Sains Malaysiana 49(12)(2020): 2881-2890

http://dx.doi.org/10.17576/jsm-2020-4912-01

Adsorption Isotherm of Densed Monoclinic Tungsten Trioxide Nanoparticles

(Penjerapan Isoterma oleh Zarah Nano Monoklin Tungsten Trioksida Padat)

ASEP BAYU DANI NANDIYANTO¹*, RISTI RAGADHITA¹ & JUMRIL YUNAS²

¹Departemen Kimia, Universitas Pendidikan Indonesia, Bandung, Indonesia

²Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 10 April 2020/Diterima: 29 April 2020

ABSTRACT

This study evaluated isotherm adsorption of densed monoclinic tungsten trioxide (WO₃) nanoparticles. To ensure the prepared particles were dense, experiments were conducted by combining ball-milling process and calcination of ammonium pentahydrate powder, in which all experiments were done with no additional chemicals or solvents. The adsorption process was carried out by adsorbing curcumin (as a model of adsorbate) in the batch process at ambient temperature and constant pH and the results was compared to several isotherm models: Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models. To support the analysis, several characterizations were conducted: scanning electron microscope, X-ray diffraction and Fourier transform infrared. Experimental results showed that during the adsorption process, physical and chemical interactions occur simultaneously. The physical interactions happen when the adsorbate molecules attach directly to the surface of the adsorbent, forming monolayer adsorption. The chemical interaction is for the interaction between adsorbate molecules and occurs on above the formed main monolayer adsorption. The results were also completed with the proposal mechanism in the adsorption process. This study is important for supporting the fundamental researches in the photochemical reaction using WO₃ catalyst.

Keywords: Adsorption isotherm; curcumin; education; monolayer interaction; tungsten trioxide

ABSTRAK

Kajian ini bertujuan untuk menilai penjerapan zarah nano tungsten trioksida (WO₃). Zarah nano WO₃ disediakan oleh proses pengisar bebola dan pengkalsinan amonium pentahidrat, dengan semua proses dilakukan tanpa ada bahan kimia atau pelarut. Proses penjerapan dilakukan dengan menjerap kurkumin (sebagai model penyerap) dalam proses kelompok pada suhu ambien dan pH malar dan hasilnya dibandingkan dengan beberapa model isoterma: model Langmuir, Freundlich, Temkin dan Dubinin-Radushkevich. Untuk menyokong analisis, beberapa pengkhususan telah dijalankan: pengimbasan mikroskop elektron, sinar-x difraksi dan inframerah transformasi Fourier. Hasil uji kaji menunjukkan bahawa semasa proses penjerapan, interaksi fizikal dan kimia berlaku secara serentak. Interaksi fizikal berlaku apabila molekul adsorbat melekat terus ke permukaan penjerap, membentuk penjerapan ekalapis. Interaksi kimia adalah untuk interaksi antara molekul adsorbat pada bagian atas penjerapan ekalapis utama. Untuk menyokong analisis, hasilnya dilengkapkan dengan mekanisme cadangan dalam proses penjerapan. Kajian ini adalah penting untuk menyokong penyelidikan asas dalam tindak balas fotokimia menggunakan pemangkin WO₃. 

Kata kunci: Interaksi ekalapis; isoterma penjerapan; kurkumin; pendidikan; tungsten trioksida

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*Pengarang untuk surat-menyurat; email: nandiyanto@upi.ed