Preparation of Microcapsules with CdSe Nanocrystals and The Use of Microcapsules for Cr (VI) Removal From Water

Year 2018, Volume: 20 Issue: 60, 711 - 724, 15.09.2018

Ayşe Altunyaldız Canan Başlak , Gülşin Arslan

Abstract

In this
work, CdSe nanocrystals based on heavy metals are synthesized with
organometallic precursors at high temperature and it is aimed to use a new
nanocomposite microcapsule adsorbent material for Cr (VI) removal from water by
preparation of chitosan-doped microcapsules. Structural analyzes of synthesized
CdSe nanocrystals were performed by transmission electron microscopy (TEM) and X-ray diffraction (XRD) measurements.
The adsorption capacities of the microcapsules, initial metal ion
concentrations, pH, time and adsorption effects of adsorbent dose were
investigated in order to remove Cr (VI) ion from aqueous solutions according to
the Batch method. In Cr (VI) metal-sorption processes, equilibrium sorption
isotherm curves were drawn by using Freundlich and Langmuir sorption isotherms
and the adsorption parameters were calculated from these isotherms. 

Keywords

CdSe nanocrystal 1, Cr(VI) sorption 2, Quantum dot 3, Microcapsule 4

CdSe Nanokristalleri ile Mikrokapsül Hazırlama ve Cr(VI) Gideriminde Kullanılması

Abstract

Bu
çalışmada, yüksek sıcaklıkta organometalik başlatıcılar ile ağır metal temelli
CdSe nanokristalleri sentezlenmiş ve kitosan katkılı mikrokapsüllerin
hazırlanması ile yeni bir nanokompozit mikrokapsül adsorban maddenin sulardan
Cr(VI) gideriminde kullanılması amaçlanmıştır. Sentezlenen CdSe
nanokristallerinin geçirimli elektron mikroskobu tekniği (TEM) ve X ışınları
saçılım (XRD) ölçümleri ile yapısal analizleri yapılmıştır. Mikrokapsüllere ait
adsorpsiyon kapasiteleri, başlangıç metal iyonu konsantrasyonları, pH, zaman ve
adsorban dozunun adsorpsiyona etkileri Batch metoduna göre Cr(VI) iyonunun sulu
çözeltilerden uzaklaştırılması araştırılmıştır. Cr(VI) metal-sorpsiyon
işlemlerinde denge sorpsiyon izoterm eğrileri Freundlich ve Langmuir sorpsiyon
izotermleri kullanılarak çizilmiş ve bu izotermlerden adsorpsiyon parametreleri
hesaplanmıştır.

Keywords

CdSe nanokristal 1, Cr(VI) sorpsiyon 2, Kuantum noktacık yapı 3, Mikrokapsül 4

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