Usol Ghafli, Nurul Azwin
(2014)
Copper-Tannate Complexes As Antifoulant In Antifouling Paint For Fish-Cage Nets.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
Tannin extracted from mangrove bark, Rhizophora apiculata (R. apiculata) was used
as a natural-origin source to be complexed with copper(U) salt. The copper-tannate
(Cu-T) produced was used as an antifoulant in antifouling paint. Mangrove bark was
extracted using 70% (v/v) aqueous acetone and gives 31.1 % extraction yield. The
total phenolic content (TPC) of mangrove tannin extract (MT) was 186.0 mg gallic
acid equivalent per gram sample, total flavonoid content (TFC) was 96.0 mg catechin
equivalent per gram sample and condensed tannin content (CTC) was 95.5% weight
content. The optimum condition of copper-tannate complexes (Cu-T) was studied
using precipitation curve on varies parameters which were copper dosage, reaction
temperature, reaction time and pH of Cu-T solution. The optimum conditions were
taking into account of Cu-T percentage yield and IR spectrum analysis. Three
derivatives ofCu-T at different pH, which were Cu-T pH 3.5, Cu-T pH 5.0 and Cu-T
pH 8.0, were chosen for further analysis. The concentration of copper element in CuT
and commercialized antifoulant, Cu-Oma was measured using AAS analysis and
shown that Cu-T complexes had lower amount of copper content which are almost
50% lower than Cu-Oma.
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