Sains Malaysiana 42(9)(2013): 1293–1300

Boron Removal from Aqueous Solution Using Curcumin-impregnated Activated Carbon

(Penyingkiran Boron daripada Larutan Akuas Menggunakan Karbon Teraktif Terkandung Kurkumin)

Azhar Abdul Halim*, Nor Alia Roslan, Nor Shamsiah Yaacub & Mohd. Talib Latif

School of Environmental and Natural Resource Sciences, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, D.E. Malaysia

Diserahkan: 20 September 2012 / Diterima: 2 Februari 2013

ABSTRACT

This study was conducted to investigate the batch and fixed-bed adsorption properties of boron on curcumin-impregnated activated carbon (Cur-AC). The maximum boron removal was obtained at pH 5.5 and 120 min of contact time. Langmuir and Freundlich isotherm models were applied and it was determined that the experimental data conformed to both models. The Langmuir maximum adsorption capacities for Cur-AC (5.00 mg/g) and regenerated Cur-AC (3.61 mg/g) were obviously higher than the capacity for bare activated carbon (0.59 mg/g). Kinetic studies indicated the adsorption of boron conformed to the intra-particle model. The highest boron removal in fixed-bed column adsorption was achieved up to 99% for the first 5 min at an inlet concentration of 890 mg/L and a flow rate of 8.0 mL/min. Thomas and the Yoon-Nelson models gave better fit to the experimental data. Cur-AC can be reused after elution processes with slightly lower adsorption capacity.

Keywords: Adsorption; boron; curcumin; fixed bed column; turmeric

ABSTRAK

Kajian ini telah dijalankan untuk menentukan ciri-ciri penjerapan boron secara kelompok dan secara turus lapisan tetap terhadap karbon teraktif terubahsuai dengan kurkumin (Cur-AC). Penyingkiran maksimum boron telah diperoleh pada pH 5.5 dan masa sentuhan selama 120 min. Hasil kajian ini mendapati bahawa data uji kaji ini telah mematuhi kedua-dua model isoterma penjerapan Langmuir dan Freundlich. Kapasiti penjerapan maksimum Langmuir untuk Cur-AC (5.00 mg/g) dan Cur-AC regenerasi (3.61 mg/g) adalah lebih tinggi berbanding kapasiti penjerapan bagi karbon teraktif yang tidak diubah suai (0.59 mg/g). Kinetik kajian menunjukkan penjerapan boron mematuhi model intra-partikel. Penyingkiran boron secara turus penjerapan telah mencapai sehingga 99% untuk 5 min pertama (kepekatan influen 890 mg/L dan kadar aliran sebanyak 8.0 mL/min). Hasil kajian menunjukkan data uji kaji lebih mematuhi Model Thomas dan Yoon-Nelson dan Cur-AC boleh digunakan semula selepas proses regenerasi dengan kapasiti penjerapan yang lebih rendah.

Kata kunci: Boron; kunyit; kurkumin; penjerapan; turus lapisan tetap

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*Pengarang untuk surat-menyurat; e-mail: azharhalim@ukm.my