Removal of Dyes from Wastewater by Adsorption Using Modified Boron Enrichment Waste: Thermodynamic Criteria

Year 2017, Volume: 1 Issue: 1, 12 - 18, 01.08.2017

Muhammed Öden Sezen Küçükçongar

Abstract

In this study,
Methylene Blue (MB) and Malachite Green (MG) removal from synthetic wastewaters
using modified boron enrichment waste by adsorption process were aimed. Boron
enrichment waste was modified with acid and ultrasound together. The boron enrichment process waste
could be used as an effective adsorbent due to its constituents including
ulexite, calcite, dolomite, zeolite and some clays. About 84% MB and 80% MG removal were obtained by modified boron
enrichment waste (MBEW) at optimum equilibrium conditions (Contact time: 20-10
min., adsorbent dose: 625-375 mg/L, pH: 11-10, shaking speed: 200 rpm and
temperature: 25⁰C) respectively. Besides, the thermodynamic parameters, such as ΔG^◦, ΔH^◦ and ΔS^◦ were also calculated.
Thermodynamic
(negative ∆G values) study indicates that the adsorption of dye is feasible,
and spontaneous in nature. Thermodynamic study
demonstrates the spontaneous and endothermic nature of sorption process due to
negative values of free energy change and positive value of enthalpy change,
respectively. All the
studied results showed that the modified enrichment waste could be used as
effective adsorption material for the removal of methylene
blue and malachite
green from aqueous solutions.

Keywords

Dyes, Boron Ore, Boron Enrichment Waste, Adsorption, Colour Removal

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