Penggunaan Larutan Ekstrak Etanol Dari Temulawak Sebagai Fotosensitizer Di Dalam Pemutihan (Pengelantangan) Pulp Dengan Penyinaran Lampu

Abstract

Etanol extract from temulawak can used as fotosensitizer in pulp bleaching with lamp irradiating, which is in this pulp bleaching obtained singlet oxygen. This singlet oxygen can degradate lignin in pulp so that pulp brightness increase significantly after pulp bleaching. The brightness increasing obtained in pulp bleaching with lamp irradiating with bleaching time 60 minute dan use etanol extract from temulawak as fotosensitizer which the brightness increasing is 4,23 %. Non lamp irradiating bleaching pulp cant increase brightness significantly. Brightness increasing which is obtained in this bleaching is 2,36 % in singlet oxygen generator not closed and 3,28 % in singlet oxygen generator closed. In bleaching with direct addition oxygen in bleaching reactor obtain brightness increase equal to 2,75 %. The cause increase of brightness in non lamp irradiating bleaching pulp and singlet oxygen generator not closed more than non lamp irradiating bleaching pulp and singlet oxygen generator closed is the existence of probability amount of foton which come into reactor is more in non lamp irradiating bleaching pulp and singlet oxygen generator not closed, so that amount of excited electron from fotosensitizer and singlet oxygen formed larger. While the cause of increase of brightness in bleaching with direct addition oxygen in bleaching reaktor is larger than non lamp irradiating bleaching pulp and singlet oxygen generator closed is triplet oxygen which oxydize pulp indirectly go to bleching reactor, but pass fotosensitizer solution particularly. So there is some of oxygen still in fotosensistizer solution and if oxygen go to bleaching pulp require some time more than compared with direct addition oxygen in bleaching reactor