This research investigated the ability of Sago Bark (Metroxylon sago) to remove Pb(II) in aqueous solution using the batch method. The adsorption of Pb(II) with Sago Bark (Metroxylon Sago) reached the peak at pH 5, contact time 60 minutes, initial concentration 600 mg/L, agitation rate 100 rpm, adsorbent dose 0.1 g and adsorption capacity 31.4375 mg/g. The equilibrium of adsorption revealed that Langmuir isotherm model was fitted better to describe the adsorption of Pb(II) onto Sago Bark (Metroxylon sago) indicated by R 2 values at 0.8908 and 0.918 for Freundlich and Langmuir, respectively. Pseudo-second order yielded a good correlation (R 2 = 0.9979) of the experimental data. While the thermodynamic study showed a spontaneous with an endothermic process. SEM micrograph and FTIR spectrum indicated that porous surface covered by Pb(II) and the wavelength number shifting of hydroxyl and carbonyl groups from 3421.10 cm-1 to 3423.54 cm-1 and from 1734.16 cm-1 to 1718.65 cm-1 supported the adsorption of Pb(II) onto Sago Bark (Metroxylon sago).

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Various eggs shell membranes (ESMs) have been used as a separator for supercapacitor application. The separator was prepared from different membranes such as chicken eggs shell membrane (CESM), duck eggs shell membrane (DESM) and goose eggs shell membrane (GESM). The ESMs were tested as a separator in a two-electrode system, the sandwich-type supercapacitor cell consists of two activated carbon monoliths as electrodes, two stainless steel as current collectors and 1 M H2SO4 solution as an electrolyte. The electrochemical performance of the ESMs was characterized by an electrochemical impedance spectroscopy, a cyclic voltammetry and a galvanostatic charge-discharge. The results of this study exhibit all of the ESMs as a good candidate for supercapacitor separator. However, the CESM was shown excellence electrochemical properties, such as low resistance, high energy density and power density. The scanning electron microscope (SEM) micrograph and X-ray diffraction analysis were also proved that the ESMs are a promising low-cost separator for supercapacitor application.

Telah melakukan penelitian tentang pengaruh pencampuran abu ampas tebu dan produk pembakaran serbuk gergaji yang telah digiling halus dengan kekuatan mortar. Kedua bahan dicampur pada saat pencetakan mortar pasir sebanyak 0%, 5%, 10%, 15%, 20% dan 25% massa. Hasil penelitian menunjukkan peningkatan kekuatan tekan, kekuatan tarik, dan densitas dan penurunan porositas dan penyerapan air seiring dengan bertambahnya variasi campuran terhadap abu ampas tebu dan pembakaran produk serbuk gergaji hingga mencapai hasil yang optimal. Hasil optimum pencampuran abu ampas tebu adalah dalam campuran ini variasi 15%, sedangkan hasil yang optimal dari produk pembakaran serbuk gergaji adalah dalam campuran variasi 10 %.

Copper oxide particles were electrodeposited onto indium tin oxide (ITO) coated glass substrates. Electrodeposition was carried out in the electrolyte containing cupric sulphate, boric acid and glucopone. Both continuous and pulse currents methods were used in the process with platinum electrode, saturated calomel electrode (SCE) and ITO electrode as the counter, reference and working electrode respectively. The deposited particles were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that, using continuous current deposition, the deposited particles were mixture of Cu2O and CuO particles. By adding glucopone in the electrolyte, particles with spherical shapes were produced. Electrodeposition by using pulse current, uniform cubical shaped Cu2O particles were produced