Biosorption of cadmium by CO 2-fixing microalga Scenedesmus obliquus CNW-N

Chun Yen Chen; Hao Wei Chang; Pei Chun Kao; Jian Liang Pan; Jo Shu Chang

doi:10.1016/j.biortech.2011.11.124

Biosorption of cadmium by CO ₂-fixing microalga Scenedesmus obliquus CNW-N

Chun Yen Chen, Hao Wei Chang, Pei Chun Kao, Jian Liang Pan, Jo Shu Chang

Research output: Contribution to journal › Article › peer-review

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Abstract

An efficient CO ₂-fixing indigenous microalga Scenedesmus obliquus CNW-N was used as the biosorbent to remove cadmium from aqueous solution. The microalga was grown with continuous feeding of 2.5% CO ₂, achieving a maximum CO ₂ consumption rate of 495mg/l/d and a biomass production of 2.56g/l. Cadmium (Cd) biosorption by S. obliquus CNW-N was optimal at pH6.0 and 30°C. For an initial cadmium concentration of 50mg/l, the biosorption capacity tended to decrease with an increase in biosorbent, while the cadmium removal efficiency was nearly 100% when the biosorbent loading was higher than 0.6g. The biosorption kinetics followed the pseudo-second order adsorption model. The adsorption equilibrium obeys Langmuir isotherm with an estimated maximum capacity of 68.6mg/g and a saturation coefficient of 0.101l/mg. The cadmium-loaded microalgal biomass could be regenerated preferably with 0.05M CaCl ₂, as the regenerated biosorbent retained good adsorption capability after five consecutive adsorption/desorption cycles.

Original language	English
Pages (from-to)	74-80
Number of pages	7
Journal	Bioresource technology
Volume	105
DOIs	https://doi.org/10.1016/j.biortech.2011.11.124
Publication status	Published - 2012 Feb

All Science Journal Classification (ASJC) codes

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

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10.1016/j.biortech.2011.11.124

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title = "Biosorption of cadmium by CO 2-fixing microalga Scenedesmus obliquus CNW-N",

abstract = "An efficient CO 2-fixing indigenous microalga Scenedesmus obliquus CNW-N was used as the biosorbent to remove cadmium from aqueous solution. The microalga was grown with continuous feeding of 2.5% CO 2, achieving a maximum CO 2 consumption rate of 495mg/l/d and a biomass production of 2.56g/l. Cadmium (Cd) biosorption by S. obliquus CNW-N was optimal at pH6.0 and 30°C. For an initial cadmium concentration of 50mg/l, the biosorption capacity tended to decrease with an increase in biosorbent, while the cadmium removal efficiency was nearly 100% when the biosorbent loading was higher than 0.6g. The biosorption kinetics followed the pseudo-second order adsorption model. The adsorption equilibrium obeys Langmuir isotherm with an estimated maximum capacity of 68.6mg/g and a saturation coefficient of 0.101l/mg. The cadmium-loaded microalgal biomass could be regenerated preferably with 0.05M CaCl 2, as the regenerated biosorbent retained good adsorption capability after five consecutive adsorption/desorption cycles.",

author = "Chen, {Chun Yen} and Chang, {Hao Wei} and Kao, {Pei Chun} and Pan, {Jian Liang} and Chang, {Jo Shu}",

note = "Funding Information: The authors gratefully acknowledge financial support from financial support from Taiwan{\textquoteright}s Ministry of Economic Affairs (Grant No. 98-EC-17-A-10-S2-0066 ) and Taiwan{\textquoteright}s National Science Council under Grant Nos. NSC 98-2221-E-006-240-MY3 and NSC 99-3113-P-110-001 and NSC 100-3113-E-006-016 . The support from NCKU{\textquoteright}s top university project (with 5-year-50-billion funding from Taiwan{\textquoteright}s Ministry of Education) is also appreciated. ",

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AU - Pan, Jian Liang

AU - Chang, Jo Shu

N1 - Funding Information: The authors gratefully acknowledge financial support from financial support from Taiwan’s Ministry of Economic Affairs (Grant No. 98-EC-17-A-10-S2-0066 ) and Taiwan’s National Science Council under Grant Nos. NSC 98-2221-E-006-240-MY3 and NSC 99-3113-P-110-001 and NSC 100-3113-E-006-016 . The support from NCKU’s top university project (with 5-year-50-billion funding from Taiwan’s Ministry of Education) is also appreciated.

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N2 - An efficient CO 2-fixing indigenous microalga Scenedesmus obliquus CNW-N was used as the biosorbent to remove cadmium from aqueous solution. The microalga was grown with continuous feeding of 2.5% CO 2, achieving a maximum CO 2 consumption rate of 495mg/l/d and a biomass production of 2.56g/l. Cadmium (Cd) biosorption by S. obliquus CNW-N was optimal at pH6.0 and 30°C. For an initial cadmium concentration of 50mg/l, the biosorption capacity tended to decrease with an increase in biosorbent, while the cadmium removal efficiency was nearly 100% when the biosorbent loading was higher than 0.6g. The biosorption kinetics followed the pseudo-second order adsorption model. The adsorption equilibrium obeys Langmuir isotherm with an estimated maximum capacity of 68.6mg/g and a saturation coefficient of 0.101l/mg. The cadmium-loaded microalgal biomass could be regenerated preferably with 0.05M CaCl 2, as the regenerated biosorbent retained good adsorption capability after five consecutive adsorption/desorption cycles.

AB - An efficient CO 2-fixing indigenous microalga Scenedesmus obliquus CNW-N was used as the biosorbent to remove cadmium from aqueous solution. The microalga was grown with continuous feeding of 2.5% CO 2, achieving a maximum CO 2 consumption rate of 495mg/l/d and a biomass production of 2.56g/l. Cadmium (Cd) biosorption by S. obliquus CNW-N was optimal at pH6.0 and 30°C. For an initial cadmium concentration of 50mg/l, the biosorption capacity tended to decrease with an increase in biosorbent, while the cadmium removal efficiency was nearly 100% when the biosorbent loading was higher than 0.6g. The biosorption kinetics followed the pseudo-second order adsorption model. The adsorption equilibrium obeys Langmuir isotherm with an estimated maximum capacity of 68.6mg/g and a saturation coefficient of 0.101l/mg. The cadmium-loaded microalgal biomass could be regenerated preferably with 0.05M CaCl 2, as the regenerated biosorbent retained good adsorption capability after five consecutive adsorption/desorption cycles.

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Biosorption of cadmium by CO ₂-fixing microalga Scenedesmus obliquus CNW-N

Abstract

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