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The Synthesis of silica nanoparticles from Vietnamese rice husk - Application for adsorption of heavy metals in industrial wastewater

Đào Thi Băng Tâm , Nguyễn Trung Độ, Lưu Kiến Quốc, Hà Thúc Chí Nhân
Science and Technology Development Journal - Natural Sciences , Volume 4, pp 789-799; doi:10.32508/stdjns.v4i4.915

Abstract: Heavy metals are known to be toxic, even at low content (ppm), for living organisms[1,2]. The presence of heavy metals and other pollutants in water continues to be a major concern and the removal of such contaminants is considered as an important solution for environmental remediation[3,4]. In this paper, we study the ability adsorption of Pb2+ and Cd2+ heavy ionic metal on silica nanomaterials which was extracted and purified from Vietnamese rice husk. The structure of the materials was investigated by X-ray diffraction (XRD) and FT-IR spectroscopy. By Adsorption Atomic Spectroscopy (AAS) analysis, the results have demonstrated the time taken for attaining equilibrium adsorption is about 1.5 hours for both cases, and the adsorption capacity of Pb2+ and Cd2+ on silica are 21 and 24 mg/L, respectively.
Keywords: silica / Adsorption / Heavy metals / Rice / structure / contaminants / Vietnamese / husk / Pb2

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