ADSORPSI ZAT WARNA NAPHTOL MENGGUNAKAN ADSORBEN KULIT BUAH KAKAO (Theobroma cacao L.)

Abstract

Abstrak

Penelitian adsorpsi zat warna naphtol menggunakan adsorben kulit buah kakao (Theobroma cacao L.) telah dilakukan. Penelitian ini bertujuan untuk mengetahui karakteristik adsorben arang aktif kulit buah kakao (Theobroma cacao L.), mengetahui pengaruh pH, waktu kontak dan konsentrasi adsorpsi arang aktif kulit buah kakao (Theobroma cacao L.) terhadap zat warna naphtol dan mengetahui kapasitas adsorpsi arang aktif kulit buah kakao (Theobroma cacao L.) terhadap zat warna naphtol. Metode yang digunakan dalam penelitian ini adalah adsorpsi. Hasil yang diperoleh yaitu karakteristik dari adsorben arang aktif kulit buah kakao hasil analisis FTIR menunjukan bahwa adsorben  kulit buah kakao teraktivasi HCL mengandung gugus fungsi –OH, C-H, CH₂, C-O dan C=C aromatik, hasil analisis SSA diperoleh luas permukaan sebesar 178,10 m²/g, dengan volume pori sebesar 0,16 cc/g dan ukuran pori sebesar 1,80 nm. Kondisi optimum adsorben arang aktif kulit buah  kakao terjadi pada pH 4, waktu kontak 90 menit dan konsentrasi 60 ppm. Kapasitas adsorpsi arang aktif kulit buah kakao dalam mengadsorpsi zat warna naphtol adalah sebesar 5,8651 mg/g. pola isoterm adsorpsi mengikuti isoterm langmuir dengan nilai R² sebesar 0,8275 dan energi adsorpsi sebesar 25,627905 KJ/mol.

Abstract

Research on the adsorption of naphtol dyes using cocoa pods (Theobroma cacao L.) as an adsorbent has been carried out. This study aims to determine the characteristics of the adsorbent of activated charcoal cocoa pods (Theobroma cacao L.), determine the effect of pH, contact time and adsorption concentration of activated charcoal cocoa pods (Theobroma cacao L.) on naphtol dyes and determine the adsorption capacity of activated charcoal skins. cocoa pods (Theobroma cacao L.) against naphtol dyes. The method used in this research is adsorption. The results obtained are the characteristics of the activated charcoal adsorbent of cocoa pods. FTIR analysis results show that the adsorbent of activated cocoa pods HCL contains functional groups –OH, CH, CH2, CO and C=C aromatics, the results of SSA analysis obtained a surface area of ​​178.10 m2/g, with a pore volume of 0.16 cc/g and a pore size of 1.80 nm. The optimum condition of activated charcoal adsorbent of cocoa pods occurred at pH 4, contact time of 90 minutes and concentration of 60 ppm. The adsorption capacity of activated charcoal of cocoa pods in adsorption of naphtol dye was 5.8651 mg/g. The adsorption isotherm pattern followed the Langmuir isotherm with an R2 value of 0.8275 and an adsorption energy of 25.627905 KJ/mol.