حذف فلز سنگین روی از فاضلاب با استفاده از نانوکامپوزیت طبیعی کیتوسان/ اکسید گرافن استخراج شده از ضایعات میگو

Abstract

Background and Objective: Heavy metal pollution accounts are the most important of water pollutions for a considerable proportion due to the serious diseases jeopardized the ecological environment and human life and health. Therefore, immediate and expanded attention is required to remove toxic metal ions from contaminated water.Methods: The effects of initial solution pH (2-7), chitosan/graphene oxide biosorbent dose (0-1.5 g/l), initial zinc (II) concentration (10-200 mg/l) and contact time on the uptake capacity of metal (30- 420 min) were investigated.Findings: This nanocomposite was exhibited the highest metal ions uptake capacity (89.2 mg/g) at pH value of 4.0, biomass dose 0.01 g/l, metal concentration of 200 mg/l and contact time 420 min. The structural stability and efficient adsorption capacity of adsorbent was proved after four times adsorption–desorption cycles and after that uptake capacity was 19.35 mg/g. Discussion and Conclusion: The results showed that the synthesized nanocomposite could be used as a potentially good adsorbent to remove Zn2+ simultaneously in aqueous solutions.Keywords: Bio-nanocomposite; Chitosan; Graphene oxide; Zinc metal; Wastewater