Hydrothermal Preparation of Nanocrystalline TiO2 Powders Under Various Concentrations of the Solvent for Photocatalytic Reduction of Pentavalent and

Trivalent Arsenic

Astri Aldelina, Diana Rakhmawaty E., and Atiek Rostika Noviyantiastrialdelina22@gmail.com

Department of Chemistry, Faculty of Mathematics and Natural Sciences,Universitas Padjadjaran

Abstract Arsenic is one of WHO’s 10 chemicals of major public health concern. The greatest threat to public health from arsenic originates from contaminated groundwater. Two forms are common in groundwater: arsenite (AsO3

3−) and arsenate (AsO4

3−), referred to as arsenic(III) and arsenic(V). One of the most well-known method of arsenic remediation is adsorption. Titanium dioxide (TiO2) can be used as an absorbent to remove arsenic. Sorption capacity of different polymorph TiO2 depends on sorption site density, surface area, particle size, surface energy, crystallinity and crystalline structure, all these parameters depends on particle preparation technique. Many different preparation methods have been described in order to obtain high-performance TiO2 nanoparticles, including hydrothermal methods. This method is commonly used to grow large good-quality crystals and highly homogeneous nanoparticle. Various parameters had been studied in order to get the better product like temperature, experimental duration, pressure (percentage fill), pH, molar ratio of the starting materials, and solvent type. The preparation of TiO2 nanocrystal will be carried out using various concentration of acid and base solvents using hydrothermal method. Synthesized materials will be characterized and calculated using x-ray diffraction, SEM (Scanning Electron Microscope) and Brunauer-Emmett-Teller (BET) surface area theory respectively, whilst sorption data will be interpreted in terms of the Freundlich and Langmuir equations. This research is expected to obtain the optimal concentration of the solvents to produce high purity TiO2

crystals for photocatalytic purpose.

Keywords: hydrothermal method, nanocrystalline TiO2, photocatalyst TiO2, arsenic sorption

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