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All Journal Jurnal Zeolit Indonesia PROSIDING SEMINAR KIMIA JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Molekul: Jurnal Ilmiah Kimia Jurnal Pijar MIPA Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Jurnal Teknologi Lingkungan

Sri Juari Santosa

Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Sekip Utara, Yogyakarta 55281, Indonesia

Author-ID : 385627

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics

Published : 8 Documents Claim Missing Document

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Articles

THE EFFECT OF NaOH CONCENTRATION AND TEMPERATURE ON ZEOLITE SYNTHETIS FROM FLY ASH BY HIDROTHERMAL ALKALI Jumaeri Jumaeri; Sutarno Sutarno; Eko Sri Kunarti; Sri Juari Santosa
Jurnal Zeolit Indonesia Vol. 8 No. 1 (2009)
Publisher : Jurnal Zeolit Indonesia

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

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.

EKSTRAKSI, PEMURNIAN DAN KARAKTERISASI ASAM HUMAT DARI TANAH GAMBUT SAMARINDA Soerja Koesnarpadi; Sri Juari Santosa; Dwi Siswanta; Bambang Rusdiarso
PROSIDING SEMINAR KIMIA 2021: SEMINAR NASIONAL KIMIA 2021
Publisher : PROSIDING SEMINAR KIMIA

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Telah dilakukan ekstraksi, pemurnian dan karakterisasi asam humat (AH) dari tanah gambut di daerah Sambutan, Samarinda Kalimantan Timur. Ekstraksi AH dari tanah gambut dilakukan menggunakan larutan basa NaOH 0,1 M sedangkan pemurnian digunakan larutan HCl 0,1 M/HF 0,3 M hingga diperoleh kadar abu dibawah 1%. Karakterisasi padatan AH hasil pemurnian dianalisis gugus fungsional menggunakan FT-IR, analisis kadar keasaman total, kandungan gugus –COOH dan –OH, analisis kandungan humifikasi menggunakan spektrofotometer UV-Vis, struktur kristal menggunakan XRD, morfologi permukaaan dan komposisi unsur menggunakan SEM-EDX serta luas permukaan dan volume pori menggunakan analisis GSA. Hasil penelitian menunjukkan bahwa kadar abu AH setelah pemurnian sebesar 0,8%, Spektra FT-IR AH setelah pemurnian terlihat serapan pada bilangan gelombang khas untuk AH hampir sama dengan AH ekstrak kasar namun ada perbedaan peningkatan intensitas gugus O-H pada 3425 cm-1, serapan –C=C- aromatik dan vibrasi –C=O asimetri dari COO pada 1629 cm-1 serta hilangnya pengotor silikat Si-O dan vibrasi ulur C-O dari senyawa polisakarida pada 1033 cm-1 . Kandungan keasaman total, gugus karboksilat dan gugus hidroksil pada AH murni berturut-turut 685, 334 dan 351 cmol kg-1. Analisis UV –Vis diperoleh rasio E465/E665 sebesar 4,6. Difraktogram AH murni berbentuk amorf dengan tidak adanya nilai intensitas tertentu pada 2θ di rentang 0°–70°. Morfologi permukaan AH berbentuk koloid halus dan rigid yang merata pada permukaannya dengan komposisi unsur yang dominan adalah C dan O. Luas permukaan dan volume pori AH murni sebesar 4,650 m2 g-1 dan 0,004 mL g-1. Hal ini menunjukkan bahwa AH dari tanah gambut Samarinda berhasil diekstrak dan dimurnikan serta sesuai dengan sifat karakteristiknya. Kata kunci: Ekstraksi, Pemurnian, Karakterisasi, asam humat (AH), tanah gambut.

PENERAPAN FREUNDLICH MODEL PADA ADSORPSI-REDUKTIF ISOTHERM AUCL4ÃÂ¯ DENGAN ASAM Nurul Ismillayli; Sri Juari Santosa; Dwi Siswanta
Jurnal Pijar Mipa Vol. 10 No. 2 (2015): September
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Abstrak: Telah dilakukan adsorpsi reduktif isotherm AuCl4ÃÂ¯ dengan menggunakan asam humat hasil isolasi tanah gambut Rawa Pening, Ambarawa. Isolasi dilakukan melalui perendaman alam 0,1 M NaOH dan dilanjutkan dengan pemurnian menggunakan 0,1 M HCl/0,3 M HF. Asam humat hasil isolasi dikarakterisasi menggunakan spektroskopi inframerah, ditentukan kadar abunya dan diaplikasikan untuk adsorpsi reduksi isotherm larutan AuCl4ÃÂ¯. Hasil karakterisasi menunjukkan bahwa asam humat hasil isolasi memiliki gugus Ã¢â¬âCOOH, -OH fenolik, hidrokarbon alifatik dan aromatis dengan kadar abu sebesar 1,13%. Data adsorpsi AuCl4ÃÂ¯ ÃÂ dengan menggunakan asam humat lebih menunjukkan kecocokan dengan persamaan Freundlich di banding Langmuir, dengan harga R=0,92, n=1,7184 dan log KF= 4,1707. Reduksi Au(III) menjadi Au(0) oleh asam humat dikonfirmasi dengan munculnya puncak tajam baru dengan nilai 2ÃÂ¸ =38, 44, 64 dan 77ÃÂ° yang merupakan puncak karakteristik dari partikel emas.ÃÂ Kata kunci: adsorpsi reduktif isotherm, AuCl4ÃÂ¯, asam humat, Freundlich.ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ Abstract: Isotherm adsorption reductive of AuCl4ÃÂ¯ by using isolated humic acid of Rawa Pening peat soil, Ambarawa had been conducted. Isolation was done by soaking peat soil in 0.1 M NaOH and following by purification in 0.1M HCl/0.3 HF. The isolated humic acid was characterized using infrared spectroscopy, determined its ash contain and aplicated for isotherm adsorption reductive of AuCl4ÃÂ¯. FTIR spectra indicated that isolated humic acid consist of COOH group, phenolic Ã¢â¬âOH, aliphatic hydrocarbon and aromatic ring, its ash content was 1.13%. Asorption data of AuCl4ÃÂ¯ÃÂ showed more suitable for Freundlich model than Langmuir model, with R=0,92, n=1,7184 and log KF= 4,1707. Reduction of Au(III) to Au(0) was confirmed by appearance of sharp peak at 2ÃÂ¸ = 38, 44, 64 dan 77ÃÂ° as characteristic peak of gold particles.Keywords: Isotherm adsorption reductive, AuCl4ÃÂ¯ , humic acid, Freundlich.

Colorimetric Detection of Hg(II) Ion Using Silver Nanoparticles Capped with 3-Hydroxybenzoic Acid Gusrizal Gusrizal; Andi Hairil Alimuddin; Ajuk Sapar; Rizki Noviani Ridwan; Sri Juari Santosa
Molekul Vol 14, No 1 (2019)
Publisher : Universitas Jenderal Soedirman

In this paper, we report for the first time thesimple method for detection of Hg(II) ion in anaqueousmedium using silver nanoparticles capped with 3-hydroxybenzoic acid. Silver nanoparticles capped with 3-hydroxybenzoic acid were preparedby reduction of the silver ion with 3-hydroxybenzoic acid and without surface functionalization. The formation of silver nanoparticles was characterized by a UV-Visible spectrophotometer. The yellowcolloid of prepared silver nanoparticles capped with 3-hydroxybenzoic acid showed a surface plasmon resonance peak at 420 nm. The ability of silver nanoparticles capped with 3-hydroxybenzoic acid in detection was tested by doing a reaction with several metal ions individually(Na(I), K(I), Cu(II), Zn(II), Ca(II), Mg(II), Hg(II), Mn(II), Ni(II), Pb(II), and Co(II)). It was foundthat silver nanoparticles capped with 3-hydroxybenzoic acid highly selective toHg(II) and then the prepared silver nanoparticles were developedfor detection of Hg(II) ion. Addition of 1 mL Hg(II) ion into 4mL the as-preparedsilver nanoparticles reducedthe peak of surface plasmon resonance spectra, andthe reduction of peak intensity was proportional to the concentration of Hg(II) ion. A goodlinear relationship (R2= 0.998) between absorbance at 420 nm and concentrationof Hg(II) over the range 1.0x10-3to 5.5x10-3M was obtained. Silver nanoparticles capped with 3-hydroxybenzoic acid were highly sensitive to Hg (II) ion with the detection limit down to 4.7x10-5M. Application the method to the real water sample showed the excellentresult with recovery ranged from 98 to 101%. The proposed method was found to be useful forthe colorimetric detection of Hg(II) ion in an aqueousmedium.

PENGARUH SUBFRAKSINASI DAN pH TERHADAP SENSITISASI ASAM HUMAT PADA FOTOREDUKSI Cr(VI) MENJADI Cr(III) OLEH SEMIKONDUKTOR ZnO Uripto Trisno Santoso; Herdiansyah Herdiansyah; Sri Juari Santosa; Dwi Siswanta
Jurnal Sains dan Terapan Kimia Vol 1, No 1 (2007)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

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.

Two Highly Stable Silver Nanoparticles: Surface Plasmon Resonance Spectra Study of Silver Nanoparticles Capped with m-Hydroxybenzoic Acid and p-Hydroxybenzoic Acid Gusrizal Gusrizal; Sri Juari Santosa; Eko Sri Kunarti; Bambang Rusdiarso
Molekul Vol 13, No 1 (2018)
Publisher : Universitas Jenderal Soedirman

Silver nanoparticles capped with m-hydroxybenzoic acid and p-hydroxybenzoic have been successfully synthesized, but the long-term stability data of these silver nanoparticles are not available. In this paper, we report the stability of these two types of silver nanoparticles for a period of 40 weeks observation based on the change of surface plasmon resonance spectra of silver nanoparticles. Silver nanoparticles were synthesized by reduction of silver nitrate with m-hydroxybenzoic acid and p-hydroxybenzoic acid without addition of capping agent. The presence of silver nanoparticles was indicated by the appearance of yellow color due to the surface plasmon resonance of silver nanoparticles. The resulted silver nanoparticles were stored at room temperature and further UV-visible spectrophotometer was used to follow the change in surface plasmon resonance spectra. The surface plasmon resonance spectra of silver nanoparticles were overlapped for the first 18 weeks, followed by little change in the position of absorption maxima (lmax), peak intensity, and width of the absorption peak until the week of 40. Silver nanoparticles capped with m-hydroxybenzoic acid and silver nanoparticles capped with p-hydroxybenzoic acid were highly stable which should make them suitable for further applications. The results show the potential of m-hydroxybenzoic acid and p-hydroxybenzoic acid to become a new reducing agent in the synthesis of highly stable silver nanoparticles. The m-hydroxybenzoic acid and p-hydroxybenzoic acid appeared to act as both reducing and capping agent.

Material Hibrida Mg/Al-HT Terinterkalasi Asam 3,4,5-Trihidroksibenzoat Dengan Metode Kopresipitasi Melalui Mikro Reaktor-T Danar Danar; Sri Juari Santosa; Eko Sri Kunarti
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 5, No 1 (2021)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Telah berhasil disintesis Mg/Al hidrotalsit (Mg/Al-HT-ATBH) terinterkalasi asam 3,4,5-trihidroksibenzoat (ATHB) dengan metode kopresipitasi langsung melalui mikro reaktor-T. Material hibrida dikarakterisasi dengan XRD dan FT-IR. Hasil penelitian menunjukkan bahwa sintesis Mg/Al-HT-ATBH berlangsung optimum pada pH 8 dengan perbandingan mol ATHB: Mg2+ : Al3+ sebesar 0,5 : 2 : 1. Karakterisasi menggunakan FT-IR dan XRD menunjukkan bahwa ATBH terinterkalasi di dalam daerah antar lapis Mg/Al-HT menggantikan anion NO3-. Hal ini menyebabkan terjadinya pergeseran basal spacing d003 dari 11,27° menjadi 6,74° dan jarak antar lapis meningkat dari 7,84 menjadi 13,10 Å.

Penjerapan Kation Fe3+, Pb2+ Menggunakan TBKA dan TBMTKA sebagai Bahan Penjerap: Kajian Variasi pH, Kapasitas Adsorpsi, dan Waktu Kontak: Adsorption of Fe3+, Pb2+ Cations Using TBKA and TBMTKA as Adsorbents: Study of pH Variations, Adsorption Capacity, and Contact Time Busroni; Chairil Anwar; Sri Juari Santosa
Jurnal Teknologi Lingkungan Vol. 24 No. 1 (2023)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jtl.2023.242

Adsorption capacity is the most important physicochemical process that occurs at solid-liquid and solid-gas interfaces. Adsorption has become the method of choice for removing, recovering, and recycling toxic heavy metals from wastewater. Efforts to reduce the presence of heavy metals in the affected environment caused and contaminated by heavy metals in waters. The aim of this study was to measure the adsorption capacity of Pb2+ ions and Fe3+ ions by applying 5,11,17,23-tetra-(t-butil)-25,26,27,28-tetra-Hidroksi-Kaliks[4]arena (TBKA) and 5,11,17,23-tetra-tert-butil-25-monohidroksi-26,27,28tribenzoiloksi kaliks[4]arena (TBMTKA) adsorbents with varying pH. Characterization of TBMTKA using FT-IR and 1H-NMR spectroscopy. TBKA and TBMTKA are used as adsorbents for Pb2+ ions and Fe3+ ions. The results showed that variations in pH affected the adsorption capacity by TBMTKA of Pb2+ and Fe3+ ions. The adsorption capacity of TBMTKA on Pb2+ ions with a large variation in pH was 6.32; 2.16; 4.14; 10.52; and 2.88 mg/g, while the adsorption capacity by TBKA for Fe3+ ions was 8.4; 13.32; 11.6; 14.18; and 6.66 mg/g. Abstrak Kapasitas adsorpsi merupakan proses fisika-kimia terpenting yang terjadi pada zat padat-cair dan antarmuka padat-gas. Adsorpsi telah menjadi pilihan metode untuk menghilangkan, memulihkan, dan mendaur ulang racun logam berat dari air limbah. Upaya untuk mengurangi keberadaan logam berat di lingkungan terdampak yang ditimbulkan dan terkontaminasi logam berat di perairan. Penelitian bertujuan menentukan kapasitas adsorpsi ion Pb2+ dan ion Fe3+ dan mengaplikasikan bahan adsorben 5,11,17,23-tetra-(t-butil)-25,26,27,28-tetra-Hidroksi-Kaliks[4]arena (TBKA) dan 5,11,17,23-tetra-tert-butil-25-monohidroksi-26,27,28tribenzoiloksi kaliks[4]arena (TBMTKA) dengan berbagai variasi pH. Karakterisasi TBKA dan TBMTKA dengan spektroskopi FTIR dan 1H-NMR. masing masing sebagai bahan penjerap terhadap ion Pb2+ dan ion Fe3+. Hasil penelitian diperoleh bahwa variasi pH berpengaruh pada kapasitas adsorpsi ion Pb2+ dan Fe3+. Kapasitas adsorpsi oleh TBMTKA terhadap ion Pb2+ dengan variasi pH besarnya adalah 6,32; 2,16; 4,14; 10,52; dan 2,88 mg/g, sedangkan kapasitas adsorpsi oleh TBKA terhadap ion Fe3+ adalah 8,4; 13,32; 11,6; 14,18; dan 6,66 mg/g.

Co-Authors - Jumaeri Ajuk Sapar Andi Hairil Alimuddin Bambang Rusdiarso Busroni Chairil Anwar Danar Danar Dwi Siswanta Eko Sri Kunarti Gusrizal Gusrizal Herdiansyah Herdiansyah Holyness Nurdin Singadimedja Nurul Ismillayli Rizki Noviani Ridwan Soerja Koesnarpadi Uripto Trisno Santoso

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