以氯化镍、氯化铁为原料,尿素作为沉淀剂,采用均相沉淀技术制备了Ni-Fe-复合金属氢氧化物(Ni-Fe-LDHs)吸附剂。采用X射线衍射(XRD)、红外光谱(FT-IR)、扫描电镜(SEM)、能谱(EDS)等方法对Ni-Fe-LDHs的成分和结构进行了分析,并分析了Ni-Fe-LDHs吸附氟离子的性能。结果表明:Ni-Fe-LDHs呈花状形貌,该花状形貌边缘具有典型的LDHs材料层状结构。Ni-Fe-LDHs对氟去除率为98.2%。吸附氟离子后的Ni-Fe-LDHs材料经过400℃焙烧及碱处理后可进行再生并可重复利用。随着循环次数的增加,Ni-Fe-LDHs除氟率虽然降低,但该材料多次循环后,除氟率逐渐趋于稳定,重复利用12次后,其除氟率仍能达80%以上,具有重要的循环利用价值。
Ni-Fe-complex metal hydroxide (Ni-Fe-LDHs) materials were synthesized by homogeneous precipitation technology with NiCl2·6H2O,FeCl3·6H2O as raw materials and urea as precipitant.The Ni-Fe-LDHs were characterized by XRD,FT-IR,SEM and EDS.The results shown that the synthesized materials had flower-like morphology with the typical layered structure of hydrotalcite structure.The Ni-Fe-LDHs had high fluorine removal rate,and its fluorine removal rate was 98.2%.The Ni-Fe-LDHs could be used repeatly via calcined recovery method.With the number of cycles increased,the defluorination efficiency of Ni-Fe-LDHs was decreased.After 12 cycles,the defluorination rate of Ni-Fe-LDHs tended to be stable and it still keeps 80 %,and the material shown important recycling value.
[1] 朱其顺,许光泉.中国地下水氟污染的现状及研究进展[J].环境科学与管理,2009,34(1):42-51.
[2] 佟元清,李金英,王立新.地下水降氟方法对比研究[J].中国水利,2007,10(1):116-118.
[3] 任婷.高纯石墨生产中含氟废水处理工艺研究[D].哈尔滨:哈尔滨工业大学,2016.
[4] 赵雅萍,祁旭,徐斌.载La(Ⅲ)和载Fe(Ⅲ)氨基膦酸型螯合树脂对氟吸附性能的比较[J].上海环境科学,2004,23(3):96-99.
[5] 李雪玲,刘俊峰,李培元.石灰沉淀法除氟的应用[J].水处理技术,2000,26(6):359-361.
[6] 张学洪,许立巍,朱义年,等.石灰石和方解石预处理酸性含氟废水的试验研究[J].矿冶工程,2005,25(2):49-52.
[7] 薛英文,杨开,梅建.混凝沉淀法除氟影响因素试验研究[J].武汉大学学报,2010,43(4):477-480.
[8] Mohapatra M,Anand S,Mishra B K,et al.Review of fluoride removal from drinking water[J].Journal of Environmental Management,2009,91(1):67-71.
[9] Shen Feng,Chen Xueming,Gao Ping,et al.Electrochemical removal of fluoride ions from industrial wastewater[J].Chemical Engineering Science,2003,58(3):987-993.
[10] Durmaz F,Kara H,Cengeloglu Y.Fluoride removal by Donnan dialysis with anion exchange membranes[J].Desalination,2005,177(1-3):51-57.
[11] Zeni M,Riveros R,Melo K,et al.Study on fluoride reduction in artesian well water from electrodialysis process[J].Desalination,2005,185(1):241-244.
[12] 雷立旭,张卫锋,胡猛,等.层状复合金属氢氧化物:结构、性质及其应用[J].无机化学学报,2005,21(4):451-463.
[13] 沙宇,王显妮,张诚,等.水滑石类材料在水处理中的应用及研究进展[J].水处理技术,2007(8):1-4.
[14] Liu Z,Ma R,Ebina Y,et al.General synthesis and delamination of highly crystalline transition-metal-bearing layered double hydroxides[J].Langmuir,2007,23(2):861-867.
[15] Das D P,Das J,Parida K.Physicochemical characterization and adsorption behavior of calcined Zn/Al hydrotalcite-like compound (HTlc) towards removal of fluoride from aqueous solution[J].Journal of Colloid and Interface Science,2003,261(2):213-220.
[16] Mantilla A,Tzompantzi F,Fernández J L,et al.Photodegradation of phenol and cresol in aqueous medium by using Zn/Al+Fe mixed oxides obtained from layered double hydroxides materials[J].Catalysis Today,2010,150(3-4):353-357.
[17] Hasannia Saeed,Yadollahi Bahram.Zn-Al LDH nanostructures pillared by Fe substituted Keggin type polyoxometalate:synthesis,characterization and catalytic effect in green oxidation of alcohols[J].Polyhedron,2015,99:260-265.
[18] Liu Z,Ma R,Osada M,et al.Synthesis,anion exchange,and delamination of Co-Al layered double hydroxide:assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies[J].Journal of the American Chemical Society,2006,128(14):4872-4880.
[19] Ma Xiangrong,Dang Rui,Liu Jieying,et al.The effect of different complexing agents on preparation of Co2+-Ni2+-Fe3+-CO2-3LDHs[J].Russian Journal of General Chemistry,2016,86(1):144-149.
基金资助
国家自然科学基金(51762042);陕西省科技厅项目(2019PT-18、2018GY-086、2017GY-131和2017JM2039);陕西省重点实验室项目(19JS07)
PDF
