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th
The 4 Educational Science International Conference
Towards a Sustainable Future of Education: Preparing Teachers and Prospective Teachers for the Digital Age

SCIED-07

Activated Bledug Kuwu”S Clay As Adsorbent Potential For Synthetic Dye Adsorption;
Kinetic And Thermodynamic

Sri Lestari, Muflihah, Ratna Kusumawardani, Mukhamad Nurhadi, Yuniati Mangesa, Fathur
Insani Ridho, Robbiatul Adawiyah, Pristiningtyas Ambarwati, Siti Rahma
Department of Chemical Education, Universitas Mulawarman, East Kalimantan, Indonesia
nana_chemistry@yahoo.com

Abstract

Bledug Kuwu is one of the geological phenomena as a mud volcano that occurs in Kuwu,
Purwodadi, Grobogan, Central Java. An investigation of Bledug Kuwu clay as an adsorbent
for synthetic dyes has been carried out. The preparation of the adsorbent begins with washing
the clay with distilled water, followed by activation using a solution of hydrochloric acid
(1M). Activated Bledug Kuwu clay was characterized using FTIR spectroscopy, X-ray
diffraction, scanning electron microscopy, and nitrogen gas adsorption-desorption (BET).
Adsorption was carried out on the synthetic dye methylene blue with variations in contact
time, variations in initial concentration, and temperature variations. Variations in contact time
and initial concentration were used to determine the adsorption kinetics model. Temperature
variations are used to determine the value of the thermodynamic parameters of enthalpy (ΔH),
entropy (ΔS), and free energy (ΔG). The results of the investigation showed that the
adsorption capacity of activated Bledug Kuwu clay reached 99% in an adsorption time of 20
minutes. The adsorption process of methylene blue with activated Bledug Kuwu clay as
adsorbent was spontaneous and followed a pseudo second-order kinetic model.

Keywords: clay, Bledug Kuwu, adsorption, kinetics, thermodynamics.

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