Efficient Lead Removal from Aqueous Solution Using Chitosan-Vermiculite Composite: Equilibrium, Kinetic and Thermodynamic Studies

Year 2020, Volume: 8 Issue: 1, 15 - 21, 28.01.2020

Zeynep Mine Şenol

https://doi.org/10.21541/apjes.531737

Cited By: 3

Abstract

In
this study, a cost effective, naturally effective adsorbent, chitosan (Ch) -
vermiculite (V) composite material for the efficient removal of lead ions from
aqueous solution was synthesized. The Ch-V composite was characterized by FT-IR
SEM-EDX and PZC analyzes. The adsorbent properties of Ch-V composite for Pb^2​​+
were evaluated in terms of pH, concentration, kinetic (time), thermodynamic
(temperature) and recovery of adsorption. The experimental data obtained are
derived from the relevant parameters applied to the Radushkevich isotherm
models of Langmiur, Freundlich and Dubinin. The maximum adsorption capacity was
found to be 0.154 mol kg^-1 and the K_L value was 3441 Lmol^-1.
Freudlich model is a measure of adsorption capacity X_F 10.3 and β
surface heterogeneity is 0.537. The results showed that the experimental data
fit better with the Freundlich model. The adsorption energy of Dubin
Radushkevich model was found to be 9.7 kJ mol^-1, which indicates
that the adsorption process is chemical. Adsorption kinetics were found to
adapt to the pseudo-second model. The olduğun ΔH0 value of adsorption was found
to be 5.09 kjmol-1, indicating that the adsorption is endothermic. ΔS⁰
was found as 69.7 Jmol^-1K^-1 which indicates an increase
in the randomness of the biosorbent/solution interface during the adsorption
process. Gibbs free energy exchange for 298.15 ⁰C was found to be
-15.7 kJ mol^-1, indicating that adsorption was spontaneous. The
recovery studies showed that the Ch-V composite had good adsorption/desorption
performance.

Keywords

Chitosan, Vermiculite, Composite, Adsorption, Lead

Kitosan-Vermikülit Kompoziti Kullanılarak Sulu Çözeltiden Etkin Kurşun Giderimi: Denge, Kinetik ve Termodinamik Çalışmalar

Abstract

Bu çalışmada, sulu çözeltiden kurşun iyonlarının
etkin giderimi için düşük maliyetli, doğal etkin bir adsorban, kitosan (Ch) –
vermikülit (V) kompozit materyali sentezlenmiştir. Ch-V kompoziti FT-IR SEM-EDX
ve PZC analizleri ile karakterize edilmiştir. Pb²⁺ için Ch-V
kompozitinin adsorban özellikleri adsorpsiyonun pH, derişim, kinetik (zaman),
termodinamik (sıcaklık) ve geri kazanım açısından değerlendirilmiştir. Elde
edilen deneysel veriler Langmiur, Freundlich ve Dubinin Radushkevich izoterm
modellerine uygulanmış ilgili parametreler türetilmiştir. Langmiur eiştliğinden
maksimum adsorpsiyon
kapasitesi 0.154 molkg^-1 ve K_L değeri ise 3441 Lmol^-1
olarak bulunmuştur. Freudlich modelinden adsorpsiyon kapasitesinin bir ölçüsü
olan X_F 10.3 ve β yüzey heterojenliği ise 0.537 bulunmuştur.
Sonuçlar deneysel verilerin Freundlich modeline daha iyi uyum sağladığını
ortaya koymuştur. Dubinin Radushkevich modelinden adsorpsiyon
enerjisi 9.7 kJ mol^-1 olarak bulunmuştur ki bu durum adsorpsiyon
sürecinin kimyasal olduğunu ifade etmektedir. Adsorpsiyon kinetiğinin yalancı
ikinci derece modele uyum sağladığı görülmüştür. Adsorpsiyonun termodinamik
değerlendirilmesinden ΔH⁰ değeri 5.09 kjmol^-1 bulunmuştur
ki bu durum adsorpsiyonun endotermik olduğunu işaret eder. ΔS⁰ ise
69.7 Jmol^-1K^-1 olarak bulunmuştur ki bu durum adsorpsiyon
sürecinde biyosorbent/çözelti arayüzündeki rastgelelikte bir artma olduğunu
gösterir. 298.15 ⁰C için Gibbs serbest enerji değişimi, -15.7 kJ mol^-1
olarak bulunmuştur ve bu durum adsorpsiyonun kendiliğinden olduğunu
göstermiştir. Geri kazanım çalışmaları Ch-V kompozitinin iyi bir
adsorpsiyon/desorpsiyon performansına sahip olduğunu göstermiştir.

Keywords

Kitosan, vermikülit, kompozit, adsorpsiyon, kurşun

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