scholarly journals Rice husk derived Aminated Silica for the efficient adsorption of different gases

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Rashed S. Bakdash ◽  
Isam. H. Aljundi ◽  
Chanbasha Basheer ◽  
Ismail Abdulazeez
Keyword(s):  
Rice Husk ◽  
Energy Gap ◽  
Chemical Properties ◽  
Separation Capacity ◽  
Physical And Chemical ◽  
First Time ◽  
Different Gases ◽  
Homo Lumo ◽  
Consequent Increase ◽  
And Chemical Properties

Abstract In this present work, we successfully prepared aminated silica (ASiO2) from rice husk ash (RHA) and functionalized with 3-aminopropyltriethoxysilane (APTES). Physical and chemical properties of the synthesized material were investigated by various techniques SEM–EDX, XPS, FTIR, TGA. The surface area of RHA was 223 m2/g, while for ASiO2 was 101 m2/g. Molecular level DFT calculations revealed that the functionalization of ASiO2 resulted in a significant decrease in the HOMO–LUMO energy gap, a reduction in hardness, and a consequent increase in charge transfer characteristics. The adsorption behavior at low pressure (1 atm.) of aminated silica on different gases CO2, CH4, H2, and N2 at temperatures 77, 273, 298 K was studied. The adsorption of hydrogen was reported for the first time on aminated silica with an excellent adsorption capacity of 1.2 mmol/g. The ASiO2 exhibited excellent performance in terms of gas separation in binary mixtures of CO2/CH4, CO2/N2 and CO2/H2 at 273, and 298 K, respectively. The catalyst further exhibits high stability during three cycles with less than 10% variation in the separation capacity.

scholarly journals A Study of Zooplankton Community in Dukan Lake, Kurdistan Region-Iraq, with a New Record of Craspedacusta sowerbii Lankester (1880) Medusa (Cnidaria: Hydrozoa)

2017 ◽  
Vol 14 (4) ◽  
pp. 735-741 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Similarity Index ◽  
Chemical Properties ◽  
Zooplankton Community ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Alkaline Side ◽  
Physical And Chemical ◽  
First Time ◽  
Jaccard's Similarity Index ◽  
And Chemical Properties

A study of Zooplankton community has been carried out at four selected sites on Dukan Lake. Samples of water and zooplankton were collected monthly for the period from July 2015 to February 2016. Some physical and chemical properties of water were studied and the results showed that the air temperature were ranged from 0 to 36.16 °C, water temperature ranged from 2.83 to 34.66 °C, hydrogen ion concentration of studied sites were found to lie in alkaline side, it was ranged between 6.87 to 8.57, electrical conductivity ranged from 190.79 to 850.08 µs.cm­¹, turbidity ranged from 0.9-7.7 NTU, and dissolved oxygen from 3.3 to 6.8 mg.l-¹ while BOD5 were ranged from 0.53 to 34.66 mg.l-¹. Concerning to the zooplankton, 37 species were identified which belonged to Cladocera (48.38%), Copepod (43.28%), Rotifera (8.23%), Targigrada (0.08%) and Cnidaria (0.1%). The medusa of Craspedacusta sowerbii Lankester (1880) was recorded for the first time in Iraq. Regarding to zooplankton community, rotifer were ranged between 0 to 690.91 ind.m-3, Copepoda from 54.55 to 5927.27 ind.m-3 and Cladocera ranged from 18.18 to 6072.73 ind.m-3. According to Shanon-Weiner index, species diversity for zooplankton invertebrates was ranged from 0.325 to 1.091 bits/ind. Jaccard’s similarity index showed that the highest similarity was recorded between site (1) and site (4) with 40.74%.

Physical and chemical properties of cement with nano black rice husk ash

2019 ◽  
Author(s):  
Ramadhansyah Putra Jaya ◽  
Mohd Ibrahim Mohd Yusak ◽  
Mohd Rosli Hainin ◽  
Nordiana Mashros ◽  
Muhammad Naqiuddin Mohd Warid ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Black Rice ◽  
Physical And Chemical ◽  
And Chemical Properties

Sila-Pharmaka, 9. Mitt. [1] Darstellung und Eigenschaften potentiell curarewirksamer Silicium-Verbindungen, I / Sila-Drugs, 9th Communication [1] Preparation and Properties of Silicon Compounds with Potential Curare-Like Activity, I

1978 ◽  
Vol 33 (4) ◽  
pp. 412-416 ◽  
Author(s):  
Reinhold Tacke ◽  
Roland Niedner
Keyword(s):  
Mass Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Organosilicon Compounds ◽  
Silicon Compounds ◽  
H Nmr ◽  
Toxicological Data ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

Abstract Organosilicon compounds 8, 9 and 10 with potential curare-like action and their precursors 5, 6 and 7 were synthesized for the first time. 5−10 were characterized by their physical and chemical properties, and their structures were confirmed by analyses, 1 H NMR and mass spectroscopy (only for 5−7). The pharmacological and toxicological data of 8, 9 and 10 are reported.

scholarly journals STUDY OF COMPOSITION, PHYSICAL AND CHEMICAL PROPERTIES AND BIOLOGICAL ACTIVITY OF POLYSACCHARIDE COMPLEX OF ARCTIUM LAPPA LEAVES

2017 ◽  
Vol 25 (1) ◽  
pp. 42-48
Author(s):  
I A. Sychev ◽  
D G. Kokina
Keyword(s):  
Chemical Properties ◽  
Erythrocyte Membranes ◽  
Physical And Chemical Properties ◽  
Qualitative Composition ◽  
Arctium Lappa ◽  
Polysaccharide Complex ◽  
Healthy Donors ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

A method of isolation of polysaccharide complex from the leaves of Burdock (Arctium lappa L.) is described in the article. For the first time the qualitative composition of this complex was determined, belonging to the group of heteroglycans. Some of physical and chemical properties of polysaccharide complex were studied. It is shown that polysaccharide complex increases catalase activity and peroxide resistance of the erythrocyte membranes of healthy donors. The study found that polysaccharide complex of Burdock improves physical performance of test animals.

THE BLOOM AND TOXICITY OF CYANOBACTERIA IN LAKE SEVAN

2020 ◽  
Vol 54 (2 (252)) ◽  
pp. 168-176
Author(s):  
L.R. Hambaryan ◽  
L.G. Stepanyan ◽  
M.V. Mikaelyan ◽  
Q.G. Gyurjyan
Keyword(s):  
Algal Blooms ◽  
Littoral Zone ◽  
Algal Bloom ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Lake Sevan ◽  
Phosphate Ions ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

Seasonal hydrochemical, hydrophysical, and phytoplankton studies were conducted in a littoral zone of Lake Sevan in 2019. It is known that in recent years widespread algal blooms were usually started from the littoral zone of Big Sevan, and then spread towards the pelagic zone of the lake. The bloom was mainly caused by species belonging to the genus Dolichospermum (previously Anabaena). Our study has revealed that the physical and chemical properties of water were changed as a result of algal bloom. Particularly, the transparency of water and concentration of dissolved oxygen decreased, while the concentrations of ammonium, nitrite and phosphate ions increased. For the first time, the presence of the toxins microcystin and anatoxin-a was recorded in the lake.

scholarly journals Production of lettuce seedlings in substrates with tung compost, carbonized rice husk and earthworm humus

2017 ◽  
Vol 35 (2) ◽  
pp. 174-179 ◽  
Author(s):  
Maristela Watthier ◽  
Magnólia AS Silva ◽  
José E Schwengber ◽  
Maria H Fermino ◽  
Tiago V Custódio
Keyword(s):  
Rice Husk ◽  
Chemical Properties ◽  
Total Porosity ◽  
Nutrient Content ◽  
Dry Density ◽  
Physical And Chemical Properties ◽  
Randomized Design ◽  
Shoot Mass ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACT Different properties of substrates based on tung compost (TC), carbonized rice husk (CRH) and earthworm humus (H) were analyzed, besides the effect of the formulations on the production of lettuce seedlings, cv. Veneranda. The experiment was carried out in Pelotas, Rio Grande do Sul State, Brazil, from December 2012 to February 2013, in a greenhouse, using completely randomized design with seven treatments and three replications. The used substrates were formulated on a volume basis: T1= commercial substrate S10® (control); T2= 90% carbonized rice husk (CRH) + 10% humus (H); T3= 75% CRH + 15% tung compost (TC) + 10% H; T4= 55% CRH + 35% TC + 10% H; T5= 35% CRH + 55% TC + 10% H; T6= 15% CRH + 75% TC + 10% H; T7= 90% TC + 10% H. Seedlings were produced in polystyrene trays with 200 cells, being evaluated 35 days after sowing. The substrate with larger proportion of CRH (T2 with 90% CRH) showed suitable dry density (DD) and total porosity (TP), high pH and aeration space (AS), low easily available water (EAW), electric conductivity (EC), and nutrient content, constituting an inert substrate, not being indicated as substrate due to the lower development of the seedlings. Using 15% TC, an increase was noticed in DD, AEW, EC and nutrients and, a decrease in TP, AS and pH due to, mainly, the size of tung compost particles, which accommodated themselves and altered physical and chemical properties of the substrates. Substrates with 90% and 75% TC (T7 and T6) provided the greatest shoot length, fresh and dry shoot mass and leaf area for lettuce seedlings due to higher nutrient content, also considering physical and chemical properties of these substrates. Pure CRH is not indicated to be used as substrate, but mixed with tung compost (T6), it provides high quality seedlings. Tung compost was effective in producing lettuce seedlings, since the composting is able to eliminate phytotoxic substances from this material which can hinder the seedling growth.

NEW CONSIDERATIONS IN ORGANOGERMANIUM-SULPHUR CHEMISTRY

1963 ◽  
Vol 41 (5) ◽  
pp. 1276-1280 ◽  
Author(s):  
Malcolm C. Henry ◽  
Wenzel E. Davidson
Keyword(s):  
Chemical Properties ◽  
Group Iv ◽  
Physical And Chemical Properties ◽  
Sulphur Compounds ◽  
New Compounds ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

The successful synthesis of sodium triphenylgermanethiol (1), (C6H5)3GeSNa, and disodium diphenylgermanedithiol, (C6H5)2Ge(SNa)2, have made it possible to carry out reactions with RX type compounds yielding a variety of organogermanium-sulphur compounds. In addition, triphenylgermanethiol, (C6H5)3GeSH, has been synthesized for the first time. Reactions of these compounds are related to analogous group IV element compounds. Physical and chemical properties of these new compounds are also discussed.

scholarly journals Anatomical characterization, physical, and chemical properties of wood of Quercus macdougallii Martínez, endemic species of the Sierra Juárez of Oaxaca, Mexico

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5975-5998
Author(s):  
Faustino Ruiz-Aquino ◽  
Lizbeth Luna-Bautista ◽  
Aremi E. Luna-Bautista ◽  
Wenceslao Santiago-García ◽  
Luis F. Pintor-Ibarra ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Physical Properties ◽  
Endemic Species ◽  
Basic Density ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Cellulose Pulp ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

The anatomical characteristics and the physical and chemical properties of wood of Quercus macdougallii Martínez are presented for the first time. Q. macdougallii Martínez is an endemic species of the Sierra Juarez of Oaxaca. The microscopic characteristics were described in preparations of typical cuts and dissociated material. The physical properties were evaluated according to the ASTM D 143-94 standard in sapwood and heartwood specimens. The measurable elements and physical properties were classified according to the mean. With the measurable elements, the paper pulp quality index was determined. In sapwood and heartwood, the basic chemical composition was determined. The wood of Q. macdougallii presented a pronounced grain, a thick texture, and a straight thread. Fibers, fibrotracheids, uniseriate, multiseriate, and aggregate rays were found. Basic density 0.55 g cm-3 in sapwood and 0.61 g cm-3 in heartwood is classified as moderately heavy and heavy, respectively. The saturation point of the fiber is classified as high. Based on its physical properties, Q. macdougallii wood can be used in the manufacture of furniture, veneer, floors, tool handles, and construction. Based on the pulp quality indices and chemical composition, this wood could be used to obtain cellulose pulp for paper.

Interfacial study of nanophase Pt or Pd particles on the surface of nanophase WO3 or TiO2 particles

1993 ◽  
Vol 51 ◽  
pp. 1122-1123
Author(s):  
Chi-Ming Hsu ◽  
Hong-Ming Lin ◽  
Chiun-Yen Tung ◽  
Teh-Yu Hsu ◽  
Chao-Cheng Yang
Keyword(s):  
Active Sites ◽  
Crystal Size ◽  
Energy Gap ◽  
Pure Titanium ◽  
Chemical Properties ◽  
Gas Condensation ◽  
The Family ◽  
Multi Phase ◽  
Physical And Chemical ◽  
And Chemical Properties

Nanocrystalline (NC) metals are a subdivision of the family of nanostructural materials. Nanostructural materials are single phase or multi-phase polycrystals, the crystal size of which is of the order of a few (typically 1-100) nanometers in at least one dimension. Nanocrystalline materials have many interesting physical and chemical properties which attract researchers. Particularly in catalyst’s utility, it can provide a large specific surface area and active sites. Its size efficiency (Kubo efficiency) may create different electron energy gap which permits us to do other functional designs. Some phenomenons contribute to attractiveness of nanocrystalline material as catalysts or sensors. The interfacial study between NC metal and oxides became an important issue to evaluate the performance of the these applications.Gas-condensation technique is used to produce the nanophase WO3 or TiO2 by evaporating the tungsten in 10 mbar O2 atmosphere or pure titanium in (10 mbar O2/90 mbar He) atmosphere, respectively.

Sign in / Sign up

Export Citation Format

Share Document