Preliminary studies on adsorption of heavy metal ions in modified coconut coir columns

Date

4-1993

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Aloysius U. Baes

Abstract

The effect of bed height and flow rate on the column adsorption of heavy metal ions in sulfuric acid-formaldehyde-treated coconut coir was studied. Columns of constant internal diameter of 46 mm were used for the column runs. A constant flow rate of 20 mL per minute and 40 mL per minute using 100 and 150 mm column packings equivalent to a total exchange capacity of 64.8 and 36.4 meq, respectively were used in these studies. Solutions containing 100 ppm metal ions (either manganese(II), copper(II), or lead(II) ) were passed through columns and the metal concentrations in the effluent solutions were analyzed. Exchange resin was changed for each column run. Break-through curves of each column were obtained by plotting the effluent concentration against volume collected. The break- through capacity, arbitrarily chosen as the point where the effluent and influent concentration ratio reaches 0.05 for Mn24, Cu24, and Pb24 was determined from the curves. Results showed that for all metal ions break-through capacity value increased as the bed height was increased. The observed increase were 2.91 to 3.4 0.189 to 0.299, and 3.15 to 3.21 meg for Pb2+, Hn9 and Cu2+, respectively. The relatively low break through capacity could be attributed to the relatively hi,, flow rate used. At increased flow rate metal ions have less time to diffuse through the renin particle ,nd thus are prevented from reaching all exchanging groups. Decreasing the flow rate of the column with 100 mm packing height from 40 to 20 mL per minute has greatly increased the break-through capacity. The observed change were 2.91 to 5.59, 3.15 to 3.91, and 0.189 to 0.303 meg for Pb 2+, Cu 2+, and Sin 2+, respectively. This increase corresponds to 4.16, 1.17 and 0.18 percent difference in percentage of the total exchange capacity used for each respective metal. ased on break-through capacities, the trend of metal Preference was Mn 2+ < Cu2+ < pb2.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1993 C4 P33

Document Type

Thesis

This document is currently not available here.

Share

COinS