SEPARATION OF CHROM (VI) FROM ELECTROPLATING WASTE USING POLYMER INCLUSION MEMBRANE (PIM) METHOD

Abstract

<p><span lang="EN-US">Research of chromium (VI) separation has been done using </span><span lang="EN-US">p</span><span lang="EN-US">olymer </span><span lang="EN-US">i</span><span lang="EN-US">nclusion </span><span lang="EN-US">m</span><span lang="EN-US">embrane (PIM) method. This study aims to generate PIM, separate the metal ion chromium (VI) using PIM and determine the effect of the concentration of the feed phase, the thickness of the membrane and the amount of usage of the membrane for ion chromium (VI) diffusion.</span><span lang="EN-US">Polymer </span><span lang="EN-US">i</span><span lang="EN-US">nclusion </span><span lang="EN-US">m</span><span lang="EN-US">embrane (PIM) was made by mixing Aliquat 336-TBP as carrier compounds, PVC as the base polymer, DBE as a plasticizer and THF as a solvent. PIM membrane was placed between the source of analyte as a feed phase and result of the separation as a receiver phase. Feed phase was electroplating waste metal containing chromium (VI) at pH 4, while the receiver phase was a 2 N NaCl solution with a pH 6.7. </span>The change of v<span lang="EN-US">ariable</span>s<span lang="EN-US"> in this study </span>were<span lang="EN-US"> the concentration of the feed phase </span>at various dilution i.e.,<span lang="EN-US"> 100x, 50x and 10x, the thickness of the membrane i.e., 25 μm, 20 μm and 10 μm</span>,<span lang="EN-US"> and the </span>time of <span lang="EN-US">membrane</span> using i.e.,<span lang="EN-US"> 1, 2 and 3 times. The concentration of chromium (VI) diffused after separation process </span>was<span lang="EN-US"> analyzed </span>by <span lang="EN-US">a</span><span lang="EN-US">tomic </span><span lang="EN-US">a</span><span lang="EN-US">bsorption </span><span lang="EN-US">s</span><span lang="EN-US">pectroscopy (AAS). </span>T<span lang="EN-US">he stability of membrane was observed </span>by analyzing the presence of<span lang="EN-US"> membrane</span>’s<span lang="EN-US"> component </span>in the<span lang="EN-US"> feed</span> phase<span lang="EN-US"> and </span>in the <span lang="EN-US">receiver phase</span>. The analysis was conducted by UV-Vis <span lang="EN-US">spectrophotometry</span>. Meanwhile, s<span lang="EN-US">canning </span><span lang="EN-US">e</span><span lang="EN-US">lectron </span><span lang="EN-US">m</span><span lang="EN-US">icroscopy (SEM) </span>analysis was used <span lang="EN-US">to determine the morphology of membrane surface.</span><span lang="EN-US">The results showed that the chromium ion concentration </span>diffused<span lang="EN-US"> from the feed phase was 99.24</span><span lang="EN-US">%</span>, mean<span lang="EN-US">while the 85.88</span><span lang="EN-US">%</span> of it diffused to the receiving phase<span lang="EN-US">. The highest Cr(VI)</span> ions<span lang="EN-US"> diffus</span>ion was occured at<span lang="EN-US"> the first use of PIM membrane with a thickness of 10 μm and the concentration of the feed phase</span> was<span lang="EN-US"> 10.55 ppm</span> (resulted from 100 times dilution)<span lang="EN-US">. </span>Therefore, i<span lang="EN-US">t can be concluded that the diffusion of chromium (VI) ion was influenced by the concentration of feed phase, the thickness of membrane and </span>the number of membrane application<span lang="EN-US">.</span></p>