Photocatalytic degradation of acetamiprid

Pesticidi su toksične kemijske tvari ili mješavine tvari ili bioloških sredstava koje se namjerno otpuštaju u okoliš kako bi se spriječile, kontrolirale i/ili ubijale populacije štetnika. Otpornost pesticida na biološku, kemijsku i fotolitičku razgradnju uzrokuje njihovu akumulaciju s neželjenim posljedicama u okolišu. Cilj ovog istraživanja je razvoj fotokatalizatora za fotorazgradnju modelne komponente insekticida. Kao modelna komponenta korišten je insekticid acetamiprid (C10H11ClN4), koji je sastavna komponenta proizvoda Mospilan (Genera) s udjelom od 20 %. Istraživanje je provedeno u anularnom kotlastom reaktoru s recirkulacijom reakcijske smjese primjenjujući imobilizirani i suspendirani oblik fotokatalizatora (TiO2). Ispitan je utjecaj različitih rekacijskih uvjeta, kao što su koncentracija katalizatora u suspenziji, masa imobiliziranog sloja na nosaču, izvedba katalizatora, utjecaj H2O2 te tipa UV-lampe na fotolitičku i fotokatalitičku razgradnju acetamiprida. Učinkovitost fotolitičke i fotokatalitičke reakcije razgradnje praćena je određivanjem promjene koncentracije acetamiprida. Istraživanje obuhvaća pripremu fotokatalizatora u imobiliziranom i suspendiranom obliku, gdje se fotokatalizator prethodno tretira UV-C lampom. Za pripremu fotokatalitičkog sloja metodom imobilizacije korišteno je stakleno platno kao nosač, a peroksititanatna kiselina kao vezivo. Provedena je usporedba fotolitičke i fotokatalitičke razgradnje acetamiprida pri različitim reakcijskim uvjetima te su izvedeni zaključci o učinkovitosti procesa. Predložen je kinetički model i model reaktora, provedena je ocjena prihvatljivosti modela te su procijenjeni parametri modela. Nađeno je da fotolitičkom reakcijom dolazi do razgradnje acetamiprida uz primjenu zračenja visoke energije (UV-C lampa), dok primjenom simuliranog Sunčevog zračenja i UV-A lampe dolazi do neznatne razgradnje acetamiprida. Fotokatalička razgradnja acetamiprida u uvjetima simuliranog Sunčevog zračenja učinkovitija je u fotoreaktoru s imobiliziranim slojem fotokatalizatora.Pesticides are toxic chemical substances or mixtures of substances or biological agents deliberately released into the environment to prevent, control and / or kill pest populations. The resistance of pesticides to biological, chemical and photolytic degradation causes their accumulation with unwanted environmental impacts. The aim of this study is the development of photocatalysts for photodegradation of the model component of insecticide. As a model component, insecticide acetamiprid (C10H11ClN4) was used, which is a constituent of the Mospilan (Genera) component with a mass fraction of 20 %. The research was conducted in an annealed boiler reactor with recirculation of the reaction mixture using an immobilized and suspended form of photocatalyst (TiO2). The influence of different reaction conditions, such as concentration of catalyst in suspension, mass of immobilized layer on carrier, catalyst performance, H2O2 influence and UV lamp type on the photolytic and photocatalytic degradation of acetamiprid was investigated. The efficacy of photolytic and photocatalytic degradation reactions was monitored by determining the change in acetamiprid concentration. The research involves the preparation of photocatalysts in immobilized and suspended form, where the photocatalyst is previously treated with a UV-C lamp. To prepare the photocatalytic layer by the immobilization method, a glass canvas was used as a carrier and peroxytitanic acid as a binder. A comparison of photolytic and photocatalytic degradation of acetamiprides was carried out under different reaction conditions and conclusions were drawn on the efficiency of the process. A kinetic model and reactor model was proposed, the model's eligibility rating was performed and the model parameters were estimated. It has been found that the photolytic reaction causes acetamiprid degradation with the application of high energy radiation (UV-C lamp), while using the simulated solar radiation and the UV-A lamp there is a slight degradation of acetamiprid. The photocatalytic degradation of acetamiprid in conditions simulated by Solar radiation is more effective in a photoreactor with an immobilized photocatalyst layer