Ultrasound was applied simultaneous with adsorption process in most of the previous study. However, this method is not practical to treat huge amount 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 study 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.

在先前的大多数研究中，超声波是与吸附过程同时应用的。然而，这种方法对于处理大量有色废水是不切实际的。在这项研究中，在几种初始染料浓度（20-100 mg / L），接触时间（0.5-5 h）的条件下，超声预处理的花生壳粉在不同功率水平（1.5-3.5 W）下对染料的吸附效率），溶液的pH值（2-8）和剂量（0.1-0.3 g）进行了研究，并与超声同时吸附过程和对照进行了比较。在初始染料浓度为60 mg / L的条件下，间接超声预处理的花生壳粉的吸附效率分别比对照，超声同时吸附和直接超声预处理的样品分别提高了25.78％，13.64％和1.5％。间接超声预处理样品的温度为3。5 W在pH值为8的溶液中的最高吸附效率为89.96％，而在0.3 g剂量下3 h的吸附效率为94.83％。用扫描电子显微镜和表面表征分析仪表征了样品的表面特征和质构性质。结果表明，在超声预处理的样品上，随着功率水平的提高，产生了更多的多孔结构。