STUDI KOMPARASI Ni-Zn LHS DAN Mg-Al LDH SEBAGAI ADSORBEN ZAT WARNA NAVY BLUE DAN YELLOW F3G

Abstract

The adsorption of navy blue and yellow F3G dyes in waste water of dyeing fabric having ability for anti NIR detection device by Ni-Zn layered hydroxide salt (LHS) and Mg-Al layered double hydroxide (LDH) has been studied in this work. Ni-Zn LHS was synthesized by hydrolysis method using nickel acetate and zinc acetate salts as precursors. Mg-Al LDH was synthesized by coprecipitation method of magnesium nitrate and aluminum nitrate salts. Waste water of fabric dyeing for anti NIR detection device was obtain through hydrothermal process of mixed solution of navy blue and yellow F3G. To obtain optimum adsorption condition for each dye on each adsorbent, variation of acidity, concentration of dye and interaction time has been done. It has been also studied the ability of adsorbent to reused. The result showed that optimum adsorption condition of navy blue and yellow F3G on Ni-Zn LHS and Mg-Al LDH was at pH 3 and 4, respectively. The optimum interaction time for navy blue and yellow F3G on Ni-Zn LHS was 120 and 150 minutes, respectively, while that for navy blue and yellow F3G on Mg-Al LDH was 90 and 120 minutes. Adsorption of both disperse dyes by the two adsorbents followed Ho pseudo second order kinetics. Adsorption equilibrium of navy blue on both adsorbent followed Freundlich isotherm adsorption, while that of yellow F3G followed Langmuir isotherm adsorption. When applied to adsorb dyes in waste water, Ni-Zn LHS has better capability than Mg-Al LDH, as indicated by its adsorption capacity as high as 52.33 mg/g, while that of Mg-Al LDH was 30.54 mg/g. Calcination of the already used adsorbent increased the adsorption capacity of Mg-Al LDH to 84.75 mg/g, but decreased the adsorption capacity of the Ni-Zn LHS to 42.65 mg/g