Investigation of the Effects of Temperature, Dose, Size and Contact Time on Nickel and Cadmium Removal from Water with Bentonite

Year 2024, Volume: 24 Issue: 05, 1198 - 1205

Özlem Güllü , Nahide Feyza Çetin

Abstract

Heavy metals cause water quality deterioration and pollution due to their accumulation and difficulty removing them from aquatic environments. Nickel and cadmium are among these heavy metals. This study used bentonite from the Eskişehir region as adsorbent to remove nickel and cadmium from synthetically prepared water. To ensure maximum adsorption of nickel and cadmium on bentonite clay, parameters such as pH value, adsorbent dose, mixing time, speed, and metal ion concentration were investigated, analyzed, and optimized. The experimental data were fitted to Langmuir and Freundlich adsorption isotherm. For an initial concentration of 0.1 mg/L (100 ppb), the optimum adsorbent dose was determined as 1 g/25 mL for nickel and cadmium. During the experiments, the adsorption process reached equilibrium at 30 minutes and the maximum removal efficiency for both heavy metals was obtained at 40°C. In adsorbent size experiments, the highest efficiency was determined as 0.5 mm for nickel and >2 mm for cadmium. It is seen that the experimental data fit the Langmuir and Freundlich adsorption models. As a result of the study, it was revealed that bentonite clay obtained from the Eskişehir region can be used effectively for the removal of cadmium and nickel from aqueous solution.

Keywords

Adsorption, Nickel, Cadmium, Bentonite, Isotherm, Kinetics

Sulardan Bentonit ile Nikel ve Kadmiyum Gideriminde Sıcaklık, Doz, Boyut ve Temas Süresinin Etkilerinin İncelenmesi

Abstract

Ağır metaller, birikim özelliği ve sucul ortamlardan uzaklaştırılmasındaki güçlük gibi nedenlerle suların kalitesinin bozulup kirlenmesine yol açmaktadır. Nikel ve kadmiyum da bu ağır metalar arasında yer almaktadır. Adsorban olarak Eskişehir bölgesinden temin edilen bentonitin kullanıldığı bu çalışmada sentetik olarak hazırlanan sudaki nikel ve kadmiyumun giderimi amaçlanmıştır. Bentonit kili üzerine nikel ve kadmiyumun maksimum adsorpsiyonunu sağlamak amacıyla pH değeri, adsorban dozu, karıştırma süresi, hız ve metal iyonu konsantrasyonu gibi parametreler incelenmiş, analiz edilmiş ve optimizasyonu sağlanmıştır. Deneysel veriler Langmuir ve Freundlich adsorpsiyon izotermine uyarlamıştır. 0.1 Adsorban boyutu deneylerinde ise en yüksek verim, Nikel için 0,5 mm olarak belirlenirken kadmiyum için ise >2 mm boyutta tespit edilmiştir. Deneysel verilerin Langmuir ve Freundlich adsorpsiyon modellerine uyduğu görülmektedir. Çalışma sonucunda, Eskişehir bölgesinden elde edilen bentonit kilinin sulu çözeltiden kadmiyumun ve nikelin uzaklaştırılması için etkili bir şekilde kullanılabileceği ortaya konmuştur.

Keywords

Adsorpsiyon, Nikel, Kadmiyum, Bentonit, İzoterm, Kinetik

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