The Relationship of Knowledge Level of Cosmetics with Avoidance Behavior Against Cosmetics Containing Rhodamine-B.

Kosmetik merupakan kebutuhan yang telah lama digunakan dan dikembangkan oleh manusia. Seiring perkembangan zaman penggunaan kosmetikkian meningkat, Mahasiswi sebagai konsumen yang menggunakan produk kosmetika seharusnya memiliki pengetahuan yang baik mengenai kosmetika. Kosmetika yang beredar di pasaran sangat beragam baik merek, jenis, kegunaannya, maupun warna dan bentuknya. Penelitian ini bertujuan untuk Mengetahui Hubungan pengetahuan dengan perilaku menghindari Kosmetika yang mengandung Rhodamin-B. Penelitian ini menggunakan metode penelitian deskriptif dengan pendekatan korelasional serta sampel penelitian ini adalah Mahasiswa Pendidikan Tata Rias angkatan 2018 berjumlah 30 dengan menggunakan random sampling. Data yang digunakan adalah data primer yang didapatkan melalui kuesioner. Uji persyaratan analisis yang digunakan dalam penelitian ini adalah Uji Normalitas Kolmogorov-Smirnov yang menunjukkan nilai probabilitas (Sig.) sebesar 0,080 untuk variabel pengetahuan kosmetika (X) dan 0,198 untuk variabel perilaku menghindari kosmetika yang mengandung Rhodamin-B (Y) perolehan kedua skor tersebut didapat > 0,05 taraf signifikan, sehingga kedua variabel dapat dinyatakan berdistribusi normal. Pengujian hipotesis pada penelitian ini menggunakan uji koefisien korelasi product moment dan uji keberartian koefisien korelasi. Hasil menunjukkan r hitung sebesar 0,625, yang artinya lebih besar dari r tabel yaitu 0,361, yang berarti Ho ditolak dan Ha diterima.Nilai korelasi sebesar 0,625 menunjukkan korelasi yang kuat, hal ini mengacu terhadap Tingkatan Koefisien Korelasi. Dapat disimpulkan bahwa terdapat hubungan positif antara pengetahuan kosmetika dengan perilaku menghindari kosmetika yang mengandung Rhodamin-B.Cosmetics is a necessity that has long been used and developed by humans. Along with the development of the era of increasing use of cosmetics, female students as consumers who use cosmetic products should have good knowledge about cosmetics. Cosmetics on the market are very diverse in terms of brands, types, uses, as well as colors and shapes. This study aims to determine the relationship between knowledge and behavior to avoid Cosmetics containing Rhodamine-B. This study uses a descriptive research method with a correlational approach and the sample of this research is the Make-up Education Students, Class of 2018 with total 30 students using random sampling. The data used is primary data and collected through a questionnaire. The analytical requirements test used in this study is the Kolmogorov-Smirnov Normality Test which shows a probability value (Sig.) of 0.080 for the cosmetic knowledge variable (X) and 0.198 for the behavioral variable to avoid cosmetics containing Rhodamine-B (Y). obtained > 0.05 significant level, so that both variables can be declared normally distributed. Hypothesis testing in this study uses the product moment correlation coefficient test and the significance test of the correlation coefficient. The results show r arithmetic of 0.625, which means it is greater than r table of 0.361, which means Ho is rejected and Ha is accepted. The correlation value of 0.625 indicates a strong correlation, this refers to the Correlation Coefficient Level. It can be concluded that there is a positive relationship between knowledge of cosmetics and behavior to avoid cosmetics containing Rhodamine-B

Thermal stability effect of H4[PVMo11O40]/SiO2

Synthesis and characterization of supported polyoxometalate  H4[PVMo11O40].nH2O with SiO2 through sol-gel method have been done. The compound H4[PVMo11O40]/SiO2 was characterized through FT-IR spectrophotometer, XRD, and SEM-EDX. The results showed that FT-IR spectrum of H4[PVMo11O40]/SiO2 has the primary vibration on wavenumber at 1064.7 cm-1 (P-O); 964.4 cm-1 (Mo=O); 864.1  cm-1 (Mo-Oe-Mo); 779.2 cm-1 (Mo-Oc-Mo); 462.9 cm-1 (Si-O); and 1087.9 cm-1 (Si-O-Si). The XRD diffraction pattern showed that H4[PVMo11O40].nH2O has the highest crystallinity. However, after it’s supported with SiO2, the properties of crystallinity has decreased due to the excess water during the support process. The result of SEM-EDX showed that H4[PVMo11O40]/SiO2 material has homogeneous distribution with particle size distribution of 1330 nm (1,33 μm). The acidity test by qualitative and quantitative methods show that H4[PVMo11O40]/SiO2 more acidic than H4[PVMo11O40].H2O. The effect temperature on the crystallinity showed that increasing calcination temperature made the crystallinity properties of  H4[PVMo11O40]/SiO2 increased. Keywords : polyoxometalate, H4[PVMo11O40].nH2O, SiO2

Studi Interaksi Vanadium dan Nikel dengan Pasir Kuarsa

Pasir kuarsa alam telah dimurnikan dari pengotornya yakni oksida-oksida dan senyawa organik dengan menggunakan asam nitrat. Pasir kuarsa alam dikarakterisasi menggunakan spektrofotometer FT-IR. Selanjutnya pasir kuarsa alam digunakan sebagai adsorben untuk ion vanadium dan nikel. Interaksi antara pasir kuarsa alam dengan ion logam dipelajari melalui proses adsorpsi desorpsi. Hasil penelitian menunjukkan bahwa bahwa proses pencucian pasir kuarsa alam dapat menghilangkan pengotornya. Interaksi vanadium dan nikel dengan pasir kuarsa merupakan interaksi fisik, yang diketahui dari pola isoterm adsorpsinya. Hasil desorpsi juga memperkuat hasil bahwa interaksi antara ion logam dengan pasir kuarsa adalah interaksi fisik

Conversion of cyclohexane to cyclohexanol and cyclohexanone using H3[PMo12O40].nH2O-ZrOCl2 as catalyst

Synthesis and preparation polyoxometalate compound H3[-PMo12O40].nH2O supported with ZrOCl2 at various weights of ZrOCl2 i.e. 0.25 g, 0.50 g, 0.75 g, 1.00 g, 1.25 g, 0.01 g and 0.05 g to form H3[-PMo12O40].nH2O/ZrOCl2 have been conducted. These compound than was characterized through functional group analysis using FT-IR spectrophotometer and XRD analysis. The results showed that the optimal preparation was H3[-PMo12O40].nH2O/ZrOCl2  with support 0.05 g. FT-IR spectrum of H3[-PMo12O40].nH2O/ZrOCl2 show wavenumber at 1033.85 cm-1 for vibration P-O, 887.26 cm-1  for vibration M=O, 840.96 cm-1 and 655.80 cm-1   for vibration Mo-O-Mo. The existence of support was identified at wavenumber 1404.18 cm-1for vibration Zr-OH and 478.35 for vibration Zr-O-Zr. XRD powder analysis showed that material H3[-PMo12O40].nH2O/ZrOCl2 was amorphous material. Material H3[-PMo12O40].nH2O/ZrOCl2 was applied in oxidation of cyclohexane using hydrogen peroxide as oxidant. Oxidation process was optimized through reaction time H2O2 amount, temperature and catalyst weight. The results showed that the highest conversion in the using of H3[-PMo12O40].nH2O/ZrOCl2 catalyst found at 2 hours reaction time, 3 mL H2O2, 80oC temperature and 0.038 g catalyst with conversion 99.18 %. Selectivity of best reaction was 6.96 % for cyclohexanol and 24.9% for cyclohexanone, which was identified by GC-MS.           Keywords : H3[-PMo12O40].nH2O-ZrO2,cyclohexane, cyclohexanol, cyclohexanone