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Cystine-modified biomass for Cd(II) and Pb(II) biosorption
Junxia Yu1, Mi Tong, Xiaomei Sun
1College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China.
Journal of Hazardous Materials
|October 27, 2006
Summary
Modified baker's yeast biomass effectively adsorbs heavy metals cadmium (Cd2+) and lead (Pb2+). This cystine-enhanced biosorbent shows high capacity and reusability for wastewater treatment.
Area of Science:
- Environmental Science
- Materials Science
- Biotechnology
Background:
- Heavy metal contamination in water poses significant environmental and health risks.
- Biosorption using modified biomass offers a sustainable approach for metal remediation.
- Baker's yeast biomass is an abundant and low-cost biological material.
Purpose of the Study:
- To enhance the adsorption capacity of baker's yeast biomass for cadmium (Cd2+) and lead (Pb2+) ions.
- To investigate the effectiveness of cystine crosslinking for heavy metal removal.
- To evaluate the reusability of the modified biosorbent.
Main Methods:
- Baker's yeast biomass surface was modified by crosslinking with cystine and glutaraldehyde.
- X-ray photoelectron spectroscopy and microscopy were used for characterization.
- Batch adsorption experiments were conducted to determine metal ion uptake.
- Fourier-transform infrared (FTIR) spectroscopy identified functional groups involved in adsorption.
Main Results:
- Modified biomass exhibited significantly higher adsorption capacities for Cd(2+) (11.63 mg g(-1)) and Pb(2+) (45.87 mg g(-1)) compared to pristine biomass.
- Adsorption equilibrium was reached over time for both metal ions.
- The Langmuir isotherm model effectively described the adsorption process.
- The biosorbent demonstrated good reusability over six cycles with minimal loss in capacity.
Conclusions:
- Cystine modification enhances the biosorption potential of baker's yeast for Cd(2+) and Pb(2+).
- The modified biomass is a promising, cost-effective, and reusable material for heavy metal removal from wastewater.
- Surface functional groups like carboxyl, amide, and hydroxyl play a key role in metal ion binding.
