Preparation and adsorption performance to methylene blue of fly ash based magnesium silicate nanosheets

doi:10.16085/j.issn.1000-6613.2024-1684

Abstract

Abstract:

The utilization of fly ash is of great significance to the sustainable development of society and environment. NaOH alkali fusion method was adopted to extract SiO₂ from the silicon slag derived from fly ash after extraction of alumina. It was found that the SiO₂ extraction rate reached 72.26% after reaction at 300℃ for 2h with the NaOH and ash mass ratio of 2∶1. Subsequently, MgSiO₃ nanosheets were prepared by hydrothermal reaction using the obtained Na₂SiO₃ solution and MgO as raw materials. The effects of Na₂SiO₃ concentration, Si and Mg molar ratio, reaction temperature and time on the MgSiO₃ product were investigated. XRD, SEM and low temperature N₂ adsorption desorption instrument were used to analyze the composition and structure of the prepared MgSiO₃, and its adsorption performance towards methylene blue (MB) was investigated. MgSiO₃ with high purity, preferable crystallinity and a specific surface area of 240.6m²/g was prepared by reacting at 220℃ for 10h with Na₂SiO₃ concentration of 0.50mol/L and Si and Mg molar ratio of 1.25∶1. The as-prepared MgSiO₃ nanosheets showed fast adsorption rate towards MB with an adsorption capacity of 285.0mg/g. Its adsorption behavior towards MB conformed to the quasi-second-order kinetic model and Langmuir isothermal adsorption model.

Key words: adsorbents, fly ash, silicon dioxide, magnesium silicate, hydrothermal synthesis

摘要：

粉煤灰的资源化利用对社会和环境的可持续发展具有重要意义。本文以粉煤灰基硅渣为原料，采用NaOH碱熔法提取SiO₂，在碱熔温度为300℃、碱与灰质量比为2∶1、反应时间为2h的条件下，SiO₂的提取率达到72.26%；进而以提硅得到的Na₂SiO₃溶液和MgO为原料，通过水热反应制备硅酸镁纳米片，考察了Na₂SiO₃溶液浓度、Si与Mg摩尔比、反应温度及反应时间对硅酸镁纳米片的组成、晶相结构和孔道结构的影响规律。结果表明，在Na₂SiO₃浓度为0.50mol/L、Si与Mg摩尔比为1.25∶1、反应温度为220℃和反应时间为10h的条件下制备了结晶度较好、比表面积达240.6m²/g的介孔硅酸镁纳米片；其对亚甲基蓝（MB）具有较快的吸附速率，吸附量达285.0mg/g，对MB的吸附行为符合准二级动力学模型和Langmuir等温吸附模型。

关键词: 吸附剂, 粉煤灰, 二氧化硅, 硅酸镁, 水热合成

CLC Number:

O611.4

LIU Qian, LI Mengru, BAI Shouli, FENG Yongjun, TANG Pinggui, LI Dianqing. Preparation and adsorption performance to methylene blue of fly ash based magnesium silicate nanosheets[J]. Chemical Industry and Engineering Progress, 2025, 44(11): 6716-6729.

刘倩, 李梦茹, 白守礼, 冯拥军, 唐平贵, 李殿卿. 粉煤灰基硅酸镁纳米片的制备及其亚甲基蓝吸附性能[J]. 化工进展, 2025, 44(11): 6716-6729.

Figures/Tables 17

References 32

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样品	准一级吸附动力学模型			准二级吸附动力学模型
样品	q₁/mg·g^-1	k₁/min^-1	R²	q₂/mg·g^-1	k₂/ g·mg^-1·min^-1	R²
MgSiO₃（1∶1）	46.64	3.75×10^-2	0.3659	275.5	1.72×10^-3	0.9992
MgSiO₃（1.25∶1）	62.53	4.63×10^-2	0.7430	289.9	1.80×10^-3	0.9998
MgSiO₃（1.5∶1）	44.45	2.75×10^-2	0.6320	255.8	2.03×10^-3	0.9997

样品	准一级吸附动力学模型			准二级吸附动力学模型
样品	q₁/mg·g^-1	k₁/min^-1	R²	q₂/mg·g^-1	k₂/ g·mg^-1·min^-1	R²
MgSiO₃（1∶1）	46.64	3.75×10^-2	0.3659	275.5	1.72×10^-3	0.9992
MgSiO₃（1.25∶1）	62.53	4.63×10^-2	0.7430	289.9	1.80×10^-3	0.9998
MgSiO₃（1.5∶1）	44.45	2.75×10^-2	0.6320	255.8	2.03×10^-3	0.9997

吸附剂	比表面积/m²·g^-1	吸附量/mg·g^-1	参考文献
碱活化MgSiO₃	8.6	74.6	[24]
SiO₂@MgSiO₃	588	299	[27]
MgSiO₃	582.3	234.19	[28]
MgSiO₃	521	207	[29]
MgSiO₃纳米管	539.4	175.13	[30]
MgSiO₃纳米管	293	188	[31]
棉/MgSiO₃复合膜	523.1	194.4	[32]
MgSiO₃	240.6	285.0	本文

吸附剂	比表面积/m²·g^-1	吸附量/mg·g^-1	参考文献
碱活化MgSiO₃	8.6	74.6	[24]
SiO₂@MgSiO₃	588	299	[27]
MgSiO₃	582.3	234.19	[28]
MgSiO₃	521	207	[29]
MgSiO₃纳米管	539.4	175.13	[30]
MgSiO₃纳米管	293	188	[31]
棉/MgSiO₃复合膜	523.1	194.4	[32]
MgSiO₃	240.6	285.0	本文