دراسة استعمال الكايتوسان المستخلص من قشور الروبيان كمادة لازالة بعض الملوثات من محلولها المائي == Studying using extracted chitosan from shrimp shell is excellent as for removing the pollutants from the water their solutions
Author name:
رسول عقيل عبد العظيم الخاقاني
Supervisor name:
منير عبود جاسم الطائي | علي حسين عبد الكريم العامري
General topic:
Agricultural sciences
Specific topic:
Food
Degree:
Master
University:
University Of Basrah - Faculty Of Agriculture
Language:
Arabic
University location:
Basrah
First pages:
31T1793 - p.pdf
Abstract:
The current study aimed to find simple, cheap and successful methods to remove copper (II), lead (II) iron (II) and zinc (II) from their solutions by using chitosan prepared from shrimp shell (Penaeus semisulcatus) via deacetylation of chitin during four hours with sodium hydroxide solution. The yield of chitosan was about 16.4%. Chitosan contained 6.7% moisture, 0.75 ash and 2.84 protein. Deacetylation degree for chitosan recorded (74,88%)Values of viscosity, density, molecular weight, refractive index and wave length of chitosan where(86.22 centipoise, 0.98 g/cm3, 852 k Da, 1.332 and 320 nm), respectively. Functional properties, fat binding and water holding, for the mentioned compound were estimated by using ten categories of commercial oils (sun flower, thyme, olive, almond, fenugreek, pumpkin, flax, parsley, saffron and sesame). High binding was recorded with pumpkin oil, 618% and low binding was with sesame oil 437.84%Capacity of chitosan to absorbe water was 628.96% After measuring the deflection of X - rays, three peaks were recorded, angles of incidence for two of them were at (2ɵ=10)°,(2ɵ=23)° and Sharp peak at (2ɵ=20 Diagram of thermogravimetric analysis of chitosan showed presence of three phases of pyrolysis, first at 300°C, second stage starts directly at 360°C. Optimum conditions of chitosan for adsorption and its ability for adsorption to remove Pb (II), Fe (II), Cu (II) and Zn (II) ions from water solutions were studied. Good results recorded at pH=7, while Fe (II) was adsorbed at pH=4, ability of adsorption increased with weight of adsorbent, also temperature influenced the adsorption process, good results recorded at 50°C. while zinc was at 40°C. Also found that time required to reach equilibrium was 30 min, except iron was 40 min agitation speed was 200 rpm /min, best concentration for adsorb studied metals was 1000 ppm. Destaning of methylene blue from its water solution was studied, and it was found thatIIadsorption influenced by several conditions. Results showed that best contact time, pH, concentration, temperature, and agitation speed was 30 min, 8, 100 ppm, 50°C, and 200 rpm/min, respectively. It was noticed that adsorption capacity increased with increasing the adsorbent material, so, the adsorption capacity and its percentage were 4.772 ppm and 95.458%, respectively. In addition, an experiment was carried out to treat tap water with chitosan, about 0.4 g, to remove heavy metals. Results showed that lead represented the highest efficient adsorption, 81.176%, while less adsorption was found for iron,16.326%. In the other side, when 0.6 g of chitosan was used, lead represented the highest adsorption percentage, 90.588% and the lowest percentage of adsorption found in iron 20.408% at pH=7.62. Also chitosan was added with amount 0.6 g at pH=6, as a result the percentage of the adsorption was (95.94, 91.30, 75.82 and 25.51) %, respectively for lead, copper, zinc and iron, respectively, and this indicates the possibility of using chitosan to removecontaminant metals.
