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Influence of pH, ionic strength and temperature on lead biosorption by Gelidium and agar extraction algal waste

Paper ID Volume ID Publish Year Pages File Format Full-Text
36658 45139 2005 9 PDF Available
Title
Influence of pH, ionic strength and temperature on lead biosorption by Gelidium and agar extraction algal waste
Abstract

An algal industrial waste from an agar extraction process was used as an inexpensive and efficient biosorbent for Pb2+ removal from aqueous solutions. This biosorbent was compared with the alga Gelidium, the raw material for agar extraction. The effects of various physico-chemical parameters on Pb2+ biosorption were investigated in a batch contactor in order to explain the adsorption mechanism. Kinetic and equilibrium experiments were conducted at different values of pH (3.0, 4.0 and 5.3), ionic strength (0.001 and 0.1 M) and temperature (10–45 °C). Uptake kinetics follows the pseudo-second-order Lagergren model and equilibrium is well described by Langmuir isotherm. Maximum biosorption capacities for Gelidium algae and algal waste were found to be 64 ± 2 and 44 ± 3 mg Pb2+/g biosorbent, respectively. Biosorption of Pb2+ was highly pH dependent, decreasing with pH. Good performances were obtained even under high ionic strength values. Changes in standard enthalpy and activation energy during biosorption were determined.

Keywords
Biosorption; Lead; Gelidium; Agar extraction algal waste; Isotherms
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Influence of pH, ionic strength and temperature on lead biosorption by Gelidium and agar extraction algal waste
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 10, October 2005, Pages 3267–3275
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us