有机膦酸盐对碱矿渣胶凝材料铅离子固化性能的提升作用

doi:10.11896/cldb.21110095

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Abstract Organo-phosphonate is a kind of strong metal chelating agent, which shows great potential in the stabilization of heavy metal ions in solution environment. However, the current understanding of the stabilizing effect of organic-phosphonate on heavy metal ions in cement-based materials is still limited. The effect of tetrasodium hydroxyethylidene diphosphonate (HEDP-4Na) and curing environment with alternating temperature and humidity on lead ions stabilization of alkali-activated slag-based materials (AASM) were studied, and the phase compositions, pore structures and micro morphology were analyzed in this study. The results show that HEDP-4Na significantly improved the lead stabilization of AASM. Under standard curing condition, the 28 d lead ions leaching concentration of AASM with 0.3% HEDP-4Na decreased by 34.6% compared with the control group without HEDP-4Na, which was related to HEDP-4Na promoting the formation of AASM hydration products with low Ca/Si ratio, enhancing the ability of hydration products to adsorb, encapsulate lead ions and synthesize C-Pb-S-H, and improving the pore structures of AASM. Under the curing environment with alternating temperature and humidity, the deterioration of AASM was accelerated, resulting in the decrease of the lead stabilization. However, the lead ions leaching concentration of AASM with HEDP-4Na was still lower than that without HEDP-4Na. The decrease of the lead stabilization under the curing environment with alternating temperature and humidity was mainly related to the inhibition of the formation of AASM hydration products and the increase of matrix porosity.

Key words： alkali-activated slag-based material phosphonate heavy metal lead ion stabilization mechanism microstructure

Published: Online: 2023-07-10

CLC number:

TU528

Fund:National Natural Science Foundation of China, NSFC-Shandong Joint Fund (U2006223), the Science and Techno-logy Project of Shenzhen, China (JCYJ20190808151011502) and Science and Technology Innovation Cultivation Special Fund Project (‘Climbing Plan' Special Fund) of Guangdong (pdjh2022b0441).

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	Articles by authors
	LONG Wujian
	WU Zhuorui
	WEI Jingjie
	DONG Biqin
	ZHANG Jinrui
	FANG Changle

Cite this article:

LONG Wujian,WU Zhuorui,WEI Jingjie, et al. The Enhanced Lead(Ⅱ) Ions Stabilization of Alkali-activated Slag-based Materials with Appropriate Addition of Phosphonate[J]. Materials Reports, 2023, 37(13): 21110095-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21110095 OR http://www.mater-rep.com/EN/Y2023/V37/I13/21110095

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