Geopolymeric adsorbents from fly ash for dye removal from aqueous solution

Journal of Colloid and Interface Science
Lin LiZhonghua Zhu

Abstract

Adsorbents from coal fly ash treated by a solid-state fusion method using NaOH were prepared. It was found that amorphous aluminosilicate geopolymers would be formed. These fly ash-derived inorganic polymers were assessed as potential adsorbents for removal of some basic dyes, methylene blue and crystal violet, from aqueous solution. It was found that the adsorption capacity of the synthesised adsorbents depends on the preparation conditions such as NaOH:fly-ash ratio and fusion temperature with the optimal conditions being at 1.2:1 weight ratio of Na:fly-ash at 250-350 degrees C. The synthesised materials exhibit much higher adsorption capacity than fly ash itself and natural zeolite. The adsorption isotherm can be fitted by Langmuir and Freundlich models while the two-site Langmuir model producing the best results. It was also found that the fly ash derived geopolymeric adsorbents show higher adsorption capacity for crystal violet than methylene blue and the adsorption temperature influences the adsorption capacity. Kinetic studies show that the adsorption process follows the pseudo second-order kinetics.

References

Jun 29, 2004·Journal of Colloid and Interface Science·Saeid Azizian

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Citations

Jun 29, 2013·Journal of Colloid and Interface Science·Yafei ZhaoYuri Lvov
Oct 9, 2015·Environmental Science and Pollution Research International·Kuang HeYongyou Hu
Feb 26, 2011·Journal of Hazardous Materials·Kamel Al-ZboonFalah Bani Hani
Feb 9, 2011·Journal of Hazardous Materials·Gülten AtunNihat Ayar
Nov 27, 2009·Journal of Colloid and Interface Science·Alok MittalV K Gupta
May 9, 2009·Journal of Colloid and Interface Science·Vinod K GuptaJyoti Mittal
Mar 14, 2007·Journal of Colloid and Interface Science·Antonio R CestariLuis E Almeida
Feb 20, 2007·Journal of Environmental Management·J X LinH Yang
Oct 13, 2006·Journal of Colloid and Interface Science·Orhan GeziciAhmet Ayar
May 4, 2016·Chemical Reviews·Afzal ShahUsman Ali Rana
Jun 20, 2016·Journal of Hazardous Materials·Hanna RunttiUlla Lassi
Feb 15, 2013·Chemical Society Reviews·Corine GérardinBénédicte Lebeau
Mar 10, 2017·Environmental Technology·Tero LuukkonenUlla Lassi
Aug 9, 2019·Environmental Technology·Quanzhi Tian, Keiko Sasaki
Nov 24, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Kayode Adesina AdegokeOlugbenga Solomon Bello
Aug 29, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Sandra SvilovićPetra Vučenović
Dec 2, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Hector R Guzmán-CarrilloAna Fernández-Jiménez
Sep 10, 2020·ACS Omega·Sukanta K MondalMonday U Okoronkwo
Feb 13, 2021·Journal of Environmental Quality·Elmira Khaksar NajafiMahyar Arabani

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