CATALYST TABLET OF Cu-TiO2/GRAPHITE FOR PHOTO-AND ELECTRO-ASSISTED DEGRADATION OF REMAZOL YELLOW FG.

7/9/13 Alchemy | Kimia FMIPA UNS

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CATALYST TABLET OF Cu-TiO2/GRAPHITE FOR PHOTO-AND ELECTRO-ASSISTED DEGRADATION OF REMAZOL YELLOW FG

Fitria Rahmawati , Rochmi I. Apriyani , Sentot B. Rahardjo Abstrak (en) :

Titanium dioxide (TiO₂) film was supported on graphite (G) by means of chemical bath deposition (CBD) from TiCl₄

precursor. Meanwhile surfactant cetyl trimethyl ammonium bromide (CTAB) was added as linking and assembling agent between titanium network and graphite substrate. Cu was deposited electrochemically from 0.4 M of CuSO4

solution at 0.03 A of electric current. The tablets of TiO₂/G and Cu-TiO₂/G were used as catalyst for photocatalytic degradation (PC), electrocatalytic degradation (ED) and photoelectrocatalytic (PEC) degradation of Remazol Yellow FG. In degradation system which used TiO2/G tablet, the highest rate constant, k, was achieved by PEC method, k

was 2.8´10-3 _min-1_{, as well as in the system which used Cu-TiO}

2/G tablet. However, this research founded that direct

oxidation by external electric field contribute more to degradation process than photocatalytic mechanism, proved by

high rate constant of ED, k was 2.6´10-3 min-1. Meanwhile, rate constant of photocatalytic degradation was 5´10-4 min-1. This research also founded that TiO₂ film highly contribute in degradation process due to the fact that rate

constant of electrodegradation by using blank graphite is low, k was 5´10-4 _min-1_{. Meanwhile, deposition of Cu onto}

TiO₂ did not enhance degradation rate of remazol yellow by PEC method, however it enhanced the rate constant of

ED to 2.7´10-3 min-1. The FTIR analysis to the completedly degraded remazol yellow FG solution shows disappearance of N=N stretching at 1559 cm-1_{and u}

as CH2 at 2919 cm-1. This indicates that molecular structure of

remazol yellow has been degraded succesfully then convert this dye solution into clear solution.

Abstrak (ina) :

-Keyword : Cu-TiO2/graphite, electrocatalytic degradation, photoelectrocatalytic degradation, remazol yellow FG, TiO2/Graphite

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