Bacterial cellulose (BC) produced from coconut water, commonly known as nata de coco, is a biopolymer with enormous properties. Compared to plant cellulose, BC has better mechanical strength and a greater degree of polymerization. BC’s high purity and high porosity make it a suitable candidate for the embedding and dispersion template for silver nanoparticles (AgNPs). This study investigated a facile and scalable method of making BC from coconut water and impregnated them with AgNO3 solution to produce AgNPs templated BC. The resulting materials were characterized by Fourier transform infra-Red (FTIR), scanning electron microscope (SEM), energy dispersive X-ray (EDX), and X-ray diffraction (XRD). The thermal stability was also investigated by thermogravimetric analysis (TGA). The antibacterial activity of AgNPs templated BC was challenged in cultures of gram-positive bacteria Staphylococcus aureus and gram-negative bacteria Escherichia coli and showed an inhibition zone of growth in agar media. This study proves that the resulting AgNPs templated BC sheets are potential materials for antibacterial and industrial application that are low cost and easy to produce.
Limbah padat industri karet sukar mengalami degradasi di alam sehingga memerlukan pengelolaan dengan baik. Penelitian ini bertujuan untuk mempelajari pengaruh penambahan karet reklim dari limbah outsole terhadap sifat fisis dan sifat thermal dari produk outsole. Pencampuran karet dan bahan aditif lainnya dilakukan menggunakan mesin kneader dan open mill sedangkan proses vulkanisasi dilakukan dengan mesin hydraulic press. Variasi yang digunakan adalah jumlah karet reklim yang ditambahkan yaitu 12,5; 37,5 dan 62,5 phr. Hasil penelitian ini menunjukan bahwa produk outsole dengan penambahan karet reklim memberikan hasil organoleptis berupa permukaan rata, tidak retak, tidak pecah, tidak kotor dan kesamaan ukuran untuk semua variasi. Pengujian fisis menunjukan ketahanan kikis, kuat tarik dan perpanjangan putus akan mengalami penurunan, sedangkan nilai kekerasan cenderung naik dengan penambahan karet reklim. Ketahanan retak lentur menunjukan hasil untuk penambahan 12,5 dan 37,5 phr dalam kondisi baik dan tidak retak, sedangkan pada 62,5 phr sudah mengalami keretakan. Hasil pengujian kestabilan thermal menunjukan bahwa sampel memiliki kestabilan thermal relatif sama. Hasil penelitian ini menunjukan jika penambahan karet reklim dari limbah outsole sampai 37,5 phr memiliki potensi tinggi sebagai filler pada kompon karet untuk outsole.
Abstract. The adsorption of Fe(II) from aqueous solutions by acid modified jackfruit wood sawdust biosorbent was investigated in a batch adsorption system. The experiment conducted at room temperature and pH 5 resulted adsorption behaviour of chemical modified Jackfruit wood sawdust biosorbent. The removal of Fe(II) has been found to be the function of initial Fe(II) concentration, acid type and acid concentration. The best removal was at low Fe(II) initial concentration, the higher initial concentration resulted on lower adsorption. Untreated jackfruit wood sawdust has the highest adsorption efficiency, followed by acetic acid, citric acid and tartaric acid modified jackfruit wood sawdust. The maximum uptake capacity of Fe (II) ion was 1.05 mg/g by untreated jackfruit wood sawdust.
One of the ester product of glycerol and acetic acid is triacetin which has wide industrial aplication. In this study the esterification of glycerol with acetic acid over Lewatite catalyst to produce triacetin, were carried out. Lewatite is one of ion exchange resin, the use of ion exchange resins as catalyst will not produce waste, not corrosive, high thermal stability and has good selectivity. The esterification reaction of glycerol with acetic acid were performed in a three-neck flask with stirrer (175 rpm) at temperature (90 °C, 100 °C and 110 °C) and atmosphere pressure. A 9.66 % selectivity of triacetin with conversion (77.4 %) was achieved at 100 °C within 90 minutes of reaction time. This research aimed to report experimental data and kinetic modeling of glycerol esterification with acetic acid to evaluate and compare model performance and capability. A kinetic model was developed using a first order pseudo-homogeneous model according to the experimental data. The surface reaction of acetic acid with glycerol was assumed to be rate-controlling. The effect of temperature to rate of reaction constants can be expressed as follows: k r = 8.138 x 10 11 exp ( − 57 , 176.47 R T ) ( 1 s )
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