铝锂合金化铣废液合成γ-AlOOH及表征

doi:10.16085/j.issn.1000-6613.2018-0816

摘要/Abstract

摘要：

铝锂合金化学铣切的化铣废液（CMW）会对环境造成严重影响。为有效解决废液处理问题，本文首次利用铝锂合金化铣废液合成出对染料具有优良吸附性能的纳米片状γ-AlOOH。CMW中的NaAlO₂与H₂O₂在室温条件下反应5min即可合成出比表面积高达278m²/g的纳米片状γ-AlOOH。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和N₂吸附-脱附等表征手段，系统研究了H₂O₂和Al₂O₃摩尔比[(5∶1)～ (15∶1)]对合成的γ-AlOOH结构、形貌及结晶度的影响。结果表明，随摩尔比增加，γ-AlOOH的结晶度、晶体粒度和化学基团含量提高，比表面积由137m²/g增加至278m²/g。通过γ-AlOOH对亚甲基蓝（MB）的吸附性能评价了γ-AlOOH的实用性。γ-AlOOH纳米片对MB具有良好的吸附性能，吸附等温线符合Langmuir模型，最大吸附量达173.30mg/g。因此以铝锂合金化铣废液为原料合成的γ-AlOOH具有较高的应用价值，可用作去除废水中染料的高效吸附剂。

关键词: 铝锂合金化铣废液, 水合氧化铝, 纳米粒子, 亚甲基蓝, 吸附, 模型

Abstract:

The waste water from chemical milling of aluminum-lithium alloy(CMW) has caused severe environmental problem. The CMW is for the first time treated to prepared nano-flaky γ-AlOOH with excellent adsorption performance for dye. The NaAlO₂ in the CMW was treated at room temperature for 5min in the presence of H₂O₂，leading to nano-flaky γ-AlOOH with a specific surface area of 278m²/g. The effects of H₂O₂/Al₂O₃ molar ratio [（5∶1）—(15∶1）] on the structure，morphology and crystallinity of the synthesized γ-AlOOH were systematically investigated by X-ray diffraction（XRD）， scanning electron microscopy（SEM）， Fourier transform infrared analysis（FTIR） and N₂ adsorption-desorption. The analysis shows that the crystallinity，crystal size and the chemical group content of the γ-AlOOH increase with the H₂O₂/Al₂O₃ molar ratio，and the specific surface area has risen from 137m²/g to 278m²/g. The usability of the γ-AlOOH is evaluated by adsorption of methylene blue（MB）. The nano-flaky γ-AlOOH had a good adsorption performance for MB，and the adsorption isotherm fits well with the Langmuir model and maximum adsorption capacity is 173.30mg/g. Therefore, the γ-AlOOH synthesized from CMW has a high application value as a high-efficient adsorbent for dye removal from waste water.

Key words: aluminum-lithium alloy chemical milling waste water, aluminum oxyhydroxide, nanoparticles, methylene blue, adsorption, model

中图分类号:

蔡炜, 魏砾宏, 梁法光, 李润东, 李彦龙. 铝锂合金化铣废液合成γ-AlOOH及表征[J]. 化工进展, 2019, 38(04): 1839-1845.

Wei CAI, Lihong WEI, Faguang LIANG, Rundong LI, Yanlong LI. Synthesis and characterization of AlOOH from Al-Li alloy chemical milling waste solution[J]. Chemical Industry and Engineering Progress, 2019, 38(04): 1839-1845.

图/表 11

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样品	晶粒尺寸/nm	结晶度/%
R5	3.6	77.94
R7.5	3.8	79.05
R10	3.1	67.89
R12.5	4.1	82.42
R15	4.4	82.81

样品	晶粒尺寸/nm	结晶度/%
R5	3.6	77.94
R7.5	3.8	79.05
R10	3.1	67.89
R12.5	4.1	82.42
R15	4.4	82.81

样品	等温线类型	回滞环			孔径分布/nm
样品	等温线类型	相对压力（P/P ₀）		类型	孔径分布/nm
R5	IV型	0.60～1.00	H3		2.8～15.6
R7.5，R10，R12.5	IV型	0.45～0.95	H2		2.7～35.7
		0.95～1.00	H3
R15	IV型	0.45～0.95	H2		3.1～10.9
		0.95～1.00	H3

样品	等温线类型	回滞环			孔径分布/nm
样品	等温线类型	相对压力（P/P ₀）		类型	孔径分布/nm
R5	IV型	0.60～1.00	H3		2.8～15.6
R7.5，R10，R12.5	IV型	0.45～0.95	H2		2.7～35.7
		0.95～1.00	H3
R15	IV型	0.45～0.95	H2		3.1～10.9
		0.95～1.00	H3

摩尔比	比表面积 /m²·g^-1	BJH孔体积 /cm³·g^-1	BJH孔径 /nm	参考文献
5	137	0.37	5.83	本文
7.5	163	0.62	10.23	本文
10	202	0.94	17.45	本文
12.5	265	0.73	8.41	本文
15	278	0.78	7.11	本文
5	139	0.21		[26]