Biosorption and recovery of Au3+ using Rhizobium (BJVr12) and its polysaccharides

Date

3-1996

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Juanita C. Mamaril

Abstract

Polyurethane foam as carriers are more effective in adsorbing cells and its polysaccharides and eventually the gold ions. It was found out that the lower the flow rate applied the greater the amount of gold adsorbed by the loaded carriers. At .5 ml/min the loaded foams and beads were able to adsorb .1902 and .1258 mg Au / g cell , on the average. respectively Gold desorption was done using five solutions at different concentrations namely HCI (4.0 M, 6.0 M and 8.0 M) , EDTA (0.006 M, 0.05 M, 0.15 M), NaSCN (0.05 M, 0.10 M, 0.05M) and NaCN (0.05 M, 0.10M, 0.15 M) and a saturated solution of NaCI. The higher concentrations of the desorbing solutions desorb more gold than the lower concentrations However, the trend is not the same for the EDTA solution. The .006 M EDTA solution recovers a higher percentage of gold than the 0.15 M and 0.05 M solutions. NaSCN was the most effective desorbing solution from the array of solutions that were used. A 0.15 M NaSCN solution could desorb up to 82.32%, 8.0 M HCI 63.39 a. , saturated NaCI solution, 44.8.4 %, and a 0.006 M EDTA solution 40.90% . The amount of gold desorbed per gram of fresh cell was highest when a 0.15 M NaSCN and 0.15 M NaCN solution was used which gave .2626 and .2892 mg Au desorbed per gram fresh cell.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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