Answered: Biochar is believed to be a good…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

Biochar is believed to be a good absorbent for various contaminants. In an isotherm experiment, a series of 20 mL polyethylene centrifuge tubes containing nutrient (NH₄Cl) solutions (Volume: 12 mL, pH adjusted to 7.0 ± 0.2) with NH₄⁺-N concentrations of 60, 120, 180, 240, or 480 mg/L and 200 mg of switchgrass biochar samples (sealed with Telflon-line screw caps) were agitated on a wrist action shaker for 24 h (pre-examined to be sufficient) to reach equilibrium. The concentrations of NH₄⁺-N at equilibrium are summarized in the table below.

Initial NH₄⁺-N concentration (mg/L)	NH₄⁺-N concentration at equilibrium (mg/L)
60	54
120	110
180	165
240	228
480	471

Please use the Freundlich isotherm model to estimate the adsorption constant values of switchgrass biochar.

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