In this work, two adsorbents were synthesized by loading lanthanum and iron ions on magnetized ETS‐4 titanosilicate. The sorbents were identified by Fourier‐transform infrared spectroscopy (FTIR), vibrating sample magnetometry (VSM), thermogravimetry, differential thermogravimetry (TG‐DTG), X‐ray diffraction (XRD), and Brunauer‐Emmette‐Teller techniques, and their adsorption performance for the sorption of fluoride was evaluated in a wide fluoride concentration range. The influence of various variables, including shaking time, fluoride concentration, pH, and temperature, on the uptake of fluoride was investigated. The maximal capacity of ETS‐4 impregnated with La and with Fe was 260.69 and 231.43 mg/g, respectively. The used sorbent was readily removed from the solution by using a magnet bar. The regenerated sorbent retained most of its capability after regeneration. The results of the kinetic study were described by a pseudosecond‐order model, indicating that the process was chemisorption in nature. The Freundlich isotherm well described the sorption data, which implied that the adsorption was multilayered and heterogeneous.

中文翻译：

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镧和铁修饰的可吸附氟化物的磁化ETS-4的合成与表征

在这项工作中，通过将镧和铁离子负载在磁化的ETS-4钛硅酸盐上来合成两种吸附剂。吸附剂通过傅立叶变换红外光谱（FTIR），振动样品磁力法（VSM），热重法，差示热重法（TG-DTG），X射线衍射（XRD）和Brunauer-Emmette-Teller技术进行鉴定，并对其吸附进行了鉴定在宽的氟化物浓度范围内评估了氟化物的吸附性能。研究了各种变量（包括振荡时间，氟化物浓度，pH和温度）对氟化物吸收的影响。La和Fe浸渍的ETS-4的最大容量分别为260.69和231.43 mg / g。使用磁棒可以很容易地从溶液中去除用过的吸附剂。再生后的吸附剂保留了其大部分功能。动力学研究的结果用伪二级模型描述，表明该过程是化学吸附。Freundlich等温线很好地描述了吸附数据，这表明吸附是多层的并且是非均质的。