Biomass Carbon Aerogel Modified by N235 and KH560 for Removal of Iodide from Oilfield Brine

Abstract

Owing to porous structure, stable chemical properties, low cost and available raw material, biomass carbon aerogel is a promising adsorbent framework material. Herein, a pomelo peel-based carbon aerogel was prepared by hydrothermal-freeze drying-high temperature carbonization method and modified with Tri-n-ocylamine (N235) and γ-Glycidyloxypropyltrimethoxysilane (KH560) via impregnation process. The as-prepared adsorbents exhibit superior adsorption performance for iodide in simulated and oilfield brines, and the highest adsorption amount of iodide in oilfield brine can reach 0.58 mmol/g. It is also demonstrated by adsorption kinetics and isotherms that iodide is adsorbed through chemical adsorption. Protonation of tertiary amide group in N235 and epoxy group in KH560 may be the main reason for the highly selective adsorption of iodide.

Keywords

biomass carbon aerogel / oilfield brine / iodide / adsorption

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