Study of atrazine adsorption kinetics by using an activated carbon synthesised from water hyacinth

Deetae, Pawinee; Wongpromrat, Patthranit

doi:10.1051/e3sconf/201911600015

Study of atrazine adsorption kinetics by using an activated carbon synthesised from water hyacinth

Author(s)

Deetae, Pawinee

Wongpromrat, Patthranit

Date Issued

September 24, 2019

Type

Conference Paper

DOI

10.1051/e3sconf/201911600015

Abstract

In this work, atrazine, one of the most widely used herbicides in Thailand, was removed from water by activated carbon synthesized from water hyacinth. Before adsorption, 3 types of activated carbons used as adsorbents were prepared by different chemical treatment methods; untreated activated carbon (AC), HCl-treated activated carbon (HCl-AC) and NaOH-treated activated carbon (NaOH-AC). After pyrolysis, NaOH-AC became ash, so it was not suitable for using as an adsorbent. Brunauer-Emmett-Teller (BET) and CHNS methods were used to characterised 2 other adsorbents and the results showed that HCl treatment could improve the surface area and carbon content. This led to the better performance of HCl-AC for removing atrazine from water comparing to AC confirming by the adsorption experiments. In addition, the adsorption kinetics of HCl-AC, the best adsorbent in this research, was investigated by fitting with 4 kinetics models. The results showed that pseudo-second-order was the best kinetics model describing that the atrazine adsorption of HCl-AC was limited by adsorption and 2 active sites of adsorbent were required for adsorbing 1 molecule of atrazine.

Citation

E3s Web of Conferences, 116, 2019