The preparation and characterization of calcined diatomite with high adsorption properties by CaO hydrothermal activation

Ren, Zijie2,3; He, Yuhao2; Zheng, Renji4,5; Guo, Zhengzheng2; Gao, Huimin2,3; He, Xiangliang2; Wu, Feida2; Ji, Xingxiang1

2022-03-05

10.1016/j.colsurfa.2021.128134

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   影响因子和分区

0927-7757

1873-4359

Diatom in diatomite has a unique pore structure, which makes diatomite widely used in environmental protection, medicine, construction and other fields. One of the most important means of modification and purification of low-grade diatomite in industry is to calcine with flux to remove iron and other impurities, as well as to improve the permeability and whiteness of diatomite. However, the adsorption capacity of the treated diatomite is usually reduced greatly, resulting in the limited application in related areas. In this study, a novel diatomitebased absorbent material by hydrothermal modification was prepared by using the flux-calcined diatomite and lime (CaO) as raw materials, and the reaction mechanism was investigated. Compared with ordinary flux calcined diatomite, the methylene blue (MB) adsorption capacity of the modified diatomite prepared by CaO hydrothermal modification increased from 1.58 mg/g to 12.55 mg/g, an increase of nearly 7 times. The results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen sorption-adsorption analysis indicated that the newly formed calcium silicate hydrategels, xonotlite and calcite were successfully synthesized on the surface of the calcined diatomite. The formation of calcium silicate hydrate gels and xonotlite was the results of the hydrothermal reaction of CaO and SiO2, while calcite was the product of the reaction of CaO and residual flux, Na2CO3. The presence of calcium silicate hydrategels and xonotlite on the surface of materials could effectively increase its specific surface area and total pore volume. Not only the increasing of specific surface area, but also the enhancement of negative potential after activation contributed to the adsorption capacity promotion in adsorption test, which was proved by PZC test.

Diatomite Calcination Flux Hydrothermal activation Adsorption material

SCI ; EI

英语

其他

Foundation of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences[KF201814] ; Fundamental Research Funds for the Central Universities[WUT:191008003]

Chemistry

Chemistry, Physical

WOS:000738021500004

ELSEVIER

20220211448944

Aromatic compounds ; Chemical activation ; Gas adsorption ; Lime ; Pore structure ; Removal ; Scanning electron microscopy ; Silica ; Silicate minerals ; Sodium Carbonate ; Specific surface area

Minerals:482.2 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Physical Properties of Gases, Liquids and Solids:931.2

CHEMISTRY

2-s2.0-85122445242

Web of Science

1.Shandong Acad Sci, Qilu Univ Technol, State Key Lab Biobased Mat & Green Papermaking, Jinan 250353, Peoples R China
2.Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430070, Peoples R China
3.Wuhan Univ Technol, Hubei Key Lab Mineral Resources Proc & Environm, Wuhan 430070, Peoples R China
4.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Guangdong Prov Key Lab Soil & Groundwater Pollut, Shenzhen 518055, Peoples R China
5.Southern Univ Sci & Technol, Key Lab Municipal Solid Waste Recycling Technol &, Shenzhen 518055, Peoples R China

Ren, Zijie,He, Yuhao,Zheng, Renji,et al. The preparation and characterization of calcined diatomite with high adsorption properties by CaO hydrothermal activation[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2022,636.

Ren, Zijie.,He, Yuhao.,Zheng, Renji.,Guo, Zhengzheng.,Gao, Huimin.,...&Ji, Xingxiang.(2022).The preparation and characterization of calcined diatomite with high adsorption properties by CaO hydrothermal activation.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,636.

Ren, Zijie,et al."The preparation and characterization of calcined diatomite with high adsorption properties by CaO hydrothermal activation".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 636(2022).