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STUDI KAPASITAS ADSORPSI-REDUKSI ION Au(III) PADA ASAM HUMAT HASIL ISOLASI DARI TANAH GAMBUT RAWA PENING Prasasti, Dian; Juari, Sri; Sudiono, Sri
PHARMACIANA Vol 2, No 2: November 2012
Publisher : PHARMACIANA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (82.03 KB)

Isolasi asam humat dan aplikasinya untuk adsorpsi-reduksi ion Au(III) telah dilakukan. Asam humat diisolasi dari tanah gambut yang diambil dari Rawa Pening, Jawa Tengah. Isolasi asam humat dari tanah gambut didasarkan pada metode ekstraksi tradisional basa. Isolasi asam humat dilakukan dengan mengekstraksi asam humat dari tanah gambut dengan 0,1 M NaOH dan mengendapkan dengan 0,1 M HCl kemudian dilakukan pencucian dengan 0,1 M HCl/0,3 M HF 1/1. Asam humat dikarakterisasi dengan spektroskopi Fourier-Transform Infrared (FTIR) kemudian diaplikasikan untuk adsorpsi-reduksi ion Au(III). Kapasitas adsorpsi menggunakan model isoterm adsorpsi terhadap proses adsorpsi reduksi ion Au(III) juga telah dipelajari. Logam Au yang terbentuk dikonfirmasi dengan difraktogram XRD dan foto mikroskop optik. Hasil perhitungan kapasitas adsorpsi dengan model isotherm Langmuir asam humat adalah 192 mg/g. Pembentukan logam Au ditunjukkan oleh munculnya puncak pada 2_ = 38, 44, dan 64 dalam difraktogram XRD.

KINETIKA ADSORPSI-REDUKSI ION Au(III) PADA ASAM HUMAT HASIL ISOLASI DARI TANAH GAMBUT RAWA PENING Prasasti, Dian; Juari, Sri; Sudiono, Sri
Pharmaciana Vol 3, No 2 (2013): Pharmaciana
Publisher : Universitas Ahmad Dahlan

Isolation of peat soil humic acid and its application for adsorption reduction of Au(III) have beenconducted. Humic acid was isolated from peat soil that was collected from Rawa Pening, Central Java. Isolation ofhumic acid from peat soil was based on conventional alkaline extraction method. Humic acid was extracted frompeat soil with NaOH 0.1 M, then precipitated with 0.1 M HCl, and purified with 0.1 M HCl/0.3 M HF 1/1. Theisolated humic acid was characterized by FTIR spectroscopy, then applied for adsorption and reduction process ofAu (III).Adsorption kinetics on adsorption reduction process of Au (III) also were studied. The gold metal formedwas confirmed by XRD diffractogram, and photo optical microscope. The adsorption rate constant (k) withSantosa kinetics model for humic acid is 0.0065 min-1.Peaks of gold particles in the difractogram are 2 = 38, 44,and 64.

STUDI KAPASITAS ADSORPSI-REDUKSI ION Au(III) PADA ASAM HUMAT HASIL ISOLASI DARI TANAH GAMBUT RAWA PENING Prasasti, Dian; Juari, Sri; Sudiono, Sri
Pharmaciana Vol 2, No 2 (2012): Pharmaciana
Publisher : Universitas Ahmad Dahlan

Isolation of peat soil humic acid and its application for adsorption-reduction ofAu(III) have been conducted. Humic acid was isolated from peat soil that was collectedfrom Rawa Pening, Central Java. Isolation of humic acid from peat soil was based onconventional alkaline extraction. Humic acid was extracted from peat soil with NaOH0.1 M, then precipitated with 0.1 M HCl, and purified with 0.1 M HCl/0.3 M HF 1/1.The isolated humic acid was characterized by FTIR spectroscopy, then applied foradsorption reduction of Au(III). Isothermic adsorption capacity on adsorptionreduction process of Au (III) also were studied. The gold metal formed was confirmedby XRD diffractogram, and photo optical microscope. The adsorption capacity withLangmuir isothermic model for humic acid was 192 mg/g. Peaks of gold particles in thedifractogram are 2 = 38, 44, and 64.

UTILISASI TiO2-ZEOLIT DAN SINAR UV UNTUK FOTODEGRADASI ZAT WARNA CONGO RED Karna Wijaya; Eko Sugiharto; Is Fatimah; Sri Sudiono; Diyan Kurniaysih
Teknoin Vol. 11 No. 3 (2006)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v11i3.88

An investigation of Congo Red photodegradation using TiO2-Zeolite and UV radiation was performed. TiO2-Zeolite was prepared by dispersing of pillaring solution (in form oligocations of titanium) into suspension of Zeolite. The suspension was stirred and then filtered to separate the solid phase from the filtrate. the solid phase was calcined by microwave oven at 800 Watt for 5 minutes to convert the oligocations into its oxide forms. The calcined product and unmodified Zeolite were characterized using x-ray diffractometry, FT-IR spectrophotometry, X-ray fluorescence and gas sorption analysis to determine their physicochemical properties. Photocatalytic activity of TiO2-Zeolite was tested on Congo Red using following method: 50 mg of Zeolite was dispersed into 25 mL of 10-4 M Congo Red. The dispersion was irradiated using 365 nm UV light at room temperature on various irradiation times, i.e. 10,20,30,40 and 60 minutes. At certain irradiation time, the dispersion was filtered and the filtrate was then analyzed its concentration using UV-vis spectrophotometry method. Characterization results exhibited that the formation of TiO2 on internal as well as external surfaces of Zeolite could not be detected with x-ray diffractometry and FT-IR spectrophotometry, however determination of titanium using x-ray fluorescence analysis on the calcined product showed that the concentration of titanium was much higher than Zeolite (0.22% on Zeolite and 12.08% on TiO2-Zeolite). Gas sorption analysis result indicated that the the calcination resulted in the increase of specific surface area (16,31 m2/g on Zeolite and 100,96 m2/g on TiO2-Zeolite) as well as total pore volume of calcined product (13,34 mL/Å/g on Zeolite and 57,54 mL/Å/g on TiO2-Zeolite). Photocalytic activitiy test result conducted on that dye showed that ca 99 % of Congo Red was degraded by the system TiO2-Zeolite after UV irradiation for 60 minutes.Keywords: TiO2-Zeolite, photocatalytic, UV-irradiation, Congo Red

PREPARASI, MODIFIKASI DAN KARAKTERISASI KATALIS NI-MO/ZEOLIT ALAM DAN MO-NI/ZEOLIT ALAM Wega Trisunaryanti; Endang Triwahyuni; Sri Sudiono
Teknoin Vol. 10 No. 4 (2005)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v10i4.105

Preparations and modifications of Ni-Mo/natural zeolite and Mo-Ni/natural zeolite catalysts as well as their characterizations had been carried out. The preparations of catalysts were carried out by reacting a natural zeolite produced in Wonosari with the precursor of Ni(NO3)2.9H2O and Mo(NH4)7.6H2O. The modifications were performed by varying the rasio of Ni/Mo whereas the Mo was previously loaded to the zeolite or Mo/Ni ratio whereas the Ni was previously loaded and the total metal content was 1 wt.% based on the zeolite. The aim of this research for the fututure is to prepare catalysts with high acidity and crystallinity for the conversion of waste plastics fraction to gasoline fraction (C5-C12 hydrocarbons). The characterization of catalysts included determination of metal content using Atomic Adsorption Analysis (AAS), acidity by adsorption of ammonia or pyridine vapour base method, and crystallinity by X-ray Diffraction (XRD). The treatment of catalysts using Etilene Diamine Tetra Acetic acid (EDTA) was performed to study the metal distribution on the outer or inner surface of the zeolite. The characterization results showed that the loading of Ni and Mo to the zeolite produced higher acidity catalysts than those of monometal loaded catalysts. The increase of Ni loaded caused the decrease of catalysts acidity, on the other hand, the increase of Mo loaded caused the increase of catalysts acidity. The metals loaded on the zeolite were distributed inside the pore and at outer surface of the zeolite. For all catalyst samples, the acidities determined using ammonia were higher than those of pyridine, and the acidities determined before the EDTA treatment was lower than those after the treatment. The metals loading on the zeolite did not defect its crystallnity. Metal contents of the zeolite before the EDTA treatment were higher than those after the treatment. The relationship between the metal ratios towards the catalyst acidity was varying. The EDTA treatment to the zeolite sample enhanced the crystallinity of the sampel. Catalyst samples produced in this research have high acidities and crystallinities, thus promisingly can be used for conversion process of waste plastics to gasoline fraction. Keywords : natural zeolite, acidity, Ni-Mo/natural zeolite, Mo-Ni/natural zeolite, crystallinity, EDTA

STUDI KAPASITAS ADSORPSI-REDUKSI ION Au(III) PADA ASAM HUMAT HASIL ISOLASI DARI TANAH GAMBUT RAWA PENING Dian Prasasti; Sri Juari; Sri Sudiono
Pharmaciana Vol 2, No 2 (2012): Pharmaciana
Publisher : Universitas Ahmad Dahlan

Isolation of peat soil humic acid and its application for adsorption-reduction ofAu(III) have been conducted. Humic acid was isolated from peat soil that was collectedfrom Rawa Pening, Central Java. Isolation of humic acid from peat soil was based onconventional alkaline extraction. Humic acid was extracted from peat soil with NaOH0.1 M, then precipitated with 0.1 M HCl, and purified with 0.1 M HCl/0.3 M HF 1/1.The isolated humic acid was characterized by FTIR spectroscopy, then applied foradsorption reduction of Au(III). Isothermic adsorption capacity on adsorptionreduction process of Au (III) also were studied. The gold metal formed was confirmedby XRD diffractogram, and photo optical microscope. The adsorption capacity withLangmuir isothermic model for humic acid was 192 mg/g. Peaks of gold particles in thedifractogram are 2 = 38, 44, and 64.

KINETIKA ADSORPSI-REDUKSI ION Au(III) PADA ASAM HUMAT HASIL ISOLASI DARI TANAH GAMBUT RAWA PENING Dian Prasasti; Sri Juari; Sri Sudiono
Pharmaciana Vol 3, No 2 (2013): Pharmaciana
Publisher : Universitas Ahmad Dahlan

Isolation of peat soil humic acid and its application for adsorption reduction of Au(III) have beenconducted. Humic acid was isolated from peat soil that was collected from Rawa Pening, Central Java. Isolation ofhumic acid from peat soil was based on conventional alkaline extraction method. Humic acid was extracted frompeat soil with NaOH 0.1 M, then precipitated with 0.1 M HCl, and purified with 0.1 M HCl/0.3 M HF 1/1. Theisolated humic acid was characterized by FTIR spectroscopy, then applied for adsorption and reduction process ofAu (III).Adsorption kinetics on adsorption reduction process of Au (III) also were studied. The gold metal formedwas confirmed by XRD diffractogram, and photo optical microscope. The adsorption rate constant (k) withSantosa kinetics model for humic acid is 0.0065 min-1.Peaks of gold particles in the difractogram are 2 = 38, 44,and 64.

The Influence of Metal Loading Amount on Ni/Mesoporous Silica Extracted from Lapindo Mud Templated by CTAB for Conversion of Waste Cooking Oil into Biofuel Cahyarani Paramesti; Wega Trisunaryanti; Savitri Larasati; Nugroho Raka Santoso; Sri Sudiono; Triyono Triyono; Dyah Ayu Fatmawati
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 1 Year 2021 (March 2021)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.1.9442.22-30

The synthesis and characterization of Ni/mesoporous silica (Ni/MS) catalysts from Lapindo mud with various metal loading for the hydrocracking of waste cooking oil into biofuel has been conducted. The MS was synthesized by the hydrothermal method using CTAB as a template. The nickel-metal of 4, 6, and 8 wt% was loaded into the MS using salt precursors of Ni(NO3)2.6H2O via wet impregnation, produced the Ni(4)/MS, Ni(6)/MS, and Ni(8)/MS catalysts, respectively. The materials produced were then characterized by X-ray Powder Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FT-IR), and Surface Area Analyzer (SAA), and Absorption Atomic Spectrophotometry (AAS). The catalytic activity test was carried out for hydrocracking of waste cooking oil and the resulted liquid product was analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). The results showed that the specific surface area of Ni(4)/MS, Ni(6)/MS, and Ni(8)/MS catalysts are 63.08, 91.45, and 120.45 m2/g, respectively. The liquid products of the hydrocracking using Ni(4)/MS, Ni(6)/MS, and Ni(8)/MS catalysts were 80.57, 74.63, and 75.77 wt%, where the total biofuel produced was 55.46, 50.93, and 54.05 wt%, respectively. Based on these results, Ni(4)/MS material was successfully used as the most potent catalyst in the hydrocracking of waste cooking oil into the biofuel. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Studi Kinetika Adsorpsi Ion Au(III) Menggunakan Kulit Buah Manggis (Garcinia mangostana L.) Mellia Harumi; Faisal Shaleh; Sri Sudiono; Triyono Triyono
Praxis : Jurnal Sains, Teknologi, Masyarakat dan Jejaring Vol 2, No 2: Maret 2020
Publisher : Soegijapranata Catholic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24167/praxis.v2i2.2600

Adsorption using biosorbent become an alternatif for recovery heavy metals such as gold from electronic waste. Mangosteen rind can adsorp Au(III) ions in acid condition pH 2 optimally. Kinetics study of Au(III) ions adsorption using mangosteen rind was aim to determine adsorption kinetics model, adsorption rate constanta (k) and activation energy (Ea) Au(III) ions using mangosteen rind. Adsorbent. Adsorbent preparation was carried out using maceration methof for activate adsorption functional group and remove contaminant materials. Au(III) ions adsorption was analyzed by varying temperature and time. Adsorbed Au(III) was determined using Atomic Adsorption Spectroscopy (AAS) and characterized using Fourier Transform Infra Red (FTIR) Spectroscopy dan X-Ray Diffraction (XRD) Spectroscopy. The result proved that KBM adsorbent could adsorp Au(III) ions effectivelly and follow Ho pseudo-second order kinetic with Ea of 24,65 kJ/mol and k of 2.05x10-3 ( 40℃); 3.63x10-3 ( 50℃) dan 3.60x10-3 ( 60℃) g mg-1 minutet-1 respectivelly.

DETERMINATION OF RATE CONSTANT AND STABILITY OF ADSORPTION IN COMPETITIVE ADSORPTION OF Cr(III) AND Cd(II) ON HUMIC ACID BY USING THE NEW MODEL OF KINETIC FORMULATION Suyanta Suyanta; Sri Sudiono; Sri Juari Santosa
Indonesian Journal of Chemistry Vol 4, No 3 (2004)
Publisher : Universitas Gadjah Mada

Determination of rate and stability constants of adsorption in competitive adsorption of Cr(III) and Cd(II) on humic acid by using the new model of kinetic formulation has been done. The new model based on assumption that those adsorption was first order adsorption rearched equilibrium.Humic acid was isolated from Peat moss of Silaut- West Sumatra by modificated Schnitzer method. Humic acid characterization was conducted by using infrared spectrophotometer with KBR pellet method. The experiment of kinetic adsorption was conducted in batch system reactor using erlenmeyer at 25 ± 0.01 oC of water steam bath and in a series of sampling procedure. Initial concentration of both Cr(III) and Cd(II) was 4x10-4 M. Thirty milligrams of humic acid was added to 200 mL of metal solution, and then stirred continuously. At the fixed periode of time, 10 mL of sample was taken using a syringe, then filterd with 0.45 µm filter paper. Concentration of Cr(III) and Cd(II) in the filtrate was determinated by AAS, while that was adsorbed by humic acid was equal to difference between initial and equilibrium concentration. It was concluded that competitive adsorption of Cr(III) and Cd(II) on humic acid was first order adsorption rearched equilibrium as proposed in this research. Adsorption rate constant of Cr(III) on humic acid at competitive condition was greater than of Cd(II), but on the contrary for stability constant (K). Competition between Cr(III) and Cd(II) to interact with the active side of humic acid was dominated by Cr(III).

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