 3.86 × 10−12 m2/s. The value od D eff increased in proportion to the influent concentration of Hg(II) C o,Hg . The pore diffusivity and surface diffusivity were determined using D eff based on the parallel transport model of surface and pore diffusions. The result showed that both the pore and surface diffusions of Hg(II) in PEI-CS particle were significant.