Titin Anita Zahara, Titin Anita
Jurusan Kimia, Fakultas MIPA, Universitas Tanjungpura, Pontianak

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Adsorption Capacity of Mercury Using Sargassum crassifolium Activated Adsorbent Silalahi, Imelda H; Zahara, Titin Anita; Tampubolon, Henry Martua
Biopropal Industri Vol 3, No 1 (2012)
Publisher : Balai Riset dan Standardisasi Industri Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (339.335 KB)

Abstract

This study aims to determine the maximum adsorption capacity of Hg using activated Sargassum crassifolium adsorbent. Sargassum crassifolium was activated by protonation using sulfuric acid (H2SO4) 1 M followed by heating for 24 hours at 100OC. Optimum conditions of adsorption was discovered through various of pH and contact time to the Hg(II) concentration decrease. The analysis showed that the optimum pH was 7 and contact time was 60 minutes. Finally the maximum adsorption capacity of Hg(II) using activated Sargassum crassifolium adsorbent was 2,90 mmol/g determined by Langmuir Isotherm equation.
Cadmium Adsorption on Chitosan/Chlorella Biomass Sorbent Prepared by Ionic-Imprinting Technique Shofiyani, Anis; Narsito, Narsito; Santosa, Sri Juari; Noegrohati, Sri; Zahara, Titin Anita; Sayekti, Endah
Indonesian Journal of Chemistry Vol 15, No 2 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (390.111 KB) | DOI: 10.22146/ijc.21210

Abstract

Ionic-Imprinted Chitosan/Chlorella biomass sorbent (IICCb) has been synthesized for selective adsorption of Cd(II) adsorption. IICCb was prepared by coating Cd(II)-complexed-chitosan hydrogel on the biomass surface followed by cross-linking procedure. Cd(II)-imprinting ions were then eluted using Na2EDTA solution to provide a specific template for binding sites of Cd(II). Batch adsorption was carried out as function of initial pH, contact time, and initial concentration of the Cd(II) solution. Result showed that the optimum adsorption of Cd(II) was found at pH 4-6. Study of pseudo-second order kinetic showed that the adsorption of Cd(II) on IICCb went faster than that on Ionic-Imprinted Chitosan (IIC) or Non-Imprinted Ionic Chitosan/Chlorella sorbent (NIICCb). The maximum Cd(II) adsorption capacity as obtained from Langmuir adsorption isotherm was found to be 53.76 mg/g on IICCb, that was comparatively higher than that on IIC (44.44 mg/g) or on NIICCb (51.02 mg/g) adsorbent.
BIOADSORPSI Fe(II) OLEH KULIT BUAH JERUK Citrus nobilis Lour. var microcarpa TERMODIFIKASI Ca(OH)2 Fatmawati, Norvi; Usman, Thamrin; Zahara, Titin Anita
Indonesian Journal of Pure and Applied Chemistry Vol 1, No 3 (2018): Vol 1, No 3 (2018)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (725.029 KB) | DOI: 10.26418/indonesian.v1i3.34205

Abstract

Pontianak peel fruit waste contains pectin, cellulose, and hemicellulose which can be used as heavy metal adsorbents by modifying using Ca(OH)2. The purpose of this study was to determine the physicochemical characteristics of calcium-modified Pontianak Citrus adsorbents (JeP-Oca), determine the maximum capacity of Fe(II) adsorption by JeP-OCa, and JeP-OCa adsorption kinetics. The characteristics of the adsorbent were analyzed using the Fourier Transformation Infra Red (FTIR) showing the functional groups of –OH and -COOH, Electron Scanning (SEM) Microscopy showing the surface structure of the canal and many irregular niches. The adsorption isotherm method with the BET model showed a large difference in porous surface area, namely 104.872 m2/g for JeP, 242.649 m2/g for JeP-ONa and 3759.745 m2/g for JeP-OCa. Optimization of the influence of pH, adsorbent mass, adsorbate concentration, and time using the column method. Adsorption isotherm followed the Freundlich isotherm model with maximum adsorption capacity value of 22.7272 mg/g. Fulfill the pseudo-order 2 reaction kinetics with a rate constant value of 4.097 L/mg. Min. The adsorption application using groundwater resulted in absorption efficiency of 82.99%.
SEMIKONDUKTOR BERBASIS TiO2-N/KAOLIN TERKALSINASI UNTUK DYE SENSITIZED SOLAR CELL (DSSC) Amir, Sabrina Maulidya; Zahara, Titin Anita; Sasri, Risya; Rahmalia, Winda
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 1 (2019): Vol 2, No 1 (2019)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3697.056 KB) | DOI: 10.26418/indonesian.v2i1.36944

Abstract

Semikonduktor TiO2 sebagai anoda dalam dye sensitized solar cell (DSSC) memiliki kelemahan yaitu hanya aktif bekerja pada radiasi sinar UV karena energi celah pita (Eg) TiO2 yang relatif besar yaitu 3,2 eV. Pada penelitian ini, dilakukan modifikasi untuk mengubah struktur elektronik TiO2, agar dapat menurunkan Eg. Dalam penelitian ini, TiO2 didoping menggunakan atom N dari NH4OH dan kaolin terkalsinasi (KT) yang disintesis dari kaolin Capkala. Beberapa parameter yang dibahas yaitu karakteristik TiO2-N/KT hasil pendopingan, penurunan energi celah pita dari semikonduktor, dan hubungan antara Eg dari semikonduktor terhadap randemen konversi energi maksimum DSSC yang dihasilkan. Dye yang digunakan dalam penelitian ini adalah ekstrak kayu secang. Difraktogram XRD TiO2-N/KT menunjukkan posisi 2? = 25,2790o yang menunjukkan keberadaan TiO2 dan 2? = 26,6090oyang menunjukkankeberadaan SiO2 dari kaolin terkalsinasi. Analisis dengan FTIR menunjukkan penyerapan pada bilangan gelombang 680 cm-1 yang menunjukkan vibrasi ikatan Ti-N dan 1036,77 cm-1 yang menandakan bahwa adanya vibrasi regangan asimetris O-Si-O dan O-Al-O. Terjadi penurunan Eg dari 3,2 eV (TiO2 murni) menjadi  3,03 eV (TiO2-N/KT). Penurunan energi celah pita sebanding dengan besarnya randemen konversi energi maksimum dari sel surya yang dihasilkan yaitu sebesar 1,048 %, menunjukkan performansi lebih baik dibanding dengan DSSC dengan komponen anoda TiO2 murni (0,661%)
ADSORPSI ASAM LEMAK BEBAS DALAM MINYAK SAWIT MENTAH MENGGUNAKAN ADSORBEN ABU TANDAN KOSONG SAWIT Syahwandi, M; Rahmalia, Winda; Zahara, Titin Anita; Usman, Thamrin
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 3 (2019): Vol 2, No 3 (2019)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (697.167 KB) | DOI: 10.26418/indonesian.v2i3.36894

Abstract

Research on the use of the oil palm empty fruit bunch (OPEFB) as an adsorbent for free fatty acid (FFA) adsorption on Crude Palm Oil (CPO) has been done. CPO is the main raw material in the manufacture of food products. The results of OPEFB adsorbent characteristics showed the amount of water content and ash content of 0,067% and 0,175%, XRF analysis obtained the greatest content of OPEFB in the form potassium metal as much as 44,24%, FTIR analysis identified that there were CO3 compounds in wave number 1648 cm-1 and SEM analysis indicates there are no pores in OPEFB. The result showed that the number of OPEFB with the best adsorption was 0,1 gram with 60 minute optimum contact time. The CPO adsorption process with OPEFB shows the Langmuir model with a correlation value (R2) of 0,8845 and the adsorptions kinetics follows the pseudo order 2 adsorption kinetics model with a correlation value (R2) of 0,9857. The results of this study showed the characteristics of CPO before and after adsorbed using 0,1 g of adsorbent OPEFB showed the amount of FFA level of 7,321% to 6,297%, water content of 0,0025% to 0,00119% and impurities content of 0,8847% to 0,8408%.
KARAKTERISASI MINYAK ATSIRI DAUN UJUNG ATAP (Baeckea Frutesces L) DARI HUTAN DESA SUNGAI NANJUNG KABUPATEN KETAPANG KALBAR Supandi, M; Wibowo, Muhammad Agus; Zahara, Titin Anita
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 2 (2019): Vol 2, No 2 (2019)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2821.916 KB) | DOI: 10.26418/indonesian.v2i2.36911

Abstract

Ujung atap (Baeckea frutescens L) from Myrtaceae family is a woody shrub which leaves resemble a large evergreen tree found from Nanjung River Village, Ketapang Regency, West Kalimantan.  The purpose of this study is to isolate and characterize essential oils of ujung atap. Insulation is used by the distillation method. The result showed rendement of ujung atap the essential oils are 0,91% (4 hours), 0,97% (6 hours) dan 1,12% (7 hours). Essential oils are tested physicochemistry properties and components of chemistry compound analyzed with GC-MS. The result showed density is 0,878 (room temperature), refractive index is 1,474 (28oC), optical rotation is +2,24(20oC), solubility in alcohol is 1:8 mL, acid number 1,253, dan ester number 3,829. The result of GC-MS showed 21 compound, with the main compound monoterpenes are ?-pinene, ?-pinene and 1,8 cineol.