Biosorption of Mn2+ by Rhizobium sp. BJ-Vr12 exopolysaccharides and acid modified coconut husk

Date

3-2000

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Evamarie P. Capareda

Co-adviser

Estella Paner

Abstract

ABSTRACT

AUDREY MICHIKU MAGBOJOS NUESCA. College of Arts and Sciences, University of the Philippines Los Banos, March 2000. Biosorption of Mn2+ by Rhizobium sp. BJVr-12 Exopolysaccharides and Acid Modified Coconut Husk.

Adviser: Dr. Evamarie Capareda

Co-Adviser: Mrs. Estella Paner

The capacity of acid modified coconut husk and Rhizobium biomass (CH + EPS) to adsorb manganese in laboratory prepared solutions was evaluated against adsorption by acid modified coconut husk (CHUSK) and activated carbon (AC CARBON). Experiments for CH + EPS gave maximum percent adsorption of 95.49% after 20 hrs of shaking and 98.73% after 4 hrs of column run. The percentage removal of Mn2+ directly increased with the amount of adsorbent. A percent reduction of 98.53% was obtained for 8.00 grams of CH + EPS after the 24 hr shaking period. This value was analyzed to be significantly higher than those computed for 2.5 gram (97.50%) and 1.0 gram (95.20%) weights. Flowrate was found to be crucial in manganese uptake. Column flowrate was optimized at 1.00 ml/min. The adsorption efficiency was greater at low influent concentration and long residence time. This occurred when the biotrap exhibited an effective reduction (98.73%) at an initial concentration of 30 ppm Mn'solution. Consistent sorption increase was observed up to the fourth hour of continuous flow of solution. An average of 96.75% was recovered from the total manganese adsorbed with the use of 6M HCL. Recycling of the column was conducted giving a 1.98% difference from the result for initial column run adsorption. In tests with wastewater containing 43.31 ppm Mn2+, the three adsorbents tested, CH + EPS (67.63%), CHUSK (62.62%) and AC CARBON (37.52%) displayed significantly different manganese adsorption.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2000 C4 N84

Document Type

Thesis

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