Browsing by Subject "adsorption capacity"
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Item Preparation of chitosan beads using tripolyphosphate and ethylene glycol diglycidyl ether as crosslinker for Cr(VI) adsorption(Publishing House of Lviv Polytechnic National University, 2016) Nitsae, Merpiseldin; Madjid, Armeida; Hakim, Lukman; Sabarudin, AkhmadA solid-phase material based on modified chitosan using tripolyphosphate (TPP) and ethylene glycol diglycidyl ether (EGDE) as a crosslinker has been prepared, and its ability in adsorbing Cr(VI) has been examined. In this work, a chitosan flake was shaped into beads using TPP, and its chemical stability was improved through reaction with EGDE as the crosslinker. Some parameters that may influence the product, such as composition and immersion time, were systematically studied to obtain the optimum conditions. The obtained material was characterized using SEM and FT-IR. The ability of the modified chitosan for the Cr(VI) adsorption was described by the adsorption capacity and kinetics study. The results showed that the modified chitosan has Cr(VI) adsorption capacity of 104.283 mg∙g-1 at pH = 3, and the adsorption follows the first-order rate, suggesting an ion-exchange mechanism which is responsible for this interaction. З використанням триполіфосфату (TПФ) та дігліциділового етеру етиленгліколю (ДГЕЕ) як зшиваючого агента приготовлено твердофазний матеріал на основі модифікованого хітозану. Досліджено його адсорбуючу здатність відносно хрому(VI). Показано, що за допомогою ТПФ пластівець хітозану може бути сформований в гранулу, а його хімічна стабільність покращується при використанні ДГЕЕ як зшиваючого агента. Для визначення оптимальних умов вивчено вплив таких чинників, як склад і час занурення. Характеристику отриманого продукту визначено за допомогою сканувального електронної мікроскопії та Фур‘є-спектроскопії. Здатність модифікованого хітозану адсорбувати Cr(VI) підтверджено результатами досліджень адсорбційної здатності і кінетичними дослідженнями. Визначено, що адсорбційна здатність модифікованого хітозану становить 104.283 мг/г при рН = 3, а адсорбція є реакцією першого порядку, яка припускає йонообмінний механізм.Item Static regulations of urea (carbamide) adsorption by wet and dried peat(Видавництво Львівської політехніки, 2023-02-28) Matsuska, Oksana; Sukhorska, Olga; Gumnitsky, Jaroslaw; Sabadash, Vira; Lviv Polytechnic National UniversityThe possibility and effectiveness of using a natural sorbent – peat from the Vereshchytsia-Yanivske deposit for treating agricultural wastewater with a high urea content – has been studied. The humidity and moisture content of the upland and lowland types of peat from this peatland were determined. Comparing these indicators made it possible to establish that the lowland peat has a significantly higher humidity and moisture content. The adsorption capacities of wet and dried types of peat for urea were studied and compared. The changes in urea concentration in aqueous solutions of the studied peat samples are presented by the corresponding curves. It was established that the lowland peat (dried samples) has higher sorption properties to urea when absorbed from the water environment than the upland type. In the adsorption of non-dried peat, curves were obtained, which show a gradual decrease in the concentration of urea in the solution, indicating the gradual filling of the active centres of peat with urea molecules. For pre-dried peat, rapid absorption of this pollutant is observed at the initial moments (approximately up to 10 minutes). The calculated maximum absorption capacities of dried peat species for urea show that the maximum absorption capacity of dry lowland peat is significantly higher than that of dry upland peat.