| 초록 |
To efficiently remove nickel ions from actual industrial wastewater which is coexisted with high sodium concentration, powdered sericite was immobilized as a bead form by entrapment method using sodium alginate. The beads with surface area of 7.1m2/g were not untangled to ~45℃ and ~pH 11.0 in wastewater and have excellent mechanical strength and swelling characteristics. It was also confirmed that natural sericite bead did not appear the characteristic peak for nickel ions, nickel-adsorbed beads clearly shows the peak of nickel ions as about 4.00wt% by means of SEM-EDX analysis. The effect of sodium ions on nickel removal was negligible and the maximum adsorption capacity using Langmuir equation was 10.743 mg/g at pH 7.5 of wastewater in batch. The nickel ions can be removed from actual wastewater over 95% up to 90(1.0mL/min) and 140 bed volumes (0.5mL/min), respectively and 7 bed volumes of 20mM of HNO3 solution was required to get 96% of nickel desorption in continuous process using packed-bed column. Also, breakthrough point of nickel ions could be still maintained as 130 up to the 2nd cycle by reused immobilized sericite beads. |
