Efficient Adsorption of Cd from Aqueous Solution Using Metakaolin Geopolymers

Overview

Journal Environ Sci Pollut Res Int

Publisher Springer

Specialties Environmental Health
Toxicology

Date 2019 Oct 6

PMID 31586316

Citations 2

Authors

Tian Lan

Pinfang Li

Fazal Ur Rehman

Xiangling Li

Wei Yang

Shiwen Guo

Affiliations

Soon will be listed here.

Abstract

In this study, geopolymers were prepared using metakaolin (MK) raw material under different alkali activator moduli (SiO/NaO = 0.8, 1.2, 1.6, 2.0 M ratio) in order to analyze their capacity and mechanism for adsorbing cadmium (Cd) from solution. Instrumental analyses including X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared (FTIR), and Brunauer-Emmett-Teller (BET) were performed to examine the mineralogical features of the MK and geopolymers before and after Cd adsorption. The effect of initial pH, temperature, contact time, and initial concentration on Cd adsorption performance was studied to obtain the equilibrium isotherm. Kinetic data of the geopolymers fitted the pseudo-second-order kinetic model well. Moreover, the adsorption equilibrium data of Cd adsorbed by the geopolymers fitted the Langmuir model better than the Freundlich model. The result shows that chemisorption dominates Cd adsorption by geopolymers and that the adsorption capacity differs when prepared using different alkali-activated modulus agents. The geopolymer prepared using an alkali activator modulus of 0.8 M (molar ratio) exhibited the best Cd adsorption performance with a maximum adsorption capacity of 70.3 mg g. The removal rate of Cd by geopolymer still remained above 85% after five round of recycling.

Citing Articles

Research and Application Progress of Geopolymers in Adsorption: A Review.

Xu J, Li M, Zhao D, Zhong G, Sun Y, Hu X Nanomaterials (Basel). 2022; 12(17).

PMID: 36080037 PMC: 9457617. DOI: 10.3390/nano12173002.

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption.

Caetano A, Carvalheiras J, Senff L, Seabra M, Pullar R, Labrincha J Materials (Basel). 2022; 15(4).

PMID: 35207992 PMC: 8877568. DOI: 10.3390/ma15041453.

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