Adsorption is an effective method for treating wastewater containing nickel due to its minimal equipment requirements and flexible operation. Therefore, an environmental friendly, inexpensive, efficient and recyclable adsorbent is needed. In this work, a reusable dual-functional super-paramagnetic adsorbent was prepared by combining APTES (3-Aminopropyltriethoxysilane) and EDTA (ethylenediaminetetraacetic acid disodium) with magnetic diatomite for the removal of Ni²⁺. It is named diatomite/CoFe₂O₄@APTES-EDTA (DECFASEs). The synthetic material was characterized and studied by XRD (X-ray Powder Diffractometer), FTIR (Fourier Transform Infrared Spectrometer), SEM (Scanning Electron Microscope), TEM (Transmission Electron Microscope), EDS (Energy Dispersive Spectrometer), VSM (Vibrating-Sample Magnetometer), BET (Brunauer-Emmett-Teller) method, Zeta potential analyzer and XPS (X-ray Photoelectron Spectroscopy), respectively. The performance of adsorption Ni²⁺ by DECFASEs was studied on effect of pH, reaction time and initial concentrations. The adsorption and desorption capacity and recyclability of the adsorbent material were estimated. A adsorption kinetic data had a significant correlation with the pseudo second-order kinetic and also adsorption isotherm data corresponded well with Freundlich adsorption isotherm. The maximum adsorption capacity of the adsorbent material was 19.22 mg/g. The Ni²⁺ adsorption capacity of DECFASEs decreased slightly from 9.11 to 8.25 mg/g after 4 recycles. The XPS results of DECFASEs before and after Ni²⁺ uptake showed N and O participated in the complexation of Ni²⁺ in the adsorption process, which verified the chemical interaction between Ni²⁺ and DECFASEs. Modified-diatomite is a promising adsorbent for aqueous Ni²⁺ removal.

吸附是一种处理含镍废水的有效方法，因为它对设备的要求极低且操作灵活。因此，需要环保，廉价，有效和可回收的吸附剂。在这项工作中，通过将APTES（3-氨基丙基三乙氧基硅烷）和EDTA（乙二胺四乙酸二钠）与磁性硅藻土结合以制备Ni ²⁺，制备了可重复使用的双功能超顺磁性吸附剂。它被命名为硅藻土/ CoFe ₂ O _4。@ APTES-EDTA（减少）。通过XRD（X射线粉末衍射仪），FTIR（傅立叶变换红外光谱仪），SEM（扫描电子显微镜），TEM（透射电子显微镜），EDS（能量分散光谱仪），VSM（振动光谱仪）对合成材料进行了表征和研究。样品磁力计），BET（Brunauer-Emmett-Teller）方法，Zeta电位分析仪和XPS（X射线光电子能谱）。吸附Ni ²⁺的性能通过DECFASEs研究了pH，反应时间和初始浓度的影响。估计了吸附材料的吸附和解吸能力以及可回收性。吸附动力学数据与拟二阶动力学具有显着相关性，并且吸附等温线数据也与弗氏吸附等温线非常吻合。吸附材料的最大吸附容量为19.22mg / g。经过4次循环后，DECFASE的Ni ²⁺吸附容量从9.11略微降低至8.25 mg / g。Ni ²⁺吸收前后的DECFASEs XPS结果表明，N和O参与了Ni ²⁺的络合过程，证明了Ni ²⁺之间的化学相互作用。和DECFASEs。改性硅藻土是一种去除水中Ni ²⁺的有前途的吸附剂。