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文章采用分步合成法制备了磁性吸附剂Fe3O4@SiO2-NH2，通过红外光谱仪(IR)、X射线光电子能谱仪(XPS)、振动样品磁强计(VSM)和扫描电子显微镜(SEM)对其进行了表征，同时研究了pH值、吸附时间、初始浓度和温度对Fe3O4@SiO2-NH2吸附特性的影响。结果表明：当温度为25℃、pH值为5.16、投加量为0.01 g、吸附时间为50 min时，Fe3O4@SiO2-NH2对Cd2+的吸附量为173.91 mg/g;Fe3O4@SiO2-NH2对Cd2+的吸附属于化学吸附，准二级动力学模型能较好地拟合吸附动力学行为；Langmuir等温吸附模型能较好地描述Fe3O4@SiO2-NH2对Cd2+的吸附过程，基于Langmuir等温吸附模型计算获得的吸附量为175.43 mg/g，与试验测定值接近。热力学数据表明，Fe3O4@SiO2-NH2对Cd2+的吸附是自发且吸热的过程。
Abstract：The magnetic adsorbent Fe3O4@SiO2-NH2 was prepared using step-by-step synthesis method in the liquid phase. The prepared adsorbent Fe3O4@SiO2-NH2 was characterized by infrared spectrometer(IR), X-ray photoelectron spectroscopy(XPS), vibrating sample magnetometry(VSM), and scanning electron microscopy(SEM). Simultaneously, the effects of pH value, adsorption time, initial concentration, and temperature on the adsorption performance of Fe3O4@SiO2-NH2 were studied. The results showed that at a temperature of 25 ℃, pH of 5.16, Fe3O4@SiO2-NH2 dosage of 0.01 g, and adsorption time of 50 minutes, the adsorption capacity of Fe3O4@SiO2-NH2 for Cd2+ was 173.91 mg/g. The adsorption of Fe3O4@SiO2-NH2 for Cd2+ was chemisorption.The Langmuir isotherm adsorption model better described the adsorption process of Fe3O4@SiO2-NH2 for Cd2+.The adsorption capacity calculated by the Langmuir isotherm adsorption model was 175.43 mg/g, which was close to the experimental measurement value. Thermodynamic data indicated that the adsorption of Fe3O4@SiO2-NH2 for Cd2+ was a spontaneous and endothermic process.
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基本信息:
DOI：10.16026/j.cnki.iea.2024050394
中图分类号:X703;TQ424
引用信息:
[1]刘永侠,焦朋朋,王晴等.磁性吸附剂Fe_3O_4@SiO_2-NH_2的制备及其对Cd~(2+)的吸附性能研究[J].离子交换与吸附,2024,40(05):394-403.DOI:10.16026/j.cnki.iea.2024050394.
基金信息:
山东省自然科学基金项目(基金号ZR2021MD004); 山东省高校青创科技计划资助项目(项目号2021KJ063); 枣庄学博士科研启动基金(基金号1020705)