การกำจัดไอออนโลหะหนักโดยเปลือกเมล็ดทานตะวันปรับสภาพด้วยสารเคมี

Abstract

This chemical engineering project entitled “Removal of heavy metal ions by chemical modified sunflower seed husks” was studied in batch experiment. Sunflower seed husks were modified by chemical activation; potassium carbonate and zinc chloride solution, then followed by carbonization. The concentration of both chemicals was varied between 0.4 and 1.2 M, the temperature was ranged from 400 to 700 °C. The metal ions used in this experiment were lead(II) nickel(II) zinc(II) and cadmium(II) with 200 mg/g initial concentration. From our experimental data showed that the 0.8 M potassium carbonate and zinc chloride gave the optimum metal ions removal. The maximum removal of lead(II) nickel(II) zinc(II) and cadmium(II) ions was occurred by 500 ๐C-K2co3 modified husks with 99.61, 98.07, 98.75 and 92.99 percent respectively. Furthermore in zinc chloride activation, 400 °C-ZnCl-» modified husks showed the maximum removal of lead(Il) nickel(II) zinc(II) and cadmium(Il) ions with the value of 75.68, 51.79, 28.07 and 50.33 percent respectively. The adsorption process conformed to the Langmuir adsorption isotherms with the maximum adsorption of lead(II) nickel(II) zinc(II) and cadmium(II) with 19.92, 18.56, 19.76 and 19.62 mg/g respectively and Kl of 0.1640, 0.1585, 0.1005 and 0.1918 L/mg respectively.