Synthesis of nano alumina for defluoridation of drinking water

Autor: Suja George, Prakash Kumar Singh, Virendra Kumar Saharan, Parimala Shivaprasad
Rok vydání: 2018
Předmět:
Zdroj: Nano-Structures & Nano-Objects. 13:109-120
ISSN: 2352-507X
DOI: 10.1016/j.nanoso.2018.01.001
Popis: In the present study, nano alumina was synthesized via sol–gel technique with and without a surfactant as a template. The synthesized adsorbents were first characterized to determine the morphology and surface composition. TEM images showed the formation of nano lathes and nano rods in the size range of 50–100 nm. The sharp, high intensity peaks obtained from XRD analysis confirmed the formation of highly crystalline alumina. Pure and modified nano alumina were then tested for defluoridation of water under different experimental conditions such as agitation time, solute concentration and pH. Defluoridation using pure nano alumina was achieved in 120 min using an adsorbent dose of 10 mg/L in a solution of pH 7. With modified nano alumina, defluoridation was achieved within 30 min with an adsorbent dose of 8mg/L at near neutral solution pH. From Langmuir adsorption isotherm, the maximum solute capacity was found to be 2.55 mg/g and 5.66 mg/g for pure and modified nano alumina respectively. The kinetics of the process was explained using both pseudo-second order and intra-particle diffusion kinetics. The water quality post treatment adhered to the norms of drinking water thus indicating the feasibility of using nano alumina for defluoridation of drinking water. To the best of the authors’ knowledge, the study has demonstrated successful water defluoridation using synthesized nano alumina in the crystalline phase hence emphasizing its role in drinking water defluoridation in the future.
Databáze: OpenAIRE
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