Interception Effect of Geopolymer Modified by CTAB on Underground Pollution Sources

Abstract

Abstract: In view of the interception problem of organic pollutants and inorganic metal ions combined with groundwater pollution sources, a design method of geopolymer interception wall material with cetyltrimethylammonium bromide (CTAB) as modifier was proposed, and the influence of the amount of modifier on the permeability coefficient, compatibility, adsorption capacity and compressive strength of geopolymer were studied. The results show that the modified geopolymer has a high adsorption capacity to the phenol-hexavalent chromium compound groundwater pollution source under the premise of maintaining good permeability coefficient, compatibility and compressive strength, and can be used as an economical and effective interception wall material. When the content of sodium silicate is 8%(mass fraction), the modulus of sodium silicate is 1.0, the water-raw material ratio is 0.30, and CTAB addition is 2.0%(mass fraction), the permeability coefficient of the sample is 4.61×10^-8 cm/s, the compressive strength is 6.25 MPa, and the removal rates of phenol and Cr (VI) can reach 57.51% and 28.18%, respectively. In addition, with the increase of CTAB addition, the permeability coefficient and adsorption capacity of the modified geopolymer increase, while the compressive strength decreases, and no deterioration phenomenon appears in the test blocks.

Key words: geopolymer, cetyltrimethylammonium bromide, interception wall, setting time, permeability coefficient, adsorption performance

CLC Number:

X523

LIU Jianing, HONG Mei, WEI Tao, CHEN Ri, SONG Boyu. Interception Effect of Geopolymer Modified by CTAB on Underground Pollution Sources[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1831-1840.

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