生物模板辅助水热合成介孔氧化镁及其除氟性能  

Biotemplate-assisted hydrothermal synthesis of mesoporous magnesium oxide and its defluorination performance

作　　者：张家祺 李荻 李颖 杨海明[1] ZHANG Jiaqi;LI Di;LI Ying;YANG Haiming(School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China;School of International Education,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学化学工程学院,辽宁鞍山114051 [2]辽宁科技大学国际教育学院,辽宁鞍山114051

出　　处：《辽宁科技大学学报》2023年第1期26-32,共7页Journal of University of Science and Technology Liaoning

基　　金：国家自然科学基金青年基金(51308276,51102126);辽宁省教育厅优秀人才项目(二层次2015055);辽宁省教育厅项目(2020LNJC06);辽宁科技大学创新团队项目(2017TD02);辽宁科技大学大学生创新创业训练计划(X202110146103)。

摘　　要：针对水中氟离子污染问题,提出利用生物模板辅助水热合成介孔氧化镁脱氟材料。以香蒲绒为生物模板,MgCl2为镁源,尿素为沉淀剂,通过水热-煅烧后,得到介孔氧化镁脱氟材料。对材料进行SEM、BET、XRD、FT-IR等表征,考察吸附剂用量、溶液pH值、共存阴离子等因素对脱氟效果的影响。结果表明,当氟离子浓度为50 mg/L时,在吸附剂用量为1.2 g/L、反应时间为90 min、pH=2~11、25℃条件下,脱氟效果均能达到98%以上,受共存离子Cl^(-)、SO_(4)^(2-)、NO_(3)^(-)、HCO_(3)^(-)、CO_(3)^(2-)影响不大,受PO_(4)^(3-)影响较大。吸附过程符合Langmuir吸附等温线和准二级动力学,饱和吸附量为109.82 mg/g,属于单分子层的放热过程。经5次循环吸附实验后,氟离子的去除率降至55.65%。For pollution issues of the fluoride ions in water,the defluorinated material of mesoporous magnesium oxide with biotemplated-assisted is synthesized in this paper.Using cattail fiber(CFs)as a biological template,magnesium chloride as a magnesium source and urea as precipitating agents,the mesoporous magnesium oxide was synthesized by hydrothermal and calcination methods.The materials were characterized by SEM,BET,XRD and FT-IR.The effects of adsorbent dosage,solution pH and coexisting anions on the defluorination were investigated.The results showed that under the conditions of the fluoride concentration 50 mg/L,the amount of adsorbent 1.2 g/L,the reaction time 90 minutes,pH=2~11,and 25℃,the fluoride removal rate could reach over 98%.The fluoride removal process was not significantly affected by the co-existing ions such as Cl^(-),SO_(4)^(2-),NO_(3)^(-),HCO_(3)^(-),and CO_(3)^(2-),but greatly affected by PO_(4)^(3-).The fluoride adsorption process was well described by Langmuir adsorption isotherm model and pseudo-second-order dynamic model.The saturation adsorption capacity was 109.82 mg/g.The adsorption process was supposed to be dominated by monolayer exothermic.After 5 cycles of adsorption experiments,the removal rate of the fluoride ions was decreased to 55.65%.

关 键 词：水热合成 生物模板法 香蒲绒 介孔氧化镁 

分 类 号：X703[环境科学与工程—环境工程]