Abstract
<p>The heavy metal content is very dangerous because it can pollute the environment. One of the heavy metals waste commonly found in the textile industry is chromium (Cr). <em>Mimosa pudica</em> is a weed plant and its availability is very abundant. However, it also contains tannin which can be developed into tannin gel biosorbent to adsorption heavy metal content in the wastewater. The purpose of this research is to study <em>Mimosa pudica</em> tannin as a Cr biosorbent from textile wastewater. There are two steps to synthesis tannin gel biosorbent. They are the tannin extraction and the condensation polymerization process. Tannin is easily soluble in water so the condensation polymerization process is needed to make it insoluble in water. The extraction of <em>Mimosa pudica </em>tannin was done using water solvent. The condensation polymerization process was done by the reaction of tannin extract and formaldehyde. The Cr content of textile industry wastewater in the Pasar Kliwon, Surakarta was 4 ppm. The results of the biosorption of Cr heavy metal using <em>Mimosa pudica</em> tannin gel showed that the remaining Cr heavy metal was 0.7098 ppm. It was already below the threshold which was 1 ppm.</p><p> </p><p><strong>Keywords:</strong> biosorption, condensation polymerization, extraction, <em>Mimosa pudica</em>, tannin gel</p>
Highlights
Heavy metals are harmful to the environment
Materials and Methods Materials that were used in this study were the leaves and stems of Mimosa pudica plant, wastewater of the textile industry areas especially the screen printing industry located in Pasar Kliwon, Surakarta, nitric acid (HNO3 65% Merck, Germany), sodium hydroxide (NaOH 99% Merck, Germany), formaldehyde (CH2O 37,5%, Mallinckrodt chemicals, USA), potassium dichromate (K2Cr2O7 99,9% Merck, Germany)
Based on the results of research that has been done can be concluded as follows: 1. The condensation polymerization process aimed to strengthen the structure of tannin as a biosorbent so the biosorbent was not dissolved in water
Summary
Heavy metals are harmful to the environment. Several heavy metals are carcinogenic and if exposed to agricultural land will endanger life. Heavy metals can be accumulated in a cell of a plant which is animal and human food, they can be accumulated in a living organism. The effluent of the textile industry can be a contributor to heavy metals [1].
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