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Ammonium  NH 4 + is a pollutant that can be harmful to the water environment. The purpose of this study is to access  NH 4 + removal capacity from water by coffee husk-derived biochar. The properties of biochar prepared at different temperatures (300, 450, and 600°C) were determined including TOC, and  pH ,  pH pzc , functional groups of H+/OH−, cation-exchange capacity (CEC), and the characteristics of groups of organic matter (FT-IR spectrum) were identified and evaluated. The trend of  NH 4 + adsorption equilibrium and kinetics of biochar have been studied. The experimental design of adsorption equilibrium was carried out by exposing biochar to a  NH 4 + solution at different concentrations, ranging from 0 to 50 mg  NH 4 + / L for 12 hours. Kinetic surveys were carried out when biochar was exposed to a solution containing 8.3 mg  NH 4 + / L for a varying length of time. The results showed that Langmuir and Freundlich models and the pseudo-second-order kinetic model are suitable to explain the  NH 4 + adsorption equilibrium and kinetics on the biochar forms derived from coffee husk. Biochar derived from coffee husk prepared at lower pyrolysis temperature has a higher adsorption capacity. The results suggest that the biochar could be used as an adsorbent ammonium from water.

international journal of agronomy

Evaluation of <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <msubsup> <mrow> <mtext>NH</mtext> </mrow> <mn>4</mn> <mo>+</mo> </msubsup> </math> Adsorption Capacity in Water of Coffee Husk-Derived Biochar at Different Pyrolysis Temperatures

Evaluation of NH 4 + Adsorption Capacity in Water of Coffee Husk-Derived Biochar at Different Pyrolysis Temperatures

Evaluation of ${NH}_{4}^{+}$ Adsorption Capacity in Water of Coffee Husk-Derived Biochar at Different Pyrolysis Temperatures