Membran tak simetri poliakrilonitril untuk penyingkiran malakit hijau daripada air sisa
Abstract
Malakit Hijau (MG) adalah pewarna yang mempunyai kumpulan amino, imino dan boleh bercampur dengan asid tak berwarna, seperti asid hidroklorik atau asid sulfurik. Pewarna ini umumnya digunakan pewarnaan dan percetakan batik, sutera, kulit dan kertas. Namun, ianya adalah toksik. Oleh itu, air sisa yang mempunyai MG perlu dirawat sebelum dilepaskan ke saliran. Kajian ini dijalankan adalah untuk menghasilkan membran tak simetri poliakrilonitril (PAN) untuk menyingkirkan MG dan seterusnya melakukan beberapa pencirian bagi memilih membran yang terbaik. Membran PAN dihasilkan menggunakan kaedah pisau tebaran dan penyongsangan fasa iaitu merendamkan membran dalam air suling bagi menghasilkan liang lalu membran dikeringkan. Beberapa pencirian fizikokimia telah dilakukan iaitu spektroskopi inframerah transformasi Fourier-pantulan penuh (ATR- FTIR), Mikroskopi Imbasan Elektron Medan Pancaran (FESEM), ujian ketelapan air suling dan ujian kapasiti air. Kajian ini telah berjaya menghasilkan membran PAN tak simetri yang dapat dibuktikan berdasarkan analisis FESEM ke atas keratan rentas membran. Pencirian FTIR juga membuktikan bahawa hanya berlaku interaksi fizikal antara membran PAN dan MG kerana kumpulan berfungsi sebelum dan selepas rawatan dengan MG adalah hampir sama. Berdasarkan ujian ketelapan juga diketahui bahawa membran yang mempunyai kepekatan yang tinggi menghasilkan liang yang sedikit. Bacaan konduktiviti yang direkod juga membuktikan membran PAN boleh digunakan untuk merawat air sisa yang mengandungi MG di mana peratusan penyingkiran bagi 10 ppm ialah 27.0 %, 20 ppm sebanyak 18.4 % dan 50 ppm sebanyak 41.3 %.
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