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All Journal VALENSI CHEMISTRY PROGRESS Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia KOVALEN: Jurnal Riset Kimia Indonesia Chimica Acta Panrita Abdi - Jurnal Pengabdian pada Masyarakat Chemistry Indonesian Journal of Chemical Research

Yusafir Hala

Chemistry Department, Mathematics And Natural Sciences, Hasanuddin University, Perints Kemerdekaan Street Km 10, Tamalanrea, Makassar

Author-ID : 273067

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Environmental Science Other

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Articles

Proses Transesterifikasi Biji Minyak Jarak Dengan Bantuan Enzim Lipase Sebagai Penghasil Biodiesel Hala, Yusafir; Jufri, Muh. Zulkifli; Tambung, Astina
Indonesia Chimica Acta Volume 2 No 1 - June 2009
Publisher : Indonesia Chimica Acta

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

The investigation was carried out to prevent the scarce of fosil based fuel. In this investigation used seed of castor oil plan (Jathropha curcas L.) as natural row material to make castor oils and converted to biodiesel so that itâs friendly to the biological environment. Castor oils produced by extraction process with soxhletation methods used n-hexane solvent. The result of extraction then converted to biodiesel by transesterification process at optimum temperature 40o C with methanol and catalyzed with lipase enzyme. Free fatty acid analysis and total fat analysis was done to the result product, and then biodiesel converted value as 88.67% gotten. Some characteristics analysis of biodiesel castor oils like density, viscosity, pouring point, flaming point, and caloric value according ASTM D6751. The result of investigation showed castor oils biodiesel can be used as diesel fuel.Keywords : fuel, castor oils, biodiesel, transesterfication, and optimum temperature.

BIOSORPSI CAMPURAN LOGAM PB2+ DAN ZN2+ OLEH CHAETOCEROS CALCITRANS Hala, Yusafir; Suryati, Emma; Taba, Paulina
CHEMISTRY PROGRESS Vol 5, No 2 (2012)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.5.2.2012.772

Penelitian ini bertujuan untuk menentukan dampak jerapan campuran ion logam Pb(II) dan Zn(II) terhadap pertumbuhan mikroalga Chaetoceros calcitrans dan menentukan efisiensi penjerapan kedua ion logam dalam campuran. Pemaparan ion logam dengan berbagai variasi konsentrasi Pb(II) terhadap Zn(II)dilakukan setelah diperoleh pertumbuhan optimum C. calcitrans, yakni pada hari ke-9. Konsentrasi ion logam Pb(II) dan Zn(II) setelah pemaparan ditentukan dengan spektrofotometer serapan atom. Penambahan ion Pb(II) ke dalam Zn(II)membuat penjerapan ion Zn(II) oleh C. calcitrans turun dibandingkan dengan penjerapan ion tunggal Zn(II). Hal yang sama juga terjadi pada penambahan ion Zn(II)ke dalam ion Pb(II). Hasil penelitian menunjukkan bahwa ion Pb(II) lebih banyak terjerap oleh C. calcitrans dibanding ion Zn(II). Effisiensi penjerapan optimum ion Pb(II) sebesar 64,44% pada perbandingan konsentrasi Pb(II) terhadap Zn(II) 45 : 30 ppm sedangkan penjerapan ion Zn(II) yaitu 56,33% pada perbandingan konsentrasi Zn(II) terhadap Pb(II) 15 : 30 ppm.The main purpose of this research was to determine the adsorption effect of the mixture of Pb(II) and Zn(II) on the growth of Chaetoceros calcitrans and to determine the adsorption efficiency of the ions in the mixture. Exposure of Pb(II) and Zn(II)ions was conducted after the optimum growth of C. calcitrans was obtained, that is at the ninth day with the variation of the concentration ratio of Pb(II) to Zn(II). Concentration of Pb(II) and Zn(II) ions after exposure was determined by atomic absorption spectrophotometer. Addition of Pb(II) ion in solution Zn(II) ion resulted in the decrease of the Zn(II)ion adsorbed by C. calcitrans compared to the adsorption of the single ion of Zn(II). The same result was obtained when Zn(II) ion was added in Pb(II) solution. Results showed that the adsorption of Pb2+ ion by C. calcitrans was higher than that of Zn(II) ion. The maximum adsorption efficiency of Pb(II) ion was 64.44% at the Pb(II):Zn(II) ratio of 45:30, whereas that of Zn(II)ion was 56.33% at the Zn(II):Pb(II) ratio of 15:30.

Biosorpsi Ni2+ oleh Nannochloropsis Salina pada Medium Terpapar Ca2+ Yusafir Hala; Muhammad Zakir; Emma Suryati; Karuniawati Azis
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 1, Mei 2015
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v0i0.3153

Research on biosorption of Ni2+ by N. salina in Ca2+ exposed medium has been done. This study aimed to determine the growth and efficiency of N. salina towards Ni2+ in Conwy Medium with addition of Ca2+. Exposure of mixed ions of Ni2+ 5 ppm and Ca2+ with variation of concentrations 10, 30, 50 ppm was conducted at the beginning of the growth of N. salina. The growth of N. salina was observed every day by counting the number of N. salina population using a microscope and haemocytometer. The concentration of metal ions after the exposure was determined by atomic absorption spectrophotometer. The growth of N. salina in medium with exposed metal ions is lower than the control. The maximum sorption efficiency of Ni2+ as a single ion is 55.2%. After exposure of mixed ions of Ni2+ and Ca2+ with variation of concentrations 10, 30, 50 ppm, the sorption efficiency of Ni2+ in sequents are 17.6%; 17.8%; and 19.6%; while the maximum sorption efficiency of N. salina towards Ca2+ are 5.1%; 7.1%; and 4.0% respectively.DOI :http://dx.doi.org/10.15408/jkv.v0i0.3153

FORMULASI PAKAN UNGGUL BERBASIS BIOTEKNOLOGI LIMBAH ORGANIK LOKAL UNTUK IKAN LELE ORGANIK KUALITAS EKSPOR Yusafir Hala; syahruddin udin kasim; Indah Raya
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 2 (2019): Edisi Agustus
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Research on Superior Feed Formulations Based on Local Organic waste Biotechnology for Export quality organic Catfish. Research Objective: The discovery of feed types of tilapia and organic catfish that have export quality nutritional content based on the best quality local marine organic waste through a touch of biotechnology. Furthermore, the complete chemical composition of the waste used and feed components is obtained. Research Methods: Determine the best composition of biomass of marine organic waste and local onshore organic wastes with the highest levels of protein and carbohydrates and integrated with other wastes. The nutritional content is analyzed, namely: Carbohydrates, fats, proteins, and supporting minerals, namely: Fe, K and Ca. Instrumentation used to support the research objectives is AAS and HPLC. Research Results: Export quality organic catfish pellet feed in the form of waste: marine fish, sea shrimp waste, sea crab waste, rice bran waste, corn waste, mixed organic waste, golden snail waste, seaweed waste and coconut water waste respectively (27; 15; 7.5; 33; 3; 2.5; 5; 2.5 and 2) %b/ b, starch 2% b/b and marine phytoplankton biomass 0.5% b/b. The nutritional content of organic catfish pellets that have been produced, namely: 51% protein b/b, 24% carbohydrate b/b, 9% fat b/b, crude fiber 8%b/b, water content 2 - 2.5%b/b, mineral Fe 1% b/b, mineral K 1% b/b, mineral Ca 1%b/b, ash content 2 - 2.5%b/b. Feed packing for export quality organic catfish pellets is given the "SANTARI-KU" label. Keywords: Superior feed, local organic waste biotechnology, export quality organic catfish, Santari-ku.

Proses Transesterifikasi Biji Minyak Jarak Dengan Bantuan Enzim Lipase Sebagai Penghasil Biodiesel Yusafir Hala; Muh. Zulkifli Jufri; Astina Tambung
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) Volume 2 No 1 - June 2009
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/ica.v2i1.975

The investigation was carried out to prevent the scarce of fosil based fuel. In this investigation used seed of castor oil plan (Jathropha curcas L.) as natural row material to make castor oils and converted to biodiesel so that it’s friendly to the biological environment. Castor oils produced by extraction process with soxhletation methods used n-hexane solvent. The result of extraction then converted to biodiesel by transesterification process at optimum temperature 40o C with methanol and catalyzed with lipase enzyme. Free fatty acid analysis and total fat analysis was done to the result product, and then biodiesel converted value as 88.67% gotten. Some characteristics analysis of biodiesel castor oils like density, viscosity, pouring point, flaming point, and caloric value according ASTM D6751. The result of investigation showed castor oils biodiesel can be used as diesel fuel.Keywords : fuel, castor oils, biodiesel, transesterfication, and optimum temperature.

PELATIHAN PENGUKURAN EMISI GAS KARBON MONOKSIDA (CO) DAN NITROGEN OKSIDA (NOX) PADA KENDARAAN BERMOTOR DI SMA NEGERI 2 BONE Abdul Wahid Wahab; Nursiah La Nafie; Musa Ramang; Indah Raya; Yusafir Hala
Panrita Abdi - Jurnal Pengabdian pada Masyarakat Vol. 3 No. 2 (2019): Jurnal Panrita Abdi - Oktober 2019
Publisher : LP2M Universitas Hasanuddin

Training Of Carbon Monoxide (CO) Gas and Nitrogen Oxide (NOx) Measurement Emissions In Motor Vehicles at State High School 2 BoneAbstract. Every year the population in Bone Regency was increased. The increasing population every year has meant the transportation need will be increase because to support mobility and community activities in Bone Regency, Its means that transportation is absolutely necessary. Based on BPS data from Bone Regency, in 2016 the population was 746.973 people. The increasing number of motorized vehicles from year to year will cause air pollution. Environmental conditions in Bone Regency are declining due to high human activities, namely household activities that have reached 14%, industry 18%, commercial 3%, others 9% and means of transportation 56%. To produce good environmental conditions, especially at the location of Senior High School 2 Bone-in Bone Regency, we held community service by introducing and applying and utilizing PEM-9004 instrument to measure carbon monoxide (CO) and nitrogen oxide (NOx) gas emissions in motorized vehicles in particular vehicles belonging to teachers and students at Senior High School 2 Bone. The measurement results showed CO gas emissions on matic motors which were 0.087%, NO gas emissions by 32 ppm and NOx at 33 ppm. While the percentage of CO and NOx gas emissions in duck motors is 0. During the measurement, there was also a decrease in gas emission temperature from 38.6oC to 36.9oC with a testing time of 60 seconds each. Based on the results of the activity data, it is obtained that the percentage of CO and NOx gas emissions of the motorbike is greater than the duck motor of teachers and students at Senior High School 2 Bone.Keywords: PEM-9004, carbon monoxide (CO), nitrogen oxide (NOx), Senior High School 2 BoneAbstrak. Setiap tahun jumlah penduduk di Kabupaten Bone mengalami peningkatan. Semakin meningkatnya jumlah penduduk setiap tahunnya, maka sarana transportasi akan semakin meningkat karena untuk menunjang mobilitas dan aktivitas masyarakat di Kabupaten Bone maka sarana transportasi merupakan kebutuhan yang mutlak diperlukan. Berdasarkan data BPS Kabupaten Bone, tahun 2016 jumlah penduduk sebesar 746.973 jiwa. Meningkatnya jumlah kendaraan bermotor dari tahun ke tahun akan menimbulkan polusi udara. Kondisi lingkungan di daerah Kabupaten Bone semakin menurun karena tingginya aktivitas manusia yaitu kegiatan rumah tangga telah mencapai 14%, industry 18%, komersial 3%, lainnya 9% dan sarana transportasi 56%. Untuk menghasilkan kondisi lingkungan yang asri khususnya di lokasi SMA Negeri 2 Bone Kabupaten Bone maka diadakan pengabdian masyarakat dengan cara pengenalan dan pengaplikasian serta pemanfaatan Alat PEM-9004 untuk mengukur emisi gas karbon monoksida (CO) dan nitrogen oksida (NOx) pada kendaraan bermotor khususnya kendaraan milik guru dan siswa di SMA Negeri 2 Bone. Hasil pengukuran menunjukkan emisi gas CO pada motor matic yaitu 0,087%, emisi gas NO sebesar 32 ppm dan NOx sebesar 33 ppm. Sedangkan presentase emisi gas CO dan NOx pada motor bebek yaitu 0. Selama pengukuran juga terjadi penurunan suhu emisi gas dari 38,6 oC menjadi 36,9 oC dengan waktu pengujian masing-masing 60 detik. Berdasarkan data hasil kegiatan tersebut maka diperoleh bahwa presentase emisi gas CO dan NOx motor matic lebih besar di bandingkan dengan motor bebek milik guru dan siswa di SMA Negeri 2 Bone.Kata kunci: PEM-9004, karbon monoksida (CO), nitrogen oksida (NOx), SMA Negeri 2 Bone

Adsorption of Tetracycline Hydrochloride from Solutions Using Mesoporous Silica, MCM-48 Paulina Taba; Mutmainnah Mutmainnah; Yusafir Hala
Indonesian Journal of Chemical Research Vol 8 No 3 (2021): Edition for January 2021
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2021.7-mut

Mesoporous silica with cubic structure (MCM-48) was synthesized using Ludox HS40 as silica source and cetyltrimethylammonium bromide (CTAB) as a template. MCM-48 was used to adsorb the antibiotic of tetracycline hydrochloride. An X-ray diffractometer observed the x-ray diffraction pattern of MCM-48 and functional groups observed by a Fourier Transformed Infrared (FTIR) spectrometer. Parameters used to study adsorption were contact time and concentration. The pseudo-second-order was the kinetic order that fitted well with the adsorption of tetracycline HCl. The adsorption of tetracycline HCl on MCM-48 followed the Freundlich isotherm with the adsorption capacity of 0.98 mg/g.

Mesoporous Silica MCM-48 as Chloramphenicol Adsorbent Paulina Taba; Miftahul Jannah; Yusafir Hala
Indonesian Journal of Chemical Research Vol 8 No 3 (2021): Edition for January 2021
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2021.7-mif

This study is aimed to determine the potential use of MCM-48 to adsorb chloramphenicol pollution. Chloramphenicol adsorption was conducted at various times contact and concentration. Adsorption isotherm was studied by comparing Langmuir and Freundlich adsorption isotherm. The results showed that chloramphenicol adsorption was suited to Freundlich isotherm with an optimum contact time of 80 minutes

Sintesis p-tert-butilkaliks[4]arena-tetra-n-(etilglisil)asetamida untuk Digunakan Sebagai Pengemban Ion pada Pemisahan Ion-Ion Logam Berat dengan Transpor Membran Cair Maming .; Firdaus .; Yusafir Hala
Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia Vol 9, No 2 (2008)
Publisher : Jurusan Kimia FMIPA UNM

ABSTRAK Telah dilakukan penelitian sintesis p-tert-butilkaliks[4]arena-tetra-N-(etilglisil)-asetamida untuk digunakan sebagai pengemban ion pada pemisahan ion logam berat dengan transpor membran cair. Senyawa pengemban ion tersebut disintesis dari p-t-butilkaliks[4]arena dengan N-etilglisilasetamida. Senyawa N-etilglisil-asetamida diperoleh dari hasil reaksi antara asam 2-kloroasetat dengan SOCl2 yang diteruskan dengan penambahan HCl.H-Gly-OEt. Senyawa p-t-butil-kaliks[4]arena-tetra-N-(etilglisil)asetamida berupa kristal berwarna coklat kekuningan (75%), t.l.70 ºC, larut dalam kloroform, dan tidak larut dalam air dan n-heksana. Kata Kunci: sintesis, pengemban ion, p-t-butilkaliks[4]arena-tetra-N-(etilglisil)asetamida ABSTRACT Synthesis of p-tert-butylcalix[4]arene-tetra-N-(ethylglycil)acetamide which will used as ion carrier in separation heavy metal ions by liquid membrane transport has been conducted. The compound was synthesized from p-tert-butylcalix[4]arene and N-glycilacetamide. The N-glycilactamide compound was prepared by reaction of 2-cloroacetic acid with thionyl chloride followed by amidation with HCl.H-Gly-OEt. By this method it was obtained p-tert-butylcalix[4]arene-tetra-N-(ethylglycil)-acetamide compound as yellowish brown crystal (75%), m.p. 70 ºC, soluble in chloroform, and insoluble in both water and n-hexane. Keyword: synthesis ion, p-tert-butilkaliks[4]arena-tetra-N-(etilglisil)asetamida

PELATIHAN GURU DAN SISWA TENTANG PENGUKURAN EMISI GAS KARBON MONOKSIDA (CO) DAN NITROGEN OKSIDA (NOX) PADA KENDARAAN BERMOTOR Abdul Wahid Wahab; Nursiah La Nafie; Paulina Taba; Yusafir Hala; Maming; Abdul Karim; Andi Muhammad Anshar; Triana Febrianti; Nuritasari Azis
Panrita Abdi - Jurnal Pengabdian pada Masyarakat Vol. 7 No. 3 (2023): Jurnal Panrita Abdi - Juli 2023
Publisher : LP2M Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/pa.v7i3.22908

Maros Regency is a crossing area to the city of Makassar. So, transportation facilities to support mobility and community activities in several places to the city of Makassar must go through the town of Maros. Therefore, the number of vehicles that pass through the city of Maros will continue to increase from year to year, which will cause pollution or air pollution for the environment. To achieve beautiful environmental conditions, especially at the location of Senior High School 1 Maros, it is necessary to hold community service by introducing, applying, and utilizing the PEM-9004 tool on motorized vehicles, especially vehicles belonging to students at Senior High School 1 Maros. The test results show that the emission levels of carbon monoxide (CO) gas from students' vehicles are 1.791%, the levels of nitrogen oxides (NOx) and nitrogen monoxide (NO) are seven ppm each, and the gas temperature is 45°C with a test time of 1 minute. The CO concentration is still below the threshold set by the government in the Regulation of the State Minister for the Environment No. 05 of 2006, which is the concentration of CO gas emitted by motor vehicles with gasoline fuel at idle conditions of ≤5.5%. --- Kabupaten Maros adalah daerah perlintasan menuju kota Makkassar. Sehingga sarana transportasi untuk menunjang mobilitas dan aktivitas masyarakat di beberapa daerah menuju kota Makassar harus melalui kota Maros. Oleh karena itu, jumlah kendaraan yang melewati kota Maros akan terus meningkat dari tahun ke tahun yang akan menimbulkan pencemaran atau polusi udara bagi lingkungan. Untuk menghasilkan kondisi lingkungan yang asri khususnya di lokasi SMA Negeri 1 Maros maka perlu diadakan pengabdian masyarakat dengan cara pengenalan dan pengaplikasian serta pemanfaatan alat PEM-9004 pada kendaraan bermotor khususnya kendaraan milik siswa di SMA Negeri 1 Maros. Hasil pengujian menunjukkan bahwa kadar emisi gas karbon monoksida (CO) dari kendaraan milik siswa adalah 1,791 %, kadar nitrogen oksida (NOx) dan nitrogen monoksida (NO) adalah masing-masing 7 ppm dan temperatur gas 45°C dengan waktu pengujian 1 menit. Konsentrasi CO masih berada di bawah ambang batas yang ditetapkan oleh pemerintah di dalam Peraturan Menteri Negara Lingkungan Hidup No. 05 Tahun 2006 yaitu konsentrasi gas CO yang diemisikan oleh kendaraan bermotor dengan bahan bakar bensin pada kondisi idle ≤5,5%.

Co-Authors Abdul Karim Abdul Wahid Wahab Abdul Wahid Wahab Andi Muhammad Anshar Astina Tambung Astina Tambung, Astina Emma Suryati Emma Suryati Firdaus . Indah Raya Karuniawati Azis Maming Maming . Miftahul Jannah Muh. Zulkifli Jufri Muh. Zulkifli Jufri, Muh. Zulkifli Muhammad Zakir Musa Ramang Mutmainnah Mutmainnah Nuritasari Azis Nursiah La Nafie Nursiah La Nafie Paulina Taba Syahruddin Kasim Triana Febrianti

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