Removal of organic compounds by alginate gel beads with entrapped activated carbon.
The adsorption of alginate gel (AG) beads and AG with activated carbon entrapped (AG-AC) beads prepared using different types of metal ions were investigated by measuring the removal of several organic compounds with different charges and size. AG-AC beads prepared in a CaCl2 solution adsorbed strongly positively charged compounds as well as electrically neutral and low molecular weight compounds such as p-chlorophenol. However, a high molecular weight humic acid was not adsorbed by AG-AC. The AG-AC selectively adsorbed p-chlorophenol from a humic acid solution. The adsorption capacity obtained from the adsorption isotherm of AC entrapped in AG was compared with that of AC. The AG-AC beads prepared in a solution of FeCl3 were able to specifically adsorb negatively charged gallic acid. Thus, entrapping AC into AG resulted in the selective adsorption.
Lin
Yong-Bo
YB
Graduate School of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo 060-0810, Japan.
Fugetsu
Bunshi
B
Terui
Norifumi
N
Tanaka
Shunitz
S
D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D002244:Carbon; D008970:Molecular Weight; D009930:Organic Chemicals / Q000302:isolation & purification; D013696:Temperature; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
D000464:Alginates; D009930:Organic Chemicals; D014873:Water Pollutants; D002244:Carbon