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pigments
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Extraction of Pigment from Walnut Husk by Supercritical CO2
, M.Sc. Thesis Sharif University of Technology ; Goodarznia, Iraj (Supervisor) ; Molaei Dehkordi, Asghar (Supervisor)
Abstract
Juglone is a naphthoquinone compound which is found in all parts of a walnut tree; including the leaf, root, walnut green husk, and bark. It is mostly used in dyeing industries. In this study, Juglone pigment is extracted from walnut husk by using the supercritical CO2 and Ethanol as a co-solvent, and the effects of parameters such as temperature, pressure, and size of husk particles on extraction efficiency are studied. The experiments have been designed based on Taguchi algorithm. Temperature and pressure range are chosen to be 35-50°C and 90-150 bar respectively. Walnut husk particles have been prepared dry from the city of Torbat Heidarieh in different average diameters; 1500, 855, 605...
Methylene Blue Removal from Contaminated Water by using Graphene Nano-Palte
, M.Sc. Thesis Sharif University of Technology ; Shayegan, Jalaleddin (Supervisor)
Abstract
Organic dye couldn’t be treated by conventional method (biological method) due to their durable structure. In recent years, graphene based adsorbent has become more popular; this is because of high specific surface area and presence of numerous functional group on its surface. Due to the widespread application of organic dye in different industry especially in textile industry, stability and toxicity nature of them, finding an appropriate and cost effective method in treatment of this pollutant is very important. In this study, preparing and characterization of 3-D gel magnetic graphene oxide/kappa carrageenan was conducted and its ability of dye adsorption was tested. For this purpose, at...