The as‐synthesized MCM‐41 and its modified forms are used as adsorbents for the removal of nonylphenol ethoxylate (NP‐10) from aqueous solutions. The partial template containing MCM‐41 is prepared by treating the as‐synthesized sample with ethanolic ammonium nitrate solution. Complete removal of the template is performed using the calcination process. The prepared adsorbents are characterized by X‐ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, transmission electron microscopy, and nitrogen physisorption techniques. The effect of adsorbent weight, pH, contact time, and initial concentration on the adsorption efficiency is studied. The equilibrium adsorption data are well defined, and they are fitted with Langmuir isotherm model. The maximum adsorption capacities (q_m) and pseudo‐second‐order rate constants (k₂) are calculated. The best adsorbent, in terms of removal efficiency, results to be the thermally treated MCM‐41, characterized by the highest surface area, and thus with the largest porosity. Specifically, the removal efficiency for NP‐10 is around 84% (558 mg g⁻¹) with an initial concentration of 700 mg L⁻¹, which is increased to 91% (455 mg g⁻¹) for a 500 mg L⁻¹ initial concentration. Thermodynamic studies depict that the adsorption of NP‐10 onto MCM‐41 is an endothermic process and the spontaneity is controlled by entropy.

中文翻译：

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使用MCM-41作为从水溶液中去除非离子表面活性剂的有效吸附剂

合成后的MCM-41及其修饰形式用作从水溶液中去除壬基酚乙氧基化物（NP-10）的吸附剂。含有MCM-41的部分模板是通过将合成后的样品用乙醇硝酸铵溶液处理而制备的。使用煅烧过程完全去除模板。制备的吸附剂通过X射线衍射，傅立叶变换红外光谱，热重分析，透射电子显微镜和氮物理吸附技术进行表征。研究了吸附剂重量，pH，接触时间和初始浓度对吸附效率的影响。平衡吸附数据定义明确，并符合Langmuir等温线模型。最大吸附容量（q_米）和伪二级速率常数（k ₂）被计算。就去除效率而言，最好的吸附剂是经过热处理的MCM-41，其特征是具有最大的表面积，因此具有最大的孔隙率。具体而言，NP-10的去除效率为84％（558毫克克^-1），用700毫克的L的初始浓度^-1，这是提高到91％（455毫克克^-1）为500毫克的L ^{- 1}初始浓度。热力学研究表明，NP-10在MCM-41上的吸附是一个吸热过程，自发性受熵控制。