Nitric Acid-activated Nteje Clay: Structural and Bleaching Properties

سال انتشار: 1392
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 615

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شناسه ملی سند علمی:

JR_IJE-26-5_008

تاریخ نمایه سازی: 17 خرداد 1393

چکیده مقاله:

The structural and bleaching properties of nitric acid-activated Nteje clay was studied to investigate its ability to serve as an alternative to the high cost imported bleaching earth. The clay was mined, sundried,grinded, and reacted with different concentrations of nitric acid, ranging from 2 mol.L-1 to 15mol.L-1. The un-activated and activated samples were characterized to study the structural effects of the activation process. The activated samples were employed in bleaching palm oil under controlled conditions of the process variables. The characterization results showed that the surface area, cationexchange capacity (CEC), and oil retention properties of the activated samples were affected by the activation reaction. The surface area increased to about 4 times (288.8 m2.g-1) the initial value (68.5 m2.g-1), while the CEC decreased from 154 to 65 meg.100-1g-1 with acid activation. The bleachingstudies revealed that the activated clay samples adsorbed color pigments from palm oil more than the un-treated clay sample, with the bleaching efficiency of the sample activated using 13 mol.L-1 HNO3 increased from 37.82 % to 89.76 %. This study has shown that nitric acid can be employed favourablyin activation of Nteje clay to improve its bleaching ability. It is also concluded that the activatedsamples can serve as an alternative to the imported bleaching earths

نویسندگان

r.o ajemba

Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Anambra, Nigeria

o.d onukwuli

Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Anambra, Nigeria