Pengaruh Waktu Kontak dan Kecepatan Pengadukan Terhadap Adsorpsi Zat Warna Metilen Biru dengan Karbon Aktif Dari Kulit Durian Menggunakan KOH Sebagai Aktivator

Abstract

This study aims to determine the effect of contact time and stirring speed to achieve the maximum value of the absorption dye methylene blue using durian shell activated carbon with KOH 2% as activator. FTIR analysis showed the activation process affects the absorption intensity in the wavelength region and resulted in the formation of C = C aromatic ribbon on activated carbon durian skin. Analysis performed using an UV-Vis spectrophotometer to determine the absorbance values and the final concentration of methylene blue solution at each variation of contact time and stirring speed. The results of the research with activators KOH 2% showed maximum adsorption capacity is at stirring speed of 150 rpm and contact time 90 minutes is equal to 3.92 mg/g, whereas the maximum surface area is at stirring speed 130 rpm and contact time 120 minutes that is equal to 1785,263 m2 /g. From the results of theoretical calculations, the correlation coefficient (R2 ) of order two is closer to one (1) compared to the first order. The equation of first order has a value of R2 = 0.808 and equations second order has a value of R2 = 0.993, so that second order kinetics adsorption more represents to data of this study. Order two indicated that the adsorption involves chemical reactions