In this study, a new composite from silica coated MnFe₂O₄ nanoparticles, diethylenetriamine, 3-chloropropyl trimethoxysilane and Mg–Al Layered Double Hydroxide (Mg–Al LDH/DETA/CPTMS/SCNPs) composite was synthesized. The Mg–Al LDH/DETA/CPTMS/SCNPs composite was examined by Fourier transform infrared spectrometer (FT-IR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDS), X-ray diffraction (XRD), Thermogravimetric Analysis (TGA) and Vibrating Sample Magnetometry (VSM). The synthesized composite exhibited magnetic property with a saturation magnetization of 0.40 emu g⁻¹. The Mg–Al LDH/DETA/CPTMS/SCNPs composite was utilized as a successful adsorbent for removal of tetracycline from aqueous solutions. The effect of various operation factors such as initial drug concentration, adsorbent dosage, pH and contact time were investigated. The optimized variable conditions such as adsorbent dose of 60 mg L⁻¹, drug concentration of 100 mg L⁻¹, pH = 7 and contact time 30 min were obtained. For describing the adsorption isotherms, the Langmuir, Freundlich and Temkin adsorption models were utilized. The results indicated that the adsorption isotherm is in good agreement with Langmuir model. According to the Langmuir analysis, the maximum adsorption capacity (q_m) of the Mg–Al LDH/DETA/CPTMS/SCNPs composite for tetracycline was obtained to be 40.16 mg g⁻¹. The kinetic studies revealed that the adsorption in all cases to be a pseudo second-order process. The negative value of ΔG° and the positive value of ΔH° showed the adsorption process to be spontaneous and endothermic.

中文翻译：

---

改性二氧化硅包覆 MnFe2O4 纳米颗粒新型复合材料的合成和表征，用于去除水溶液中的四环素

在这项研究中，合成了一种由二氧化硅涂覆的MnFe ₂ O ₄纳米颗粒、二亚乙基三胺、3-氯丙基三甲氧基硅烷和Mg-Al层状双氢氧化物（Mg-Al LDH/DETA/CPTMS/SCNPs）复合材料组成的新型复合材料。通过傅里叶变换红外光谱仪 (FT-IR)、扫描电子显微镜 (SEM)、能量色散 X 射线 (EDS)、X 射线衍射 (XRD)、热重分析仪对 Mg-Al LDH/DETA/CPTMS/SCNPs 复合材料进行了检测分析 (TGA) 和振动样品磁力测定 (VSM)。合成的复合材料表现出饱和磁化强度为0.40 emu g ^-1的磁性。 Mg-Al LDH/DETA/CPTMS/SCNPs 复合材料被用作从水溶液中去除四环素的成功吸附剂。研究了各种操作因素如初始药物浓度、吸附剂用量、pH 值和接触时间的影响。得到了吸附剂用量60 mg L ^-1、药物浓度100 mg L ^-1 、pH = 7、接触时间30 min等优化变量条件。为了描述吸附等温线，使用了 Langmuir、Freundlich 和 Temkin 吸附模型。结果表明，吸附等温线与Langmuir模型吻合较好。根据Langmuir分析，Mg-Al LDH/DETA/CPTMS/SCNPs复合材料对四环素的最大吸附容量（q _m）为40.16 mg g ^-1。动力学研究表明，所有情况下的吸附都是伪二级过程。ΔG °为负值， ΔH °为正值表明吸附过程是自发吸热的。