Adsorptive Removal of Iron Using SiO2 Nanoparticles Extracted from Rice Husk Ash

Tan Tai Nguyen; Hoa Thai Ma; Pramod Avti; Mohammed J K Bashir; Choon Aun Ng; Ling Yong Wong; Hieng Kiat Jun; Quang Minh Ngo; Ngoc Quyen Tran

doi:10.1155/2019/6210240

Adsorptive Removal of Iron Using SiO₂ Nanoparticles Extracted from Rice Husk Ash

J Anal Methods Chem. 2019 Jun 2:2019:6210240. doi: 10.1155/2019/6210240. eCollection 2019.

Authors

Tan Tai Nguyen¹, Hoa Thai Ma², Pramod Avti³, Mohammed J K Bashir⁴, Choon Aun Ng⁴, Ling Yong Wong⁴, Hieng Kiat Jun⁵, Quang Minh Ngo^{6

7

8}, Ngoc Quyen Tran^{9

10}

Affiliations

¹ Department of Materials Science, School of Applied Chemistry, Tra Vinh University, Tra Vinh City 87000, Vietnam.
² Department of Active Polymers and Nanomaterials Applications, School of Applied Chemistry, Tra Vinh University, Tra Vinh City 87000, Vietnam.
³ Department of Biophysics, Postgraduate Institute of Medical Education and Research (PGIMER), Sector-12, Chandigarh 160012, India.
⁴ Faculty of Engineering and Green Technology (FEGT), Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia.
⁵ Department of Mechanical and Material Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Sungai Long Campus, Bandar Sg. Long, 43000 Kajang, Malaysia.
⁶ Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
⁷ Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
⁸ University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
⁹ Graduate University of Science and Technology, Vietnam Academy of Science and Technology, HCM City 70000, Vietnam.
¹⁰ Institute of Applied Materials Science, Vietnam Academy of Science and Technology, HCM City 70000, Vietnam.

Abstract

In this work, SiO₂ nanoparticles were prepared by the sol-gel method after sodium silicate was extracted from rice husk ash (RHA) under various experimental conditions such as types of acids, NaOH concentration, dissolved time, and temperature and used for removal of Fe²⁺ ions from aqueous solutions. The extracted SiO₂ was morphologically and chemically characterized and showed a surface area of 78 m²/g and uniform pores of 2.71 nm, offering high adsorption capacity for Fe²⁺ ions. The influence of pH, contact time, and amount of adsorbent was studied in order to establish the best conditions for the Fe²⁺ adsorption and removal. Furthermore, the adsorption data were fitted with an exponential shape curve for all the three variable parameters that affect the adsorption process. The best results were obtained for pH 5, 20 min contact time, and 0.5 g adsorbent dose. The loading adsorption capacity was 9 mg of Fe²⁺ ions/g SiO₂ in the concentration range 0.1-1.0 mgL^-1. In addition, the synthesized SiO₂ with the size of around 50 nm can be used for specific heavy metal removal and drug delivery, after modification of the SiO₂ surface with various functional groups.