scholarly journals Effect of acryloylation on superabsorbency of starch copolymers

2020 ◽  
Vol 31 (1) ◽  
pp. 9-13
Author(s):  
Aliyu Danmusa Mohammed ◽  
Yusuf Hassan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Vinyl Monomer ◽  
Degree Of Substitution ◽  
Water Absorbency ◽  
Initiation System ◽  
Ft Ir ◽  
Scanning Electron

AbstractStarch is acryloylated and copolymerised without incorporating any vinyl monomer such as acrylic acid or acrylonitrile monomers to produce a superabsorbent copolymer. Fenton’s initiation system was used to produce polyacryloylated starch ester with varying degree of substitution. The copolymer from starch ester exhibited improved solubility, and an impressive water, saline, and solvents uptake. The superabsorbency of the samples is affected by the number of acryloyl groups on starch backbone. The starch ester with degree of substitution 0.8 had the highest water absorbency (102 g/g) in this experiment. Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermogravimetric (TGA) analyses were used to characterize the products.

scholarly journals Penyerapan Zat Warna Basic Red 18 dan Direct Black 38 dengan Menggunakan Sabut Pinang sebagai Adsorben

2019 ◽  
Vol 14 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Muhammad - Muhammad ◽  
Azhari - Muhammad Syam ◽  
Ishak - Ibrahim ◽  
Nurfarida - Nurfarida ◽  
Darmadi - Darmadi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Ft Ir ◽  
Scanning Electron

 AbstrakAdsorpsi zat warna basic red 18 dan direct black 38 dengan adsorben dari serat pinang telah diteliti. Morfologi dan gugus fungsi permukaan serat pinang dianalisa dengan Fourier transform infrared spectroscopy (FT-IR) dan scanning electron microscopy (SEM). Penelitian ini fokus pada mekanisme adsorpsi dan pengaruh dosis adsorben. Koefisien korelasi (R2) dianalisis dengan menggunakan regresi linier. Mekanisme adsorpsi dilakukan dengan menggunakan dua model isoterm, yaitu isoterm Langmuir dan Freundlich. Hasil kajian menunjukkan bahwa model Freundlich adalah yang paling sesuai diaplikasikan untuk adsorpsi zat warna basic red 18 dan direct black 38. Karena model Freundlich mampu menginterpretasikan proses adsorpsi zat warna basic red 18 dan direct black 38 dengan baik, maka sistem adsorpsi yang digunakan dalam penelitian ini adalah heterogen. Kapasitas adsorpsi untuk basic red 18 pada berbagai berat adsorben (seperti: 1, 2, dan 3 g) menggunakan model Freundlich adalah 0,234 L/g; 0,101 L/g dan 0,093 L/g.  Sementara kapasitas untuk direct black 38 adalah 0,360 L/g; 0,374 L/g dan 0,141 L/g.  

Optimization of ammonia nitrogen removal by SO42− intercalated hydrotalcite using response surface methodology

RSC Advances ◽  
2016 ◽  
Vol 6 (54) ◽  
pp. 48329-48335 ◽  
Author(s):  
Heng-Zhi Duan ◽  
Hong-Yan Zeng ◽  
Hua-Miao Xiao ◽  
Chao-Rong Chen ◽  
Gao-Fei Xiao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Response Surface Methodology ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ammonia Nitrogen ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

SO42− intercalated Mg–Al hydrotalcite (S-LDH) was prepared under microwave irradiation and characterized by powder X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM).

Pd/Fe Nanoparticles as Catalytic Reductant Immobilized in Hydrophilized PVDF Membrane to Dechlorinate Monochloroacetic Acid

2013 ◽  
Vol 664 ◽  
pp. 562-565
Author(s):  
Zhao Hong Meng ◽  
Hui Ling Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Monochloroacetic Acid ◽  
Pvdf Membrane ◽  
Fe Nanoparticles ◽  
Ft Ir ◽  
Scanning Electron

PVDF membrane was modified by hydrophilization method, Pd/Fe nanoparticles were successful immobilized in hydrophilized PVDF membrane as catalytic reduant to dechlorinate monochloroacetic acid, the Pd/Fe nanoparticles characterized by Scanning Electron Microscopy (SEM). The hydrophilized PVDF membrane was characterized by Fourier Transform Infrared Spectroscopy (FT-IR). The PVDF membrane immobilized Pd/Fe nanoparticles (NPs) as caralytic reducant was used to dechlorinate monochloroacetic acid (MCAA), the monochloracetic acid dechlorination efficiency was high.

scholarly journals Archaeometric analysis of architectural ceramics form the site “Khustiin bulag” Tuv province, Mongolia

2020 ◽  
pp. 15-24
Author(s):  
Suvd-Erdene Byambasuren ◽  
Ishtseren Lochin ◽  
Tengis Saran ◽  
Orgil Baatarjav ◽  
Eregzen Gelegdorj ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Hydrated Iron Oxide ◽  
Yellow Ochre ◽  
Ft Ir ◽  
Excavation Site ◽  
Scanning Electron

A series of architectural ceramics, including roof tiles and bricks from the excavation site at Khustyn Bulag, Mungunmorit soum, Tuv aimag (province) of Mongolia were subjected to detailed archaeometric analysis. We present here results of Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM-EDS) and Thermogravimetric analysis (TGA) and their potential to determine the composition of brick samples from one excavation site, and their firing temperatures. In addition, yellow ochre, which is a natural earth rock pigment that contains hydrated iron oxide and represents the most common pigment of antiquity, was revealed at this excavation site. The mineral composition of ochres will be determined and the possible use of it will be discussed.

Preparation of near-infrared laser responsive hydrogels with enhanced laser marking performance

Soft Matter ◽  
2019 ◽  
Vol 15 (14) ◽  
pp. 2950-2959 ◽  
Author(s):  
Zheng Cao ◽  
Yuyuan Chen ◽  
Cheng Zhang ◽  
Junfeng Cheng ◽  
Dun Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Near Infrared ◽  
Laser Marking ◽  
Ft Ir ◽  
Oxide Particles ◽  
Responsive Hydrogels ◽  
Scanning Electron

Polystyrene modified bismuth oxide particles (PS@Bi2O3) were prepared and characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM).

Preparation of Borosilicate Xerogel and Research on its Mineralization

2012 ◽  
Vol 476-478 ◽  
pp. 2059-2062
Author(s):  
Chen Wang ◽  
Ya Dong Li ◽  
Gu Qiao Ding
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ph Value ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compositional Changes ◽  
Scanning Electron

Tributyl borate was first adopted for the introduction of boron in the preparation of bioactive borosilicate xerogel by sol-gel method. The xerogel reacted continuously in 0.25M K2HPO4 solution with a starting pH value of 7.0 at 37 °C for 1day. The structural, morphologies and compositional changes resulting from the conversion were characterized using X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy. The results indicated that speed of formation of HA was cut way back on the time with the addition of boron and the induction period for the HA nucleation on the surface of the borosilicate xerogel was short than 1 days. The conversion mechanism of the borosilicate xerogels to hydroxyapaptite was also discussed.

scholarly journals The Characteristics of Padamarang Magnesite under Calcination and Hydrothermal Treatment

2019 ◽  
Vol 29 (2) ◽  
Author(s):  
Mutia Dewi Yuniati ◽  
Feronika Cinthya Mawarni Putri Wawuru ◽  
Anggoro Tri Mursito ◽  
Iwan Setiawan ◽  
Lediyantje Lintjewas
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Hydrothermal Treatment ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Magnesite (MgCO3) is the main source for production of magnesium and its compound. In Indonesia, magnesite is quite rare and can be only found in limited amount in Padamarang Island, Southeast Sulawesi Provence. Thus the properties of magnesite and the reactivity degree of the obtained product are of technological importance. The aim of this work was to analyze the characteristics of Padamarang magnesite under calcination and hydrothermal treatment processes. The processes were carried out at various temperatures with range of 150-900°C for 30 minutes. The solids were characterized with respect to their chemical and physical properties by using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). SEM image indicates that magnesite was formed from thin and flat hexagon sheets. The FTIR and XRD analysis disclose that MgO formed at temperature above 300°C, where as the magnesite sample also lost its mass around 50%. These results demonstrate that Padamarang magnesite decomposes to magnesium oxide and carbon dioxide at high temperature.Magnesit (MgCO3) merupakan sumber utama untuk produksi magnesium dan senyawa-senyawanya. Di Indonesia, magnesit cukup jarang dan hanya dapat ditemukan dalam jumlah yang terbatas di Pulau Padamarang, Propinsi Sulawesi Tenggara. Oleh karena itu sifat magnesit dan derajat reaktivitas dari produk-produk magnesit penting untuk diketahui. Penelitian ini bertujuan untuk menganalisis karakteristik magnesit Padamarang dengan perlakuan kalsinasi dan hidrothermal.  Proses dilakukan pada temperatur yang bervariasi dari 150-900°C selama 30 menit. Sifat kimia dan fisika dari magnesit dikarakterisasi dengan menggunakan scanning electron microscopy dengan energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), dan X-ray diffraction (XRD). Gambar dari analisis SEM menunjukkan bahwa magnesit terbentuk dari lembaran-lembaran heksagonal yang tipis dan datar. Hasil analisis dengan FTIR dan XRD menunjukkan bahwa MgO terbentuk pada temperatur diatas 300°C, dimana sampel magnesit juga kehilangan massanya sekitar 50% pada suhu tersebut. Hal ini menunjukkan bahwa Magnesit Padamarang terdekomposisi menjadi magnesium oksida dan karbon dioksida pada temperatur tinggi.

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