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Modification of Carbon Nanotube for Synthesis of Titania Nanotube (Tint)-Carbon Nanotube (Cnt) Composite Desi Heltina
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol. 1 No. 1 (2016)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v1i1.4478

Carbon nanotube (CNT) is a material widely chosen for object of research in nano technology. Apart from its good absorbent property, CNT also has a unique structure, superior mechanic and electric properties and its high strength. The property of CNT above is to be expected to improve performance of Titania nanotube (TiNT) composite. Properties of pure CNT are hydrophobic at the surface and low dispersion stability. To improve dispersability of CNT then modification need to be modified. Adding Cetyl trimethyl ammonium bromide (CTAB) surfactant on CNT is a way to increase dispersion stability of TiNT-CNT. The objective of the research was to study influence of adding of Cetyl trimethyl ammonium bromide (CTAB) surfactant to synthesis of TiNT-CNT composite in degrading phenol compound. Pure CNT was added with CTAB surfactant in liquid, then was sonificated and dried. Surfactant Cetyl trimethyl ammonium bromide (CTAB) added CNT then composited with TiNT. Phenol degradation then tested by using TiNT-CNT (CTAB) in reactor for 4.5 hours. Then sample was characterized by employing Field Emission Scanning Electron Microscopy (FESEM), X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR) and UV-vis Spectroscopy. The result of experiments from FESEM characterization showed forming of TiNT-CNT composites morphology. From X–ray Diffraction (XRD) characterization showed crystal formed on TiNT-CNT only of anatase crystal. Degradation of TiNT-NT composite (CTAB) to phenol was also studied.

Pengaruh Konsentrasi Fenol terhadap Efektivitas Fotodegradasi Fenol menggunakan Komposit Titania-Carbon Nanotube (Surfaktan) Desi Heltina; Nadhia Gasani Putri; Panca Setia Utama
Eksergi Vol 17, No 2 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i2.3691

Aromatic compounds in industrial wastewater such as phenols can contribute as pollutants which are highly toxic and carcinogenic. Phenol degradation can be carried out by a photocatalytic process which can convert phenol into non-toxic and enviromentally friendly compounds. The performance of titania (TiO2) photocatalyst was enhanced by using carbon nanotube as a doping agent for titania. To reduce carbon nanotube agglomeration, the surface of carbon nanotube was modified with cocoPAS surfactant. The purpose of this study was to synthesize titania-carbon nanotube-cocoPAS composite and evaluated the effect of initial phenol concentration (10, 20, 30 ppm) on the phenol photodegradation effectivity using titania-carbon nanotube-cocoPAS composite. Titania-carbon nanotube-cocoPAS composite synthesis was carried out by forming a composite between TiO2 and carbon nanotube that had been modified by surfactant. Composite were characterized by SEM, FTIR, and XRD. Phenol photodegradation was carried out at a degradation temperature of 50ºC for 4 hours under UV light. Samples were drawn at regular intervals and residual concentration of phenol in each sample was analysed using UV-Visible spechtrophotometer. The highest degradation effectivity in 4 hours was 81% at initial phenol concentration of 10 ppm.

Biosorpsi Pb (II) Pada Jamur Trichoderma Asperrellum TNJ-63 Desi Heltina; Evelyn; Renny Indriani
Jurnal Rekayasa Proses Vol 3, No 1 (2009)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Logam berat Pb2+ merupakan senyawa yang sangat beracun dan sangat berbahaya bagi makhluk hidup. Salah satu cara untuk menanggulanginya adalah dengan biosorpsi menggunakan jamur. Penelitian ini bertujuan menentukan kapasitas jerap maksimum dan model kesetimbangan biosorpsi Pb2+dengan menggunakan jamur Trichoderma asperellum TNJ-63. Sejumlah jamur Trichoderma asperellum TNJ-63 dimasukkan ke dalam erlenmeyer yang berisi larutan Pb2+ 100 ppm pada suhu ruang dengan massa jamur yang divariasikan. Lama waktu tercapainya kesetimbangan dipelajari dengan memvariasi lama waktu penjerapan dan kecepatan pengadukan. Hasil penelitian menunjukkan bahwa maksimum penjerapan Pb2+ pada jamur Trichoderma asperellum TNJ-63 adalah sebesar 98,24%. Mekanisme proses biosorpsi Pb2+ pada Trichoderma asperellum TNJ-63 mengikuti model isoterm Freundlich. Kata kunci: logam berat, biosorpsi, jamur Trichoderma asperellum, isoterm Freundlich Heavy metal Pb2+ is a highly toxic substance and is very dangerous for living creatures. Biosorption with fungi is one of the abatement methods to reduce the metal contaminant in environment. The present study aimed at determining the maximum biosorption capacity and the equilibrium model of Pb2+ biosorption by Trichoderma asperellum TNJ-63. Some Trichoderma asperellum TNJ-63 varied in amount were put into an erlenmeyer flask containing a solution of Pb2+ with an initial concentration of 100 ppm at room temperature. Variation of stirring speeds (80, 130 and 180 rpm) was also carried out to study its effect on the time required to reach equilibrium. The result showed that Pb2+ could be effectively adsorbed by Trichoderma asperellum TNJ-63 as the biosorbent and its biosorption could reach its maximum by as much as 98.24% (w/w). Calculation result showed that the mechanism of Pb2+ biosorption on Trichoderma asperellum TNJ-63 followed Freundlich isotherm model with an average error of 0.098%. Keywords: heavy metal, biosorption, Trichoderma asperellum, Freundlich isotherm

Pengaruh Konsentrasi H2so4 Terhadap Laju Korosi Dan Efisiensi Menggunakan Ekstrak Daun Salam (Syzgium Polyantha L) Paian Harianja; Komalasari Komalasari; Desi Heltina
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Corrosion cause a material has a limited lifespan,where teh material that was estimated for a long-term use turns out to had a shorter lifespan than its avreange lifespan. One of the prevention of the corrosion was to used corrosion inhibitors that made using organic material was Bay leaf (Syzgium Polyantha L) This research beginss with the manufacture of the bay leaf extract using maceration method for 6 days. The calculation method used in this study was a method of measured weight loss with inhibitor concentrations of bay leaf extract (2 gr/L), variations time were (24, 36, 48 and 60 hours) and corrosion media concentration H2SO4 ( 0.5 and 1 M). The highest inhibition efficiency in the addition of inhibitors 2 gr/L with corrosion media concentration H2SO4 0.5 M of time 60 hour was 70.370% Keywords: aluminium, bay leaf extract, corrosion inhibitor, corrosion rate

Aktivitas Fotodegradasi Fenol Dengan Variasi Suhu Degradasi Menggunakan Komposit Tio2-Cnt(Cocopas) Nadhia Gasani Putri; Desi Heltina; Panca Setia Utama
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Phenols found in the wastewater of some industries have acute toxicity. The photocatalysis process can be used to degrade organic compounds such as phenols. To increase the photocatalytic activity of TiO2, a composite formation was formed between TiO2 and carbon nanotubes (CNT). Before being composited, CNT dispersion was carried out using cocoPAS surfactant as dispersing agent. The purpose of this study is to determine the effect of degradation temperature on phenol degradation. The process of making TiO2-CNT(cocoPAS) composites begins by dispersing CNT with cocoPAS surfactants and then composite with TiO2. Photocatalytic activity of the TiO2-CNT(cocoPAS) composite was tested at an initial phenol concentration of 30 ppm with variation of degradation temperature of 30,40 and 50ºC for 4 hours under UV light. Morphology of TiO2-CNT(cocoPAS) composites were characterized using SEM and phenol concentrations were characterized using a UV-Vis spectrophotometer. The highest degradation of phenols by TiO2-CNT(cocoPAS) composites at the initial phenol concentration of 30 ppm was at the degradation temperature of 50ºC, which was 35.59%.Keywords : photocatalysis, composite, TiO2, CNT, cocoPAS, phenol, temperature

Pengaruh Rasio Solid Liquid Dan Penambahan Graphene Nanosheets Terhadap Kuat Tekan Mortar Geopolimer Berbasis Palm Oil Fuel Ash (POFA) Dan-Flyash Batu Bara Muhammad Zaqi; Amun Amri; Desi Heltina
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Geopolymer mortar is a material that has high SiO2 and Al2O3 content and has the potential to be used as a base for making geopolymer mortar. This study aims to make geopolymerbased mortar (POFA) and coal flyash with the addition of graphene, and variations in the addition of graphene to the mechanical and morphological properties of the geopolymer mortar. The preparation of the geopolymer mortar includes several steps, namely the preparation and mixing of materials with various solid liquid ratios of 72:28, 60:40, and 80:20, then proceed with the preparation of an activator alkaline solution (10 M NaOH + Sodium silicate) and the addition of graphene with variations of 0%, 1% wt, 2% wt, and 3% wt. The results of the morphological analysis showed that the increased cavity that was formed increased along with the increase in the amount of graphene added. While the results of the compressive strength test showed that the highest compressive strength was obtained at 19,2 Mpa at a solid liquid ratio of 60:40 and the lowest compressive strength was obtained at 12,8 Mpa at a solid liquid ratio of 80:20. Keywords : geopolymer mortar, coal fly ash, graphene, POFA

Prarancangan Pabrik Fenol Dan Aseton Dari Cumene Menggunakan Proses KBR Dengan Disain Alat Utama Menara Distilasi Fenol (D-106) Tesa Agustin; Desi Heltina
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The need for phenol and acetone in Indonesia is increasing every year. Based on data from the Central Bureau of Statistics, in the last 5 years, the amount of phenol imports was 20,000 - 26,000 tons/year and the amount of acetone imports was 17,000-22,000 tons/year. Phenol is used as raw material for caprolactam industry, raw material for bisphenol-A whichis used in the manufacture of alkylphenols, phenolic resins, and anilines. While acetone is used as a solvent for waxes, gums, dyes, resins, oils and cellulose. The phenol and acetone factories were designed using the KBR process with cumene as raw material. This plant is planned to operate for 330 days per year and work continuously for 24 hours / day with capacity of 30,000tons / year which will be established in Dumai, Riau. The main tool designed is a phenol distillation tower (D-106) which functions to separate phenol from its mixed compounds. The distillation tower has a height of 10.3548 m and a diameter of 2.286 m with a type of sieve tray distillation and torispherical head with a phenol product purity of 97%. Total Capital Investment for phenol and acetone factories was Rp. 185,258,095,680 with a Fixed Cost value of Rp. 71,474,886,729. The economic analysis of the feasibility of the factory shows that the factory is feasible to build, which can be seen from the analysis of the IRR value obtained of 49.82%, the ROI value of 19.84%, and the pay back period of 4.54 years.Keywords: acetone, cumene, distillation tower, KBR process, phenol

Uji Kinerja Fotokatalis Komposit Tio2-Graphene (Cocopas) Untuk Degradasi Fenol Fadhila Ulfa; Desi Heltina; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Phenol is a chemical compound that is one of the hazardous industrial wastes. An excessive concentration of phenol can cause damage in the environment and human life. Phenol removal can be done by photocatalysis process using photocatalyst materials such as titanium dioxide (TiO2).TiO2 was composited with graphene to increase the photocatalytic activity of TiO2. Graphene was modified with cocoPAS before to disperse graphene when composited with TiO2. TiO2-Graphene (cocoPAS) composite was characterized by SEM. Based on the results of characterization, it can be seen that TiO2 particle loaded on the graphene sheet which indicates that the composites have been successfully made. The performance of the TiO2-Graphene (cocoPAS) composite in phenol degradation was tested in a photocatalysis process for 4 hours. A variable in this photocatalysis process is photocatalysis temperature (40 and 50 oC). the most effective TiO2-Graphene (cocoPAS) composite performance was achieved when the photocatalysis temperature is 50 oC, which can degrade phenol by 97% in 4 hours.Keywords: CocoPAS , degradation, photocatalysis, phenol, graphene, titanium dioxide

Biosorpsi Pb (II) Pada Jamur Trichoderma Asperrellum TNJ-63 Desi Heltina; Evelyn; Renny Indriani
Jurnal Rekayasa Proses Vol 3, No 1 (2009)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.558

Logam berat Pb2+ merupakan senyawa yang sangat beracun dan sangat berbahaya bagi makhluk hidup. Salah satu cara untuk menanggulanginya adalah dengan biosorpsi menggunakan jamur. Penelitian ini bertujuan menentukan kapasitas jerap maksimum dan model kesetimbangan biosorpsi Pb2+dengan menggunakan jamur Trichoderma asperellum TNJ-63. Sejumlah jamur Trichoderma asperellum TNJ-63 dimasukkan ke dalam erlenmeyer yang berisi larutan Pb2+ 100 ppm pada suhu ruang dengan massa jamur yang divariasikan. Lama waktu tercapainya kesetimbangan dipelajari dengan memvariasi lama waktu penjerapan dan kecepatan pengadukan. Hasil penelitian menunjukkan bahwa maksimum penjerapan Pb2+ pada jamur Trichoderma asperellum TNJ-63 adalah sebesar 98,24%. Mekanisme proses biosorpsi Pb2+ pada Trichoderma asperellum TNJ-63 mengikuti model isoterm Freundlich. Kata kunci: logam berat, biosorpsi, jamur Trichoderma asperellum, isoterm Freundlich Heavy metal Pb2+ is a highly toxic substance and is very dangerous for living creatures. Biosorption with fungi is one of the abatement methods to reduce the metal contaminant in environment. The present study aimed at determining the maximum biosorption capacity and the equilibrium model of Pb2+ biosorption by Trichoderma asperellum TNJ-63. Some Trichoderma asperellum TNJ-63 varied in amount were put into an erlenmeyer flask containing a solution of Pb2+ with an initial concentration of 100 ppm at room temperature. Variation of stirring speeds (80, 130 and 180 rpm) was also carried out to study its effect on the time required to reach equilibrium. The result showed that Pb2+ could be effectively adsorbed by Trichoderma asperellum TNJ-63 as the biosorbent and its biosorption could reach its maximum by as much as 98.24% (w/w). Calculation result showed that the mechanism of Pb2+ biosorption on Trichoderma asperellum TNJ-63 followed Freundlich isotherm model with an average error of 0.098%. Keywords: heavy metal, biosorption, Trichoderma asperellum, Freundlich isotherm

Pengenalan cara membuat sabun colek kepada masyarakat Desa Pulau Payung Kecamatan Rumbio Jaya Kabupaten Kampar Desi Heltina; Drastinawati Drastinawati; Chairul Chairul; Mery Sukmiwati
Unri Conference Series: Community Engagement Vol 1 (2019): Seminar Nasional Pemberdayaan Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/unricsce.1.219-222

Kebutuhan masyarakat meliputi sandang, pangan dan papan. Kebutuhan sandang dan pangan tidak terlepas dari proses pembersihan dan pencucian. Salah satu bahan yang digunakan untuk proses pencucian adalah sabun. Sabun colek banyak digunakan untuk kebutuhan rumah tangga karena bentuk sabun yang lembek, tidak basah, tidak kering sehingga mempermudah penggunaannya, yaitu mudah ditakar dan mudah digunakan untuk bagian-bagian yang sulit pada pakaian berkerah dan lipatan lengan. Untuk itu sabun colek menjadi alternatif dalam pemilihan jenis sabun. Jika sabun colek ini dapat dibuat sendiri maka akan dapat menghemat pengeluaran keuangan dan akan menjadi peluang usaha untuk masyarakat dalam upaya meningkatkan kemampuan wirausaha dalam memproduksi sabun sendiri pada skala kecil dan menengah untuk dijual ke Pasaran. Kegiatan pembuatan sabun ini akan dapat menambah pengetahuan masyarakat tentang ilmu dan teknologi serta dapat menambah pengetahuan tentang kewirausahaan. Pengabdian ini direncanakan dilaksanakan pada kelurahan Pulau Payung kecamatan Rumbio Jaya Kabupaten Kampar. Kegiatan dilakukan dengan metode dalam bentuk penyuluhan yaitu mengenalkan cara pembuatan sabun colek dengan metode ceramah, diskusi dan melakukan demonstrasi/praktek pembuatan sabun colek. Kegiatan ini juga mendukung program pemerintah dalam meningkatkan kemampuan masyarakat dalam memproduksi barang kebutuhan sehari hari untuk menghemat pengeluaran masyarakat dan pada akhirnya dapat meningkatkan kesejahteraan masyarakat.

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