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Updated: May 30, 2026

Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues

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Lead sorption-desorption from organic residues.

Victor M Duarte Zaragoza¹, Rogelio Carrillo, Carmen M Gutierrez Castorena

¹Colegio de Postgraduados, Edaphology Centre, 36.5 km Carretera, Mexico-Texcoco, Mexico 56152, Mexico.

Environmental Technology

|July 26, 2011

Summary

Coffee husk, vermicompost, and manure effectively adsorb lead (Pb). Vermicompost and manure are recommended for alkaline soils, while coffee pulp suits acidic soils for lead remediation.

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Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Published on: January 7, 2019

Area of Science:

Environmental Science
Soil Science
Biogeochemistry

Background:

Metal mobility and bioavailability in organic materials are governed by sorption and desorption processes.
Understanding these mechanisms is crucial for effective environmental remediation strategies.

Purpose of the Study:

To evaluate the lead (Pb2+) adsorption capacity of coffee husk and pulp residues, vermicompost, and cow manure.
To investigate the underlying mechanisms of lead sorption in these organic materials.

Main Methods:

Assessing the adsorption and desorption of Pb2+ by various organic materials.
Analyzing sorption mechanisms, including precipitation, adsorption, and coprecipitation.
Characterizing material properties such as decomposition degree, pH, cation exchange capacity, and organic matter content.

Main Results:

Organic materials demonstrated high lead retention, with vermicompost and manure removing 98% of Pb from solution.
Sorption mechanisms varied, involving specific/non-specific adsorption, precipitation (PbO, PbFe4O7), and coprecipitation.
Lead desorption was minimal (<2%) from vermicompost and cow manure, indicating strong retention.

Conclusions:

Vermicompost and cow manure are effective for lead remediation in alkaline soils due to induced Pb precipitation.
Coffee pulp residue is suitable for acidic soils where Pb adsorption is the primary retention mechanism.
The choice of organic material for lead remediation should consider soil pH and the dominant metal retention mechanisms.