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

Abstract

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

CLC Number:

TQ133.1

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.

Figures/Tables 12

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References 18

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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

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation of CaFeAl-LDO from polyaluminum chloride residue and its adsorption for methyl orange

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