scholarly journals STUDI PENGARUH PERBANDINGAN REAKTAN LIGNIN NaHSO3 DAN pH TERHADAP NATRIUM LIGNOSULFONAT (NaLS)

2015 ◽  
Vol 1 (2) ◽  
pp. 133
Author(s):  
Gustini Syahbirin ◽  
Ani Suryani ◽  
Tesar Dzikrulloh
Keyword(s):  
Functional Group ◽  
Black Liquor ◽  
Sodium Lignosulfonate ◽  
Visible Absorption ◽  
Concrete Admixtures ◽  
Initial Ph ◽  
Soda Pulping ◽  
Uv Visible ◽  
Soda Lignin

 ABSTRACT Lignin was isolated from waste black liquor of soda pulping process. Sulfonation of soda lignin produced Sodium Lignosulfonate (NaLS) which can be used as dispersants, and concrete admixtures. In this research, sulfonation was carried out towards lignin with ratio of lignin-NaHSO3 of 1.0:0.4; 1.0:0.5; and 1.0:0.6, and initial pH of 5.00; 6.00; 7.00. Parameters observed were purity, final pH, and yield of NaLS. The upsurge of initial pH increased the final pH and NaLS yield, but decreased its purity. The upsurge of ratio of lignin-NaHSO3 increased NaLS yield and decreased its purity, but did not affect the final pH of NaLS. The chosen optimum condition was on pH of 6.00 and ratio of lignin-NaHSO3 of 1.0:0.6. Characterization of functional group using FTIR, and purity of NaLS using UV-Visible Absorption Spectrophotometer. Keywords: soda lignin, sulfonation of lignin, sodium lignosulfonate 

Synthesis of Fluorescent Magnetic and Plasmonic-Hybrid Multifunctional Nanopaticles

2014 ◽  
Vol 1081 ◽  
pp. 161-164
Author(s):  
Xue Mei Li ◽  
Zheng Guan ◽  
Hong Ling Liu ◽  
Jun Hua Wu ◽  
Xian Hong Wang ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Zno Nanoparticles ◽  
Poly Ethylene Glycol ◽  
Visible Absorption ◽  
Transmission Electron ◽  
Good Magnetic Property ◽  
Uv Visible ◽  
Poly Ethylene ◽  
Poly Propylene

FeAu/ZnO nanoparticles were successfully synthesized by nanoemulsion process with the use of poly (ethylene glycol)-block-poly (propylene glycol)-block-poly (ethylene glycol) as the surfactant. The characterization of the FeAu/ZnO nanoparticles was performed using X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and UV-visible absorption spectroscopy, showing that the polymer-laced nanoparticles reveal high crystallinity, excellent dispersibility and well defined optical performance. The process of solvent dispersion-collection of FeAu/ZnO nanoparticles indicates that the nanoparticles possess good magnetic property for applications.

scholarly journals Synthesis and Characterization of New Palladium(II) Schiff Base Complexes Derived from β-Diketones and Diamines

2020 ◽  
Vol 32 (5) ◽  
pp. 1039-1042
Author(s):  
Mridula Gupta ◽  
Sheela M. Valecha
Keyword(s):  
Schiff Base ◽  
Schiff Base Complexes ◽  
Schiff Base Ligands ◽  
Visible Absorption ◽  
Oh Groups ◽  
Uv Visible ◽  
Coordinated Water ◽  
Heterocyclic Schiff Bases ◽  
Phenolic Oh Groups

A new series of heterocyclic Schiff bases were prepared from condensation of 1-phenyl-3-methyl-4-acetyl/benzoyl-pyrazolone with 4,4′-diaminodiphenylmethane and 4,4′-diaminodiphenyl ether, resulting in the formation of four novel Schiff base ligands. These ligands were then treated with ethanolic solution of PdCl2, to form corresponding palladium(II) complexes. These complexes were characterized by elemental analysis, IR, 1H NMR, TGA, magnetic susceptibility measurements and UV-visible absorption spectroscopy. All the Pd(II) complexes were found to have one coordinated water molecule. Schiff base ligands chelated with the metal atom through two donor sites N and O of azomethine (-C=N-) and phenolic (-OH) groups, respectively.

Characterization of electronic structure and defect states of thin epitaxial BiFeO3 films by UV-visible absorption and cathodoluminescence spectroscopies

2008 ◽  
Vol 92 (22) ◽  
pp. 222901 ◽  
Author(s):  
A. J. Hauser ◽  
J. Zhang ◽  
L. Mier ◽  
R. A. Ricciardo ◽  
P. M. Woodward ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Defect States ◽  
Visible Absorption ◽  
Uv Visible

The Research of Gas-Sensing and Optical Characterization of Chlorinated Metallic Porphyrin Spin-Coated Films

2012 ◽  
Vol 531-532 ◽  
pp. 58-62 ◽  
Author(s):  
Wen Yao Yang ◽  
Jian Hua Xu ◽  
Si Yu Wang ◽  
Yan Chen
Keyword(s):  
Sensor Array ◽  
Gas Sensing ◽  
Spectral Response ◽  
Visible Absorption ◽  
Gas Sensor Array ◽  
Volatile Organic ◽  
Uv Visible ◽  
J Aggregates ◽  
Quartz Substrates

In this text, the Chlorinated metallic porphyrin (TPPMncl and TPPFecl) thin films were fabricated by Spin-coated technique onto quartz substrates. In order to search for the gas-sensing characterization of Chlorinated metallic porphyrin Spin-coated films, the changes of UV-Visible absorption spectrums of TPPMncl and TPPFecl Spin-coated films respectively exposed in vapor of Chloroform, pyridine, Ammonia, triethylamine and dimethylamine were analyzed. The experimental results show that, the spectral response of TPPMncl and TPPFecl on organic gas molecular is obviously found. And we know that chlorinated metallic porphyrin film formed the J-aggregates. Moreover, through two kinds of chlorinated metallic porphyrin integral area rate of histogram, it is easy to identify and distinguish between the four kinds of volatile organic compounds. It indicates that these Chlorinated metallic porphyrin have gasochromic characteristics while responding with organic gas. Therefore, these materials can be prepared into gas sensor array for detecting VOCS.

Synthesis of Cadmium and its Oxide Nanomaterials by Pulsed Laser Ablation in Aqueous Media

2008 ◽  
Vol 1074 ◽  
Author(s):  
Subhash Chandra Singh ◽  
Rajkumar Swarnkar ◽  
Ram Gopal
Keyword(s):  
Laser Ablation ◽  
Colloidal Solution ◽  
Aqueous Media ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Distilled Water ◽  
Visible Absorption ◽  
Cadmium Metal ◽  
Uv Visible

ABSTRACTCadmium based oxide and hydroxide nanocomposites material is synthesized by pulsed laser ablation of cadmium metal in the double distilled water. A piece of cadmium metal, placed on the bottom of glass vessel containing double distilled water, was irradiated with 1064 nm of pulsed Nd:YAG laser operating at 35 mJ/pulse energy and 10 ns pulse width for 30 minutes. Colloidal solution of produced Nanoparticles is found stable for two days. Fine white colored powder is obtained after drying centrifuged solution. UV-visible absorption of colloidal solution, XRD, TGA, DTA and FTIR of the powder is used for the characterization of material. Possible mechanism of synthesis and hydroxide to oxide transition is discussed.

Tetra-2,3-pyrazinoporphyrazines with externally appended pyridine rings. 18. Physicochemical properties and photochemical behavior of new uncharged water soluble low-symmetry macrocycles [{Pd(OAc)2}3(PtCl2)LM] (M = MgII(H2O), ZNII, PdII)

2017 ◽  
Vol 21 (04-06) ◽  
pp. 334-344 ◽  
Author(s):  
Maria Pia Donzello ◽  
Fabio Gigante ◽  
Fabiola Sciscione ◽  
Elisa Viola ◽  
Karl M. Kadish
Keyword(s):  
Physicochemical Characterization ◽  
Water Soluble ◽  
Experimental Conditions ◽  
Visible Absorption ◽  
New Class ◽  
Enhanced Solubility ◽  
Uv Visible ◽  
Low Symmetry ◽  
Visible Absorption Spectroscopy

The synthesis and physicochemical characterization of a new class of low-symmetry water soluble heteropentanuclear porphyrazine complexes are described. The investigated compounds, represented as [{Pd(OAc)[Formula: see text]}[Formula: see text](PtCl[Formula: see text]LM] •xH[Formula: see text]O where L [Formula: see text] tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazinato dianion, M [Formula: see text] Mg[Formula: see text](H[Formula: see text]O), Zn[Formula: see text] or Pd[Formula: see text] and [Formula: see text] 3–8, were prepared under mild experimental conditions from the previously described heterobimetallic compounds [(PtCl[Formula: see text]LM]. Peripheral binding of one PtCl[Formula: see text]and three Pd(OAc)[Formula: see text]units in the new series of compounds occurs at the vicinal pyridine N atoms of each dipyridinopyrazine fragment via a “py–py” coordination. The newly synthesized porphyrazines were characterized by IR measurements in the solid state and UV-visible absorption spectroscopy in the polar nonaqueous solvents pyridine, dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) as well as in water, the enhanced solubility in this medium being due to the presence of the external Pd(OAc)[Formula: see text] moieties. Data on the photosensitizing activity of the compounds for the generation of singlet oxygen, [Formula: see text]O[Formula: see text] were also obtained in DMF and should be of interest to researchers in the area of photodynamic therapy.

scholarly journals Characterization of Cubic AgSbS2Nanostructured Flowers Synthesized by Microwave-Assisted Refluxing Method

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Narongrit Tipcompor ◽  
Somchai Thongtem ◽  
Titipun Thongtem
Keyword(s):  
Electron Microscopy ◽  
Energy Gap ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Microwave Assisted ◽  
Direct Energy ◽  
Uv Visible ◽  
Direct Energy Gap

Cubic AgSbS2nanostructured flowers of nanorods were successfully synthesized by microwave-assisted refluxing of AgNO3, Sb(CH3COO)3, and L-cysteine (C3H7NO2S) dissolved in ethylene glycol at the pH of 4, characterized by X-ray diffraction (XRD) and electron microscopy (EM). The 1.89 eV direct energy gap was determined by UV-visible absorption, including two 688 and 857 nm emission wavelengths by photoluminescence (PL) spectroscopy. A possible formation mechanism of AgSbS2nanostructured flowers was also proposed according to the experimental results.

Synthesis and Characterization of SiO2/ZnO Core-Shell Spheres

2011 ◽  
Vol 320 ◽  
pp. 140-145
Author(s):  
Yung Kuan Tseng ◽  
Pei Han Wang ◽  
Shun Lung Su
Keyword(s):  
Uv Light ◽  
Spherical Surface ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Core Shell ◽  
Visible Absorption ◽  
Stöber Method ◽  
Eds Analysis ◽  
Uv Visible

This Study applies to Stöber method for synthesis an characterization of even-sized SiO2micrometer sphere; and then applies to sol-gel method for encapsulation for one layer of ZnO at SiO2spherical surface after regarded it as core so that synthesis SiO2/ZnO core-shell spheres successfully. And observe morphology by FE-SEM and crossection by TEM. The TEM specimen were cut by two-beam FIB. Besides, EDS, XRD and UV-Visible spectroscopy were using for the analysis of composition, crystallization structure, and absorption spectrum, respectively. Experimental results showed that, SiO2spherical surface became smooth after deposition for zinc oxide. The specimen made by FIB more obviously was observed for core-shell distribution by TEM. EDS analysis made us clearly see shell signal with ZnO content, but core signal only is SiO2content. XRD analysis indicated its core-shell sphere signal possessing ZnO content, but UV-Visible absorption spectrometer displayed ZnO has been absorbed in range of UV light, in contrast, it is not absorbed in range of visible light.

Development of Immobilized Activated Carbon-Enzyme for Decolorization of Black Liquor

2018 ◽  
Vol 775 ◽  
pp. 402-407 ◽  
Author(s):  
Ajeng Arum Sari ◽  
Ummu Hanifah ◽  
Yusnita Parmawati ◽  
Rahadian Permadi
Keyword(s):  
Activated Carbon ◽  
Functional Group ◽  
Immobilized Enzyme ◽  
Black Liquor ◽  
High Potential ◽  
Crude Enzyme ◽  
Wave Number ◽  
Bead Surface

Combination of activated carbon and crude enzyme that immobilized in alginate was developed immobilized enzyme to decolorize black liquor. Characterization of material and black liquor were analyzed by using SEM and FTIR. The study revealed that immobilized activated carbon-enzyme has high decolorization during the removal of black liquor. It has able to decolorize black liquor up to 97.7% for 5 hours. Further, it also reduced COD as 66.77%, pH 9, and TDS 7.42 g/L. Characterization of black liquor by using FTIR showed that the beads after treatment has addition of functional group such as C-O phenol at wave number 1220.94 cm-1 and C-O-C ether at wave number 1060.85 cm-1 from (C-O-C) ether. Characterization of immobilized activated carbon-enzyme by using SEM showed that this bead before treatment was more granulated than after treatment. After treatment, the bead surface was more homogeneous. Conclusively, immobilized activated carbon-enzyme is a high potential adsorption for the removal of black liquor.

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