Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 20, Issue 2, 2018; Page No.(451-457)

A SUSTAINABLE APPROACH OF NITRATE ADSORPTION FROM WATER USING PALM OIL AGRICULTURAL WASTE

M.T. BASHIR, S. ALI. AZNI AND R. HARUN

Abstract

Nitrate in drinking water poses serious health issues in many countries. In this study, a novel low-cost bioadsorbent was prepared by chemically modifying palm kernel shells. Nitrate removal by the adsorbent was studied for a range of pH, nitrate concentrations, and temperatures. Based on goodness-off it to observe adsorption data, the Red lich-Peterson isotherm model provided a better description of nitrate adsorption than did the Langmuir and Freund lich isotherm model. The maximum adsorption capacity observed was 54.18 mg/g. A pseudo-second order model was superior to a pseudo-first order model in describing the kinetics of the adsorption reaction, suggesting the dominance of chemisorption. The adsorbent can effectively remove nitrate across a wide range of pH (4-8) and temperature (20-40oC). Scanning Electron Microscope, Electron Dispersive X-Ray and Fourier Transform Infrared (FT-IR) provided evidence of the chemical modifications made to the palm kernel shell and the subsequent adsorption of nitrate.

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