Adsorption of heavy metal ions using zeolite materials of municipal solid waste incineration fly ash modified by microwave-assisted hydrothermal treatment

IF 5.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2018-07-15 Epub Date: 2018-05-02 DOI:10.1016/j.powtec.2018.05.003

Qili Qiu , Xuguang Jiang , Guojun Lv , Zhiliang Chen , Shengyong Lu , Mingjiang Ni , Jianhua Yan , Xiaobing Deng

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引用次数: 100

Abstract

In this work, microwave-assisted hydrothermal process was applied to modify the municipal solid waste incineration (MSWI) fly ash and get zeolitic production. The condition of hydrothermal process was fixed at 200 °C and 30 min. The 1 mol/L Na₂HPO₄ was selected as the additive, and the liquid to solid ratio was 3 ml/g. X-ray diffraction results revealed that analogous zeolite crystals formed by the MSWI fly ash during the hydrothermal process. The cation exchange capacity (CEC) was 0.498 meq/g of the modified fly ash, which increased about 22 times compared to the raw MSWI fly ash. To obtain the adsorption mechanism of the modified fly ash, the experiments of adsorption isotherm and kinetics were researched. The adsorption isotherms of heavy metal cations in mixed solution could be described by Langmuir isotherm equations, with a high correlation coefficient value. The experimental products were better fitted by the pseudo second-order kinetics rather than the pseudo first-order kinetics. Although the adsorption capacity of the modified fly ash needs to be promoted, it is a potential utilization for MSWI fly ash to be the original materials as adsorbents.

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微波辅助水热处理改性城市生活垃圾焚烧飞灰沸石材料对重金属离子的吸附研究

采用微波辅助水热法对城市生活垃圾焚烧飞灰进行改性，制备沸石。水热工艺条件固定为200 ℃，30 min。选择1 mol/L Na2HPO4作为添加剂，液固比为3 ml/g。x射线衍射结果表明，MSWI粉煤灰在水热过程中形成了类似的沸石晶体。改性粉煤灰的阳离子交换容量(CEC)为0.498 meq/g，比mswe原料粉煤灰提高了约22倍。为获得改性粉煤灰的吸附机理，进行了吸附等温线实验和吸附动力学研究。重金属阳离子在混合溶液中的吸附等温线可以用Langmuir等温线方程来描述，且相关系数值较高。拟二阶动力学比拟一阶动力学更能拟合实验产物。虽然改性后的粉煤灰的吸附能力有待提高，但将城市生活垃圾粉煤灰作为吸附剂是一种潜在的利用途径。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.