SENG OKSIDA (ZnO) SERAGAI BIOKATALIS PADA PROSES DEGRADASI SENYAWA BIRU METILEN

Darajat, Syukri and Aziz, Hermansyah and Alif , Admin (2008) SENG OKSIDA (ZnO) SERAGAI BIOKATALIS PADA PROSES DEGRADASI SENYAWA BIRU METILEN. Jurnal Riset Kimia . ISSN 1978-628X

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Abstract

A research aimed to study the influence of ZnO white powder on photodegridation of methylene blue using Merkuri larnp (λ = 365 nm) as light source have been reached. A suspension of ZnO (40 mg) mixed with 25 rnL of methylene blue solution (initial concentration of 0.015 mM) then was illurninated for 60 minutes showed degrradation and quantum yield amounting 23,84% and 3,55 molecules photon-1, respectively. These results mean that by using ZnO as photocatalyst there is about four times efficiency than the one without ZnO either in case of time consumed or the number of photon applied. In kinetic study, it has been observed that such semiconductor-catalyzed photochemical reaction obeys the first order rule where rate constant and half time consecutively were 0.0029 minute-1 and 231 minutes.

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