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Umar Kalmar Nizar
Universitas Negeri Padang
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Utilization of Cassava Rich in Insoluble Fiber as an Alternative Prebiotic to Increase Family Immunity in Nagari Katapiang, Batang Anai District, Padang Pariaman Regency Melindra Mulia; Umar Kalmar Nizar; Desy Kurniawati; Fauzana Gazali
Pelita Eksakta Vol 4 No 2 (2021): Pelita Eksakta Vol. 4 No. 2
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol4-iss2/157

Abstract

Cassava is widely available, even abundant in the Katapiang Urban Village, Batang Anai Sub-district. Unfortunately, society does not know the benefits of cassava as a prebiotic that is beneficial for family health. This community service activity aims to increase knowledge about prebiotics from cassava and how to process them so that it is beneficial to society. In this way, the health of the family can be maintained. The activity was carried out at the Masjid Istiqomah, Katapiang Urban Village, Batang Anai Sub-district, Padang Pariaman District, involving 18 targets. The activities implementation is divided into two stages, namely guided and independent activities. In the guided activities, interactive counseling and practical methods are used. Meanwhile, in independent activities, the targets made spice drinks in groups. The results of the activity showed targets’ knowledge about prebiotics and how to process cassava had increased so that they can get optimal benefits for health. The target is also interested in producing and consuming, their own processed cassava that has been made.
Pengaruh Pengadukan pada Degradasi Asam Humat Menggunakan Reaktor Mobile Heksagonal Fauzan Yan Hawari; Rahadian Zainul; Syamsi Aini; Umar Kalmar Nizar
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 2 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1376.567 KB) | DOI: 10.24036/p.v11i2.113590

Abstract

Humic acid is a heterogeneous organic compound that is toxic, mutagenic and carcinogenic. This study goals to degrade humic acid using the photocatalytic method. The photocatalyst used for degradation is nano ZnO doped Cu 7%. The degradation process applies sunlight using a hexagonal mobile reactor and the light intensity is measured using a lightmeter. The degradation was carried out with variation of stirring at 500 rpm and without stirring at 1, 2, 3, 4 and 5 hours of irradiation. Result of degradation analysed using UV-Vis spectrophotometer. Result obtained the degradation using stirring has a higher percentage of degradation than without stirring. The percentage maximum of degradation obtained in study was 90,09% with 500 rpm stirring at 5 hours irradiation. In this study showed the effect of stirring on humic acid degradation using a hexagonal mobile reactor. 
Studi Pengaruh Faktor Suhu, Waktu, Massa Katalis dan Perbandingan Mol Dalam Produksi Biodiesel Dari PFAD Menggunakan Katalis Karbon Tersulfonasi Naka Yura; Umar Kalmar Nizar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 1 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (153.6 KB) | DOI: 10.24036/p.v9i1.108859

Abstract

Depletion and environmental problems caused by the use of fossil fuels, the need for alternatives to balance the availability of nature. Biodiesel synthesis has become a concern lately for renewable and sustainable fuels. In this work, biodiesel is synthesized from 5 different acid catalysts with the use of the same raw material, PFAD. Catalysts used for biodiesel synthesis are acid catalysts from glucose derivatives (D-glucose) acid catalysts from starches, acid catalysts from empty fruit bunches, acid catalysts from oil palm and bamboo branches, and acidic catalysts from glucose modified with oscillation flow. Acid catalyst from glucose derivative (D-Glucose) obtained conversion of FFA and FAME respectively 95.4% and 92.3% with the optimum reaction conditions was 2.5% of the catalyst mass, 10: 1 mole ratio of PFAD methanol, reaction temperature 75 C and reaction time for 2 hours. Acid catalyst from starch obtained conversion of FFA and FAME respectively were 94.6% and 90.4% with the optimum reaction conditions ie 2% mass of catalyst, 10: 1 mole ratio of PFAD methanol, reaction temperature of 75C and reaction time of 2 hours. Acid catalyst from empty fruit bunches obtained 98% FFA conversion with optimum conditions of 4% catalyst mass, 16: 1 mole ratio of PFAD methanol, reaction temperature of 100 C, time of 3 hours. Acid catalysts from oil palm and bamboo shells have FFA conversion and different FAME values, namely 97% and 95% for CKS, while 95.8% and 94.2% for bamboo with the same optimum conditions at 4% catalyst mass, 15: 1 comparison mole of methanol, temperature 65 C, reaction time 1 hour. And acid catalyst from glucose modified by oscillation flow gets FFA and FAME conversion of 97% and 94.21% with optimum reaction conditions, 2.5% of catalyst mass, 9: 1 mole ratio of methanol, temperature of 60C and reaction time for 50 minute.
Katalis Asam Padat Berbasis Karbon Tersulfonasi Pada Proses Pembuatan Biodiesel Muhammad Hiknul Ikhsan; Umar Kalmar Nizar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 1 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1191.32 KB) | DOI: 10.24036/p.v9i1.108945

Abstract

Biodiesel is a promising alternative energy source in the future. The method of making biodiesel is the reaction of fatty acid esterification with methanol assisted by a catalyst. The catalyst that is widely developed in the process of making biodiesel is solid acid catalyst. Especially those based on sulfonated carbon. The purpose of this article is to explain the function and role of sulfonated carbon-based solid acid catalyst in the biodiesel production process. Solid acid catalyst is synthesized by sulfonation process of calcined carbon using sulfuric acid or chlorosulphonic acid. The advantage of using a solid acid catalyst is that the catalyst can be regenerated so that it can be used in several cycles. The use of solid acid catalysts can produce biodiesel with a fairly high conversion percentage. Keywords— biodiesel, solid acid catalyst, sulfonation, sulfuric acid, chlorosulfonic acid
Pengaruh Penambahan Cetyltrimethylammonium Bromide (CTAB) pada Silika dari Natrium Silikat (Na2SiO3) Habibur Rahman Dafnaz; Budhi Oktavia; Hardeli Hardeli; Umar Kalmar Nizar
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 1 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v11i1.113765

Abstract

Silica is a useful material in adsorption, electronics, mechanical, medical, art to other fields. In this study, Sodium silicate is used which can be used as a more economical precursor of silica as which is produced from natural silica. Silica was synthesized using the sol-gel method. This study aims to determine the effect of adding CTAB mass and  aging time in synthesizing silica. The synthesized silica was tested for iodine absorption value and characterized using FTIR. Based on the iodine absorption of variations in adding mass CTAB (0,1, 0,15, 0,2, 0,25, and 0,3 gram) and aging time (8, 12, 16, 20 and 24 hours) give the most absorption to optimum conditions of adding mass CTAB at 0,2 gram and aging time at 16 hours. The results of measurements with FTIR showed the presence of absorption bands which indicated the loss of CTAB in the synthesized silica.
Pengaruh Penambahan Gum Arab Terhadap Pembuatan Plastik Biodegradable dari Air Kelapa Norma Wahyunita; Ananda Putra; Umar Kalmar Nizar; Fajriah Azra
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 3 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v11i3.116214

Abstract

Plastic is a polymer that we use a lot in everyday life, but it has a bad impact on the environment because it is difficult to degrade in nature. Therefore, a study was carried out to make plastic that is more environmentally friendly, namelyplastic Biodegradable that utilizes bacterial cellulose from Acetobacter xylinum with old coconut water as a medium with the addition of a plasticizer in the form of Polyethylene Glycol (PEG) and the addition of gum arabic additives with variations in the mass of gum arabic, namely 0g , 1g, 3g, 5g and 7g. The bacterial cellulose plastic PEG gum arabic produced was characterized includingwater content, degree ofswelling,testtensile strength, elongation, elasticity, ability biodegradation, functional group analysis (FTIR) and crystallinity test (XRD). The results of testing the water content and degree of swelling on PEG gum arabic bacterial cellulose plastic, obtained plastic with the more mass of gum arabic added, the greater the percentage of water content and degree of swelling. The results of mechanical testing showed an increase in the value of tensile strength and elasticity along with the amount of gum arabic added but the elongation value decreased. In the biodegradation test, it was found that the more gum arabic which was added, the biodegradation ability increased. The analysis of the plastic functional groups showed that there were no new groups formed. Crystallinity analysis showed that the addition of gum arabic can reduce the percentage of crystallinity.
Dedradasi Metilen Biru Secara Fotolisis Dengan Katalis Cdots Doping Au Septian Budiman; Hary Sanjaya; Isnaeni Isnaeni; Umar Kalmar Nizar; Edi Nasra
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 3 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v11i3.115918

Abstract

The degradation of methylene blue was carried out by photolysis method with the help of a Cdots/Au catalyst. This study aims to determine the optimum concentration of dopen Au for Cdots and the optimum time for degradation of methylene blue with the help of a Cdots/Au catalyst. The photolysis method was carried out in a reactor equipped with 3 15 watt lamps with a UV wavelength of 254 nm. The absorption of methylene blue was measured using a spectrophotometer UV-Vis. The optimum Au dopen results were obtained at a concentration of 25 ppm with a degradation percentage of 39.94% and the optimum time for photolysis degradation was 6 hours of irradiation with a degradation percentage of 70.28%.
Optimasi Adsorpsi Ion Logam Cu2+ dengan Menggunakan Cangkang Telur Ayam Ras Nesya Febi Utami; Edi Nasra; Desy Kurniawati; Umar Kalmar Nizar
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 3 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v11i3.115915

Abstract

adsorption is a method of waste treatment that has the potential to remove toxic heavy metals. One of the factors that influence the occurrence of the adsorption process is the presence of a biological material called a biosorbent. The adsorption method is a method of absorbing heavy metal contamination in liquid waste that is very efficient and effective, as well as easy and cheap economically because of the use of biomaterials that are very cheap and can be regenerated. Chicken egg shell contains Calcium Carbonate (CaCO3) of 98.41% and has natural pores of 10,000 to 20,000 so it is estimated that it can absorb solutes. Based on the known mineral composition, chicken egg shells are composed of CaCO3 (98.41%), Ca3(PO4)2 (0.75%), and MgCO3 (0.84%). So it can be seen that chicken egg shells have a high calcium carbonate content, where calcium carbonate is a polar adsorbent. The optimum conditions for each variable in contacting broiler egg shells that have been activated with Cu2+ metal ions are optimum at pH 4, concentration of 250 ppm.
Silika Gel Termodifikasi Dimetilamin Sebagai Penyerap Anion Fosfat Delfitri Delfitri; Budhi Oktavia; Desy Kurniawati; Umar Kalmar Nizar
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 3 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v11i3.116103

Abstract

Silica gel is one type of dry silica gel which is widely used as an adsorbent. Silica has the ability to absorb because it has two active site groups that can be activated, namely a silanol group and a siloxane group. This modification was carried out to increase the ability of silica to absorb ions, one of which was phosphate anion. In waters, very high levels of phosphate anion can disrupt the marine biota ecosystem because it can cause uetrophication or decreased oxygen levels that enter the waters. The modifier compound used is dimethylamine (DMA). Silica and dimethylamine can bind to several linking compounds, namely glycidopropyltrimethoxylan (gptms). The modified silica was characterized by FTIR and the absorption results were analyzed using a UV-Vis spectrophotometer. The results of the comparison of the absorption capacity of phosphate anions after modification are greater than before modification, where the absorption capacity of silica before modification is 1,2601 mg/g with an absorption percentage of 54,46% and silica after modification is 1.9686 mg/g with an absorption percentage of 1,9686 mg/g. 85,08%.Keywords — Silica gel, Modification, Dimetilamine, Phosphate Anion
Potensi Pemanfaatan Sabut Pinang (Arecha cathecu L.) Kecamatan Lengayang sebagai Sumber Karbon untuk Bahan Baku Material Maju Nadia Nadia; Umar Kalmar Nizar
Jurnal Periodic Jurusan Kimia UNP Vol 12, No 1 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v12i1.117077

Abstract

Carbon material is one example of the development of advanced materials. Carbon is the result of the decomposition of an organic compound through an incomplete carbonization process. Carbon can be utilized from organic waste materials such as areca fiber. The composition of areca nut is 32.98% hemicellulose, 7.20% lignin, 53.20% cellulose, and 4.81% other components remaining in areca nut. Cellulose in betel nut can be used as a source of advanced materials. The method used for the manufacture of areca fiber carbon is calcination at a temperature variation of 250oC, 300oC and 350oC. Proximate analysis of carbon was carried out by testing the ash content, vapor content and bound carbon content. In this research, the standard used is SNI 06-3730-1995. The results of the analysis show that the ash content increases with the increase in the calcination temperature, while the vapor content decreases with the increase in the calcination temperature. The carbon content obtained decreases with increasing calcination temperature. The optimum condition of areca fiber carbon that is close to SNI 06-3730-1995 is obtained on carbon with a calcination temperature of 250oC, with an ash content of 8.85%, a vapor content of 3.12% and a bound carbon content of 88.03%.
Co-Authors Ahmad Maulana Ardi Amalia Putri Lubis Ananda Putra Aroma Karmila Budhi Oktavia Delfitri Delfitri Desy Kurniawati Edi Nasra Ellizar ellizar Fajriah Azra Fauzan Yan Hawari Fauzana Gazali Fazhira Hanifah Geita Yulyan Firel Habibur Rahman Dafnaz Hardeli Hardeli Hardeli Hary Sanjaya Indang Dewata Isnaeni Isnaeni Maifil Dwi Andrean Mawardi Mawardi Muhammad Hiknul Ikhsan Mulia, Melindra Nadia Nadia Naka Yura Nesya Febi Utami Niza Lian Pernadi Norma Wahyunita Oktavia Wulandari Rahadian Zainul Rida Rida Rini Anggraini Risya Yelfika Rita Sundari Safira Wulandari Septian Budiman Silvi Handri Sri Benti Etika Sri Teguh Priharti Suryelita . Syamsi Aini Syilla Nurvidayah Trisna Kumala Sari Vionisa Vionisa Wini Andriani