Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Preparation of Porous Silica Nanoparticles by Chemical Etching for Removal of Paraquat from Aqueous Solution

Kanokwan Darasoon, Supawitch Hoijang, Tanapong Kunakham, Sorapong Janhom, Supon Ananta, Gyu Leem and Laongnuan Srisombat
* Author for corresponding; e-mail address: laongnuan.sri@cmu.ac.th
Volume: Vol.50 No.1 (January 2023)
Research Article
DOI: https://doi.org/10.12982/CMJS.2023.009
Received: 20 September 2022, Revised: 4 January 2023, Accepted: 5 January 2023, Published: -

Citation: Darasoon K., Hoijang S., Kunakham T., Janhom S., Ananta S., Leem G., et al., Preparation of porous silica nanoparticles by chemical etching for removal of paraquat from aqueous solution. Chiang Mai Journal of Science, 2023; 50(1): e2023009. DOI 10.12982/CMJS.2023.009.

Abstract

 In this study, solid silica nanoparticles (sSiO2 NPs) were chemically etched using sodium hydroxide solution as an etchant to synthesize porous silica nanoparticles (pSiO2 NPs). Etchant dosage and etching time were optimized to obtain the optimum etching condition providing the effective removal of paraquat (PQ). High removal efficiency of PQ by the synthesized pSiO2 NPs was obtained over 90% using 11.1 mL of 1.25 M NaOH and 12 h for the etching process. SEM and TEM images showed that the porosity of pSiO2 NPs increased with increase of the etchant dosage and etching time. The increment of porosity of pSiO2 NPs enhanced the PQ removal efficiency. FTIR result indicated that the characteristic functionalities of silica remain after the etching process. After optimum condition of etching obtained, the adsorption behavior of PQ was investigated. Several key factors influencing the adsorption efficiency, i.e., initial solution pH, initial concentration, and adsorption time were optimized. The maximum removal efficiency of PQ (~98%) by the pSiO2 nanoadsorbent was obtained using 100 mg L-1 of PQ solution at pH ~7 within 5 minutes. The maximum adsorption capacity (qmax) of the pSiO2 NPs for the PQ removal was 65.7 mg g-1. The pSiO2 nanoadsorbent is effective adsorbent for the PQ removal due to the development of a facile synthetic method for adsorbent preparation, rapid adsorption process, and comparable qmax value with other PQ adsorbents.

Keywords: adsorption, porous silica nanoparticles, chemical etching, paraquat removal

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