Solvothermal Synthesis of Anatase TiO2 for the Detoxification of Methyl Orange Dye with Improved Photodegradation Efficiency

Rekha B. Rajput,

Shweta N. Jamble

Rohidas B. Kale*Email

Department of Physics, The Institute of Science, Madam Cama Road, Mumbai, India

Abstract

TiO2 nanomaterials are one of the most significant nanomaterials among the various metal oxide semiconductors family. The TiO2 nanomaterials exhibit good chemical and biological stability, nontoxicity, high degradation efficiency and good permeability. Hence TiO2 nanomaterials are used for the photodegradation of organic pollutants, toxic dyes and other forms of environmental contaminants. In this work, the anatase TiO2 nanomaterials were efficiently synthesized via a solvothermal method, with crystallite sizes ranging from 6.8-7.1 nm. The morphological observations revealed that various shapes and sizes of microparticles were formed by the agglomeration of nanoparticles. The energy-dispersive X-ray analysis confirmed that the titanium-oxygen stoichiometric ratio was approximately 1:2. The energy band gap of TiO2 nanomaterials was in the range of 3.02-3.12 eV. The photoluminescence study showed that anatase TiO2 nanomaterial (T2) is ascribed to the self-trapped excitons, surface states and oxygen vacancies. The T2 sample has shown red-shifted with a high surface area (183.17 m2/g) and large pore size (4.58 nm), which helps to achieve photocatalytic degradation of methyl orange up to 90 % within 30 min of mercury light irradiation. The scavenger test indicated that h+ radicals are important reactive species in the photodegradation process.

Solvothermal Synthesis of Anatase TiO2 for the Detoxification of Methyl Orange Dye with Improved Photodegradation Efficiency