Dolomite utilization for removal of Zn۲+ and Cu۲+ ions from wastewater before determination by flame atomic absorption spectroscopy

This study aims to use dolomite to remove Zn۲+ and Cu۲+ from wastewater. The adsorption process of the Zn۲+ and Cu۲+ was performed using the batch method at various factors (such as the amount of adsorbent, contact time, particle size, pH media, temperature, and initial concentration) to investigate the optimum removal conditions. The flame atomic absorption spectroscopy (F-AAS) was used to determine Zn۲+ and Cu۲+ after removal steps. The LOD of Zn۲+ and Cu۲+ were ۰.۰۵ mg L-۱ and ۰.۰۸ mg L-۱, respectively. Results showed that the adsorbent dolomite efficiently removed Zn۲+ and Cu۲+ with up to ۹۸ % when ۰.۴ g of dolomite was used. The smaller dolomite particle size had higher removal efficiency for Zn۲+ and Cu۲+ ions. The results showed the removal of Zn۲+ and Cu۲+ was the maximum in the basic medium. Also, the removal of ions reached the maximum when dolomite had been in contact for ۳۰ minutes with the wastewater. The experimental results of Langmuir and Freundlich adsorption isotherms show linearity where R۲ is more than (۰.۹۹۸ and ۰.۹۷۸) and (۰.۹۹۱۵ and ۰.۹۹۹۶) for Zn۲+ and Cu۲+, respectively. The qmax was obtained at ۹۱.۷۴ mg g-۱ for Cu۲+ and ۴۴.۲۴ mg g-۱ for Zn۲+.

کلیدواژه ها:

Flame atomic absorption spectroscopy ، Adsorption ، Dolomite ، Wastewater ، Heavy metal ions