PROCESS AND MATERIAL MADE BY ECOLOGICAL METHODS FOR CATALYTIC OXIDATION OF ORGANIC POLLUTANTS

The invention relates to a material with catalytic properties and to a process for preparing the same by using ecological methods, the material being meant to be used for the catalytic oxidation of pollutants of organic nature from aqueous solutions, at ambient temperature and atmospheric pressure in semi-continuous system. According to the invention, the material consists of a thin film containing nanoparticles of Ni oxide with the particle size ranging between 4...28 nm, the Ni oxide nanoparticles being phytosynthesized by using an alcoholic or hydroalcoholic extract prepared from leaves of Juglans regia L., by microwave-assisted extraction at a temperature ranging between 80...110°C, the extraction time being of 1...2 hours, at a plant material : solvent ratio ranging between 1 :5...1 : 20 and Ni nitrite hexahydrate having a concentration ranging between 2x 10-3 M and 1.5 M, in variable extract : solution ratios ranging between 4 : 1 and 1 : 4, the catalytic material showing an efficiency of 99% regarding the catalytic oxidation of organic pollutants, in a semi-continuous system, at ambient temperature and neutral pH values. The claimed preparation process is performed in two stages: in the first stage the phytosynthesized nanoparticles of Ni oxide are obtained and, in the second stage, said nanoparticles are deposited on glass plates, by the immersion deposition process, followed by the calcination thereof in an oven for 2...4 hours at a temperature ranging between 400...580°C. Invenţia se referă la un material cu proprietăţi catalitice şi la un procedeu de obţinere a acestuia prin metode ecologice, materialul fiind utilizat pentru oxidarea catalitică a poluanţilor de natură organică din soluţii apoase, la temperatură ambiantă şi presiune atmosferică în sistem semicontinuu. Materialul conform invenţiei este compus dintr-un film subţire conţinând nanoparticule de oxid de Ni cu dimensiunea particulelor cuprinsă între 4...28 nm, nanoparticulele de oxid de Ni fiind fitosintetizate folosind un extract alcoolic sau hidroalcoolic obţinut din frunze de Junglans regia L., prin extracţia asistată de microunde la o temperatură cuprinsă între 80...110°C, timpul de extracţie fiind de 1...2 ore, cu raportul material vegetal : solvent cuprins între 1 : 5...1 : 20 şi azotat de Ni hexahidrat având concentraţia cuprinsă între 2 x 10-3 M şi 1,5 M, în rapoarte variabile extract : soluţie cuprinse între 4 : 1 şi 1 : 4, materialul catalitic prezentând o eficienţă la oxidare