scholarly journals Recycling of buffing dust tanneries waste to prepare structural thermal insulation panels

2021 ◽  
Author(s):  
Wajad Ulfat ◽  
Ayesha Mohyuddin ◽  
Muhammad Amjad ◽  
Shagufta Saeed ◽  
Beenish Mujahid
Keyword(s):  
Thermal Insulation ◽  
Chemical Properties ◽  
Composite Panels ◽  
Ftir Analysis ◽  
Leather Industry ◽  
Weight Percentage ◽  
Blowing Agent ◽  
Physico Chemical ◽  
Sem Study ◽  
Prepared Composite

Abstract Thermal insulation panels were prepared by mixing the buffing dust obtained from tanneries waste with the polystyrene. The ratio in weight percentage of buffing dust, polystyrene and blowing agent was 20:77:3 respectively in these panels. The samples were prepared in co-twine extruder at 210 oC. Different physico-chemical properties were investigated for these samples that are required to analyze the usability of a material for construction. The composite panels showed better thermal insulation characteristics than the simple polystyrene boards. This study demonstrated that prepared composite panels have good thermal conductivity (0.029 W/m-K at 27 oC), density (300 Kg/m3), compression strength (6.25 ton) and water absorption (7.5%) without degradation of mechanical properties. Thermogravimetric analysis depicted that composite panels were thermally stable from 200 oC to 412 oC. FTIR analysis showed that composite has carbonyl and free amino functional groups. The SEM study explained that voids were created in the composite and homogeneousity was decreased after the addition of buffing dust. The composite had 62% of carbon and 0.2% of chromium as determined by EDX analysis. The results suggested that the prepared composite panels can be used as thermal insulation boards in building sector which will help in the recycling of waste produced by leather industry and consequently a reduction in environmental pollution.

scholarly journals Kinetics of transesterification of Madhuca Indica oil over modified zeolites: biodiesel synthesis

2015 ◽  
Vol 50 (4) ◽  
pp. 271-278 ◽  
Author(s):  
SR Pratap ◽  
SZM Shamshuddin ◽  
N Thimmaraju ◽  
M Shyamsundar ◽  
SS Reena
Keyword(s):  
Catalytic Activity ◽  
Chemical Properties ◽  
Ftir Analysis ◽  
Reaction Conditions ◽  
Physico Chemical ◽  
Biodiesel Synthesis ◽  
Basic Zeolites ◽  
Modified Zeolites ◽  
Kinetics Of ◽  
Nay Zeolites

In this article production of biodiesel from Madhuca indica oil (MI-oil) containing high % of free fatty acids (FFA) by transesterification process with methanol over basic zeolites such as NaY loaded with 5-25% KOH is presented. The zeolites were characterized by PXRD, BET and CO2-TPD methods prior to their catalytic activity studies. Optimization of reaction conditions for transesterification was conducted in order to get highest possible yield of biodiesel. 1HNMR and FTIR analysis confirms the conversion of MI-oil to biodiesel. The physico-chemical properties of MI-biodiesel were found to be comparable with that of the standard biodiesel. The NaY and KOH/NaY zeolites were found to be efficient and reusable catalysts without much loss of their catalytic activity when used for several times in biodiesel production.Bangladesh J. Sci. Ind. Res. 50(4), 271-278, 2015

scholarly journals ISOLATION AND IDENTIFICATION OF FUNGI GROWING ON FIBRE HEMP SHIVE BASED THERMAL INSULATION MATERIALS

2018 ◽  
Author(s):  
Dovilė VASILIAUSKIENĖ ◽  
Giedrius BALČIŪNAS ◽  
Jaunius URBONAVIČIUS
Keyword(s):  
Thermal Insulation ◽  
Hydrolytic Enzymes ◽  
Chemical Properties ◽  
Fungal Growth ◽  
Isolation And Identification ◽  
Insulation Materials ◽  
Physico Chemical ◽  
Identification Of Fungi ◽  
Properties Of Materials ◽  
Microbial Action

Green thermal insulation materials are ecological materials with hemp, linen, jute, wood waste, maize starch, and other types of waste added to polymer-based composites. Such kind of materials are susceptible to the microbial action which can lead to changes of physico-chemical properties of materials, their destruction and also health problems in humans. Here, we isolated and identified several fungal strains that grow on fibre hemp shive based materials. Three isolates were identified as belonging to Trichoderma (Hypocrea) genus. Our further experiments will be concentrated on the monitoring of growth of newly isolated fungi on and/or inside the materials of interest, isolation and characterisation of the hydrolytic enzymes as well as following the mode of material destruction caused by the fungal growth.

scholarly journals Physico-Chemical Properties of a Hybrid Biomaterial (PVA/Chitosan) Reinforced with Conductive Fillers

2021 ◽  
Vol 11 (7) ◽  
pp. 3040
Author(s):  
A. Olarte-Paredes ◽  
J.N. Salgado-Delgado ◽  
E. Rubio-Rosas ◽  
A.M. Salgado-Delgado ◽  
H. Hernández-Cocoletzi ◽  
...  
Keyword(s):  
Morphological Analysis ◽  
Chemical Properties ◽  
Ftir Analysis ◽  
Mechanical Tension ◽  
Nyquist Diagram ◽  
Energy Diffusion ◽  
Tension Tests ◽  
Physico Chemical ◽  
The Matrix ◽  
Conductive Fillers

In this study, a novel hybrid material based on Polyvinyl Alcohol-Chitosan (PVA-Chi) was made, reinforced with conductive fillers such as the polypyrrole (PPy), Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS), carbon black (CB), and multi-wall carbon nanotube (MWCNT). In order to observe the mechanical and electrical responses of this composite material, for obtaining composite materials, and to characterize them for the development of applications in engineering, FTIR analysis made clear the different functional groups present in the matrix and the fillers used. Using quaternary mixtures (4 fillers) increased the contact angle, which increased hydrophobicity of the biocomposite. The Nyquist diagram of the analyzed samples showed a decrease in resistance and energy diffusion; the latter because of transferring electrons caused by the conductive polymers CB and the MWCNT. In the mechanical tension tests, Young’s modulus values of 18.386 MPa were obtained, in contrast with the material matrix of PVA-Chi, which showed values of 11.628 MPa. Morphological analysis by SEM showed the materials got were homogeneous. The materials got showed higher electrical conductivity in the OH’s presence and NH2 groups, which could have possible applications in biopolymer electrodes.

Development of a flexible composite from leather industry waste and evaluation of their physico-chemical properties

2017 ◽  
Vol 19 (8) ◽  
pp. 2171-2178 ◽  
Author(s):  
Pallav Saikia ◽  
Tridip Goswami ◽  
Dipanka Dutta ◽  
Niren Kumar Dutta ◽  
Pinaki Sengupta ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Leather Industry ◽  
Industry Waste ◽  
Physico Chemical

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

Physico-Chemical Properties of Recombinant Desulphatohirudin

1990 ◽  
Vol 63 (03) ◽  
pp. 499-504 ◽  
Author(s):  
A Electricwala ◽  
L Irons ◽  
R Wait ◽  
R J G Carr ◽  
R J Ling ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Gel Filtration ◽  
Chemical Properties ◽  
Alpha Helix ◽  
Apparent Molecular Weight ◽  
Correlation Spectroscopy ◽  
Nmr Studies ◽  
Recombinant Hirudin ◽  
Physico Chemical ◽  
Recombinant Molecule

SummaryPhysico-chemical properties of recombinant desulphatohirudin expressed in yeast (CIBA GEIGY code No. CGP 39393) were reinvestigated. As previously reported for natural hirudin, the recombinant molecule exhibited abnormal behaviour by gel filtration with an apparent molecular weight greater than that based on the primary structure. However, molecular weight estimation by SDS gel electrophoresis, FAB-mass spectrometry and Photon Correlation Spectroscopy were in agreement with the theoretical molecular weight, with little suggestion of dimer or aggregate formation. Circular dichroism studies of the recombinant molecule show similar spectra at different pH values but are markedly different from that reported by Konno et al. (13) for a natural hirudin-variant. Our CD studies indicate the presence of about 60% beta sheet and the absence of alpha helix in the secondary structure of recombinant hirudin, in agreement with the conformation determined by NMR studies (17)

Physico-chemical properties of the rare-earth metals, scandium, and yttrium

1963 ◽  
Vol 79 (2) ◽  
pp. 263-293 ◽  
Author(s):  
E.M. Savitskii ◽  
V.F. Terekhova ◽  
O.P. Naumkin
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Chemical Properties ◽  
Physico Chemical ◽  
The Rare Earth

Physico chemical properties and gas adsorption separation characteristics of Itaya zeolite and its modified products.

1990 ◽  
Vol 39 (442) ◽  
pp. 996-1000 ◽  
Author(s):  
Ayao TAKASAKA ◽  
Hideyuki NEMOTO ◽  
Hirohiko KONO ◽  
Yoshihiro MATSUDA
Keyword(s):  
Gas Adsorption ◽  
Chemical Properties ◽  
Physico Chemical

Development of Ketchup from Sudanese Red karkade (Hibiscus sabdariffa L.) byproduct

Food Biology ◽  
1970 ◽  
pp. 19-23
Author(s):  
Nawal Abdel-Gayoum Abdel-Rahman
Keyword(s):  
Sensory Quality ◽  
Chemical Properties ◽  
Storage Period ◽  
Gum Arabic ◽  
Raw Material ◽  
Soluble Solids ◽  
Hibiscus Sabdariffa ◽  
Overall Acceptability ◽  
Physico Chemical ◽  
Tomato Ketchup

The aim of this study is to use of karkede (Hibiscus sabdariffa L.) byproduct as raw material to make ketchup instead of tomato. Ketchup is making of various pulps, but the best type made from tomatoes. Roselle having adequate amounts of macro and micro elements, and it is rich in source of anthocyanine. The ketchup made from pulped of waste of soaked karkede, and homogenized with starch, salt, sugar, ginger (Zingiber officinale), kusbara (Coriandrum sativum) and gum Arabic. Then processed and filled in glass bottles and stored at two different temperatures, ambient and refrigeration. The total solids, total soluble solids, pH, ash, total titratable acidity and vitamin C of ketchup were determined. As well as, total sugars, reducing sugars, colour density, and sodium chloride percentage were evaluated. The sensory quality of developed product was determined immediately and after processing, which included colour, taste, odour, consistency and overall acceptability. The suitability during storage included microbial growth, physico-chemical properties and sensory quality. The karkede ketchup was found free of contaminants throughout storage period at both storage temperatures. Physico-chemical properties were found to be significantly differences at p?0.05 level during storage. There were no differences between karkade ketchup and market tomato ketchup concerning odour, taste, odour, consistency and overall acceptability. These results are encouraging for use of roselle cycle as a raw material to make acceptable karkade ketchup.

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