Dinamika Hidrasi Cerium (III) Dalam Larutan Berdasarkan Simulasi Dinamika Molekul

Penelitian tentang sifat dinamika hidrasi ion Ce3+ berdasarkan simulasi dinamika molekul telah dilakukan. Metode simulasi yang digunakan adalah simulasi dinamika molekul ab initio Quantum Mechanical Charge Field (QMCF). Metode ini membagi kotak simulasi menjadi 2 bagian. Bagian pertama yang meliputi lapisan hidrasi pertama dan kedua, dihitung dengan metode mekanika kuantum ab initio pada tingkatan teori Hartree–Fock (HF). Himpunan basis yang digunakan pada perhitungan mekanika kuantum untuk ion Ce3+ dan molekul air adalah SBKJC VDZ ECP dan DZP Dunning secara berurutan. Bagian kedua, di luar bagian pertama, dihitung dengan metode perhitungan mekanika klasik. Hasil penelitian menunjukkan bahwa ion Ce3+ memiliki lapisan hidrasi yang fleksibel pada lapisan hidrasi pertama dan kedua

Membran Komposit Ca-ps Pemisah Limbah Batik (Rhodamine B) Dengan “Dead-end” Membrane Reactor

The development of membrane technology as a waste treatment unit is currently very rapidly and widely used in the separation process, such as batik waste (rhodamine B). The purpose of this research is to make a composite membrane of cellulose acetate derived from banana peel fermentation with polystyrene and determine its application in waste separation process of batik waste (rhodamine B). The method of making the membrane is phase inversion, i.e the process of a polymer modified in a controlled manner from liquid phase to solid phase. This research begins with manufacturing of cellulose (nata de banana skin) through fermentation by Acetobacter xylinum. The second stage is acetylation process of cellulose into cellulose acetate. The next stage is manufacturing composite membranes CA-PS and its application in batik waste (rhodamine B) separation process with the application on "dead-end" reactor. Characterization of CA-PS composite membrane has been done with the determination of flux, rejection coefficient, tensile strength and strain as well as the morphology and pore size of the membrane using SEM. The measurement results obtained the water flux are of 4.3889 L / (m2.h) and sample flux are 1.4629 L / (m2.h), rejection coefficient are 16%, tensile test are 10.38 MPa, and the average pore size are 5.114 µm. Key words: cellulose acetate, nata, rhodamine B, CA-PS, dead-end