Testing the Performance of Rice Husk Biochar and Magnesium/Aluminum Layered Double Hydroxide for Lead Removal from Aqueous Solution

Articles in Press

Document Type : Research Paper

Authors

1 Department of Soil Science and Engineering, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

2 Academic member/ Sari Agricultural Sciences and Natural Resources University, Sari, Iran

3 Department of Soil Science and Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

Abstract

Lead contamination of water resources as an environmental challenge requires the development of highly efficient decontamination methods such as the use of efficient, non-toxic and low-cost adsorbents. This study was conducted to compare the performance of rice husk biochar (RHB) and layered double hydroxides (Mg/Al-LDH) in removing lead from aqueous solutions. In this study, biochar was prepared from the pyrolysis of rice straw and stubble residues at 500°C under limited oxygen conditions and magnesium/aluminum layered double hydroxides at a ratio of 2:1 by co-precipitation method. The evaluation of parameters including adsorption kinetics, isotherm, and the initial solution pH on lead adsorption was performed. According to the results, kinetic studies showed that lead adsorption by RHB and LDH reached equilibrium in 60 and 240 min, respectively and the pseudo-second-order kinetic model showed high ability to predict the adsorption kinetics. with the increasing of initial solution pH, lead adsorption by both adsorbents increased. The Langmuir models showed high ability to predict the lead adsorption behavior by the adsorbents. The maximum lead adsorption capacity by RHB and LDH was 297.83 and 173.46 mg/g, respectively. The results of this study confirm that rice husk biochar can be considered a superior, low – cost, non – toxic and environmentally friendly option for the decontamination of lead from aquatic environments due to the high accessibility of active sites and stable performance over a wide pH range.

Keywords

Main Subjects

Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 09 February 2026

Files

Share

How to cite

Statistics