Screening of hexavalent chromium biosorbent from marine algae |
| |
Authors: | D-C Lee C-J Park J-E Yang Y-H Jeong H-I Rhee |
| |
Institution: | (1) Division of Biological Environment, Kangwon National University, Chunchon 200-701, Korea, KR;(2) Division of Food Science and Biotechnology, Kangwon National University, Chunchon 200-701, Korea e-mail: rheehae@kangwon.ac.kr Tel.: +82-361-2506481 Fax: +82-361-2543835, KR |
| |
Abstract: | A highly chromate-selective biosorbent with high adsorption capacity was found by examining the chromate adsorption capacities
of 48 species of red, brown, or green marine algae sampled from the east coast of Korea. As a result of screening, a red marine
alga showed excellent adsorption characteristics. It was identified as Pachymeniopsis sp. The timing of the sampling of Pachymeniopsis sp. did not affect the adsorption capacity of the alga but the optimum period for mass collection was April–May. The alga
also showed high selectivity for chromate and its adsorption capacity for other heavy metal ions such as cadmium and manganese
was relatively low. An investigation of the adsorption isotherm of Pachymeniopsis sp. as a dried powder for chromate adsorption at 25 °C showed Langmuir-type dependence. The maximum chromate adsorption capacity
of the selected alga was about 225 mg/g. The desorption of adsorbed chromate from Pachymeniopsis sp. was done by treating samples with 1 N NaOH. It was confirmed that ion exchange type adsorption was observed with anion
exchangers but not with cation exchangers. Therefore it is believed that the chromate adsorption is based on the anionic exchange
of Pachymeniopsis sp.
Received: 6 October 1999 / Received last revision: 19 January 2000 / Accepted: 4 February 2000 |
| |
Keywords: | |
本文献已被 PubMed SpringerLink 等数据库收录! |
|