Preparation and Characterisation of Biochar from Hazelnut Shell and Its Adsorption Properties for Methylene Blue Dye

Year 2018, Volume: 21 Issue: 4, 765 - 776, 01.12.2018

Nihan Kaya , Zeynep Yıldız Selim Ceylan

https://doi.org/10.2339/politeknik.386963

Cited By: 10

Abstract

One of the major
pollutants in water resources are organic dyes that are widely used by
different industries. Methylene blue (MB) is one of them which is quite harmful
for aquatic life. This pollutant must be removed with proper methods.
Adsorption is one of the most popular methods because of its high purification
yield and known as a cost effective process if the sorbent is inexpensive. In
this study, biochar which is used as an adsorbent has been produced from
hazelnut shells used as the raw material. Chemical, thermal and surface
characteristics of raw hazelnut shell were investigated by FT-IR, TG/DTG, SEM
and elemental analysis. Biochar characteristics were determined by FT-IR, BET
and SEM analysis. The effect of different adsorption parameters such as pH,
initial dye concentration, contact time, adsorbent dosage and temperature on
the adsorption of MB onto hazelnut shell char were examined in batch
experiments. The equilibrium of adsorption was modeled using Langmuir and
Freundlich isotherm models. The maximum adsorption yield of MB was found to be
83% at pH 4.0, adsorbent dosage of 4 g/L, contact time of 300 min., initial dye
concentration of 15 mg/L and temperature of 45 ^oC. In addition, the
Freundlich isotherm was found to be the best fitting isotherm model for the
adsorption process. The pseudo-first-order and pseudo-second-order kinetic
models were applied to the experimental data and thermodynamic parameters such
as Gibbs free energy, enthalpy and entropy were determined. 

Keywords

Adsorption, methylene blue, hazelnut shell, carbonization, biochar

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