聚氯化铝残渣制备CaFeAl-LDO及其对甲基橙的吸附

doi:10.19964/j.issn.1006-4990.2020-0648

摘要/Abstract

摘要：

采用聚氯化铝生产中的压滤残渣（PACR）制备CaFeAl-LDO吸附剂,对吸附剂的结构、形貌等进行表征,并考察该吸附剂对甲基橙的吸附效果。结果表明,制备的吸附剂焙烧前具有类水滑石的结构,焙烧后其表面变得疏松多孔,有明显的断层及裂痕。BET分析数据显示,CaFeAl-LDO较PACR比表面积增大近1.5倍,FTIR分析也表明CaFeAl-LDO有效融合了Ca-Al和Ca-Fe型吸附剂的特征峰。吸附实验效果表明,CaFeAl-LDO吸附剂最佳焙烧温度为750 ℃,对甲基橙的吸附符合二级吸附动力学模型,吸附后的LDO经高温焙烧后可以循环使用至少5次。

关键词: 聚氯化铝, CaFeAl-LDO, 吸附, 甲基橙

Abstract:

CaFeAl-LDO was prepared by pressure filtration residue（PACR） from polyaluminum chloride production.The structure and morphology of the adsorbent were characterized,and the adsorption effect of adsorbent on methyl orange was investigated.The results showed that the prepared adsorbent had hydrotalcite like structure before calcination,and its surface became loose and porous with obvious faults and cracks after calcination.BET analysis data showed that the specific surface area of CaFeAl-LDO was 1.5 times larger than that of PACR.FTIR also showed that CaFeAl-LDO effectively integrated the characteristic peaks of Ca-Al and Ca-Fe adsorbents.The results of adsorption experiments showed that the best calcination temperature of CaFeAl-LDO adsorbent was 750 ℃,and the adsorption of methyl orange conformed to the second-order adsorp-tion kinetic model,and the CaFeAl-LDO could be recycled for at least 5 times after being calcined at high temperature.

Key words: polyaluminum chloride, CaFeAl-LDO, adsorption, methyl orange

中图分类号:

TQ133.1

韩晓刚,闵建军,顾一飞,刘转年. 聚氯化铝残渣制备CaFeAl-LDO及其对甲基橙的吸附[J]. 无机盐工业, 2021, 53(10): 81-85.

Han Xiaogang,Min Jianjun,Gu Yifei,Liu Zhuannian. Preparation of CaFeAl-LDO from polyaluminum chloride residue and its adsorption for methyl orange[J]. Inorganic Chemicals Industry, 2021, 53(10): 81-85.

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吸附剂	S_BET/ （m²·g^-1）	S_Langmuir/ （m²·g^-1）	孔容/ （cm³·g^-1）	孔径/ nm
PACR	782.2	964.8	0.47	19.35
CaFeAl-LDO	1161.8	1534.6	0.59	21.50

吸附剂	q_e/ （mg·g^-1）	Lagergren一级动力学			二级动力学
吸附剂	q_e/ （mg·g^-1）	k₁/ （L·min^-1）	q_e.c/ （mg·g^-1）	R²	k₂/ （g·mg^-1·min^-1）	q_e.c/ （mg·g^-1）	R²
CaFeAl- LDO	35.17	0.041 4	33.46	0.968	0.001 7	38.26	0.994
PACR	10.59	0.063 2	7.25	0.896	0.025 8	10.37	0.998

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