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

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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