Articles

SYNTHESIS OF POLYPROPYLCALIX[6]ARENE FROM P-T-BUTYLPHENOL AS ADSORBENT FOR CR(III) METAL ION Prabawati, Susy Yunita; Jumina, Jumina; Santosa, Sri Juari; Mustofa, Mustofa
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (294.13 KB) | DOI: 10.22146/ijc.21417

Abstract

A study has been conducted to synthesize a novel polypropylcalix[6]arene polymer using p-t-butylphenol as a starting material. It was of interest to investigate the capability of the polymer with a tunnel-like structure, as adsorbent to trap the heavy metal cation such as Cr3+. The synthesis was carried out in several steps i.e (1) formation of p-t-butylcalix[6]arene from p-t-butylphenol as a starting material, (2) treatment of p-t-butylcalix[6]arene with 4.95 equivalents of allyl bromide under  alkaline conditions to yield p-t-butyl-37,40-diallyloxy-38,39,41,42-tetra-hydroxy-calix[6]arene, and (3) polymerization of p-t-butyl-37,40-diallyloxy-38,39,41,42-tetrahydroxycalix[6]arene by treatment with concentrated sulfuric acid to yield polypropyl-calix[6]arene. The application of polypropylcalix[6]arene for trapping Cr(III) was investigated by stirring the suspension of calixarene under variation of pH, time, and adsorbent mass. IR and 1H NMR spectra, showed that two allyl groups had been incorporated to the lower rim of the p-t-butylcalix[6]arene and the polymer was obtained as brownish green crystals with the melting point of 108-110 °C. The study also showed that the polypropylcalix[6]arene was able to trap Cr(III) cation. The optimum adsorption conditions were achieved at pH 5, contact time 60 min and concentration 12 mg/l for every 0,008 g of polymer.
MG/AL HYDROTALCITE-LIKE SYNTHESIZED FROM BRINE WATER FOR EOSIN YELLOW REMOVAL Heraldy, Eddy; Triyono, Triyono; Wijaya, Karna; Santosa, Sri Juari
Indonesian Journal of Chemistry Vol 11, No 2 (2011)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.468 KB) | DOI: 10.22146/ijc.21397

Abstract

Attempts to synthesis of Mg/Al HTlc using magnesium from several raw material resources are widely investigated. One of raw material would purpose as source of magnesium to synthesis of Mg/Al HTlc is brine water which is well known as the desalination process wastewater. Mg/Al HTlc are widely investigated for their potential applications in research and industrial processes as adsorbents, anionic exchange, catalysts and /or catalyst precursors for the preparation of inorganic materials and pharmaceutical industry excipients. As adsorbents, Mg/Al HTlc are receiving greater interests in the environmental community due to their high adsorption capacity. However, there is no literature available on the synthesis of Mg/Al HTlc from brine water except from artificial seawater. The objective of this research is to synthesis of Mg/Al HTlc from brine water and its ability tested for eosin yellow (EY) removal. Characterization of the Mg/Al HTlc synthesized was confirmed through X-ray Diffraction and FT-IR Spectroscopy. The effect of various experimental parameters was investigated using a batch adsorption technique. In this manner, the adsorption isotherms, adsorption kinetics, and pH effects upon EY adsorption on Mg/Al HTlc were examined. The result showed that EY data fit well with the pseudo-second order kinetic model. The isothermal data could be well described by the Freundlich equation. The adsorption capacity was 2.41 × 10-1 mol g-1, and adsorption energy of EY was 24.89 kJ mol-1.
APPLICATION OF HUMIC ACID ISOLATED FROM KALIMATAN PEAT SOIL MODIFYING MAGNETITE FOR RECOVERY OF GOLD Rahmayanti, Maya; Abdillah, Guliston; Santosa, Sri Juari; Sutarno, Sutarno
Jurnal Bahan Alam Terbarukan Vol 8, No 2 (2019): December 2019 [In Progress]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v8i2.20392

Abstract

Humic acid modifying magnetite particles (Mag-HA) were developed for recovery of gold from chloride solution (HAuCl4). The Mag-HA particles were prepared by co-precipitation procedure with Fe(III) and Fe(II) chloride salts, sodium hydroxide, and humic acid. FTIR characterization for Mag-HA after modification indicated the presence of the specific absorption for functional groups of humic acid and Fe-O bonds, though with lower intensity. The Mag-HA particles exhibited a typical superparamagnetic characteristic with a saturation magnetization of 66.99 emu/g. The Mag-HA particles were applied for AuCl4- adsorption and results showed that the optimum adsorption of [AuCl4]- onto Mag-HA was found at pH 3. The adsorption kinetics can be described by a pseudo-second order equation and the adsorption isotherm of the Mag-HA particles agreed well with Langmuir adsorption equation. The maximum adsorbed amount of [AuCl4]- was 0.62 mmol/g and the XRD analysis confirms that the adsorption of Au(III) by Mag-HA was accompanied by the formation of elemental gold.
PENGARUH SUBFRAKSINASI DAN pH TERHADAP SENSITISASI ASAM HUMAT PADA FOTOREDUKSI Cr(VI) MENJADI Cr(III) OLEH SEMIKONDUKTOR ZnO Santoso, Uripto Trisno; Herdiansyah, Herdiansyah; Santosa, Sri Juari; Siswanta, Dwi
Jurnal Sains dan Terapan Kimia Vol 1, No 1 (2007)
Publisher : Jurnal Sains dan Terapan Kimia

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Abstract

Pengaruh subfraksinasi dan pH terhadap sensitisasi asam humat (AH) pada fotoreduksi Cr(VI) menjadi Cr(III) oleh semikonduktor ZnO telah diteliti. AH diekstraksi dari tanah gambut yang berasal dari Kecamatan Gambut, Kabupaten Banjar, Kalimantan Selatan. Subfraksinasi AH menjadi subfraksi asam humat (SAH) dilakukan dengan menggunakan metode sentrifugasi. Fotoreduksi dilakukan dengan menggunakan dua buah lampu UV 30 watt model TUV (produksi Philips) yang diletakkan di dalam kotak penyinaran pada jarak sekitar 20 cm di atas sampel. Pada setiap percobaan, sebanyak 500 mL sampel diradiasi dengan cahaya UV. Semikonduktor ZnO (produksi Merck) disuspensikan ke dalam air dengan konsentrasi 2 g/L. Hasil penelitian menunjukkan bahwa SAH yang berbobot molekul lebih rendah menunjukkan efektivitas yang lebih baik sebagai sensitizer daripada SAH yang berbobot molekul lebih besar. Keasaman medium dapat mempengaruhi sensitisasi SAH pada fotoreduksi Cr(VI) oleh ZnO. Kemampuan SAH untuk mensensitisasi fotoreduksi Cr(VI) oleh semikonduktor ZnO pada pH 5 lebih baik daripada kemampuan sensitisasinya pada pH 1.Kata kunci: asam humat, subfraksi, sensitisasi, fotoreduksi.
CHITOSAN SUCCINATE/PVA-PEG MEMBRANE: PREPARATION, CHARACTERIZATION AND PERMEATION ABILITY TEST ON CREATININE Lusiana, Retno Ariadi; Sangkota, Vivi Dia Ahmad; Santosa, Sri Juari
Jurnal Kimia Sains dan Aplikasi Vol 21, No 2 (2018): Volume 21 Issue 2 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.194 KB) | DOI: 10.14710/jksa.21.2.80-84

Abstract

Evaluation character of chitosan membrane-succinate / poly vinyl alcohol-poly ethylene glycol (PVA-PEG) were prepared in acetic acid solvent through a phase inversion method has been performed. The study began with the preparation of crosslinked chitosan compounds with succinic acid, followed by preparation into membrane by combining PVA-PEG. Character analysis of the resulting material using FTIR, EDX, TGA, water absorption test, tensile strength, membrane hydrophilicity. The ability of membrane permeation was tested against creatinine. The results showed that the succinate had reacted with chitosan. Chitosan modification through cross link and polymer alloys increases tensile strength and membrane strain of 1.7-2.5 x of pure chitosan membrane. In addition, the modified membrane also has higher water absorption and hydrophilicity values than the unmodified membrane, and this implies the ability of membrane-induced creatinine permeation. Permeable permeation values were 13.8% in chitosan, 24.84% on chitosan-succinate and 25% in chitosan-succinate / PVA-PEG. Chitosan-succinate membranes have the ability to use more than 4x repeated use.
SILVER NANOPARTICLES CAPPED WITH P-HYDROXYBENZOIC ACID AS A COLORIMETRIC SENSOR FOR THE DETERMINATION OF PARAQUAT Gusrizal, Gusrizal; Santosa, Sri Juari; Kunarti, Eko Sri; Rusdiarso, Bambang
Indonesian Journal of Chemistry ARTICLE IN PRESS
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1240.279 KB) | DOI: 10.22146/ijc.48806

Abstract

Highly stable silver nanoparticles capped with p-hydroxybenzoic acid were synthesized by reducing silver ion with p-hydroxybenzoic acid and used for the detection of paraquat. The synthesized silver nanoparticles, which are yellow, exhibited an absorption peak at 420 nm when measured with a UV-visible spectrophotometer due to the surface plasmon resonance. In the presence of paraquat, the color of silver nanoparticles changed from yellow to purple accompanied by the appearance of a new peak at 580 nm in addition to the peak at 420 nm. In order to obtain optimum experimental conditions, temperature, and time of reaction were optimized, and the ratio of absorbance obtained at 580 nm and 420 nm (A580/A420) were monitored. The A580/A420 is proportional to the concentration of paraquat. Under the most favorable condition, the calibration curve showed a high level of linearity ranging from 6.0 × 10?4 to 1.0 × 10?3 M, and the detection limit was found to be 8.30 × 10?6 M. Silver nanoparticles capped with p-hydroxybenzoic acid was found to be useful for the colorimetric determination of paraquat in the aqueous medium.
KAJIAN ADSORPSI Ag(S2O3)23- DALAM LIMBAH FOTOGRAFI PADA ADSORBEN KITIN DAN ASAM HUMAT TERIMOBILISASI PADA KITIN Khoerunnisa, Fitri; Santosa, Sri Juari; Kunarti, Eko Sri
Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam Vol 9, No 2 (2007): Jurnal Pengajaran MIPA
Publisher : Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18269/jpmipa.v9i2.327

Abstract

This work was started with isolation of humic acid from peat soil and chitin from crab shell, immobilization of humic acid on chitin, and characterization of adsorbents of C and HAC. Optimum condition was studied by interacting the adsorbents with Ag(S2O3)23- in a synthetic solution on various  of pH from 2 to 10. Adsorption rate was studied by interacting the adsorbent with Ag(S2O3)23- in the synthetic solution on various time from 2 to 120 minutes. The determination of the energy and the capacity of adsorption were studied by interacting the adsorbent with Ag(S2O3)23- on various initial concentration from 2 to 75 ppm. Moreover, the mechanism of adsorption was studied by applying a sequential desorption using H2O, Na2EDTA 0.1 M, KSCN 0.5 M, and KOH 1 M. The adsorption of Ag(S2O3)23- in photography wastewater on C and on HAC were studied at the same condition as obtained for the synthetic solution. The result showed that pH 2 was the optimum adsorption condition for Ag(S2O3)23- in the synthetic solution on both C and HAC adsorbents. Ag(S2O3)23- in the synthetic solution was chemically adsorbed on C and on HAC, involving energy adsorption of 22.74–23.30 kJ/mole, respectively. Adsorption of Ag(S2O3)23- on C was faster than that on HAC with the rate constants for adsorbent C and HAC were 73 x 10-4 and 46 x 10-4 minute-1, respectively. Adsorption capacity of Ag(S2O3)23- on C and on HAC were 2.107 x 10-4 and 1.818 x 10-4 mole/g, respectively. The amount of Ag(S2O3)23- in photography wastewater that was adsorbed on C and on HAC were 13.52 and 12.47 mg/L, respectively. The hydrogen bonding and ion exchange were the dominant mechanism of adsorption.Key words: Ag(S2O3)23-, adsorption, chitin, immobilization, humic acid.
SISTEM PENURUNAN KADAR KROM (III) LIMBAH CAIR INDUSTRI PENYAMAKAN KULIT DENGAN KOMBINASI PRESIPITASI MENGGUNAKAN NATRIUM HIDROKSIDA DAN ADSORPSI MENGGUNAKAN BAGASE FLY ASH -, Meirinna; Fahrurrozi, Moh.; Santosa, Sri Juari
ASEAN Journal of Systems Engineering Vol 1, No 2 (2013): ASEAN Journal of Systems Engineering
Publisher : Master Program of Systems Engineering

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Abstract

Wastewater in the tannery industry is the main waste due to the use of a great amount of water and chemical substances in the process. Wastewater which contains chromium from the tanning materials potentially causes physical and chemical changes in the environment. Chromium is harmful heavy metal which is non-degradable and able to cause danger towards environment and human health. Therefore, it is important to employ treatments before discharging the wastewater to the environment. One of the known methods to reduce the content of heavy metal is precipitation using sodium hydroxide. However, precipitation alone can not meet the strict quality standard for tannery industrial wastewater. Adsorption using bagasse fly ash (BFA) is a key promising tertiary method to achieve the high treatment standard. BFA is a low cost adsorbent since it is prepared from solid waste from sugar industry. This research aims to study optimum operating condition of the implementation of a combination of precipitation and adsorption methods for reducing chromium (III) in the tannery industrial wastewater.Initially, this study used synthetic waste to obtain optimum conditions for adsorption method. The optimum conditions were then tested using real waste from tannery industry. Synthethic waste used in this process was Cr(NO3)3.9H2O. Adsorption process used both activated BFA as well as raw (un-activated) BFA. Concentration of crom (III) in the filtrate was determined by AAS (Atomic Absorption Spectrocopy). Parameters of the study were pH of the precipitation, and pH of the adsorption.Results of this study showed that the optimum pH to chrom (III) concentration reduction is achieved from the combination of precipitation at pH of 8 and adsorption at pH of 5. The effectiveness of the concentration reduction of chromium using combination of both of these methods managed to lower the concentration of chromium from initial concentration of 544 mg/l to 0,18 mg/l (using activated BFA), with the effectiveness of chromium reduction 99.97%. This result complies with the standard based on Yogyakarta Governor's decree number 7/2010 about wastewater quality standard for wet blue leather industrial activities, which is 0,4 mg/l.
THE EFFECT OF NaOH CONCENTRATION AND TEMPERATURE ON ZEOLITE SYNTHETIS FROM FLY ASH BY HIDROTHERMAL ALKALI Jumaeri, Jumaeri; Sutarno, Sutarno; Kunarti, Eko Sri; Santosa, Sri Juari
Jurnal Zeolit Indonesia Vol 8, No 1 (2009)
Publisher : Jurnal Zeolit Indonesia

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Abstract

Zeolite synthesis from coal fly ash PLTU Tanjung Jati Japara was conducted by hydrothermal alkali. Preparation was done on fly-ash that has been refluxed with 1M of HCl and without refluxed. NaOH with certain concentration (2, 3, and 4M) was mixed with coal fly-ash by ratio 10 ml each 1 gram of fly ash into Teflon tube 100 ml at autoclave stainless-steel. Then, autoclave was heated on the oven at temperature of 120-1600C. Synthetic zeolite ouput was qualitative tested by using infrared spectroscopy, X-Ray diffraction, and SEM. The result showed that NaOH concentration, temperature, and hydrothermal alkali period of coal fly ash was affecting characterization of zeolite ouput. The temperature which use for optimally hydrothermal processes exist on range 140 –160oC. The increase of temperature causes improving crystallization of zeolite products. Hydrothermal synthetic product from fly ash is alumina-silica compound which are a mixture of some crystals such as P zeolite, Y zeolite, sodalite, mullite, and quartz.
PEMANFAATAN SENYAWA POLI-MONOALILOKSI-KALIK[6]ARENA SEBAGAI ANTIDOTUM KERACUNAN KADMIUM PADA MENCIT Prabawati, Susy Yunita; Jumina, Jumina; Mustofa, Mustofa; Santosa, Sri Juari
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 20, No 2 (2013)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Abstract

Pada penelitian ini dipelajari kemampuan dari senyawa poli-monoaliloksi-kaliks[6]arena (PMK[6]H) sebagai antidotum keracunan Cd pada mencit. Penelitian ini mengikuti rancangan acak lengkap dengan menggunakan mencit jantan, galur Balb/C, sehat, umur 2-3 bulan dan mempunyai bobot badan yang seragam. Subjek uji sebanyak 30 ekor dikelompokkan menjadi 6 kelompok. Kelompok 1 adalah kelompok mencit yang diberi pakan normal dan larutan CMC 0,5%. Kelompok 2 (kontrol negatif ) diberi pakan normal dan dicekok larutan CdCl2 (3,15 mg selama 14 hari pada setiap pagi). Kelompok 3 adalah kelompok kontrol positif (kontrol antidotum) dan kelompok 4-6 adalah kelompok eksperimen. Kelompok 3-6 diberi pakan normal dan dicekok larutan CdCl2 selama 14 hari pada setiap pagi dan sore harinya diobati dengan dimerkaprol (0,65 mg/Kg BB) untuk kelompok 3 dan PMK[6]H untuk kelompok eksperimen dengan dosis masing-masing 0,22; 0,65; dan 1,95 mg/Kg BB dalam CMC 0,5%. Pengamatan gejala toksik dilakukan selama 14 hari. Pada akhir masa uji, mencit dikorbankan untuk selanjutnya diambil ginjal dan hatinya untuk diukur kadar Cd dengan menggunakan spektrofotometer serapan atom (AAS) dan untuk pengamatan histopatologi. Hasil penelitian menunjukkan adanya penurunan kadar Cd dalam ginjal mencit pada kelompok 3-6 yaitu berturut-turut sebesar 14,98; 15,22; 30,92; dan 45,61 %. sedangkan kadar Cd dalam hati mengalami penurunan masing-masing sebesar 23,37; 25,79; 31,82; dan 35,66 %. Berdasarkan data tersebut, maka PMK[6]H dapat menurunkan kadar Cd dalam ginjal dan hati mencit yang telah diracuni dengan CdCl2 bahkan pada tingkat dosis yang sama, PMK[6]H memberikan penurunan kadar Cd yang lebih besar dari dimerkaprol.