In this study, a novel adsorbent was designed and synthesized via intercalation of sodium dodecyl sulfate (SDS) in the interlayer, and subsequent grafting of acrylamide (AM) on the layer of layered double hydroxides (LDH) (named as AM/SDS-LDH), and applied for congo red (CR) removal. The morphological structure, wettability and physicochemical properties of the adsorbents were thoroughly characterized using SEM, EDS, N₂-adsorption/desorption isotherm, static contact angle, XRD and FTIR. Results elucidated that SDS and AM were successfully introduced into the interlayer and onto the layer of LDH, respectively. Adsorption experimental results suggested that the maximum adsorption capacities of CR on SDS-LDH and AM/SDS-LDH at pH 5.0 and 293 K were 714.29 and 1118.78 mg/g, respectively, which were much higher than that of CR on LDH (588.24 mg/g). Based on the BET, XRD and FTIR analysis, the higher adsorption capacity of AM/SDS-LDH was mainly attributed to high surface area, large basal spacing as well as the abundant NH₂ groups. The experimental data can be well fitted by pseudo-second-order kinetic and Langmuir isotherm models. Thermodynamic parameters indicated the adsorption process was favorable under the higher temperature condition. The synergistic effect existed during the adsorption process of CR onto AM/SDS-LDH, including the electrostatic interactions, anion exchange and hydrophobic-hydrophobic interactions. Overall, this study provided a strategy for design and fabrication of highly efficient adsorbents.

在这项研究中，通过在中间层中插入十二烷基硫酸钠（SDS），然后将丙烯酰胺（AM）接枝到层状双氢氧化物（LDH）层上（命名为AM / SDS-LDH），设计并合成了一种新型吸附剂），并申请移除刚果红（CR）。用SEM，EDS，N ₂彻底表征了吸附剂的形态结构，润湿性和理化性质。-吸附/解吸等温线，静态接触角，XRD和FTIR。结果表明，SDS和AM分别成功引入了中间层和LDH层。吸附实验结果表明，在pH 5.0和293 K下，CR对SDS-LDH和AM / SDS-LDH的最大吸附容量分别为714.29和1118.78 mg / g，远高于对LDH的CR（588.24 mg / g）。 /G）。根据BET，XRD和FTIR分析，AM / SDS-LDH的较高吸附容量主要归因于高表面积，大基距和丰富的NH _2。组。实验数据可以通过拟二阶动力学模型和Langmuir等温线模型很好地拟合。热力学参数表明在较高温度条件下吸附过程是有利的。CR在AM / SDS-LDH上的吸附过程中存在协同作用，包括静电相互作用，阴离子交换和疏水-疏水相互作用。总的来说，这项研究为高效吸附剂的设计和制造提供了一种策略。