In this study, gold-magnetic nanocomposite in the presence of ultrasound wave assisted was synthesized and loaded on activated carbon (Au-Fe₃O₄-NCs-AC) by simple, fast and low-cost process. This novel material was applied for ultrasound assisted adsorption of congo red (CR) as model of toxic and even carcinogenic substance from aqueous solution. The detail of morphology and identity of Au-Fe₃O₄-AC was characterized by SEM and TEM techniques and correlation among response to variables such as pH (2-10), adsorbent mass (0.005-0.025 g), initial CR concentration (10-30 mg L^-1) and ultrasound time (2-6 min) was investigated by response surface methodology (RSM) under central composite design (CCD). Analysis of variance (ANOVA) exhibit a high R² value of 0.999 and confirm suitability of constructed second-order regression model for excellent evaluation and prediction of the experimental data. The interaction and main factor and optimum conditions of the under study process were determined from response surface plots based on desirability function. The maximum CR adsorption were achieved at pH of 4, 15 mg L^-1 of CR, 0.017 g of Au-Fe₃O₄-AC and 5 min sonication which owing to 99.49 % removal efficiency is highly recommended for future CR removal from different matrixes. Adsorption kinetic follow second-order rate expression in combination to inter particle diffusion and equilibrium adsorption data best represented by the Langmuir isotherm with maximum mono-layer adsorption capacity of 43.88 mg g^-1.

在这项研究中，合成了金磁纳米复合材料，并通过简单，快速和低成本的方法将其负载在活性炭（Au-Fe ₃ O ₄ -NCs-AC）上，并在超声波辅助下进行了制备。这种新型材料被用于超声辅助吸附刚果红（CR），作为水溶液中有毒甚至致癌物质的模型。通过SEM和TEM技术表征了Au-Fe ₃ O ₄ -AC的形貌和身份细节，以及对诸如pH（2-10），吸附剂质量（0.005-0.025 g），初始CR浓度（ 10-30毫克L ^-1）和超声时间（2-6分钟）在中央复合设计（CCD）下通过响应面方法（RSM）进行了研究。方差分析（ANOVA）表现出0.999的高R ²值，并证实了所构建的二阶回归模型对实验数据的出色评估和预测的适用性。根据期望函数从响应面图确定研究过程中的相互作用，主要因素和最佳条件。在pH为4、15 mg L ^-1的CR，0.017 g Au-Fe ₃ O _4的pH值下实现了最大的CR吸附。强烈建议采用-AC和5分钟的超声处理，以达到99.49％的去除效率，以便将来从不同基质中去除CR。吸附动力学遵循二级速率表达式，结合了粒子间扩散和平衡吸附数据，最好用Langmuir等温线表示，最大单层吸附容量为43.88 mg g ^-1。