TY - JOUR T1 - Study of optimizing the process of Cadmium adsorption by synthesized silver nanoparticles using Chlorella vulgaris TT - مطالعه بهینه‌سازی جذب سطحی کادمیوم با نانوذرّات نقره ساخته‌شده توسط کلرلا ولگاریس JF - Yektaweb JO - Yektaweb VL - 23 IS - 2 UR - http://journal.bums.ac.ir/article-1-2098-en.html Y1 - 2016 SP - 119 EP - 129 KW - Adsorption KW - Cadmium KW - Silver nanoparticles N2 - Background and Aim: Cadmium (Cd) is one of the most toxic heavy metals in water that mostly enters the water cycle through industrial waste water. Silver nanoparticles have the capacity to remove heavy metals from the water resources through the mechanism of adsorption. The present study aimed at producing silver bio-nanoparticles and optimizing . Cd removal from aquatic solutions. Materials and Methods: Silver bio-nanoparticles were extracted via a micro-algae Chlorella vulgaris extract and silver nitrate synthesis. Then, the characteristics of the particles were determined using FT-IR, XRD, SEM devices. In order to optimize Cadmium adsorption by means of silver nanoparticles, parameters including pH, reaction time, initial concentration of Cd and concentrations of nanoparticles were studied under different conditions. Results: The resulting nanoparticles were spherical, single and crystalline, whose sizes were 10-45 nm. Under the condition of PH = 8, the initial concentration of cadmium 0.5 mg/L, adsorbent dosage of 0.5 mg, reaction time of 10 min, temperature of 300C and mixing speed of 200 rpm, 99% of cadmium was removed. Isotherm of Cadmium-ion adsorption followed Langmuir (R2> 0/96 (and Freundlich (R2> 0/94) models. Conclusion: Under optimal conditions, silver bio-nanoparticles had the capacity of quick and effective adsorption of cadmium. Thus, with a cheap, non-toxic and environmentally friendly method can remove heavy metals in a short time. M3 ER -