Сорбційне вилучення катіонів цезію гібридним матеріалом на основі ZIF-8 та фероціаніду міді з водного середовища

• Дата: 2026
• Автори: Roik, N.V., Ischenko, M.V., Roik, О.S., Sharanda, L.F., Trofymchuk, І.М., Gorbyk, P.P.
• Формат: Стаття
• Мова: Українська
• Опубліковано: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2026
• Теми: катіони цезію; цеолітна імідазолятна структура; фероціанід міді; селективна сорбція; сорбційні параметри
• Онлайн доступ: https://www.cpts.com.ua/index.php/cpts/article/view/873
• Назва журналу: Chemistry, Physics and Technology of Surface

Concentration and removal of heavy metal ions and radioactive isotopes from multicomponent aqueous solutions remain an urgent task today due to the danger of anthropogenic pollution of the environment. The aim of the work was to create an effective sorbent based on an organometallic zeolitic imidazolate carrier and copper hexacyanoferrate possessing high kinetic and sorption parameters as well as selectivity towards cesium cations. The synthesis of the Zn-containing zeolitic imidazolate structure ZIF-8, subsequent partial substitution of Zn2+ by Cu2+, and formation of hexacyanoferrate crystal lattice were carried out in an aqueous medium at room temperature. The crystalline and porous structure of synthesized materials was investigated using X-ray diffraction analysis and low-temperature nitrogen adsorption-desorption, respectively. Obtained results confirm formation of ZIF-8 material with typical sodalite topology, high specific surface area, large total pore volume, and homogeneous microporous structure. It was proven that the interaction of the synthesized ZIF-8 with copper nitrate and subsequent modification with potassium hexacyanoferrate(II) leads to the formation of face-centered cubic crystalline structure. The study of sorption efficiency of synthesized hybrid material towards cesium cations was carried out in static mode depending on the acidity of medium, duration of contact, equilibrium concentration of adsorbate and presence of other cations in aqueous solution. It was found that the value of cesium cations sorption remains constant in the pH range from 6 to 9. The experimentally obtained results of equilibrium sorption studies were analyzed using kinetic (Lagergren and Ho-McKay) and isothermal (Langmuir and Freundlich) models. It was found that cesium cations sorption is described by pseudo-second-order kinetic model, according to which the interaction of adsorbate with surface centers of hybrid sorbent occurs quite quickly and diffusion is the main limiting factor of this process. It was proven that the equilibrium sorption of cesium cations is consistent with the Freundlich model, which describes the interaction of adsorbate with energetically nonequivalent surface sites of adsorbent. It was found that hybrid organometallic-coordinational material is capable of Cs+ selective removal from aqueous solutions containing excess amounts of Na+, K+ or Ca2+. The obtained results may be useful in the creation of new sorption materials for water purification from Cs+.