Magnetite-based pumice silica nanocomposite for lead adsorption from aqueous solution: The green synthesis approach

Genet Tsegaye; Zebene Kiflie; Jemal Fito Nure; Abera D. Ambaye

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Magnetite-based pumice silica nanocomposite for lead adsorption from aqueous solution: The green synthesis approach

Updated：2026-01-06

- Magnetite-based pumice silica nanocomposite for lead adsorption from aqueous solution: The green synthesis approach
- Magnetite-based pumice silica nanocomposite for lead adsorption from aqueous solution: The green synthesis approach
- 中国化学工程学报（英文版） 2025年82卷第6期页码：281-293
- Affiliations：
  
  1. School of Chemical and Biochemical Engineering, Addis Ababa Institute of Technology, Addis Ababa University, Addis Ababa,Ethiopia,1176
  2. Bio and Emerging Technology Institute Addis Ababa,Ethiopia,5954
  3. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, 1 Jorissen St, Johannesburg 2000, South Africa
  4. Department of Chemical and Materials Engineering, University of South Africa, Private Bag X6, Florida Gauteng 1709, South Africa
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2025
- Accepted：
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Genet Tsegaye, Zebene Kiflie, Jemal Fito Nure, 等. Magnetite-based pumice silica nanocomposite for lead adsorption from aqueous solution: The green synthesis approach[J]. 中国化学工程学报（英文版）, 2025,82(6):281-293.

Genet Tsegaye, Zebene Kiflie, Jemal Fito Nure, Abera D. Ambaye. Magnetite-based pumice silica nanocomposite for lead adsorption from aqueous solution: The green synthesis approach[J]. Chinese Journal of Chemical Engineering, 2025, 82(6): 281-293.
Genet Tsegaye, Zebene Kiflie, Jemal Fito Nure, 等. Magnetite-based pumice silica nanocomposite for lead adsorption from aqueous solution: The green synthesis approach[J]. 中国化学工程学报（英文版）, 2025,82(6):281-293. DOI：

Genet Tsegaye, Zebene Kiflie, Jemal Fito Nure, Abera D. Ambaye. Magnetite-based pumice silica nanocomposite for lead adsorption from aqueous solution: The green synthesis approach[J]. Chinese Journal of Chemical Engineering, 2025, 82(6): 281-293. DOI：

摘要

Abstract

Lead (Pb) is a toxic metal found in wastewater

posing significant health risks to both humans and the environment. This study aimed to develop a novel adsorbent for lead removal from aqueous solutions. This adsorbent

a coffee husk extract-capped magnetite with pumice silica nanocomposite (CHE-capped M/PU/Si-NC)

was synthesized using a completely green approach. The novelty of this study lies in the green synthesis of silica nanoparticles (SiO

-NPs) throughout the process. Coffee husk extract (CHE) served as both a stabilizing and capping agent for the SiO

-NPs

which were synthesized from sodium silicate (Na

SiO

) extracted from bagasse ash (BA). Subsequently

the CHE-capped silica was co-precipitated with phyto-fabricated magnetite and integrated into a pumice matrix to produce the final CHE-capped M/PU/Si-NC adsorbent. The CHE-capped M/PU/Si-NC was characterized using SEM

XRF

FTIR

BET

XRD

TGA

and zeta potential analysis. The surface area of the CHE-capped M/PU/Si-NC was determined to be 313 m

·g

-1

and TGA results indicated good thermal stability up to 690 °C. The zeta potential was measured at -37.7 mV. XRD analysis of CHE-capped M/PU/Si-NC confirmed the formation of magnetite and revealed its crystal structure. The maximum adsorption performance of this material was observed to be 95% at an adsorbent dosage of 2 g·L

-1

and an initial Pb

concentration of 100 g·L

-1

. The adsorption kinetics were best described by the pseudo-second-order kinetic model. The Langmuir isotherm provided a good fit with a maximum adsorption capacity of 150 mg·g

-1

(

= 0.99). Regeneration studies demonstrated that the adsorbent maintained its high Pb

uptake capacity for up to five cycles. Overall

these findings suggest that this adsorbent is a promising candidate for the removal of Pb

from water and wastewater.

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