Page 80 - Abstract book - TJSSF-2020

Thailand – Japan Student Science Fair 2020 (TJ-SSF 2020)
“Seeding Innovations through Fostering Thailand – Japan Youth Friendship”

Comparison of phosphate removal efficiency from wastewater using
modified kaolin prepared from reflux and microwave methods

Jitsupa Intawong , Tudpicha Keawphraserdkul
1
1
Advisors: Piyamas Charoenchai , Wipharat Chuachuad Chaiyasith
1
2

Princess Chulabhorn Science High School Phitsanulok
1
Naresuan University
2

Abstract
The main objective of this research is to study the effectiveness of kaolin which was improved its
surface properties through the reflux and microwave methods using hydrochloric acid at different
concentrations and reaction time in order to use for the development of kaolin as an adsorbent material
for wastewater treatment and to reduce the pollution in the environment. Initially, using the reflux and
3 hours, with the addition of
hydrochloric acid at concentrations of 1, 1.5 and 2 M. To thoroughly determine the effectiveness of the
concentrations, different heating times were examined, and the time at 45, 60, 90 minutes were studied.
In order to determine the adsorption capacity in synthetic wastewater, the ascorbic acid was applied.
The results showed that hydrochloric acid concentrations and the change in the incubation time
increased the efficiency of kaolin and its ability to adsorb phosphate ion. By applying the microwave
method at concentration 2 M of HCl, it was observed that the incubation time of 90 minutes has the
highest adsorption capacity of phosphate (89.37%) and it is higher than the modified kaolin by reflux
method. From the physical characteristics of kaolin, it was observed that kaolin was brittle, contained
small pores and had a rough texture. In addition, by using the reflux and microwave methods on kaolin,
it also improved its efficiency to adsorb phosphate into 6 hours which the microwave method can adsorb
up to 99.41% of phosphate. In addition, kaolin was also applied to the general wastewater treatment. It
was found that the modified kaolin by microwave method can adsorb up to 66.86% with a good result
for using as an adsorbent material.

Keywords : Kaolin, Efficiency, Phosphate, Wastewater, Environment

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