ABSTRACT: Congo red is one of
dyes-stuff in textile industry wastwater. If it is thrown directly without
waste management process, the dyes could pollute environtment, especially soil.
Humin has OH phenolic and carboxylic functional group which can interacted with
congo red. The aim of this study is recognize humin characteristic from the
soil of Baturraden resin forest, determine the adsorption capacity and isotherm
adsorption pattern of congo red by humin from the soil of Baturraden resin
forest. Humin in this study is isolated from the soil of Baturraden resin forest.
soil cleared of gravel and dirt, then it extracted by using NaOH of nitrogen
atmosphere and purified to applies mixture HCl:HF. Humin that is obtained is
used to be interacted with dyes with various contact time, various of pH and
concentration of congo red so that the adsorption capacities and isotherm
adsorption pattern can be obtained. Result of the study showed that the humin
has water content 34.92 %, dust content 8.64 %, total acidity 475 cmol/Kg,
carboxylic rate 272.5 cmol/Kg, and OH Phenolic rate 202.5 cmol/Kg. The optimum
contact time of congo red adsorption by humin is 40 minutes, with optimum pH is
7, adsorption capacities 57.14 mg/g and isotherm adsorption pattern of congo
red by humin is follow the pattern of Langmuir isotherm adsorption.
Key word: congo red, humin,
adsorption
Penulis: Roy Andreas dan Tien
Setyaningtyas
Kode Jurnal: jpkimiadd080025
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