TiO2 Nanopartikülü ve TiO2/Aktif Çamur Sentezi ile Sulu Çözeltiden Cu (II) İyonlarının Adsorpsiyonu

Year 2020, , 86 - 98, 15.01.2020

Neşe Keklikcioğlu Çakmak , Gamze Topal Canbaz

https://doi.org/10.17714/gumusfenbil.514285

Cited By: 5

Abstract

Son
zamanlarda sulardan ağır metal giderim çalışmaları önem kazanmıştır. Bu amaçla bu çalışmada sulu çözeltiden Cu (II)
iyonlarının gideriminde kullanılmak üzere sol-jel yöntemi ile saf TiO₂ nanopartikülleri
ve TiO₂/aktif çamur bileşimi sentezlenmiştir. Sentezlenen
materyallerin karakterizasyon analizleri; X ışını kırınım analizi (XRD), UV-Vis
absorpsiyon spektroskopisi (UV-VIS), taramalı elektron mikroskobu (SEM), enerji
dağılım X-ışınları spektroskopisi (EDS) ve Fourier Dönüşümlü Kızılötesi
Spektroskopisi (FTIR) teknikleri kullanılarak gerçekleştirilmiştir. TiO₂ nanopartikülleri
ve TiO₂/aktif çamur bileşiminin Cu (II) giderim potansiyeli kesikli
sistemde incelenmiştir. 25^oC’de sentezlenen TiO₂/aktif
çamur bileşimi bakır gideriminde en iyi adsorban olarak belirlenmiştir.
Adsorpsiyon sisteminin optimum koşullarını belirlemek amacı ile pH, temas
süresi, başlangıç metal iyon derişim gibi parametrelerin etkisi incelenmiştir.
Sistemin Langmuir ve Freundlich adsorpsiyon izotermlerine uygunluğu
araştırılmış, Langmuir izotermine daha uygun olduğu belirlenmiş ve sistemin
maksimum adsorpsiyon kapasitesi 47.61 mg/g olarak hesaplanmıştır. En uygun
kinetik modeli belirlemek için yapılan çalışmalarda ise adsorpsiyon prosesinin
yalancı ikinci dereceden kinetik model ile uyum sağladığı gözlenmiştir. Gibbs
serbest enerji ve entalpi değerleri ise sistemin kendiliğinden gerçekleştiğini
ve ekzotermik olduğunu göstermiştir.

Keywords

Adsorpsiyon, Ağır metal, Sol-jel, TiO2 nanopartikül

Removal of Cu(II) ions from Aqueous Solution by Synthesis of TiO2 nanoparticles and TiO2/Activated Sludge

Abstract

In recent years, the removal of heavy metals from
water has gained importance. For this purpose, pure TiO2 nanoparticles
and TiO2/activated sludge composition were synthesized by sol-gel
method for removal of Cu (II) heavy metal in this work. Characterization analyzes of the synthesized materials were performed
using X-ray diffraction (XRD), Ultraviolet–visible spectroscopy
(UV–VIS) spectrometer, scanning electron
microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Fourier
Transform Infrared Spectroscopy (FTIR) techniques. The adsorption potential of
nanosized TiO2 and TiO2/activated sludge composition for
removal of Cu  (II) was investigated in a
batch system. TiO2/sewage sludge at 25 oC was found to be
the best adsorbent for copper removal. In order to determine the optimum
conditions of the adsorption system, the effects of the parameters such as the
effect of pH, contact time, initial metal ion concentrations were investigated.
The suitability of the system for Langmuir and Freundlich adsorption isotherms
was investigated, and it was determined that Langmuir isotherm was more
suitable and the maximum adsorption capacity of the system was calculated as
47.61 mg/g. In the studies conducted to determine the most suitable kinetic
model, it was observed that the adsorption process conformed to the
pseudo-second kinetic model. Gibbs free energy and enthalpy values ​​show that
the system is spontaneous and exothermic.

Keywords

Adsorption, Heavy metal, Sol-gel, TiO2 nanoparticle

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