In this research, a novel adsorbent, nitrilotriacetic acid anhydride (NTAA) and 3‐aminopropyltriethoxysilane (APTES) modified Santa Barbara Amorphous materials (SBA‐15) as a mesoporous silica was synthesized and applied for the adsorption of cadmium solution. X‐ray diffraction, transmission electron microscopy, scanning electron microscopy, nitrogen adsorption–desorption isotherms and Fourier transform infrared analysis were used. The adsorption experiments were performed during batch system containing different concentrations of cadmium solution (60–120 mg/L) in pH range of 2–10, adsorbent dosage of 100–600 mg/L with contact time interval of 15–120 min. The maximum cadmium removal was achieved at pH 6 with 250 mg/L of adsorbent after 60 min. The proposed mechanisms for the removal and capture of Cd⁺² ions by adsorbent are electrostatic interactions and chelation. The equilibrium studies prove that the experimental data are compatible with the Langmuir isotherm model well with the maximum adsorption capacity of 500 mg/g. Kinetic and thermodynamic studies also indicate that pseudo‐second order kinetic model is the predominant model and the adsorption process is exothermic. This study reveals a high capability of novel nano‐adsorbent for the efficient removal of hazardous heavy metal cations and anions from wastewater.

中文翻译：

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通过胺和酸后功能化的圣塔芭芭拉无定形材料吸收镉阳离子；综合吸附研究

在这项研究中，合成了一种新型的吸附剂，次氮基三乙酸酐（NTAA）和3-氨基丙基三乙氧基硅烷（APTES）改性的圣巴巴拉无定形材料（SBA-15）作为中孔二氧化硅，并用于吸附镉溶液。使用了X射线衍射，透射电子显微镜，扫描电子显微镜，氮吸附-解吸等温线和傅立叶变换红外分析。吸附实验是在分批系统中进行的，该系统包含不同浓度的镉溶液（60–120 mg / L），pH范围为2–10，吸附剂剂量为100–600 mg / L，接触时间间隔为15–120分钟。60分钟后，在250 mg / L的吸附剂下，在pH 6时达到最大的镉去除率。拟议的去除和捕获Cd ^+2的机制吸附剂产生的离子是静电相互作用和螯合。平衡研究证明，实验数据与Langmuir等温模型完全兼容，最大吸附容量为500 mg / g。动力学和热力学研究还表明，伪二级动力学模型是主要模型，吸附过程是放热的。这项研究表明，新型纳米吸附剂具有高效去除废水中有害重金属阳离子和阴离子的能力。