铝改性凹凸棒土吸附剂在含氟废水中的应用
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摘要
以凹凸棒土(ATP)为载体,硫酸铝为活性前驱体,通过浸渍法制得铝改性凹凸棒土(Al~(3+)/ATP),将其应用于含氟废水中。分析了不同负载化合物、硫酸铝浓度、投加量、pH值等因素对Al~(3+)/ATP吸附氟离子效果的影响,并探讨相关吸附机理。结果表明:当硫酸铝浓度为0.06 mol/L,固液比为1∶10,40℃下超声20 min,可制得吸附剂;在25℃下,当吸附剂投加量为12.5 g/L,pH值为5.6,吸附240 min,氟离子的吸附量为3.7708mg/g,去除率可达到94.27%。吸附过程符合Langmuir等温吸附模型,饱和吸附容量为4.056 8 mg/g;吸附过程用准二级动力学方程更准确。凹凸棒土经过改性后晶体结构未发生明显变化,但比表面积及孔隙体积增大、结晶程度降低,团聚现象减轻。
In this paper, attapulgite(ATP) was used as carrier, aluminum sulfate as active precursor, aluminum-modified attapulgite(Al3+/ATP) adsorbent was prepared by impregnation method and applied to fluorine-containing wastewater. The effects of different supporting compounds, aluminum sulfate concentration,dosage and pH value on the removal rate of fluorine were respectively analyzed and discussed the related mechanism. The results indicated that optimum modified conditions were 0.06 mol/L concentration of aluminum sulfate, 1∶10 solid-liquid ratio and ultraphonic 20 min at 40 ℃. When the addition amount of adsorbent was 12.5 g/L and the adsorption time was 240 min at 25 ℃, the removal rate of fluorion was 94.27%. The adsorption behavior could be depicted by Langmuir equations, and the saturated adsorption capacity was 4.056 8 mg/g. The adsorption behavior follows a pseudo-second-order kinetic model.Although the crystal structure of Al~(3+)/ATP didn't change significantly, it could be seen that the surface area and pore increased clearly, the degree of crystallization and the agglomeration phenomenon both decreased, and the surface was more looser.
In this paper, attapulgite(ATP) was used as carrier, aluminum sulfate as active precursor, aluminum-modified attapulgite(Al3+/ATP) adsorbent was prepared by impregnation method and applied to fluorine-containing wastewater. The effects of different supporting compounds, aluminum sulfate concentration,dosage and pH value on the removal rate of fluorine were respectively analyzed and discussed the related mechanism. The results indicated that optimum modified conditions were 0.06 mol/L concentration of aluminum sulfate, 1∶10 solid-liquid ratio and ultraphonic 20 min at 40 ℃. When the addition amount of adsorbent was 12.5 g/L and the adsorption time was 240 min at 25 ℃, the removal rate of fluorion was 94.27%. The adsorption behavior could be depicted by Langmuir equations, and the saturated adsorption capacity was 4.056 8 mg/g. The adsorption behavior follows a pseudo-second-order kinetic model.Although the crystal structure of Al~(3+)/ATP didn't change significantly, it could be seen that the surface area and pore increased clearly, the degree of crystallization and the agglomeration phenomenon both decreased, and the surface was more looser.
引文
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[16]陈秋强,吴平霄,李涛,等.铁柱撑蒙脱石可见光催化降解活性艳橙性能及动力学研究[J].矿物岩石,2009,29(2):25-30.
[2]周苏,施翠莲,何丹丹,等.氟化工废水处理技术的研究[J].化工设计通讯,2018,44(3):205.
[3]WEI W,WANG X,WANG Y,et al.Evaluation of removal efficiency of fluoride from aqueous solution using nanosized fluorapatite[J].Desalination and Water Treatment,2014,52(31/32/33):6219-6229.
[4]WANG B B,ZHENG B S,ZHAI C,et al.Relationship between fluorine in drinking water and dental health of residents in some large cities in China[J].Environment International,2004,30(8):1067-1073.
[5]GB 5749-2006.生活饮用水卫生标准(毒理学指标)[S].
[6]余文娟.化学沉淀法去除饮用水中微量超标的氟、硬度及硫酸根[D].太原:太原理工大学,2012.
[7]姜科,周康根.晶种诱导絮凝深度处理工业含氟废水[J].工业安全与环保,2018,44(10):74-76,96.
[8]李静波,赵璇,李福志.电絮凝-微滤去除饮用水中的氟[J].清华大学学报(自然科学版),2007,47(9):1495-1497.
[9]谌任平,汪昆平,徐乾前.活性炭负载铝吸附去除水中氟离子的研究[J].三峡环境与生态,2013,35(4):8-11.
[10]章绍康,弓晓峰,申钊颖,等.改性凹凸棒土对土壤在中Cd2+吸附解吸及钝化效果影响[J].环境工程,2019,37(3):192-197.
[11]何静,张栋,吴磊,等.凹凸棒吸附材料研究进展[J].当代化工研究,2019(2):175-176.
[12]国家环境保护局.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[13]翟宇,李占五,邓寅生,等.改性沸石吸附矿井水中氟离子的试验研究[J].煤炭科学技术,2010,38(9):121-124.
[14]刘芳,郑艳萍,张鸣,等.铁改性凹凸棒土对甲醛废水的处理[J].非金属矿,2018,41(2):101-104.
[15]张彦艳,杨琰琰,李学德.铝盐复合改性凹凸棒石及其除氟性能[J].环境工程学报,2016,10(9):4861-4866.
[16]陈秋强,吴平霄,李涛,等.铁柱撑蒙脱石可见光催化降解活性艳橙性能及动力学研究[J].矿物岩石,2009,29(2):25-30.