Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
Molecularly imprinted polymers (MIPs) have been the most convenient and selected methods in detection and extraction for many types of specific targets in various fields. MIPs were prepared by mixing template molecule with functional monomer in the presence of cross-linker, solvent and initiator. The selectivity of MIPs is strongly influenced by the types of functional monomer, solvent and polymerization process used. Pyrogallol-imprinted polymer (Py-IP) and non-imprinted polymer (NIP) were synthesized via precipitation polymerization using 4-vinylpyridine (4-VP), divinylbenzene (DVB) and azobisisobutyronitrile (AIBN) as functional monomer, cross-linker and initiator, respectively. Pyrogallol (Py) was used as a target molecule. The synthesized polymers were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and UV-Visible Spectroscopy (UV-Vis). In this study, adsorption capacity was measured by the dosage effect, contact time and selectivity study. Results showed that maximum adsorption capacity by Py-IP is above 50%. The Selectivity study shows that k? is >1, which indicates that Py-IP has a good selectivity towards pyrogallol. Therefore, it has a good potential to be used as an adsorbent.

Abstrak :
Molecularly imprinted polymers (MIPs) have been the most convenient and selected methods in detection and extraction for many types of specific targets in various fields. MIPs were prepared by mixing template molecule with functional monomer in the presence of cross-linker, solvent and initiator. The selectivity of MIPs is strongly influenced by the types of functional monomer, solvent and polymerization process used. Pyrogallol-imprinted polymer (Py-IP) and non-imprinted polymer (NIP) were synthesized via precipitation polymerization using 4-vinylpyridine (4-VP), divinylbenzene (DVB) and azobisisobutyronitrile (AIBN) as functional monomer, cross-linker and initiator, respectively. Pyrogallol (Py) was used as a target molecule. The synthesized polymers were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and UV-Visible Spectroscopy (UV-Vis). In this study, adsorption capacity was measured by the dosage effect, contact time and selectivity study. Results showed that maximum adsorption capacity by Py-IP is above 50%. The Selectivity study shows that k’ is >1, which indicates that Py-IP has a good selectivity towards pyrogallol. Therefore, it has a good potential to be used as an adsorbent.

Abstrak :
Penyimpanan gas metana hingga saat ini terus dikembangkan agar dapat dimaksimalkan di tingkat global. Selain melalui metode LNG atau CNG, pengembangan metode penyimpanan metana melalui adsorbed natural gas (ANG) menjadi salah satu yang dioptimalkan karena parameter penyimpanannya yang ditetapkan hanya pada temperatur ruangan dan tekanan sekitar 35 Bar. Dengan dasar tersebut, salah satu upaya pengoptimalan penyimpanan metana dengan metode ANG adalah dengan mengembangkan adsorben yang memiliki kapasitas adsorpsi tinggi namun ramah lingkungan. Maka dari itu, dikembangkan Bio-MOF Zinc glutamate. Adsorben berbasis Zinc telah dikenal sangat baik kemampuannya untuk aplikasi adsorpsi dan penyimpanan gas. Dalam penelitian ini, Bio-MOF tersebut disintesis dengan metode sonochemical dengan 7 buah variasi (A1, A2, A3, A4, A5, B, dan C) yang mana tiap variasinya dikarakterisasikan dengan BET, SEM, XRD, dan TGA untuk mendapatkan informasi yang terperinci terkait adsorben tersebut. Diketahui bahwa adsorben ini memiliki BET Surface Areasebesar 8.389 m2/g. Kemudian, dilakukan uji adsorpsi isotermal gas metana dari Bio-MOF Zinc glutamate pada temperatur 27, 35, dan 50. Rentang tekanannya adalah 2 Bar-35 Bar. Berdasarkan hasil uji adsorpsinya, Kapasitas penyerapan puncak pada 27  bertekanan 35 Bar adalah 0.0553 g/g, kemudian pada temperatur 35  mencapai 0.0513 g/g, dan terakhir pada temperatur 50  mencapai 0.0412 g/g. Dilakukan fitting korelasi adsorpsi isotermal melalui korelasi Langmuir, Freundlich, dan Sips yang menunjukkan bahwa korelasi Sips memiliki fitting terbaik dan didapat panas adsorpsi isosterik sebesar 7.448 kJ/mol dengan persamaan Clausius-Clapeyron. ......Methane gas storage is still being researched in order to exploit its global potential. Aside from using LNG or CNG, the development of methane storage solutions using adsorbed natural gas (ANG) is one that is optimum because the storage settings are simply established at room temperature and a pressure of roughly 35 Bar. Based on this, one of the initiatives to optimize methane storage using the ANG technique is to design an ecologically friendly adsorbent with a high adsorption capacity. As a result, Bio-MOF Zinc glutamate was created. Zinc-based adsorbents are widely known for their capacity to absorb and store gas. The Bio-MOF was synthesized using the sonochemical approach with seven variations (A1, A2, A3, A4, A5, B, and C), each of which was characterized using BET, SEM, XRD, and TGA to gain essential information. details regarding the adsorbent. This adsorbent has a BET Surface Area of 8.389 m2/g, which is known. Then, at temperatures of 27°C, 35°C, and 50°C, an isothermal adsorption test of methane gas from Bio-MOF Zinc glutamate was performed. The pressure range is from 2 bar to 35 bar. Based on the sorption test results, the maximum absorption capacity was 0.0553 g/g at 27°C and 35 bar pressure, and then reached 0.0513 g/g at a temperature of 35°C. g/g and finally reached 0.0412 g/g at a temperature of 50°C. Isothermal adsorption correlation fits were performed using the Langmuir, Freundlich, and Sips correlations and found that the Sips correlation was the best fit, yielding an isothermal heat of adsorption of 7.448 kJ/mol using the Clausius-Clapeyron equation was shown.