Bahan mesoporous menjana banyak perhatian kerana potensi mereka dalam pelbagai aplikasi termasuk dalam pemangkinan, penjerapan, nanoteknologi dan banyak potensi lain. Walau bagaimanapun, fokus kajian ini adalah hanya untuk mengkaji penjerapan chloramphenicol, yang merupakan antibiotik pada SBA-15 sampel silika yang disediakan. Pertama, silika SBA-15 disediakan dengan menggunakan prosedur yang dibincangkan dalam Bab 3. Seterusnya, percubaan penjerapan dijalankan. Sebelum penjerapan, analisis chloramphenicol dilakukan pada panjang gelombang maksimum 276 nm. Kemudian, proses penjerapan dijalankan pada pelbagai kepekatan awal (10 hingga 50 mg L-1) dan pH (pH 3, pH 5, pH 7, pH 9 dan pH 11) pada 30 ℃, 40 ℃ dan 50 ℃. Bagi sebahagian pencirian, SEM dan TEM imej yang diperolehi yang menunjukkan bahawa SBA-15 diperintahkan. Selain itu, XRD, BET dan analisis FTIR juga dilakukan yang dibincangkan dalam Bab 4. Pencirian dilakukan untuk menentukan sifat-sifat, morfologi, saiz dan kumpulan berfungsi sample silika SBA-15 yang disediakan. Untuk menganalisis data eksperimen, pertama plot peratusan pengeluaran dengan masa diplotkan untuk mengkaji kesan kepekatan awal dan suhu pada kapasiti sampel silika SBA-15. Selain itu, plot keserapan terhadap masa pada nilai pH yang berbeza juga diplotkan untuk mengkaji kesan pH ke atas kecekapan pengeluaran. Kinetik penjerapan dan isoterma penjerapan juga dikira. Model kinetik Pseudo-pertama dan perintah Pseudo-kedua digunakan untuk menganalisis data eksperimen bagi kinetik dan ia menyimpulkan bahawa data experiment sesuai dengan model kinetik Pseudo-pertama. Bagi isoterma, model isoterma Langmuir, Freundlich dan Temkin digunakan untuk menganalisis data eksperimen. Keputusan yang diperolehi menunjukkan bahawa data eksperimen terbaik sesuai dengan Langmuir dan Freundlich model isoterma.
_______________________________________________________________________________________________________
Mesoporous materials are generating a lot of attention due to their potentials in a variety of applications which include in catalysis, adsorption, nanotechnology and many other potentials. However, the focus of this research is only to study the adsorption of chloramphenicol, which is an antibiotic on the prepared SBA-15 silica sample.
First, the SBA-15 silica is prepared using the procedure discussed in Chapter 3. Next, adsorption experiment is carried out. Prior to adsorption, chloramphenicol analysis is done at maximum wavelength of 276 nm. Then, adsorption process is carried out at varying initial concentrations (10 to 50 mg L-1) and pH (pH 3, pH 5, pH 7, pH 9 and pH 11) at 30 ℃, 40℃ and 50 ℃.
For the characterization part, SEM and TEM images are obtained which showed that the SBA-15 is ordered. Besides that, XRD, BET and FTIR analysis are also done which is discussed in Chapter 4. Characterization is done to determine the properties, morphology, size and functional groups of SBA-15 silica sample prepared.
To analyze the experimental data, firstly the plots of percentage removal with time are plotted to study the effect of initial concentrations and temperatures on the capacity of SBA-15 silica sample. Besides that, plot of absorbance against time at different pH values are also plotted to study the effect of pH on the removal efficiency.
Adsorption kinetics and adsorption isotherms are also calculated. Pseudo-first order and Pseudo-second order models are used to analyze the experimental data for the kinetics and it is concluded that the data fit Pseudo-first order model well.
For the isotherms, Langmuir, Freundlich and Temkin isotherm models are used to analyze the experimental data. The results obtained showed that the experimental data best fit the Langmuir and Freundlich isotherm models.
Adsorption of chloramphenicol on ordered mesoporous silica (SBA-15) / Nurlina Gafoor