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All Journal Reaktor Jurnal Teknik ITS Jurnal Sains dan Seni ITS JURNAL TEKNOLOGI LINGKUNGAN IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Journal of Engineering and Technological Sciences Jurnal Zeolit Indonesia JST ( Jurnal Sains Terapan ) Indonesian Journal of Chemistry Akta Kimia Indonesia Specta Journal of Technology PIKAT Sewagati

Nurul - Widiastuti

Institut Teknologi Sepuluh Nopember

Author-ID : 2781021

Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Public Health Social Sciences Other

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PVDF/TiO2/PEG Hollow Fiber Membrane for Oily Wastewater Treatment at Various Concentration of Oily Wastewater Fithri Yatul Humairo; Chi Siang Ong; Nurul Widiastuti; Ahmad Fauzi Ismail; Shabrina Adani Putri; Juhana Jafar
IPTEK Journal of Proceedings Series No 1 (2015): 1st International Seminar on Science and Technology (ISST) 2015
Publisher : Institut Teknologi Sepuluh Nopember

The purpose of this research is to enhance the performance of PVDF/TiO2 membrane particularly permeate flux in the application of oily wastewater treatment by adding Polyethylene glycol (PEG). Various concentration of oily wastewater was conducted in order to investigate the influence of the concentration on the membrane performance. Results show that by adding the PEG into the PVDF/TiO2 membrane, the permeate flux of oily wastewater was increase compared to PVDF/TiO2 membrane without PEG. The permeate flux was affected by concentration of synthetic oily wastewater. Increasing the concentration of synthetic oily wastewater, decreasing the flux of oily wastewater

Synthesis N-Doped Activated Carbon from Sugarcane Bagasse for CO2 Adsorption Randy Yusuf Kurniawan; Irsandi Dwi Oka Kurniawan; Lukman Atmaja; Nurul Widiastuti
IPTEK The Journal for Technology and Science Vol 30, No 3 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v30i3.5469

Nitrogen-doped activated carbon (SBACN) was synthesized from sugarcane bagasse waste as acarbon source and urea as nitrogen source through potassium hydroxide (KOH) activation for 2 h at high temperature via two step methods. The synthesized SBCN was characterized using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Fourier Transform Infrared (FTIR). The results showed that the SBCN has low degree crystallinity and graphitization with highly developed micropores due to synergistik activation effect of KOH and urea. These characteristics provide an important contribution to carbon dioxide adsorption capacity, which can reach up to 11,20% wt and this value is higher than pristine activated carbon. The results indicating that the presence of this nitrogen functionalities is found to have a beneficial influence on the carbon dioxide adsorption characteristic in standart condition and exhibit considerable potential in solid adsorption.

Preparasi dan Karakterisasi Membran Gabungan PSf/PEG dengan Variasi Pengisi KTZ dan KTZ Teroksidasi untuk Aplikasi pada Larutan Kristal Violet Nurul Widiastuti; M. Faqri Fahrozi Huzein; Taufik Qodar Romadiansyah
Akta Kimia Indonesia Vol 6, No 2 (2021)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25493736.v6i2.11456

Membran gabungan PSf dengan aditif PEG-400 dan variasi pengisi KTZ dan KTZ teroksidasi telah dipreparasi melalui metode inversi fasa dengan DMAc sebagai pelarut. Membran dikarakterisasi dengan X Ray Difraction (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Thermogravimetric Analysis (TGA), Forier Transform Infrared (FTIR) dan contact angle meter. Membran diuji kinerjanya dengan filtrasi kristal violet. Nilai fluks air untuk membran PSf/PEG, PSf/PEG-KTZ dan PSf/PEG-KTZ teroksidasi masing-masing adalah 101,91 L/m2jam, 320,05 L/m2jam dan 60,64 L/m2jam. Nilai rejeksi terhadap kristal violet untuk masing-masing membran adalah 98,17%, 82,90% dan 99,4% .

Synthesis of Zeolite-X Supported On Glasswool for CO2 Capture Material: Variation of Immersion Time and NaOH Concentration at Glasswool Activation Anggita R.K. Wardani; Nurul Widiastuti
Indonesian Journal of Chemistry Vol 16, No 1 (2016)
Publisher : Universitas Gadjah Mada

Zeolite X supported on fiber material (glasswool) was successfully synthesized using a simple hydrothermal method. Variation of immersion time and NaOH concentration were used for glasswool activation. Activation process of glasswool has effects toward crystallinity and growth of zeolite X on glasswool surface. The results of characterization using XRD, SEM and AFM showed that zeolite X crystal grew on glasswool surface with high crystallinity using NaOH concentration 4M for 24 h. BET surface area and pore characteristics were analyzed by N2 isothermal adsorption. Carbon dioxide adsorption measurement using gravimetric method showed that zeolite X supported on glasswool has capability to capture carbon dioxide at room temperature up to 2.83 weight %.

Crystal Phase and Surface Morphology of Zeolite-Y Templated Carbon with K2CO3 and ZnCl2 Activation Ufafa Anggarini; Eva Agustina; Nurul Widiastuti
Indonesian Journal of Chemistry Vol 15, No 3 (2015)
Publisher : Universitas Gadjah Mada

Zeolite-Y templated carbon (ZTC) has been activated with K2CO3 and ZnCl2. This research aims to compare the characteristics of ZTC with K2CO3 and ZnCl2 activation. ZTC was synthesized via impregnation method followed by carbonization. In this research, activation process was conducted at variation of activator/carbon weight ratio of 1 and 1.50. The activation was carried out by heating up impregnated carbon at 800 °C for 1 h followed by washing to remove inorganic salt. XRD and SEM results indicate that the use of different activator produce ZTC with varied structure and morphology. Diffractogram results showed that the graphitic peak decreased due to K2CO3 activation, whereas graphitic peak increased owing to ZnCl2 activation. Decreasing the graphitic peak indicates that ZTCs have higher pore structure formation. In addition, surface formation of ZTC activated by K2CO3 was higher than by ZnCl2 activation. The higher pore structure formation means the amount of carbon deposited on external surface material was decreased.

Impregnation Nickel on Mesoporous ZSM-5 Templated Carbons as a Candidate Material for Hydrogen Storage Ratna Ediati; Amirul Mukminin; Nurul Widiastuti
Indonesian Journal of Chemistry Vol 17, No 1 (2017)
Publisher : Universitas Gadjah Mada

A series of carbon with ZSM-5 mesoporous (ZMC) and Ni/ZMC ZSM-5 templates were synthesized and gravimetrically known its adsorption capacity to H2 gases. ZMC carbon was synthesized using a hard template method at a carbonation temperature of 900 oC with sucrose as a source of carbon. A mesoporous ZSM-5 template was synthesized by using a hydrothermal method at an aging and crystallization temperature of respectively 60oC and 150oC for as long as 24 hours. The characterized result of ZMC carbon using XRD powder has shown a diffracted pattern of amorphous carbon. Impregnating Ni with ZMC carbon each resulted in 5%, 15% and 25% of weight, which in turn also resulted in a diffractogram pattern of Ni/ZMC-5, Ni/ZMC-15, and Ni/ZMC-25, where each patterns were uniform and had no additional peaks. The results of SEM-EDAX showed that Ni had been successfully impregnated on the surface of ZMC carbon with a random morphology surface of ZMC carbon. The isothermal results of adsorption – desorption of N2 showed that the larger the Ni loading on the supporting ZMC carbon, the smaller the surface area of the ZMC specific carbon. The distribution of the pore size that was counted by using the BJH method, which was applied to all the samples, was as big as 3,8 nm. The adsorption capacity of H2 was measured by using the gravimetry method at ambient temperature for Ni/ZMC-5, Ni/ZMC-15, and Ni/ZMC-25, which each gave a weight percentage of 0,331%; 0,663% and 0,649% respectively, whilst the ZMC carbon has a weight of 2,18%.

The Modification of PVDF Membrane via Crosslinking with Chitosan and Glutaraldehyde as the Crosslinking Agent Romaya Sitha Silitonga; Nurul Widiastuti; Juhana Jaafar; Ahmad Fauzi Ismail; Muhammad Nidzhom Zainol Abidin; Ihsan Wan Azelee; Mahesan Naidu
Indonesian Journal of Chemistry Vol 18, No 1 (2018)
Publisher : Universitas Gadjah Mada

Poly(vinylidene fluoride) (PVDF) has outstanding properties such as high thermal stability, resistance to acid solvents and good mechanical strength. Due to its properties, PVDF is widely used as a membrane matrix. However, PVDF membrane is hydrophobic properties, so as for specific applications, the surface of membrane needs to be modified to become hydrophilic. This research aims to modify PVDF membrane surface with chitosan and glutaraldehyde as a crosslinker agent. The FTIR spectra showed that the modified membrane has a peak at 1655 cm-1, indicating the imine group (–N=C)- that was formed due to the crosslink between amine group from chitosan and aldehyde group from glutaraldehyde. Results showed that the contact angle of the modified membrane decreases to 77.22° indicated that the membrane hydrophilic properties (< 90°) were enhanced. Prior to the modification, the contact angle of the PVDF membrane was 90.24°, which shows hydrophobic properties (> 90°). The results of porosity, Ɛ (%) for unmodified PVDF membrane was 55.39%, while the modified PVDF membrane has a porosity of 81.99%. Similarly, by modifying the PVDF membrane, pure water flux increased from 0.9867 L/m2h to 1.1253 L/m2h. The enhancement of porosity and pure water flux for the modified PVDF membrane was due to the improved surface hydrophilicity of PVDF membrane.

Synthesis of Zeolite-X Supported on Kapok Fiber for CO2 Capture Material: Variation of Immersion Time during Fiber Activation Mada Mariana Lakapu; Nurul Widiastuti
Indonesian Journal of Chemistry Vol 17, No 3 (2017)
Publisher : Universitas Gadjah Mada

Zeolite-X is a potential material for CO2 adsorption. To increase the performance of zeolite-X, kapok fiber was used as a support material. The growth of zeolite-X on the surface of kapok was affected by activation of the surface. This research aims to optimize the immersion time of kapok fiber using NaOH in order to achieve high crystallinity of the zeolite-X. The Zeolite-X supported on kapok fiber was synthesized by the simple hydrothermal method at immersion time variation of 12 to 36 h. XRD results show that zeolite-X on kapok surface has the highest crystallinity at immersion time of 24 h. The topography of kapok surface from AFM indicates that the surface was damaged due to peeling reaction of NaOH. SEM results show that zeolite-X has grown on the kapok surface in considerable amounts. From TGA analysis, it was shown that the thermal stability of zeolite-X supported on kapok surface was up to 300 °C. Adsorption of CO2 measured by gravimetric method shows that CO2 adsorption capacitywas up to 15.097 wt.% at room temperature.

P84/Zeolite-Carbon Composite Mixed Matrix Membrane for CO2/CH4 Separation Triyanda Gunawan; Retno Puji Rahayu; Rika Wijiyanti; Wan Norharyati Wan Salleh; Nurul Widiastuti
Indonesian Journal of Chemistry Vol 19, No 3 (2019)
Publisher : Universitas Gadjah Mada

Mixed Matrix Membranes (MMMs) which consist of 0.3 wt.% Zeolite-Carbon Composite (ZCC) dispersed in BTDA-TDI/MDI (P84 co-polyimide) have been prepared through phase inversion method by using N-methyl-2-pyrrolidone (NMP) as a solvent. Membranes were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Thermogravimetric Analysis (TGA), and Fourier Transform Infrared (FTIR). Membrane performance was measured by a single gas permeation of CO2 and CH4. The maximum permeability of CO2 and CH4, which up to 12.67 and 6.03 Barrer, respectively. P84/ZCC mixed matrix membrane also showed a great enhancement in ideal selectivity of CO2/CH4 2.10 compared to the pure P84 co-polyimide membrane.

Combined Computational and Experimental Study the Effect of Doped Magnesium into Betanine-sensitized TiO2 Photoanode for Dye-Sensitized Solar Cells Application Yuly Kusumawati; Nanik Ismi Oktavianti; Linda Wati Oktavia; Nurul Widiastuti; Lukman Atmaja; Nur Izzati Abu Bakar; Nur Hadi
Indonesian Journal of Chemistry Vol 19, No 4 (2019)
Publisher : Universitas Gadjah Mada

A preliminary study of the effect of magnesium-doped into betanine-sensitized TiO2 thin layers has been carried out computationally and experimentally. The computational calculation was performed to observe the effect of magnesium on the interaction molecular of betanine onto TiO2 surface, using Ti12O28H8 model cluster. It was found out that the distance of the oxygen on the anchoring site betanine with the Ti in TiO2/Mg cluster is shortercompare to that one in TiO2 cluster. This result confirms the bond between betanine and TiO2 is stronger in the case of Mg2+ incorporation. The Natural Population Calculation also confirms that the electron transport from betanine to the TiO2 is more facilitated after Mg2+ incorporation. These results are also supported by the HOMO-LUMO profile of TiO2-betanine and TiO2/Mg. The XRD and SEM measurement confirm those are no effect on the TiO2 structure and morphology with the incorporation of Mg2+. The thin-film UV-Vis measurement confirms there is a bandgap sift after the incorporation of Mg.

Co-Authors Abdul Halim Adi Setyo Purnomo Ahmad Fauzi Ismail Ahmad Fauzi Ismail Ahmad Fauzi Ismail Ahnaf Ahnaf Alvin Romadhoni Putra Hidayat Amirul Mukminin Anggita R.K. Wardani Ariyanti, Dhita Audi Sabrina Chi Siang Ong Didik Prasetyoko Ellyzia Sukma Ningtiar Endang Purwanti Endang Purwanti Setyaningsih, Endang Purwanti Eva Agustina Fachruddin, Mochammad Harits Fadlan, Arif Farhanah Thalib Fithri Yatul Humairo Gunawan, Triyanda Gunawan, Triyanda Hamdan Dwi Rizqi Hamzah Fansuri Harmami Harmami Herdayanto Sulistyo Putro Humairo, Fithri Yatul Ihsan Wan Azelee Iqbal, Rendy Muhamad Irsandi Dwi Oka Kurniawan Irsandi Dwi Oka Kurniawan Ismail, Ahmad Fauzi Jaafar, Juhana Juhana Jaafar Juhana Jafar Kurnia Handayani Kusumawati, Yuly Linda Wati Oktavia Lukman Atmaja Lusi Ernawati M. Faqri Fahrozi Huzein Mada Mariana Lakapu Mahesan Naidu Mochammad Yusuf Irianto Muhammad Nidzhom Zainol Abidin Nanik Ismi Oktavianti Noor Shawal Nasri Nugraheni, Zjahra Vianita Nur Hadi Nur Izzati Abu Bakar Nurul Faradilah Said, Nurul Faradilah Oktavina Kartika Putri Ong, Chi Siang Perry Burhan, Perry Putri, Shabrina Adani R. A. Syukuri Nikmah, R. A. Rahmawati, Zeni Randy Yusuf Kurniawan Ratna Ediati Refdinal Nawfa Retno Puji Rahayu Rika Wijiyanti Rika Wijiyanti Romaya Sitha Silitonga Ruri Agung Wahyuono Safarina, Nourma Shabrina Adani Putri Shofiyani, Anis Syafsir Akhlus Taufik Qodar Romadiansyah Totok Trengginas Ufafa Anggarini Vina Rizky Andina Vivi Zulaicha Wahyu Prasetyo Utomo Wan Norharyati Wan Salleh Widi Citra Lestari Zetra, Yulfi Zulhairun Abdul Karim

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