Removal of cadmium ions (Cd2+) from aqueous solutions using Rhizobium sp. (BJVr12) cells immobilized in coconut husk

Date

3-1999

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Estella T. Paner

Co-adviser

Elvira T. Tumlos

Abstract

RONIL EMMAVI JULATON REMOQUJLLO. College of Arts and Sciences. University of the Philippines at Los Banos. March, 1998. Removal of Cadmium ions (Cd2+) from Aqueous Solution using Rhizobium sp. (BJVr12) cells Immobilized in Coconut husk.

Adviser : Mrs. Estella T. Paner

The capacity of Rhizobium sp. (BJvr12) immobilized in coconut husk to adsorb Cd2+ was studied. A maximum of 98.68% removal of Cd2+ or 0.1776 mg Cd2+ cells was observed after two hours of elution at a flowrate of 1 ml/min.

The optimum flow rate for adsorption was determined by passing a solution containing 30 ppm of Cd2+ through the column at different flow rates. The slower flow rate (1mL/min) gave the highest adsorption.

The Langmuir and Freundlich constants for Rhizobium sp. (BJVr12) cells immobilized in coconut husk are: Qo= 0.04 mM Cd2+ g-1 biomass; b= -19.42

mmol-1 Cd2+ g-1 Cd2+; and K= 0.7221 mmol Cd2+ biomass; n= -1.4296 g-1 biomass respectively while those for the coconut husk alone are: Qo= 0.0023 mM Cd2+ g-1 biomass; b= -942.64 mmol-1 Cd2+ g-l; and K= 0.2916 mmol Cd2+ biomass and n= -18.027g biomass. High values for Qo and K suggests many available binding sites for Cd2+ on the bacterial surface. High values for b and n suggests high affinity of the biomass for Cd2+.

Recovery of the biosorbed cadmium from the Rhizobium sp. (BJVr12) cells immobilized in coconut husk using hydrochloric acid (6M) and citric acid (0.3mM) was also studied. Results show that hydrochloric acid desorbed about 71.87% Cd2+ compared to citric acid which only desorbed 25.32% Cd2+.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1999 C4 R46

Document Type

Thesis

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