摘要
以Mg(NO3)2·6H2O和La(NO3)3·6H2O为原材料,采用共沉淀法制备了含有少量稀土金属镧的氧化镁基稀土复合脱氟剂。以聚乙烯醇(PVA)和聚偏氟乙烯(PVDF)为粘合剂,利用挤出成型法制备出直径0.5 cm左右的颗粒状复合脱氟剂。利用XRD、SEM和FTIR对制备的复合氧化物脱氟剂进行了表征分析,评价了粉末状及颗粒状复合脱氟剂对水中氟离子的脱除性能。结果表明:粉末复合脱氟剂对水溶液中氟离子的最大平衡吸附量为142.85 mg/g,p H=4~10时吸附效率最高,200 min内达到吸附平衡,而颗粒脱氟剂的最高脱氟量可达25 mg/g以上,25℃下,复合脱氟剂对氟离子的吸附符合Langmuir等温吸附模型和伪二级动力学模型。
A magnesia based lanthanum composite fluorine adsorbent was synthesized by co-precipitation method using magnesium nitrate and lanthanum nitrate as main materials.The composite powder was further molded into grains with a diameter of around 0.5 cm using polyvinyl alcohol(PVA)and polyvinylidene fluoride(PVDF)as adhesives by extrusion molding.XRD,SEM and FTIR were used to characterize and analyze the prepared composite adsorbents.The effect of the powdered and granular composite adsorbents on the removal of fluorine ions in aqueous solution was evaluated.The results showed that the maximum adsorption of powdered composite adsorbent for fluorine ions reached 142.85 mg/g.The highest fluorine adsorption was found in the pH range of 4 to 10,and the adsorption equilibrium could be reached within 200 min.The maximum adsorption of granular composite adsorbent for fluorine ions was over 25 mg/g.At 25℃,the adsorption of the magnesia/lanthanum composite adsorbent for fluorine ions was fitted well to the Langmuir isothermal adsorption model and the adsorption kinetics could be well described by the pseudo-second-order kinetic model.
作者
李欣阳
朱家昕
孙婷婷
王海增
Li Xinyang;Zhu Jiaxin;Sun Tingting;Wang Haizeng(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,Shandong,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2020年第1期147-155,共9页
Fine Chemicals
基金
中央高校基本科研业务费专项(201964021).
关键词
氧化镁基镧复合物
脱氟剂
聚乙烯醇
聚偏氟乙烯
水处理技术
magnesia/lanthanum composite
fluoride adsorbent
polyvinyl alcohol
polyvinylidene fluoride
water treatment technology
