Department of Chemical and Petroleum Engineering, Faculty of Engineering, Technology and Built Environment, UCSI University, 56000 Cheras, Kuala Lumpur, Malaysia.
Department of Chemical and Petroleum Engineering, Faculty of Engineering, Technology and Built Environment, UCSI University, 56000 Cheras, Kuala Lumpur, Malaysia.
Ultrason Sonochem. 2018 Nov;48:64-70. doi: 10.1016/j.ultsonch.2018.05.024. Epub 2018 May 19.
Ultrasound was applied simultaneously with adsorption process in most of the previous studies. However, this method is not practical to treat huge amounts of coloured wastewater effluent. In this study, the efficiency of ultrasound pre-treated peanut husk powder at different power levels (1.5-3.5 W) in dye adsorption with several conditions of initial dye concentration (20-100 mg/L), contact time (0.5-5 h), solution pH (2-8), and dosage (0.1-0.3 g) was studied and compared with ultrasound simultaneous adsorption process and the control. Adsorption efficiency of indirect ultrasound pre-treated peanut husk powder has increased 25.78%, 13.64% and 1.5% compared with the control, ultrasound simultaneous adsorption and direct ultrasound pre-treated sample respectively at 60 mg/L of initial dye concentration. Indirect ultrasound pre-treated sample at 3.5 W has achieved the highest adsorption efficiency of 89.96% at solution pH 8 and 94.83% at 0.3 g dose for 3 h. The surface feature and textural properties of samples were characterized by using scanning electron microscopy and surface characterization analyser. The result indicated that more porous structure was created on the ultrasound pre-treated sample at increasing power levels.
在之前的大多数研究中，超声都与吸附过程同时进行。然而，这种方法对于处理大量有色废水来说并不实用。在本研究中，研究了不同功率水平（1.5-3.5 W）下超声预处理花生壳粉在不同初始染料浓度（20-100 mg/L）、接触时间（0.5-5 h）、溶液 pH 值（2-8）和剂量（0.1-0.3 g）条件下的染料吸附效率，并与超声同时吸附过程和对照进行了比较。与对照、超声同时吸附和直接超声预处理样品相比，在 60 mg/L 初始染料浓度下，间接超声预处理花生壳粉的吸附效率分别提高了 25.78%、13.64%和 1.5%。在溶液 pH 值为 8 和剂量为 0.3 g 时，3.5 W 下的间接超声预处理样品在 3 h 内达到了最高的吸附效率 89.96%和 94.83%。通过扫描电子显微镜和表面特性分析仪对样品的表面特征和结构特性进行了表征。结果表明，随着功率水平的增加，超声预处理样品上形成了更多的多孔结构。
