Sains Malaysiana 44(4)(2015): 607–612

Decolorization and Mineralization of Batik Wastewater through Solar Photocatalytic Process

(Penyahwarnaan dan Penguraian Sisa Air Batik melalui Proses Fotopemangkinan Cahaya Matahari)

WAN FADHILAH KHALIK¹, LI-NGEE HO*², SOON-AN ONG¹, YEE-SHIAN WONG¹,

NIK ATHIRAH YUSOFF¹ & FAHMI RIDWAN¹

¹Water Research Group, School of Environmental Engineering,Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia

²School of Material Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia

Received: 26 September 2014/Accepted: 3 December 2014

ABSTRACT

In this study, the photocatalytic degradation of batik wastewater in the presence of zinc oxide (ZnO) as photocatalyst was investigated. The effect of various operating parameters, such as pH of batik wastewater, catalyst dosage and aeration on the photocatalytic degradation process, was examined. The mineralization of batik wastewater was also evaluated through chemical oxygen demand analysis. The decolorization of batik wastewater was enhanced at acidic conditions (pH3) which was 88.2% after 10 h irradiated under solar light, meanwhile its mineralization was 286 mg/L after 12 h irradiation time. The data obtained for photocatalytic degradation of batik wastewater was well fitted with the Langmuir-Hinshelwood kinetic model. It can be concluded that batik wastewater could be decolorized and mineralized under solar light irradiation with presence of ZnO.

Keywords: Batik wastewater; decolorization; mineralization; photocatalytic; zinc oxide

ABSTRAK

Di dalam kertas ini, degradasi sisa air batik oleh fotopemangkinan dengan kehadiran zink oksida sebagai fotopemangkin telah dikaji. Kesan daripada pelbagai parameter operasi, contohnya, pH sisa air batik, dos fotopemangkin dan pengudaraan ke atas proses fotopemangkinan telah dikaji. Penguraian sisa air batik juga dinilai melalui analisis permintaan oksigen kimia. Penyahwarnaan sisa air batik meningkat dalam keadaan berasid (pH3) iaitu 88.2% selepas 10 jam diradiasi di bawah cahaya matahari, sementara itu, penguraiannya ialah 286 mg/L selepas 12 jam masa penyinaran. Data yang diperoleh untuk degradasi fotopemangkinan sisa air batik adalah mengikut model kinetik Langmuir-Hinshelwood. Dapat disimpulkan bahawa sisa air batik boleh dinyahwarnakan dan diuraikan di bawah penyinaran cahaya matahari dengan kehadiran zink oksida.

Kata kunci: Fotopemangkinan; penguraian; penyahwarnaan; sisa air batik; zink oksida

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*Corresponding author; email: lnho@unimap.edu.my