This research aims to investigate photocells reactor design can convert indoor lights energy into

Metode keadaan padat (Solid Stated) merupakan suatu cara yang dilakukan dengan mereaksikan padatan dengan padatan lainnya dengan suhu yang tinggi. Metode ini dapat digunakan untuk mensintesis material baik organik maupun anorganik. Sintesis material adalah suatu integrasi beberapa material untuk menghasilkan material baru. Pada metode solid stated terdapat beberapa langkah dalam mensintesis material yaitu penggerusan sampel, kompaksi sampel, kalsinasi sampel, sintering sampel, dan terakhir sampel dikarakterisasi.

ABSTRACT

It has been studied to determine the effect of temperature and particles motion of zinc oxide semiconductor from commercial ZnO powder on phototransformation of humic acid, using B & L 20 Spectronics. This study was done under some optimum conditions: lighting time of 2 hours, using Hg lamp of low pressure ( λ = 254 nm), humic acid of 100 ppm and pH=9.2. it was disclosed that 97.51 % of humic acid transformed into minerals product. This research can contributed to solve the environmental problems in peat water.

Chemical Vapor Deposition merupakan metode deposisi yang digunakan untuk menghasilkan bahan padat berkualitas tinggi dan berkinerja tinggi yang biasanya dibawah vakum. Tujuan review ini adalah untuk mengetahui proses dan teknik dari Chemical Vapor Deposition. Prinsip kerja dari Chemical Vapor Deposition yaitu proses pengendapan senyawa/ unsur terjadi akibat reaksi dekomposisi kimia akibat aktivasi termal di seputar komponean yang dilapisi. Beberapa material yang dihasilkan dengan menggunakan metode Chemical Vapor Deposition ini adalah berlian sintesis, thin film coating, lapisan emas dengan ketebalan yang tipis.

Metode sol gel merupakan salah satu metoda sintesis nanopartikel yang menerapkan 2 tahapan fasa penting yaitu sol dan gel. Tujuan review ini adalah untuk mengetahui prinsip dan teknik pada proses pembuatan sol gel. Prinsip metoda sintesis dengan teknik sol gel ini adalah pembentukan senyawa awal ( prekursor ) yang terdiri dari garam-garam organik atau senyawa metal organik, terjadinya polimerisasi larutan, terbentuknya, dan membutuhkan proses pengeringan dan kalsinasi untuk menghilangkan senyawa organik serta membentuk material anorganik berupa oksida. Beberapa material yang dihasilkan dengan menggunakan metode sol gel ini adalah ceramic fibers, thin film coating, monolithic ceramics and glasses.

Spirulina platensis is a unicellular microalgae that has high nutritional value such as proteins, carbohydrates, lipids and carotenoids like β-carotene. The microalgae rapidly grows in Bold Bassal Medium modification and high intensity of light. The aims of this research were to optimize the culture growth and determine antioxidant activity of S. platensis. Culture was optimized by adding urea and NaHCO3 I nto the medium and applying dark : light period (12:12 h/h) under solar or fluorescent light (3000 lux). The optimum growth of Spirulina platensis was in 0,3 g/L urea, pH 9 at fluoresense light (3000 lux). Antioxidant acivity of various spirulina extract was studied by 1,1diphenyl-2-picryl-hydrazyl (DPPH) free radicals scavenging method. The Spirulina radicals scavenging activity of acetone : methanol (1:1) extract was 46,39 %. The acetone:methanol (1:1) extract showed better antioxidant activity than acetone extract. The β-carotene was determined using HPLC in a silica gel column with dichloromethane, acetonitrile, methanol (20:70:10, v/v/v) as a mobile phase. The acetone extract displayed the highest sample area and produced 1.32% of β-carotene out of total biomass.

This research aims to investigate process and mechanism of splitting water by illumination copper oxide using indoor lights. We report here an innovative approach, in which the lights are used from low energy and rarely never using in general photovoltaic system. The illumination is monitoring with high resolution CMOS Camera, 13 MPixel of OPPO X9006, to capture image of spliiting water. Splitting of water to produce hydrogen due on the Carbon (Graphite) electrode surface with electricity current from Cu 2 O/Al PV Cell and Na 2 SO 4 electrolyte. Tandem of PV cell and Electrolysis Cell (PV-EC) produce Hydrogen gas, in which electric current is 4.27 Voltage and 0.920 mA in Na 2 SO 4 0.5 N optimal condition. PV Cell use Cu 2 O/Al as electrode with surface area 0.003711 m 2 . With eleven PV cell series arrangement (surface area = 0.018555m 2 ), produce voltage 4,27V (this voltage was exceed minimum voltage for water splitting with voltage 4,27V) and current 0.910 mA. The process of water splitting observed at initiation of formation H 2 gas and H 2 release at carbon surface. After 1 hour and 50 minutes, H 2 gas volume produced reach 0.00281 mL.