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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI Communications in Science and Technology Greensphere: Journal of Environmental Chemistry Analit: Analytical and Environmental Chemistry
Ahmad Suseno
Chemistry Department, Faculty Of Sciences And Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang|Diponegoro University|Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Mathematics Physics

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Pereduksian COX, NOX, SOX, HC dari Kendaraan Bermotor dengan Menggunakan Plasma Non-Termik Nur, Muhammad; Wirawan, Bukit Yuta; Adi Wijaya, Wahyu; Suseno, Ahmad; Sumariyah, Sumariyah
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Reduction NOX gas from motor vehicle 1486 cc emission have been done by using corona glow discharge plasma which awakened with power source from modified system ignition of car.NOX Gas is result emission of motor vehicle 1486 cc at 2000 rpm. Flow NOX source are joined with reactor. Corona glow discharge plasma awakened in the reactor with knife to plane electrode geometry configuration with power source from modified system ignition of car. Corona that happened in reactor which containing of motor vehicle gas emission 1496 cc will yield ion, electron, and energetic radical. NOX will turn into compounds which do not dangerous and it’s indicate that pollutants in reactor was reduced.  To get the decomposition efficiency of NOX it’s require to be done the measurement of concentration of NOX before and after reduced. The biggest decomposition efficiency of NOX which obtained in this research is 81.38 % at distributor rotation equal to 1500 rpm with current equal to 80µA. Anion and cation analysis show there are cation NH4+ and anion CO32-, SO32-, and SO42-, that giving hypothesize that one of compiler compound of crust result of system prototype to reduce NOX are ammonium carbonate ((NH4)2CO3), ammonium sulfide ((NH4)2SO3), and ammonium sulphate ((NH4)2SO4).
Pengaruh Jumlah Katalis Zeolit Alam Asam dalam Proses Perengkahan Asap Cair Tempurung Kelapa Windari, Tri; Suseno, Ahmad
JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 3 Year 2011
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Telah dilakukan penelitian tentang pengaruh jumlah katalis zeolit alam asam dalam proses perengkahan asap cair tempurung kelapa. Katalis zeolit alam asam dibuat dengan aktivasi, kalsinasi dan proses hidrotermal zeolit alam wonosari. Karakter katalis meliputi rasio Si/Al, keasaman, luas permukaan, volume pori dan rerata jejari pori, masing-masing ditentukan dengan Spektroskopi Serapan Atom (AAS), metode adsorpsi NH3 dan BET surface area analyzer. Perengkahan asap cair tempurung kelapa dengan variasi berat katalis dilakukan dengan reactor batch dan produk cair yang diperoleh dianalisis dengan GC dan GC-MS. Hasil preparasi katalis menghasilkan katalis zeolit alam asam dengan Rasio Si/Al = 10,25, keasaman = 5,18 mmol/gram, luas permukaan = 96,60 (m2/g) volume pori = 51,00. 10-3 (cc/g) dan rerata jejari pori = 10,56 (Ã…). Proses perengkahan asap cair tempurung kelapa efektif terjadi pada penggunaan katalis seberat 2 gram. Keywords: asap cair, perengkahan, katalis
Konversi Termal Campuran Polietilena-Tempurung Kelapa Menjadi Hidrokarbon Cair Windari, Tri; Suseno, Ahmad
JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 2 Year 2011
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Telah dilakukan penelitian tentang konversi termal campuran polietilena-tempurung kelapa menjadi hidrokarbon cair melalui proses pirolisis dan pirolisis katalitik menggunakan katalis zeolit alam. Katalis zeolit alam dibuat melalui 3 tahap yaitu: aktivasi, kalsinasi dan proses hidrotermal. Enam puluh gram campuran polietilena-tempurung kelapa dengan perbandingan 5:1, 4:2, 3:3, 2:4, 1:5 dipirolisis pada temperatur 300°C. Uap organik yang dihasilkan kemudian didinginkan sehingga diperoleh produk cair. Untuk proses pirolisis katalitik, prosedurnya sama, hanya dilakukan penambahan katalis pada reaktor. Produk cair kemudian dianalisis dengan GC dan GC-MS. Dari keseluruhan proses menunjukkan bahwa volume produk cair pirolisis dan pirolisis katalitik campuran polietilena-tempurung kelapa makin meningkat dengan meningkatnya jumlah polietilena di dalam campuran. Data GC dan GC-MS menunjukkan bahwa proses pirolisis menghasilkan produk utama berupa senyawa hidrokarbon rantai karbon C4 – C11 dan proses pirolisis katalitik menghasilkan senyawa hidrokarbon rantai karbon C8 – C12.   Keywords: pirolisis, pirolisis katalitik, hidrokarbon cair
Sintesis Lempung Terpilar Titania Darmawan, Adi; Suseno, Ahmad; Purnomo, Slamet Agus
Jurnal Kimia Sains dan Aplikasi Vol 8, No 3 (2005): Volume 8 Issue 3 Year 2005
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (416.936 KB) | DOI: 10.14710/jksa.8.3.61-68

Abstract

Sintesis lempung terpilar Titania dilakukan dengan cara interkalasi larutan pemilar titanium pada lempung dilanjutkan dengan kalsinasi. Suhu kalsinasi divariasi untuk melihat pengaruhnya terhadap basal spacing, stabilitas termal, angka keasaman, situs asam Bronsted-Lewis dan luas permukaan lempung terpilar.Karakterisasi basal spacing dan stabilitas termal menggunakan XRD, angka keasaman dan situs asam Bronsted-Lewis menggunakan adsorpsi piridin/IR dan luas permukaan menggunakan metode adsorpsi gas nitrogen melalui persamaan BET. Hasil analisis menunjukkan bahwa lempung terpilar TiO2 mempunyai basal spacing 17,80 Ǻ, stabilitas termal pada suhu 200oC, keasaman 2,3575 mmol/gram, keberadaan situs asam Bronsted-Lewis seimbang dan luas permukaannya 169,151 m2/g .Hasil ini menunjukkan karakter dari lempung terpilar TiO2 untuk kepentingan adsorpsi atau katalis akan lebih maksimal. Sehingga lempung terpilar TiO2 siap untuk aplikasi lebih lanjut sesuai kebutuhan yang diinginkan.
Pembuatan dan Karakterisasi Katalis Nikel pada Padatan Pendukung Zeolit Suseno, Ahmad; Khanif, Muhammad; Wijayanto, Wahyu; Hastuti, Rum
Jurnal Kimia Sains dan Aplikasi Vol 6, No 1 (2003): Volume 6 Issue 1 Year 2003
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1847.887 KB) | DOI: 10.14710/jksa.6.1.7-10

Abstract

Pembuatan katalis Ni-Zeolit telah dilakukan dengan cara pertukaran ion larutan nikel nitrat pada padatan pendukung zeolit alam.Karakterisasi katalis dilakukan dengan AAS yang bertujuan untuk menentukan kandungan logam. Sifat keasaman permukaan padatan katalis dtentukan melalui adsorpsi gas ammonia secara grafimetri dan spektroskopi IR. Kajian dilakukan terhadap hubungan antara beberapa parameter diantaranya konsentrasi larutan ion ammonium, kondisi reduksi pada proses pembuatan katalis.Hasil penelitian menunjukkan bahwa logam Ni berhasil dimasukkan pada padatan zeolit dengan konsentrasi ion amonium 2,0 M dan temperatur reduksi 400 oC mampu menukarkan logam nikel terbanyak serta menghasilkan tingkat keasaman katalis tertinggi.
Preparasi Katalis Zeolit Alam Asam sebagai Katalis dalam Proses Pirolisis Katalitik Polietilena Windarti, Tri; Suseno, Ahmad
Jurnal Kimia Sains dan Aplikasi Vol 7, No 3 (2004): Volume 7 Issue 3 Year 2004
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (251.038 KB) | DOI: 10.14710/jksa.7.3.72-77

Abstract

Telah dilakukan penelitian tentang preparasi katalis zeolit alam asam sebagai katalis dalam proses pirolisis katalitik polietilena. Katalis zeolit alam asam dibuat melalui aktivasi dan kalsinasi zeolit alam Wonosari yang meliputi perendaman dalam larutan HF 1 %, perlakuan HCl, perendaman dalam larutan NH4Cl dan kalsinasi dengan dan tanpa gas N2. Proses kalsinasi dilakukan pada temperatur 500 C. Karakter katalis yang meliputi rasio Si/Al, keasaman, luas permukaan, volume pori dan rerata jejari pori, masing-masing ditentukan dengan Spektroskopi Serapan Atom (AAS), metode adsorpsi NH3 dan alat penganalisis luas permukaan. Hasilnya adalah preparasi telah meningkatkan keasaman zeolit sebesar 132,5 %, rasio Si/Al sebesar 146,9 %, luas permukaan sebesar 748 %, volume pori sebesar 98 % dan menurunkan rerata jejari pori sebesar 76 %. Proses pirolisis dan proses pirolisis katalitik dilakukan dengan reactor bach dan produk cair dianalisis dengan GC dan GC-MS serta FTIR. Produk proses pirolisis polietilena adalah olefin C9 – C15 sedangkan produk pirolisis dengan katalis zeolit alam asam adalah olefin C5 – C12.
Pembuatan Katalis Pd-Ce/γ –Al2O3 dan Uji Aktivitas terhadap Oksidasi Metana Suseno, Ahmad; Triyono, Triyono; Setiaji, Bambang
Jurnal Kimia Sains dan Aplikasi Vol 2, No 3 (1999): Volume 2 Issue 3 Year 1999
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7361.868 KB) | DOI: 10.14710/jksa.2.3.104-111

Abstract

Effects of Ce addition on Pt/γ - Al2O3 catalysts preparation and their catalytic activity on oxidation of methane have been investigated. In this study, the catalysts were prepared by impregnating chloride salt solution of palladium and sulphate salt of cerium on γ-AI2O3 support. Characterization of catalysts was conducted by gas sorption method to determine surface area, pore radius and pore volume. The test of catalytic activity on oxidation of methane was carried out in a flow reactor system at a temperature range from 350°C to 600°C. Products of reaction were analysed by non-dispersive IR spectroscopy. It was observed that the surface area, pore radius and pore volume decrease with the addition of cerium. The results of oxidation process showed that Pd-Ce/γ-Al2O3 catalyst can be used for oxidation of methane up to 90.62% conversion
Synthesis of Surfactant-Modified Activated Carbon (SMAC) Above Critical Micelle Concentration as Cr(VI) Ion Adsorbent Arnelli Arnelli; Sri Guswini; Ahmad Suseno
Jurnal Kimia Sains dan Aplikasi Vol 25, No 5 (2022): Volume 25 Issue 5 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (364.731 KB) | DOI: 10.14710/jksa.25.5.179-184

Abstract

The synthesis of surfactant-modified activated carbon (SMAC) has been widely studied. However, no research has been conducted to study SMAC concentrations higher than the critical micellar concentration. Therefore, in this study, SMAC was synthesized using anionic and cationic surfactants above CMC (Critical Micelle Concentration) and compared with SMAC below CMC and coconut husk-based activated carbon. This study aimed to determine the surface profile of SMAC and the characteristics and mechanism of metal ion adsorption by SMAC. The selected metal ions were Cr(VI) cations and NH4+ cations as a reference. SMAC was prepared by modifying coconut shell-based activated carbon with anionic surfactant SLS (Sodium Lauryl Sulfate) and cationic surfactant HDTMA-Br (Hexadecyl Trimethyl Ammonium Bromide). Modification of SMAC was performed by three different methods: (a) activated carbon was added gradually with SLS followed by HDTMA-Br, (b) activated carbon was added with HDTMA-Br followed by SLS, (c) activated carbon was mixed with SLS and HDTMA-Br simultaneously. All synthesized SMAC were characterized using FTIR, GSA (Gas Sorption Analyzer), and zeta potential. The FTIR analysis results showed that the synthesized SMAC comprised S=O and (CH3)3N+ groups derived from surfactants. GSA analysis revealed that SMAC has a surface area of 36.790 m2/g, and it was more stable than activated carbon according to the zeta potential result. In this study, the efficiency of SLS and HDTMA-Br in synthesizing SMAC was 99.98% and 95.85%, respectively. SMAC synthesis using method c resulted in Cr(VI) adsorption efficiency of 93.50% and NH4+ adsorption efficiency of 87.37%. In comparison, SMAC below CMC has adsorption capacities of 93.41% for Cr(VI) and 85.05% for NH4+, respectively, whereas Cr(VI) adsorption efficiency by coconut shell-based activated carbon was 99.98%.
Synthesis of Sodium Lauryl Sulfate (SLS) and Hexadecyltrimethylammonium Bromide (HDTMA-Br) Surfactant-Modified Activated Carbon as Adsorbent for Pb2+ and NO3- Arnelli Arnelli; Rahmatul Fazira; Yayuk Astuti; Ahmad Suseno
Jurnal Kimia Sains dan Aplikasi Vol 23, No 11 (2020): Volume 23 Issue 11 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2977.337 KB) | DOI: 10.14710/jksa.23.11.396-402

Abstract

The adsorption efficiency and selectivity of activated carbon as an adsorbent for ions can be improved. One way is to convert activated carbon into surfactant modified activated carbon (SMAC). The surfactants used in this study were the anionic surfactant Sodium Lauryl Sulfate (SLS) and the cationic surfactant hexadecyltrimethylammonium bromide (HDTMA-Br). This research aims to synthesize SMAC to obtain a material with a surface charge and absorb ions better than activated carbon. This research consisted of four stages. The first step was the carbonization of rice husks using a pyrolysis reactor at 400°C for 1 hour. The second stage was carbon activation using 30% ZnCl2 and microwave radiation for 5 minutes and 400 W. The third stage was the modification of activated carbon and characterization by FTIR, SEM, SAA. The fourth stage was the adsorption of Pb cations and nitrate anions by carbon, activated carbon, and SMAC. Several variables were applied, such as the type of surfactant, time, and method of modification. There are three ways of modification: (1) method A, in which activated carbon is brought into contact with SLS then HDTMA-Br. (2) Method B in which activated carbon was contacted with HDTMA-Br then SLS. (3) Method C in which activated carbon was brought into contact with SLS together with HDTMA-Br. All variables were investigated. The results showed that the optimum time for making SMAC for both surfactants was 4 hours, the optimum concentrations of SLS and HDTMA-Br were 60 and 300 ppm, respectively. SMAC made by the C method was the most effective at adsorbing Pb2+ and NO3- with adsorption capacities of 1.376 and 0.896 mg/g, respectively. The success of SMAC synthesis was evidenced by the S=O and (CH3)3N+ groups in the FTIR spectra. The SMAC surface area is smaller than activated carbon, 14.472 m2/g, but the surface morphology is smoother and more homogeneous.
Pengaruh Tripolifosfat Sebagai Agen Taut Silang Pada Membran Kitosan Terhadap Karakter Fisikokimia dan Kemampuan Permeasi Retno Ariadi Lusiana; Ahmad Suseno; Khabibi Khabibi; Cahyaning Gesti Faradina
Greensphere: Journal of Environmental Chemistry Vol 1, No 1 (2021): Volume 1 Issue 1 tahun 2021
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (816.236 KB) | DOI: 10.14710/gjec.2021.10898

Abstract

Penelitian tentang modifikasi membran kitosan dengan taut silang menggunakan tripolifosfat telah dilakukan. Tujuan penelitian adalah untuk memodifikasi kitosan dengan tripolifosfat dan mengkarakterisasi serta menguji permeabilitasnya. Pada penelitian ini dihasilkan larutan dope kitosan tertaut silang tripolifosfat (CSTPP) dengan tiga rasio kitosan:tripolifosfat yaitu 1:0,5; 1:1; dan 1:2. Melalui metode inversi fasa didapatkan lembaran membran yang dipergunakan dalam proses permeasi kreatinin. Berdasarkan hasil karakterisasi Hasil karakterisasi menunjukkan bahwa modifikasi kitosan oleh TPP berpengaruh pada sifat fisikokimia membran. Kenaikan konsentrasi TPP dalam membran berkorelasi dengan peningkatan hidrofilisitas, nilai serapan air, derajat pengembangan, porositas, kemampuan fluks dan kemampuan permeasi membran.  Membran CSTPP2 dengan rasio mol 1:1 antara kitosan:TPP memiliki kemampuan permeasi terbaik.Kata Kunci: taut silang; membran, CSTPP, permeasi
Co-Authors Abdul Haris Adi Darmawan Alfiansyah Alfiansyah Ari Kurniawan Arnelli Arnelli Ayub Indra Bambang Setiaji Bara Yunianto Fathoni Briyanto Briyanto Bukit Yuta Wirawan Cahyaning Gesti Faradina Chandra Ady Nugroho Diana Pratiwi Rusendi Didik Setiyo Widodo Diyan Arini Eddy Heraldy Fahmi Syafaat Fitri Anawati Fitriani Solichah Gunawan Gunawan Iqmal Tahir Irine Ayu Febiyanti Juwita Kesumaningrum Karna Wijaya khabibi Khabibi Khanif, Muhammad Lukman Hakim Marina Adriati Mariza Umi Darmayanti Muhammad Nur Nabila Iftinan Sari Nor Basid Adiwibawa Prasetya Nurwarrohman Andre Sasongko Oh, Won-Chun Pratika, Remi Ayu Priyono Priyono Purnomo, Slamet Agus Puspitasari Puspitasari Rahma Wahyu Widyastuti Rahmatul Fazira Retno Ariadi Lusiana Rum Hastuti Saviola, Aldino Javier Setyono, Risandrika Dwijayanti Putri Sri Guswini Sumariyah Sumariyah Taslimah Taslimah Teguh Iman Prastyo Tri Windari Tri Windarti Triyono Triyono Wahyu Adi Wijaya Wahyu Sri Kunto Nugroho Wahyu Wijayanto Yayuk Astuti