TY  - JOUR
N1  - cited By 297
SP  - 327
TI  - A review on geopolymers as emerging materials for the adsorption of heavy metals and dyes
AV  - none
EP  - 339
SN  - 03014797
PB  - Academic Press
N2  - The world water resources are contaminated due to discharge of a large number of pollutants from industrial and domestic sources. A variety of a single and multiple units of physical, chemical, and biological processes are employed for pollutants removal from wastewater. Adsorption is the most widely utilized process due to high efficiency, simple procedure and cost effectiveness. This paper reviews the research work carried out on the use of geopolymer materials for the adsorption of heavy metals and dyes. Geopolymers possess good surface properties, heterogeneous microstructure and amorphous structure. The performance of geopolymers in the removal of heavy metals and dyes is reported comparable to other materials. The pseudo-second order kinetics and Langmuir isotherm models mostly fit to the adsorption data suggesting homogeneous distribution of adsorption sites with the formation of monolayer adsorbate on the surface of geopolymers. Adsorption of heavy metals and dyes onto geopolymers is spontaneous, endothermic and entropy driven process. Future research should focus on the enhancement of geopolymer performance, testing on pollutants other than heavy metals and dyes, and verification on real wastewater in continuous operation. © 2018 Elsevier Ltd
KW  - adsorbent; ammonia; arsenic; cadmium; calcium; cesium; chromium; cobalt; congo red; copper; crystal violet; direct blue 15; direct sky blue 5 B; dye; geopolymer; heavy metal; lead; magnesium; methyl orange; methyl violet; methylene blue; nickel; phosphorus; polymer; reagent; sulfate; unclassified drug; zinc; coloring agent; heavy metal
KW  -  adsorption; cost analysis; dye; heavy metal; perforation; pollutant removal; polymer; research work; wastewater; wastewater treatment; water resource
KW  -  adsorption kinetics; biogeochemistry; chemical structure; entropy; fecal coliform; Fourier transform infrared spectroscopy; isotherm; Langmuir isotherm; polymerization; Review; slag; structure analysis; surface area; surface property; thermodynamics; waste component removal; waste water; waste water management; water pollutant; water pollution; X ray diffraction; adsorption; chemistry; isolation and purification; kinetics; water pollutant
KW  -  Adsorption; Coloring Agents; Kinetics; Metals
KW  -  Heavy; Waste Water; Water Pollutants
KW  -  Chemical
ID  - scholars9876
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052861279&doi=10.1016%2fj.jenvman.2018.07.046&partnerID=40&md5=244d933ae31e72cded35eccb6ffe30e5
JF  - Journal of Environmental Management
A1  - Siyal, A.A.
A1  - Shamsuddin, M.R.
A1  - Khan, M.I.
A1  - Rabat, N.E.
A1  - Zulfiqar, M.
A1  - Man, Z.
A1  - Siame, J.
A1  - Azizli, K.A.
VL  - 224
Y1  - 2018///
ER  -