磁性吸附剂Fe_(3)O_(4)@SiO_(2)-NH_(2)的制备及其对Cd^(2+)的吸附性能研究  

The Preparation of the Magnetic Adsorbent Fe_(3)O_(4)@SiO_(2)-NH_(2)and Its Adsorption Performance on Cd^(2+)

作　　者：刘永侠 焦朋朋 王晴 杨丹 于晓娜 姜东良 王盛谕 吴昊 LIU Yong-xia;JIAO Peng-peng;WANG Qing;YANG Dan;YU Xiao-na;JIANG Dong-liang;WANG Sheng-yu;WU Hao(School of City and Architecture Engineering,Zaozhuang University,Zaozhuang 277160,China)

机构地区：[1]枣庄学院城市与建筑工程学院,枣庄277160

出　　处：《离子交换与吸附》2024年第5期394-403,I0002,共11页Ion Exchange and Adsorption

基　　金：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)。

摘　　要：文章采用分步合成法制备了磁性吸附剂Fe_(3)O_(4)@SiO_(2)-NH_(2),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Fe_(3)O_(4)@SiO_(2)-NH_(2)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,Fe_(3)O_(4)@SiO_(2)-NH_(2)对Cd^(2+)的吸附量为173.91 mg/g;Fe_(3)O_(4)@SiO_(2)-NH_(2)对Cd^(2+)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Fe_(3)O_(4)@SiO_(2)-NH_(2)对Cd^(2+)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,Fe_(3)O_(4)@SiO_(2)-NH_(2)对Cd^(2+)的吸附是自发且吸热的过程。The magnetic adsorbent Fe_(3)O_(4)@SiO_(2)-NH_(2)was prepared using step-by-step synthesis method in the liquid phase.The prepared adsorbent Fe_(3)O_(4)@SiO_(2)-NH_(2)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 Fe_(3)O_(4)@SiO_(2)-NH_(2)were studied.The results showed that at a temperature of 25℃,pH of 5.16,Fe_(3)O_(4)@SiO_(2)-NH_(2)dosage of 0.01 g,and adsorption time of 50 minutes,the adsorption capacity of Fe_(3)O_(4)@SiO_(2)-NH_(2)for Cd^(2+)was 173.91 mg/g.The adsorption of Fe_(3)O_(4)@SiO_(2)-NH_(2)for Cd^(2+)was chemisorption.The Langmuir isotherm adsorption model better described the adsorption process of Fe_(3)O_(4)@SiO_(2)-NH_(2)for Cd^(2+).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 Fe_(3)O_(4)@SiO_(2)-NH_(2)for Cd^(2+)was a spontaneous and endothermic process.

关 键 词：磁性吸附剂 重金属 吸附机理 镉 

分 类 号：X703[环境科学与工程—环境工程]