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

Idha Yulia Ikhsani, Prof. Drs. Sri Juari Santosa, M.Eng., Ph.D.

2014 | Tesis | S2 Ilmu Kimia

Telah dilakukan kajian perbandingan kemampuan adsorpsi zat warna navy blue dan yellow F3G dalam limbah pewarnaan kain anti alat pencitra NIR oleh Ni-Zn layered hydroxide salts (LHS) dan Mg-Al layered double hydroxides (LDH). Ni-Zn LHS disintesis dengan metode hidrolisis atas garam nikel asetat dan seng asetat. Mg-Al LDH disintesis dengan metode kopresipitasi dari garam magnesium nitrat dan alumunium nitrat. Limbah pewarnaan kain anti alat pencitra NIR diperoleh melalui proses hidrotermal larutan campuran zat warna navy blue dan yellow F3G. Variasi dilakukan untuk mendapatkan kondisi adsorpsi optimum meliputi pH, waktu kontak dan konsentrasi zat warna. Kondisi optimum yang diperoleh diaplikasikan untuk adsorpsi limbah pewarnaan kain. Dipelajari pula kemampuan adsorben dalam penggunaan berulang. Hasil penelitian menunjukkan kondisi optimum adsorpsi navy blue dan yellow F3G pada Ni-Zn LHS dan Mg-Al LDH berturut–turut berlangsung pada pH 3 dan 4. Waktu kontak optimum zat warna navy blue dan yellow F3G pada adsorben Ni-Zn LHS adalah 120 dan 150 menit, sedangkan pada Mg-Al LDH adalah 90 dan 120 menit. Adsorpsi kedua zat warna oleh kedua adsorben mengikuti kinetika reaksi pseudo orde dua Ho. Perhitungan model isotermal adsorpsi menunjukkan adsorpsi navy blue oleh kedua adsorben mengikuti model Freundlich, sedangkan adsorpsi yellow F3G mengikuti model Langmuir. Ketika diaplikasikan untuk mengadsorp zat warna dalam limbah pewarnaan kain, Ni-Zn LHS memiliki kemampuan mengadsorp lebih baik dibanding Mg-Al LDH ditunjukkan oleh kapasitas adsorpsi Ni-Zn LHS sebesar 52,33 mg/g sedangkan Mg-Al LDH sebesar 30,54 mg/g. Proses kalsinasi meningkatkan kapasitas adsorpsi Mg-Al LDH menjadi 84,75 mg/g, namun menurunkan kapasitas adsorpsi Ni-Zn LHS menjadi 42,65 mg/g.

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.

Kata Kunci : Ni-Zn LHS, Mg-Al LDH, adsorpsi, navy blue, yellow F3G