Claim Missing Document
Check
Articles

Found 18 Documents
Search

BENTONIT-Fe3O4 SEBAGAI FOTOKATALIS DALAM PROSES FOTODEGRADASI NAPHTHOL BLUE BLACK DENGAN IRADIASI UV I. E. Suprihatin; N. D. Murdani; I W. Suarsa
Jurnal Kimia (Journal of Chemistry) Vol. 15, No.1, Januari 2021
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JCHEM.2021.v15.i01.p09

Abstract

Bentonit adalah salah satu jenis bahan yang umum.digunakan sebagai penyerap limbah zat warna. Namun, masih terdapat kesulitan dalam pemisahan dan pengumpulan kembali..adsorben setelah proses penyerapan. Oleh karena itu, dalam penelitian ini bentonit dijadikan komposit dengan oksida besi yang bersifat magnetik untuk mengatasi masalah tersebut. Penelitian ini bertujuan untuk mendegradasi zat warna Naphthol blue black menggunakan bentonit-Fe3O4 sebagai fotokatalis bukan sekedar adsorben.. Penelitian ini.meliputi penentuan.massa bentonit-Fe3O4 optimum, pH optimum, waktu iradiasi optimum, serta..efektivitas.fotodegradasi..pada kondisi optimum...Hasil penelitian menunjukkan bahwa..kondisi..optimum..yang diperoleh yaitu massa bentonit-Fe3O4 sebesar 50 mg, pH. 5 dan waktu iradiasi dengan sinar UV adalah 30 menit. Persentase fotodegradasi pada kondisi optimum sebesar 98,95±0,01% yang menunjukkan fotodegradasi menggunakan fotokatalis bentonit-Fe3O4 efektif menurunkan konsentrasi zat warna Naphthol blue black... Kata kunci: fotodegradasi, katalis bentonit-Fe3O4, Naphthol blue black Bentonite is one of the best adsorbents for dye waste. However, there is a problem in separating and re-collecting the adsorbent.after the adsorption process. Therefore, in this research bentonit was composited with Fe3O4 which was paramagnetic and used as a photocatalyst instead of adsorbent. This study aimed to degrade Naphthol blue black dyes using the bentonite-Fe3O4 photocatalysts. In this research the bentonite-Fe3O4 photocatalyst was used to assist the photodegradation of blue-black naphthol using UV light. The study included the determination.of the optimum conditions namely the mass of bentonite-Fe3O4,.pH, and irradiation time, as well as the effectiveness of photodegradation under the..optimum conditions...The result of the study showed that the optimum conditions obtained were as follows: the mass of bentonite-Fe3O4 of 50 mg, pH 5, and the irradiation time of 30 minutes. The effectiveness of photodegradation under the optimum conditions was 98.95±0.01%. This indicated that.photodegradation method using bentonite-Fe3O4 as the photocatalysts effectively decreased the concentration of Naphthol Blue Black dyes in the waste. Keywords: bentonit-Fe3O4 catalyst, Naphthol blue black, photodegradation
PENGOLAHAN LARUTAN DETERJEN DENGAN BIOFILTER TANAMAN KANGKUNGAN (IPOMOEA CRASSICAULIS) DALAM SISTEM BATCH (CURAH) TERAERASI Ni G. A. M Dwi Adhi Suastuti; I Wayan Suarsa; Dwi Kurnia Putra R
Jurnal Kimia (Journal of Chemistry) Vol. 9, no. 1 Januari 2015
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (120.006 KB) | DOI: 10.24843/JCHEM.2015.v09.i01.p16

Abstract

This study was aimed to determine the ability of kangkungan plant (Ipomoea crassicaulis) as a biofilter in the treatment process of detergent solution with the use of an aerated batch system (bulk). The processing units were conditioned in a Styrofoam container equipped with an aeration system. A total of 24 L detergent solution and 5 kangkungan plants were applied in the units. As a comparison, a control unit containing the same solution without the addition of kangkungan plants was also carried out. Investigations of the ability of kangkungan in reducing the content of the pollutants which were measured as COD value, surfactant and phosphate levels were run within 30 days of observations. After 30 days it was found that there was a decrease in surfactant and phosphate levels, which were 97.76%; and 90.77%, respectively while the control showed a decrease of 50.79% and 51.53%, respectively
MODIFIKASI LEMPUNG BENTONIT TERAKTIVASI ASAM DENGAN BENZALKONIUM KLORIDA SEBAGAI ADSORBEN ZAT WARNA RHODAMINE B Ni Putu Widya Tironika Dewi; I Nengah Simpen; I Wayan Suarsa
Jurnal Kimia (Journal of Chemistry) Vol. 11. No. 1 Januari 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (419.862 KB) | DOI: 10.24843/JCHEM.2017.v11.i01.p12

Abstract

Telah dilakukan penelitian tentang modifikasi lempung bentonit yang teraktivasi asam dan terinterkalasi surfaktan sebagai adsorben dalam penyerapan zat warna rhodamine B. Asam yang digunakan untuk aktivasi adalah asam sulfat 1,5 M dan surfaktan untuk interkalasi digunakan surfaktan benzalkonium klorida (BKC) dengan variasi konsentrasi 0,1; 0,5; dan 1% (v/v). Karakterisasi adsorben dilakukan dengan metode difraksi sinar-X untuk menentukan perubahan basal spacing d001 dan spektrofotometer FTIR untuk menentukan gugus fungsional yang terkandung pada adsorben. Hasil penelitian menunjukkan terjadinya perubahan basal spacing d001 untuk adsorben Ao, Aa, Aa0,1, Aa0,5, dan Aa1 secara berturut-turut adalah 17,3312; 17,1642; 16,1432; 16,1680; dan 19,7156 Å. Nilai keasaman permukaan tertinggi dimiliki oleh adsorben Aa0,1 yaitu sebesar 1,8657 ± 0,0111 mmol/g. Sementara nilai luas permukaan untuk adsorben Ao, Aa, Aa0,1, Aa0,5 dan Aa1 secara berturut – turut adalah 89,6888; 90,1982; 90,3896; 90,3110; dan 90,3053 m2/g. Waktu optimum adsorpsi 90 menit dapat mengadsorpsi adsorbat sebanyak 22,0944 mg/g. Kapasitas adsorpsi tertinggi dimiliki oleh adsorben terinterkalasi BKC 0,1% (Aa0,1) yaitu sebesar 10,6905 mg/g, dengan mengikuti model Freundlich dengan koefisien linier (R2) 0,980.
AMPLIFIKASI FRAGMEN GEN 18S rRNA PADA DNA METAGENOMIK MADU DENGAN TEKNIK PCR (POLYMERASE CHAIN REACTION) Satriya Putra Prakoso; I Nengah Wirajana; I Wayan Suarsa
Indonesian Journal of Legal and Forensic Sciences (IJLFS) Vol 7 (2017): Indonesian Journal of Legal and Forensic Sciences
Publisher : Penerbit, sejak 2012 : Asosiasi Ilmu Forensik Indonesia dan UPT Lab. Forensik Sain dan Kriminilogi - Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJLFS.2017.v07.i01.p03

Abstract

The aim of this research was to amplificate 18S rRNA gene fragment from honey’s metagenomic DNA using Polymerase Chain Reaction (PCR). The honey sample was collected from Seraya Tengah village, Karangasem regency. The best result of primer design from in silico test was continued to in vitro test using PCR method. The optimum conditions for amplification was obtained as follows: pre-denaturation at 95oC for 3 minutes and continued with 30 of amplification cycle (denaturation at 95°C for 1 minutes, annealing at 55°C for 1 minutes and elongation at 72°C for 1 minutes) and the last step continued with extension process at 72°C for 2 minutes. The size of DNA fragment band of amplified product was about 100 bp which obtained from the honey’s metagenomic DNA.
ADSORPSI ASAM LEMAK BEBAS PADA MINYAK JELANTAH DENGAN TiO2/ZEOLIT ALAM I. W. Suarsa; I. N. Simpen; M. W. Prayani
Jurnal Kimia (Journal of Chemistry) Vol. 16, No.2, Juli 2022
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JCHEM.2022.v16.i02.p09

Abstract

Penelitian ini dilakukan untuk mengetahui kemampuan adsorben TiO2/zeolite alam dalam mengadsorpsi FFA pada minyak jelantah. Kajian yang dilakukan meliputi sintesis adsorben TiO2/zeolite alam, karakterisasi, dan aplikasinya untuk mengadsorpsi FFA dengan berbagai variasi waktu kontak, volume minyak, dan massa adsorben. Adsorben dikarakterisasi gugus fungsinya dengan FTIR, situs aktif secara titrasi asam-basa, dan luas permukaan secara adsorpsi metilen biru. Adsorben dengan karakter terbaik ditunjukkan oleh TiO2/zeolite alam 9 : 100 yang memiliki situs aktif basa 11,6048 x 1020 situs/g dan luas permukaan 45,6979 m2/g. Hasil penelitian menunjukkan bahwa proses adsorpsi terjadi secara optimum pada waktu kontak 60 menit dengan volume minyak 100 mL dan massa adsorben 0,30 g dengan kapasitas adsorpsi dan efisiens penjerapan (%EE) berturut-turut (1,00±0,00) mg/g dan (79,57±0,17)%. Jenis isoterm adsorpsi yang terjadi adalah isoterm Freundlich dengan nilai koefisien korelasi (R2) 0,9910 serta energi bebas Gibbs (?G0) -3,5571 kJ/mol yang menunjukkan proses adsorpsi berlangsung secara spontan dan terjadi adsorpsi secara fisik (pori heterogen dan multilayer). Kata kunci: adsorpsi, FFA, isoterm adsorpsi, minyak jelantah, TiO2/zeolit alam. ABSTRACT This research was conducted to determine the ability of TiO2/natural zeolite in adsorbing free fatty acids in used cooking oil. The studies included the synthesis of TiO2/natural zeolite adsorbent, characterization, and its application to adsorb free fatty acids with variations of contact time, oil volume, and adsorbent mass. The adsorbents’ functional groups were characterized by FTIR, active site by acid-base titration, and surface area by adsorption of methylene blue. The best character of adsorbent was TiO2/natural zeolite 9:100 which had a basicity active site of 11.6048 x 1020 sites/g and a surface area of ??45.6979 m2/g. The results showed that the optimum adsorption process occurred at a contact time of 60 minutes with an oil volume of 100 mL and an adsorbent mass of 0.30 grams resulting in an adsorption capacity and adsorption efficiency (%EE) of (1,00 ± 0.00) mg/g and (79.57 ± 0.17)%, respectively. The type of adsorption isotherm that occurred was Freundlich isotherm with a correlation coefficient (R2) of 0.9910 and Gibbs free energy (?G0) of -3.5571 kJ/mol, which indicated the adsorption process occurred spontaneously and it was a physical adsorption (heterogeneous and multilayers pores). Keywords: adsorption, adsorption isotherm, free fatty acids, TiO2/natural zeolite, used cooking oil. ).
PEMANFAATAN ZEOLIT-BENTONIT SEBAGAI ADSORBEN FOSFAT DALAM AIR I. A. G. Widihati; G. S. U. Mahaputra; I. W. Suarsa
Jurnal Kimia (Journal of Chemistry) Vol. 16, No.2, Juli 2022
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JCHEM.2022.v16.i02.p10

Abstract

Salah satu cara yang dilakukan untuk menurunkan kadar fosfat dalam air yaitu dengan cara adsorpsi. Adsorpsi dianggap sebagai metode pengolahan limbah air terbaik karena bahan utamanya yaitu adsorben keberadaannya melimpah dan mudah digunakan. Penelitian ini dilakukan untuk mengetahui kemampuan zeolit yang dikombinasikan dengan bentonit dalam mengadsorpsi fosfat dalam air, menentukan waktu optimum, pola isoterm adsorpsinya serta kapasitas adsorpsi. Kajian yang dilakukan meliputi karakterisasi, dan aplikasinya untuk mengadsorpsi fosfat dengan berbagai variasi waktu kontak dan konsentrasi. Adsorben dikarakterisasi luas permukaan dengan adsorpsi metilen biru dan situs aktif secara titrasi asam-basa. Luas permukaan spesifik masing-masing adsorben nilainya hampir sama, namun yang paling besar adalah kombinasi zeolit : bentonit (1:1) yaitu 45,9637 m2/g. Situs aktif terbesar terdapat pada adsorben kombinasi zeolit : bentonit (1:1) yaitu 1,2842×1024 situs/g adsorben. Semua adsorben kombinasi zeolit : bentonit memiliki waktu kontak optimum yang sama yaitu 24 jam. Adsorben yang terdiri dari zeolite saja atau zeolit : bentonit (5:0) mengikuti pola isoterm adsorpsi Langmuir, sedangkan zeolit : bentonit (1:1) mengikuti pola isoterm Freundlich. Adsorben zeolit : bentonit (5:0), (1:1), dan (0:5) memiliki kapasitas adsorpsi yang optimum pada konsentrasi 100 ppm dengan persen teradsorpsi berturut-turut 96,66; 97,67; dan 97,02 %, sehingga dapat dilihat bahwa adsorben zeolit : bentonit (1:1) merupakan adsorben yang paling banyak menyerap fosfat. Kata Kunci: adsorpsi, bentonit, fosfat, zeolit. ABSTRACT One way to reduce phosphate levels in water is by adsorption. Adsorption is considered as the best wastewater treatment method because the main material, namely adsorbent, is abundant and easy to use. This research was conducted to determine the ability of zeolite combined with bentonite to adsorb phosphate in water, the optimum time, the pattern of adsorption isotherms and the adsorption capacity. The studies included the characterization of the adsorbent as well as its application to adsorb phosphate with various contact times and concentrations. The surface area of the adsorbents was characterized by the methylene blue adsorption method and the active site by acid-base titration. The specific surface area of ??each adsorbent had almost the same value, but the largest was the combination of zeolite: bentonite (1:1) which was 45.9637 m2/g. The largest active site of the adsorbent was the combination of zeolite: bentonite (1:1) adsorbent, which is 1.2842×1024 sites/g adsorbent. All the zeolite : bentonite combination adsorbents had the same optimum contact time of 24 hours. The zeolite: bentonite (5:0) followed the Langmuir adsorption isotherm pattern, while the zeolite : bentonite (1:1) followed the Freundlich isotherm pattern. Zeolite : bentonite (5:0), (1:1), and (0:5) had the optimum adsorption capacity at the concentration of 100 ppm with the percentage of phosphate adsorbed of 96.66; 97.67; 97.02%, respectively, so it showed that the zeolite : bentonite (1:1) adsorbed the most phosphate. Keywords: adsorption, bentonite, phosphate, zeolite.
BIOAVAILABILITAS TIMBAL (Pb) DAN TEMBAGA (Cu) DALAM TANAH PERTANIAN SERTA KANDUNGANNYA DI DALAM BIJI PADI Ni Desak Komang Ayu Hartani; I Made Siaka; I Wayan Suarsa
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 10 No 2 (2022): Cakra Kimia (Indonesian E-Journal of Applied Chemistry)
Publisher : Graduate Program of Applied Chemistry, Udayana University, Bali-INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ABSTRAK: Penggunaan pupuk anorganik secara terus menerus pada tanah pertanian dapat menyebabkan peningkatan akumulasi logam berat dalam tanah tersebut. Penelitian ini bertujuan untuk mengetahui tingkat pencemaran, bioavailabilitas logam Pb dan Cu dalam tanah, dan kandungan logam tersebut dalam beras yang dihasilkan dari pertanian tersebut. Metode ekstraksi bertahap digunakan untuk spesiasi dan penentuan konsentrasi logamnya menggunakan instrumen AAS. Pada penelitian ini ditemukan bahwa kandungan logam total Pb dan Cu dalam tanah berturut-turut pada kisaran 58,76-70,22 mg/kg dan 66,60-72,31 mg/kg untuk tanah sebelum penanaman padi dan saat panen berkisar 65,33-78,09 mg/kg dan 71,07-82,25 mg/kg. Logam Pb dan Cu yang bioavailable pada tanah sebelum penanaman padi ditemukan paling rendah, yaitu 13,80-19,71% dan 10,82-11,69%, diikuti oleh logam non bioavailable: 35,33-38,83% dan 23,97-35,51%, dan paling tinggi adalah logam yang berpotensi bioavailable, yaitu 44,17-47,37% dan 52,98-64,62%. Akan tetapi, kandungan Pb dan Cu dalam beras berturut-turut 0.12-0,29 mg/kg dan 1,88-2,518 mg/kg. Berdasarkan hasil penelitian ini, tanah pertanian di Desa Kukuh, Tabanan tergolong tidak tercemar menurut nilai the former Greater London Council (GLC), yaitu <500 mg/kg untuk Pb dan <100 mg/kg untuk Cu. Begitu juga, persentase logam yang bioavailable paling rendah, sehingga dapat diprediksi bahwa tidak lebih dari 20% logam-logam tersebut terakumulasi dalam tanaman. Ini terbukti bahwa kandungan Pb dan Cu dalam beras sangat kecil dan berada di bawah ambang batas yang diperbolehkan FAO/WHO, yaitu <0,3 mg/kg untuk Pb dan <10 mg/kg untuk Cu. Dengan demikian, beras yang diproduksi dari tanah pertanian tersebut tidak tercemar logam berat dan aman untuk dikonsumsi. ABSTRACT: The use of inorganic fertilizers on agricultural soils continuously and excessively can lead to an increase in the accumulation of heavy metals in the soil. This study aimed to determine the level of contamination, the bioavailability of Pb and Cu in soil, and their contents in rice produced from agriculture. The sequential extraction method was used to determine the bioavailability of the metals. In this study, it was found that the total metals content of Pb and Cu in the soil were 58.76-70.22 mg/kg and 66.60-72.31 mg/kg for the soil before planting rice and at harvest time were 65.33-78.09 mg/kg and 71.07-82.25 mg/kg, respectively. The Pb and Cu being bioavailable in the soil before planting rice were found to be the lowest at 13.80-19.71% and 10.82-11.69%, followed by non-bioavailable metals: 35.33-38.83% and 23.97-35.51%, and the highest were the metals being potentially bioavailable: 44.17-47.37% and 52.98-64.62%. However, Pb and Cu contents in rice were 0.12-0.29 mg/kg and 1.88-2.518 mg/kg. Based on the results of this study, agricultural soil in Kukuh Village, Tabanan was classified as unpolluted according to the value of the former Greater London Council (GLC) for Pb <500 mg/kg and <100 mg/kg for Cu). Moreover, it was found that the metals content in the rice was below the maximum limit allowed by FAO/WHO (<0.3 mg/kg for Pb and <10 mg/kg for Cu). Thus, rice produced from the agricultural soil of Kukuh-Tabanan was not contaminated by heavy metals and was safe for consumption.
SINTESIS DAN KARAKTERISASI BENTONIT-ZnO SERTA PEMANFAATANNYA DALAM DEGRADASI LIMBAH INDUSTRI PENCELUPAN I. E. Suprihatin; N. W. S. P. Dewi; I W. Suarsa
Jurnal Kimia (Journal of Chemistry) Vol. 17, No.1, Januari 2023
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JCHEM.2023.v17.i01.p10

Abstract

ABSTRAK Limbah yang dihasilkan dari industri tekstil berupa limbah cair yang keruh, berwarna dan sulit dihilangkan sehingga dapat mengganggu ekosistem perairan. Limbah hasil pencelupan dapat mencemari lingkungan karena menggunakan zat warna azo yang sulit untuk didegradasi. Salah satu metode yang dapat diaplikasikan untuk mengatasi ini adalah fotodegradasi. Dalam artikel ini dilaporkan sintesis fotokatalis bentonite-ZnO dan aplikasinya dalam fotodegradasi zat warna dalam limbah pencelupan. Karakterisasi fotokatalis dilakukan dengan melihat kristalinitas kompositnya menggunakan X-Ray Diffraction (XRD), luas permukaannya dengan metode methylene blue serta penentuan efektivitas degradasi dengan dan tanpa sinar. Difraktogram yang dihasilkan menunjukkan beberapa puncak dengan intensitas tinggi: pada 2? = 20,51° (d=4,32Å) yang menunjukkan adanya mineral kuarsa sedangkan pada 2? = 26,28° (d=3,39Å) mengindikasikan illit. Puncak khas dari ZnO ditunjukkan pada pola difraksi 2? = 36,18° (d=2,46Å) dan 2? = 59,64° (d=1,54Å). Luas permukaan bentonit dan bentonit-ZnO berturut-turut 183,0665 dan 180,2460 m2/g. Kondisi optimum yang diperoleh dalam mendegradasi zat warna limbah industri pencelupan yaitu massa 100 mg pada pH 2 dan waktu irradiasi atau pengadukan dalam gelap selama 45 menit. Degradasi dengan sinar lebih efektif (95,66 ± 0,16%) dibandingkan tanpa sinar (73,28 ± 0,55%) yang menunjukkan peran komposit bentonite-ZnO sebagai fotokatalis. Kata kunci: Bentonit-ZnO, Fotodegradasi, Limbah Industri Pencelupan ABSTRACT Liquid waste generated by the textile industry is typically murky, intensely coloured, and hard to treat. As a consequence, it can pollute the aquatic ecosystem. One potential method to overcome this problem is photodegradation to break the dye molecules down. In this paper the synthesis of bentonite-ZnO composite and its application as a photocatalyst are reported. The composite was prepared by sonicating a mixture of zinc acetate and bentonite. The characterization of the composite was conducted using X-Ray Diffraction (XRD) and methylene blue method to determine its surface area, and its degradation capacity as photocatalyst to degrade the dye waste. The diffractogram reveals several peaks with high intensity, i.e. at 2? = 20,51° (d = 4,32Å) indicating mineral quartz, and at 2? = 26,28° (d = 3,39Å) showing Illite. The identifying peaks of the ZnO are in the diffraction pattern of 2? of 36,18° (d = 2,46Å) and 59,64° (d = 1,54Å). The surface area of the bentonite and bentonite-ZnO are 183,0665 and 180,260 m2/g respectively. The optimum conditions obtained for the dye degradation are 100 mg photocatalyst at pH 2 and irradiation time of 45 minutes. Degradation under UV light is more effective with a degradation percentage of 95,66 ± 0,16% than that in the dark, which is 73,28 ± 0,55%. This shows that the composite plays its role as a photocatalyst for the degradation. Keywords: Bentonite-ZnO, Dyeing Industrial Waste, Photodegradation.