Photodegradation is a save and low cost methods to clean water bodies from some organic pollutants. The method has been developed in term of increasing the efficiency of the degradation capacity of photocatalyst. The photocatalyst working under visible light is the most desirable. The preparation of silica supported nickel-copper oxide [(Ni-Cu)Ox@SiO2] catalyst and the use of the catalyst in the photodegradation of methylene blue in the water are reported. The catalyst was prepared by impregnating the silica support into the mixture of nickel and copper salts, followed by calcination at 800○C for 4 hours. A series method of XRD, SEM-EDX, and UV-Vis Diffuse Reflectance has been used to characterize the catalyst. The catalyst adsorption test was undertaken in the dark, and the catalyst activity test for photodegradation of methylene blue was conducted under the sunlight. The XRD diffractogram of as prepared (Ni-Cu)Ox@SiO2 shows a weak-wide peak at 2θ = 21.8° indicating SiO2 tridymite, and has a crystallite size of 10.38 nm. The combination method of SEM and EDX confirms the formation of (Ni-Cu)Ox@SiO2. The (Ni-Cu)Ox@SiO2 catalyst has a relatively low bandgap energy and shows a good activity for photodegradation of blue methylene under sunlight. The adsorption of the methylene blue on the (Ni-Cu)Ox@SiO2 follows the Langmuir isotherm pattern.
Tujuan dari penelitian ini adalah diperoleh suatu metode standarisasi warna yaitu penilaian secara konsisten terhadap warna yang dibentuk oleh pewarna alami secang, sehingga dapat dijadikan acuan warna zat pewarna alami batik yang dibuat. Tahapan standarisasi pewarna alami dimulai dengan pemeriksaan taksonomi/determinasi, preparasi pewarna secang dengan cara ekstraksi, proses standarisasi yang meliputi proses standarisasi pewarna alami dan pembuatan standar pewarna sintetis sebagai pembanding, penetapan standar warna, aplikasi zat warna terstandar pada proses pembatikan meliputi pembuatan pola batik dan pembatikan dengan lilin/malam dan proses pewarnaan batik dengan pewarna secang. Analisis data dilakukan secara kualitatif dan kuantitatif terhadap data absorbansi dan panjang gelombang yang diperoleh dari warna merah yang dibentuk oleh pewarna secang. Hasil penelitian menunjukkan bahwa panjang gelombang serapan maksimum standar warna merah diperoleh pada 450,20 nm. Panjang gelombang inilah yang digunakan sebagai standar pengukuran warna merah secang yang diterapkan.(THE DEVELOPMENT OF STANDARDIZATION NATURAL COLOUR FROM BATIK OF STEAM BARK (Caesalpinia sappan L) BY SPECTROSCOPHY METHOD)The purpose of this research is to obtain a method of color standardization which is a consistent assessment of the color formed by secang natural dye, so it can be used as a reference color of natural dyes of batik.Standardization steps of natural dyes included taxonomic examination, preparation of secang dye by extraction, standardization process by spectroscopic measurement, with “rapid” dye as standard, application on batik process including batik pattern making and wax application on batik and batik coloring process with secang dye. Data was analized by absorbance vs wavelength obtained from red color formed by secang dye. The results showed that the maximum absorption wavelength of the standard red color was obtained at 450.20 nm. This value is used as the standard red color measurement
This research aims to synthesize Mg/Al hydrotalcite with mole ratio variations of Mg/Al precursor through low supersaturated precipitation method. Mg/Al hydrotalcite was synthesized with Mg/Al mole ratio variation of 1:1, 2:1, 3:1, and 4:1. Mg/Al hydrotalcite was synthesized using NaOH and Na 2 CO 3 base solutions. The mixture of precursor was stirred for 2 hours then treated by hydrothermal at 100 °C for 4 hours. Results of the synthesis Mg/Al hydrotalcite with mole ratio variations is a white powder. The formation of the structure of Mg/Al hydrotalcite showed by certain peaks in the FTIR spectra and XRD diffractogram.The results of data analysisshowed that variation of mole ratio Mg/Alcauses a shift of peak in the XRD diffractogram shifted towards the left along with a comparative increase in mole ratio Mg/Al, but the main functional groups on the compound Mg/Al hydrotalcite increasingly formed with better.
Modification of Nylon fabrics with HDTMS compound and silver nanoparticles which prepared via bio-reduction method using banana peel extract (Musa paradisiaca Linn.) has been conducted in this research. That modification can increase the quality of Nylon fabrics so they have antibacterial and self-cleaning properties. The types of Nylon fabrics in this research are Nylon fabric (Ny0), Nylon-Ag (Ny1), Nylon-HDTMS (Ny2), Nylon-Ag-HDTMS (Ny3), and Nylon-HDTMS-Ag (Ny4). The silver nanoparticles were characterized by using spectrophotometry of UltraViolet-Visible. Antibacterial activity against gram-positive and gram-negative bacteria was analyzed by measuring the clear zone around the sample. While the contact angle test was performed by the sessile drop method. Silver nanoparticles have a maximum peak at the wavelength of 440.50 nm. Nylon-Ag shows the highest antibacterial activity against E.coli and S. aureus. The inhibition zone of Nylon-Ag at 54 hours of incubation time is 97 times higher than the inhibition zone of Nylon without modification at 24 hours of incubation against E.coli. Likewise, with the inhibition capacity of Nylon-Ag in inhibiting the growth of S. aureus, Nylon-Ag has antibacterial activity at 72 hours incubation time of 85 times higher than Nylon at 48 and 72 hours incubation. However, Nylon-HDTMS-Ag has the greatest contact angle, that was 110.63 o
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