Hidrotermal sentez ve sol-jel yöntemleri ile farklı morfolojilerde CdS partikül üretimi ve atık su uygulamalarında kullanımları

Year 2018, , 888 - 897, 01.06.2018

Cansel Tuncer

https://doi.org/10.16984/saufenbilder.321585

Abstract

 Bu
çalışmada, iki farklı metot kullanılarak CdS nanopartikülleri farklı boyutlarda
ve morfolojilerde sentezlenmiştir. İlk olarak, hidrotermal sentez yöntemi ile
hem karnabahar tipi CdS mikrokürelerin hem de CdS nanoçiçek türü mikroyapıların
sentezleri teflon hazneli çelik reaktörlerde gerçekleştirilmiştir. Karnabahar
tipi CdS mikrokürelerin sentezinde polietilen glikol ve tiyoasetamid
kullanılırken, nanoçiçek CdS mikroyapıların sentezlerinde sülfür kaynağı olarak
tiyoüre kullanılmıştır. Diğer bir yöntem olan sol-jel metodu ile de çapları
yaklaşık 200 nm olan küresel CdS ve Ag/CdS nanopartiküller hazırlanmıştır. Bu
metotta, polietilen glikol su içerisindeki çözünürlüğü ve yüksek viskozitesi
sayesinde nanokristallerin büyümelerinin kontrollerini sağlayarak stabilizör
olarak kullanılmıştır. Her iki metot ile de başarılı bir şekilde farklı
boyutlarda ve şekillerde CdS mikro- ve nanoyapılar hazırlanmıştır. Bu
partiküller, metil oranj (MO) boyasının fotodegradasyonunda kullanılmıştır.
Ortaya çıkan sonuçlar, sentezlenen CdS partiküllerinin MO boyasının
fotodegradasyona uğratarak atık su uygulamalarında potansiyel kullanımları
olabileceğini göstermektedir. Floresans spektroskopi ölçümleri ile CdS yapılarının
enerji band aralıkları belirlenmiştir. X-ışını kırınım yöntemi (XRD), geçirimli
elektron mikroskobu (TEM) ve taramalı elektron mikroskobu (SEM) cihazları
yapıların karakterizasyonunda kullanılmıştır. Ayrıca MO boyasının atık sulardan
giderim çalışmalarında UV-vis spektrofotometresi kullanılmış olup, CdS
partiküllerinin boya degradasyon yüzdesi ve adsorpsiyon kapasitesi (qe)
değerleri hesaplanmıştır. 

Keywords

CdS partiküller, hidrotermal sentez, sol-jel metodu, fotodegradasyon

Hydrothermal synthesis and sol-gel methods for CdS particle production in different morphologies and their use in wastewater applications

Abstract

In this study, CdS
nanoparticles were synthesized in different sizes and morphologies using two
different methods. First, the synthesis of both cauliflower-type CdS microspheres
and CdS nanoflower-type microstructures by hydrothermal synthesis was carried
out in a steel reactors with teflon chamber. While polyethylene glycol and
thioacetamide were used in the synthesis of cauliflower-type CdS microspheres,
thiourea was used as a sulfur source in the synthesis of nanoflower CdS microstructures.
Spherical CdS and Ag/CdS nanoparticles having a diameter of about 200 nm were
prepared by the sol-gel method. In this method, polyethylene glycol is used as
a stabilizer by providing the control of the growth of nanocrystals due to its
high solubility in water and high viscosity. Using both methods, CdS micro- and
nanostructures were successfully prepared in different sizes and shapes. These
particles were used for photodegradation of methyl orange (MO) dye. The results
show that the CdS particles synthesized may have potential uses in waste water
applications by photodegrading the MO dye. Energy band gaps of CdS structures
were determined by fluorescence spectroscopy measurements. X-ray diffraction
(XRD), transmission electron microscopy (TEM) and scanning electron microscopy
(SEM) devices have been used to characterize structures. In addition, UV-vis
spectrophotometer was used for removal of MO dye from waste water and the
percentage of dye degradation and adsorption capacity (qe) of CdS particles
were calculated.

Keywords

CdS particles, hydrothermal synthesis, sol-gel method, photodegradation

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