载镧磁性碳气凝胶微球的制备及其吸附除氟效果初探
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摘要
通过反相乳液聚合法、化学共沉淀法和饱和硝酸镧溶液浸泡过程,制备得到三元除氟吸附剂载镧磁性碳气凝胶微球(MCAMs-La)。材料表征结果表明,制备的碳气凝胶微球(CAMs)为20μm左右的球体,MCAMs-La饱和磁化强度为36.25emu/g,磁性分离效果良好,材料的等电点pH_(pzc)大约等于8.3,表明MCAMs-La有较广的pH适用范围。吸附实验结果表明MCAMs-La吸附氟离子速度较快,在20min时基本达到吸附平衡;MCAMs-La对氟离子的吸附容量较大,通过Langmuir方程拟合发现,25℃下MCAMs-La对氟离子的最大吸附容量为103.09mg/g。
In this study, a three-element adsorbent(Fe_3O_4–carbon aerogel microsphere–La, MCAMs-La) was successfully developed for fluoride adsorption. The material characterization showed that the carbon aerogel microspheres(CAMs) were spheres of about 20 μm, these MCAMs-La particles featured a quick and easy separation process with the saturation magnetization of 36.25 emu/g. The surface charge of the MGLNP was highly pH-dependent, the corresponding pH_(pzc) was approximately 8.3. The adsorption experiment shows that the absorption of F~- finished within only 20 minutes. The fluoride adsorption isotherm of the MCAMs-La could be well described by the Langmuir equation, and the maximum adsorption capacity was about 103.09 mg/g at 25 ℃.
In this study, a three-element adsorbent(Fe_3O_4–carbon aerogel microsphere–La, MCAMs-La) was successfully developed for fluoride adsorption. The material characterization showed that the carbon aerogel microspheres(CAMs) were spheres of about 20 μm, these MCAMs-La particles featured a quick and easy separation process with the saturation magnetization of 36.25 emu/g. The surface charge of the MGLNP was highly pH-dependent, the corresponding pH_(pzc) was approximately 8.3. The adsorption experiment shows that the absorption of F~- finished within only 20 minutes. The fluoride adsorption isotherm of the MCAMs-La could be well described by the Langmuir equation, and the maximum adsorption capacity was about 103.09 mg/g at 25 ℃.
引文
[1]何瑞敏.改性高分子除氟吸附材料的研究进展[J].高分通报,2018(12):1-8.
[2]朱丹琛,刘秀秀,陈彰旭,等.羟基磷灰石微球的仿生合成及除氟性能[J].化学研究与应用,2019,31(3):570-575.
[3]刘德坤,刘航,杨柳,等.镧、铈改性介孔氧化铝对氟离子的吸附[J].材料导报,2019,33(2):590-594.
[4]苏庆珍,王丽萍.饮用水除氟技术及其机理[J].电力环境保护,2008,24(3):39-41.
[5]Parimala Shivaprasad,Prakash Kumar-singh,Virendra Kumar-saharan,et al.Synthesis of nano alumina for defluoridation of drinking water [J].Nano-Structures and Nano-Objects,2018(13):109-120.
[6]Wen Shuang-xi,Wang Yi-li,Dong Shuo-xun.Performance and characteristics of fluoride adsorption using nanomagnetite graphite–La adsorbent [J].RSC Advances,2015(5):89594-89602.
[7]Saravanan P.Vinod V T P,Sreedhar B.Gum kondagogu modified magnetic nano-adsorbent:An efficient protocol for removal of various toxic metal ions [J].Materials Science and Engineering:C,2012,32(3):581-586.
[8]Yu Yang,Yu Ling.Adsorption of fluoride by Fe-Mg-La triple-metal composite:Adsorbent preparation,illustration of performance and study of mechanisms [J].Chemical Engineering Journal,2015,262:839-846.
[9]全雪萍.碳气凝胶微球的制备及其电吸应用研究[D].绵阳:西南科技大学,2015.
[10]Wu Xiao-mei,Zhang Yan,Dou Xiao-min,et al.Fluoride removal performance of a novel Fe-Al-Ce trimetal oxide adsorbent [J].Chemosphere,2007(69):1758-1764.
[2]朱丹琛,刘秀秀,陈彰旭,等.羟基磷灰石微球的仿生合成及除氟性能[J].化学研究与应用,2019,31(3):570-575.
[3]刘德坤,刘航,杨柳,等.镧、铈改性介孔氧化铝对氟离子的吸附[J].材料导报,2019,33(2):590-594.
[4]苏庆珍,王丽萍.饮用水除氟技术及其机理[J].电力环境保护,2008,24(3):39-41.
[5]Parimala Shivaprasad,Prakash Kumar-singh,Virendra Kumar-saharan,et al.Synthesis of nano alumina for defluoridation of drinking water [J].Nano-Structures and Nano-Objects,2018(13):109-120.
[6]Wen Shuang-xi,Wang Yi-li,Dong Shuo-xun.Performance and characteristics of fluoride adsorption using nanomagnetite graphite–La adsorbent [J].RSC Advances,2015(5):89594-89602.
[7]Saravanan P.Vinod V T P,Sreedhar B.Gum kondagogu modified magnetic nano-adsorbent:An efficient protocol for removal of various toxic metal ions [J].Materials Science and Engineering:C,2012,32(3):581-586.
[8]Yu Yang,Yu Ling.Adsorption of fluoride by Fe-Mg-La triple-metal composite:Adsorbent preparation,illustration of performance and study of mechanisms [J].Chemical Engineering Journal,2015,262:839-846.
[9]全雪萍.碳气凝胶微球的制备及其电吸应用研究[D].绵阳:西南科技大学,2015.
[10]Wu Xiao-mei,Zhang Yan,Dou Xiao-min,et al.Fluoride removal performance of a novel Fe-Al-Ce trimetal oxide adsorbent [J].Chemosphere,2007(69):1758-1764.