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All Journal IPTEK The Journal for Technology and Science KOVALEN: Jurnal Riset Kimia Jurnal Kimia Riset Chimica et Natura Acta Indonesian Journal of Chemistry FLUIDA
Haryadi, Haryadi
Jurusan Teknik Kimia, Politeknik Negeri Bandung
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Energy Engineering Environmental Science Materials Science & Nanotechnology

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Structural and Transport Properties of Hybrid Organic Inorganic Silica Membranes Haryadi, Haryadi
IPTEK The Journal for Technology and Science Vol 18, No 2 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i2.171

Abstract

The series of hybrid organic-inorganic silica materials have been prepared by introducing organic ligands materials based on sol-gel processing of alkoxysilanes for potential applications in membrane design for pervaporation. The materials were characterized using structural and dynamic techniques to gain information about the formation of micro- and mesoporous silicates. The dynamic interaction within silica matrices were investigated using FTIR, Raman Spectroscopy, Solid State NMR Spectroscopy, Physisorption and SEM. The transport properties of the hybrid materials were observed by monitoring the diffusion behavior of water and several selected solvents using Pulsed Field Gradient NMR. The self-diffusion of water and organic solvents in the hybrid silica materials were two to three orders of magnitude smaller than in the liquid bulk suggesting restricted diffusion at the pore surface. The effect of surface polarity also contributed to water and solvents diffusivities. The temperature dependence of diffusion was useful to derive the activation energy whereas the dependence on NMR observation time provided information on both tortuosity and pore connectivity of the hybrid silica materials. These materials have potential uses in gas and liquid separation such as pervaporation.
Sintesis dan Karakterisasi Serat Nano Polivinil Alkohol yang Diikat Silang dengan Glutaraldehid untuk Aplikasi Pembalut Luka Mentik Hulupi; Haryadi Haryadi
Chimica et Natura Acta Vol 6, No 3 (2018)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (307.051 KB) | DOI: 10.24198/cna.v6.n3.18477

Abstract

Elektrospining serat nano (nanofiber) PVA yang diikat silang oleh glutaraldehyde (GA) telah berhasil disintesa dan dikarakterisasi. Sintesis serat nano PVA dilakukan dengan menginjeksikan larutan PVA 10% kedalam mesin electrospinning selama 6 jam pada suhu 28.7oC dengan laju injeksi 1.0 ml/jam, menggunakan potensial listrik sebesar 14.6 kV serta jarak untuk mengkoleksi serat sejauh 10 cm.  Metoda ikat silang dilakukan secara in-situ terhadap serat nano PVA menggunakan glutaraldehyde 0.5M didalam pelarut aseton, selama 4 jam. Dari hasil – hasil karakterisasi serat nano PVA menggunakan FTIR menunjukkan adanya pergeseran puncak serapan untuk jenis vibrasi tarik dari gugus fungsi O-H, C-H dan C-O dari sebelum dan setelah dilakukan proses ikat silang menggunakan glutaraldehyde (GA). Hasil dari pengukuran menggunakan FTIR tersebut didukung dengan hasil karakterisasi morfologi  seratnano PVA menggunakan SEM setelah proses ikat silang yang menunjukkan adanya sedikit peningkatan dari besar atau tebalnya diameter serat nano sebesar 250 nm dibandingan dengan serat nano PVA tanpa dilakukan tahap ikat silang. Dari hasil ini dapat  disimpulkan bahwa proses ikat silang menggunakan GA mempengaruhi terhadap struktur kimia serta morfologi serat nano PVA. Dapat ditambahkan pula bahwa spektrum EDS juga menunjukkan pengaruh adanya glutaraldehyde sebagai zat pengikat silang yang mampu mereduksi  besarnya intensitas dari energi dispersive serat nano PVA.
C Dots Derived from Waste of Biomass and Their Photocatalytic Activities Haryadi Haryadi; Muhammad Ridwhan Wira Purnama; Ari Wibowo
Indonesian Journal of Chemistry Vol 18, No 4 (2018)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (426.55 KB) | DOI: 10.22146/ijc.26652

Abstract

Carbon nanodots (CNDs) which are part family of carbon nanoparticles have drawn a lot of attention due to their prominent characters and wide prospective applications. The materials are non-toxic and exhibit fluorescence properties that are potential for application in photocatalysis, optoelectronic, bioimaging and sensors. Various approaches of CNDs synthesis have been investigated by means of a large variety of starting materials and techniques. A green and an effective approach in gaining CNDs from wastes biomass-carbonaceous particles of a dried solid waste of cow manure have been employed by hydrothermal treatment. The CNDs were then attained after carbonaceous particles dissolution step under microwave irradiation. The temperature range of hydrothermal treatment was in between 250 to 300 °C. The formation of C=C, C-O bonds, and conjugated structures has been observed by FTIR and photoluminescence properties have been identified under 366 nm of UV irradiation. Furthermore, the morphology of as-synthesized CNDs was investigated by HR-TEM and crystallinity was observed by X-Ray Diffraction (XRD). Photocatalytic degradation of synthetic dye solution of methylene blue (MB) in the presence of carbon dots has been investigated under visible light.
Ekstraksi dan Karakterisasi Serat Selulosa dari Tanaman Eceng Gondok (Eichornia Crassipes) Endang Kusumawati; Haryadi
Fluida Vol 14 No 1 (2021): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v14i1.3452

Abstract

Eceng gondok merupakan gulma air yang tumbuh pesat di perairan. Pada penelitian ini dilakukan proses ekstraksi dan karakteristik serat selulosa dari eceng gondok. Tujuan dari penelitian ini adalah mendapatkan jenis pelarut yang efektif untuk mengekstrak serat selulosa dari tanaman eceng gondok sehingga didapat konversi serat yang optimum.Kandungan batang eceng gondok yang kaya akan selulosa, hemiselulosa dan lignin berpotensi untuk dijadikan bahan dasar pembuatan carbon nanodots (C-Dots) dan kepentingan lainnya. Untuk dijadikan bahan baku C-Dots harus dilakukan pemisahan hemiselulosa dan lignin-nya karena akan berpengaruh pada proses karbonisasi, sehingga perlu dilakukan pretreatment untuk mendapatkan serat selulosa murni. Proses ekstraksi merupakan salah satu cara untuk mendapatkan serat selulosa murni.Proses ekstraksi dilakukan melalui dua tahap proses yaitu proses delignifikasi menggunakan NaOH 4% dan tahap bleaching dengan memvariasikan beberapa jenis pelarut dengan konsentrasi yang seragam, dalam penelitian ini digunakan NaClO2, H2O2 dan HCl masing-masing 3%. Selulosa yang diperoleh dikarakteristik menggunakan FTIR dan HPLC sehingga diperoleh gugus fungsi dan jumlah lignin yang terdapat dalam residu.Pelarut terbaik ditinjau dari berat selulosa yang dihasilkan dan analisis FTIR dan HPLC adalah NaOH 4% NaClO2 3%.Berat selulosa yang dihasilkan lebih banyak dari kedua variasi pelarut lainnya.Analisis FTIR tidak mendeteksi adanya gugus fungsi senyawa lignin pada selulosa.Analisis HPLC diperoleh selulosa lebih murni dari kedua variasi yaitu sebesar 77,6%. Hal ini menunjukkan bahwa produk selulosa yang dihasilkan dari proses ekstraksi dengan pelarut tersebut efektif serta memiliki kemurnian yang tinggi.
PURIFICATION OF ETHANOL BY CONTINUOUS ADSORPTION METHOD USING ZEOLITE 3A AND CALCIUM OXIDE Mukhtar Anas Ibrahim; Muhammad Hafizh Musyaffa; Heriyanto; Haryadi
Jurnal Kimia Riset Vol. 7 No. 1 (2022): June
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v7i1.35682

Abstract

The depletion of oil reserves and the increasing need for fuel have become a problem in the supply of energy sources. One of the efforts to maintain the availability of fuel is to use ethanol fuel grade as an alternative fuel. Continuous adsorption is one method that can purify ethanol up to a concentration of 99.5% (v/v). This study aims to increase the purity of ethanol using adsorbent zeolite 3A and calcium oxide (CaO) with a continuous adsorption method. The feed used is technical ethanol with a concentration of 96% (v/v). The equipment used is a continuous adsorption apparatus with a fixed bed column. Parameters measured during the process were ethanol concentration, feed flow rate, temperature, and pressure. Variations carried out were variations in feed flow rate (5 mL/min, 12 mL/min, and 18 mL/min) and the type of adsorbent (zeolite 3A and CaO). The best continuous adsorption process at 5 mL/min flow rate using zeolite 3A adsorbent with the ethanol product concentration rated up to 99.54% on pycnometer analysis and 99.33% on GC-MS analysis. While using CaO adsorbent, the best results were obtained at 5 ml/min rate, with the highest ethanol product concentration of 99.54% in the pycnometer and 99.33% on GC-MS.
Sintesis dan Karakterisasi Carbon Nanodots dengan Metode Microwave Assisted Extraction: Synthesis and Characterization of Carbon Nanodots with Microwave Assisted Extraction Mentik Hulupi; Haryadi; Nabila Sofiyani; Rizka Amalia Nuriana; Retno Indarti; Fauzi Abdilah
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 2 (2022): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i2.15910

Abstract

Carbon nanodots (CNDs) is one of the carbon nanoparticles that are environmentally friendly, non-toxic, and have optical properties. The aim of this study was to synthesize CNDs from ascorbic acid as a precursor using the Microwave Assisted Extraction method. method. Best results are obtained at 4 minutes of heating and 500W of power. The synthesized CNDs solution showed a blue color under 365 nm UV light. The measurement results with UV Vis spectrophotometer showed the maximum wavelength at 341.5 nm with an energy gap of 5.57 eV. The results of the Fourier transform infrared spectroscopy (FTIR) analysis show that CNDs have the -OH (hydroxyl) functional group at a wave number of 3354.61 cm-1 and C=O functional group at a wave number of 1633.09 cm-1. Characterization results using High resolution transmission electron microscopy (HRTEM) showed that CNDs were spherical in shape with a particle size range of 2.54-9.48 nm.
Co-Authors Ari Wibowo Ayu Utami Endang Kusumawati Fauzi Abdilah Heriyanto Mentik Hulupi Muhammad Hafizh Musyaffa Muhammad Ridwhan Wira Purnama Mukhtar Anas Ibrahim Nabila Sofiyani Retno Indarti Riniati Rizka Amalia Nuriana Sofiatun Anisa