PEMBUATAN NANOFIBER KOMPOSIT POLY (ACRYLIC ACID) (PAA)/SIO2 YANG DIMODIFIKASI GUGUS MERKAPTO UNTUK ADSORPSI ZAT WARNA KATIONIK
Methylene blue is a cationic dye which is generally obtained in industrial waste. The dye is often used in dyeing textiles, paper, wool, and cosmetics. The existence of the dye in the water despite the low concentrations can be affect the appearance and quality of the water. Therefore we needed path...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/21550 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Methylene blue is a cationic dye which is generally obtained in industrial waste. The dye is often used in dyeing textiles, paper, wool, and cosmetics. The existence of the dye in the water despite the low concentrations can be affect the appearance and quality of the water. Therefore we needed pathways to remove the dye from the water. One method that is widely used is the adsorption method. Adsorption method is one of the most popular methods to remove these dyes. Adsorption efficiency, selectivity, equilibrium time, regeneration, and stability usually depend on the material characteristics of the adsorbents. One of the interesting adsorbent to be studied is the nanofiber. Nanofiber adsorbents is a fibers of nanometer sized which have functional characteristics of high surface area, flexibility and greater adsorption capacity. This study has been conducted synthesis of PAA/SiO2 and PAA/SiO2 composite nanofiber are functionalized with mercapto group using sol- gel method and electrospinning methods. The optimum conditions electrospinning process is conducted at room temperature obtained at concentrations of PAA 20% (w/v), the power supply voltage 22 kV, the distance the needle to the collector of 15 cm and a flow rate of 0.005 mL/min. Characterization adsorbent using FTIR, SEM-EDX, TEM and BET to see functional groups, surface morphology, pore size and surface area of the adsorbent. FTIR characterization results indicated a shift in the vibrational wave number 2557,61 cm-1 indicating that mercapto functional groups has been successfully added to the PAA/SiO2 composite nanofiber. Characterization of SEM shows the surface morphology and the size difference nanofiber diameter. Diameter size of PAA, PAA/SiO2 and PAA/SiO2 TMPTMS composite nanofiber respectively for 681, 382,5 and 246 nm. The results of characterization PAA/SiO2 and PAA/SiO2 TMPTMS nanofiber using TEM obtained porous and uneven surface of nanofiber, the size of the pore diameter of PAA/SiO2 TMPTMS nanofiber larger than the size of the diameter of the PAA/SiO2 nanofiber. The characterization results obtained BET surface area of PAA/SiO2 nanofiber is 27.67 m2/g and a surface area PAA/SiO2 TMPTMS nanofiber of 108.54 m2/g. Characterization retention properties of nanofiber synthesized done by evaluating the adsorption pH, contact time, initial concentration of adsorbate and adsorbent mass. The results show that the maximum adsorption capacity of sorption methylene blue by adsorbent PAA/SiO2 dan PAA/SiO2 TMPTMS nanofiber was found to be 400 and 437,78 mg/g at pH 10 for 120 minutes of contact time. The effect of adsorption conditions on the capacity and kinetics was also investigated by Langmuir isotherm and Freundlich isotherm model, and pseudo first-order and pseudo second-order equation. The results show that the process of adsorption of methylene blue onto adsorbent PAA/SiO2 and PAA/SiO2 composite nanofiber followed the Langmuir adsorption isotherm. The adsorption kinetics of methylene blue onto the PAA/SiO2 and PAA/SiO2 composite nanofiber adsorbent is best described by a pseudo second- order equation. <br />
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