ABSTRACT

This study proposes the use of an ultrasound-assisted adsorption system coupled to porous ceramic fragments to improve the removal of iron from FeSO₄ aqueous solution. Ultrasound was applied using an ultrasound bath at a low frequency (37 kHz, 330 W). The optimized conditions for Fe removal were achieved by 7 g of adsorbent, 40 min of sonication, 20 mg L^–1 of initial Fe concentration, and 30 °C of reaction temperature. After optimizing the conditions, the method was applied for the removal of iron in groundwater. A central composite design and response surface methodology were used to evaluate the degree to which different variables had a significant effect on iron removal. The efficiency of iron removal using the selected conditions for FeSO₄ solution was near to 100%. However, for groundwater samples, the maximum iron removal efficiencies of the system with and without ultrasound were 80.7% and 51.1%, respectively, indicating that the adsorption with ultrasound was significantly higher than that without ultrasound. It was shown that the proposed ultrasound-assisted adsorption system can be used to enhance the removal of inorganic iron from groundwater.

摘要

_{本研究建议使用与多孔陶瓷碎片耦合的超声辅助吸附系统来改善 FeSO 4}水溶液中铁的去除。使用超声波浴以低频（37 kHz，330 W）施加超声波。通过 7 g 吸附剂、40 min 超声处理、20 mg L ^-1初始 Fe 浓度和 30 °C 反应温度实现了 Fe 去除的优化条件。优化条件后，将该方法应用于地下水中铁的去除。中心复合设计和响应面方法用于评估不同变量对除铁产生显着影响的程度。_{使用选定的 FeSO 4}条件的除铁效率溶液接近 100%。然而，对于地下水样品，有和没有超声波的系统的最大除铁效率分别为80.7%和51.1%，表明有超声波的吸附明显高于没有超声波的吸附。结果表明，所提出的超声辅助吸附系统可用于增强从地下水中去除无机铁。