Sintesis dan Uji Aktivitas Senyawa C-4-Hidroksi-3-Metoksifenilkaliks[4]resorsinarena Sebagai Adsorben Ion Fe(III)

Poppy Sulistyawati, Prof. Drs. Jumina, Ph.D; Dr.Sc. Robby Noor Cahyoni, S.Si., M.Sc

2024 | Skripsi | KIMIA

Telah dipelajari mekanisme adsorpsi ion Fe(III) dalam medium air oleh senyawa organik turunan kaliks[4]resorsinarena. Tujuan dari penelitian ini untuk mensintesis senyawa adsorben C-4-hidroksi-3-metoksifenilkaliks[4]resorsinarena serta menguji aktivitas adsorbsinya terhadap ion Fe(III) dalam kajian kinetika, model isoterm dan termodinamika. Penelitian diawali dengan melakukan sintesis senyawa C-4-hidroksi-3-metoksifenilkaliks[4]resorsinarena dengan mereaksikan vanilin dan resorsinol menggunakan metode refluks selama 20 jam dengan katalis HCl dalam pelarut etanol. Senyawa produk dikarakterisasi dengan spektrometer FTIR, 1H-NMR dan LC-MS. Kajian adsorpsi dilakukan dalam sistem batch dengan variasi pH larutan, waktu interaksi, konsentrasi larutan dan suhu lingkungan. Kajian kinetika adsorpsi dianalisis menggunakan persamaan Lagergren, Ho&McKay dan Santosa. Kajian isoterm adsorpsi dianalisis dengan persamaan Langmuir dan Freundlich.

Hasil sintesis senyawa C-4-hidroksi-3-metoksifenilkaliks[4]resorsinarena diperoleh sebagai padatan berwarna merah muda pucat dengan rendemen sebesar 93,96%. Berdasarkan kajian adsorpsi yang telah dilakukan diperoleh persentase adsorpsi ion Fe(III) optimum pada pH 4 dan waktu pengadukan 30 menit, sedangkan konsentrasi awal adsorpsi diperoleh 100 ppm. Proses adsorpsi ion logam Fe(III) oleh C-4hidroksi-3-metoksifenilkaliks[4]resorsinarena mengikuti model kinetika Ho&McKay dengan kapasitas adsorpsi maksimum 2,174 mg/g. Model isoterm lebih sesuai dengan model isoterm Freundlich dengan kapasitas adsorpsi maksimum 6,649 mg/g. Kajian termodinamika menunjukkan proses adsorpsi spontans, endotermik, disosiatif dan kemosorpsi atara ion logam Fe(III) dan adsorben.

The adsorption mechanism of Fe(III) ions in aqueous medium by organic compounds derived from calix[4]resorcinarene has been studied. The purpose of this study was to synthesize adsorbent compounds C-4-hydroxy-3-methoxyphenylcalix[4]resorcinarene and to test its adsorption activity foe Fe(III) ions in the study of kinetics, thermodynamics and isoterm models.The research was initiated by synthesizing the C-4-hydroxy-3-methoxyphenylcalix[4]resorcinarene compound through reacting vanilin and resorcinol via reflux method foe 20 hours with HCl catalyst in ethanol solvent. The produced compounds were characterized by FTIR, 1H-NMR and LC-MS spectrometers. Adsorption studies were carried out using a batch system with variations in solution pH, interaction time, solution concentration and ambient temperature. Adsorption kinetics were analyzed using the Lagergren, Ho&McKay and Santosa equations while the adsorption isotherm was analyzed by the Langmuir and Freundlich equations.

The produced compound of C-4-hydroxy-3-methoxyphenylcalix[4]resorcinarene was obtained as a pale pink solid with a yield of 93.96%. Based on the adsorption studies that have been carried out, the optimum persen adsorption of Fe(III) ions was obtained at pH 4 and a strirring time of 30 minutes while the initial concentration of adsorption was obtained at 300 ppm.The adsorption process of Fe(III) metal ions by C-4-hydroxy-3-methoxyphenylcalix[4]resorcinarene follows the Ho&McKay mode with a minimum adsorption capacity of 2.174 mg/g. The isoterm model follows the Freundlich isoterm model with a maximum adsorption capacity of 6.649 mg/g. Thermodynamic syudies show spontaneous adsorption, endothermmic, dissociative, and chemosorption processes between Fe(III) metal ions and adsorbent.

Kata Kunci : Fe(III), kaliks[4]resorsinarena, kinetika, isoterm, termodinamika