Deposition process of coexistent humic acid and calcium ion on ZVI interface

CHEN Zan; MA Xiao-ming; LUO Lu-na; HE Di

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China Environmental Science ›› 2020, Vol. 40 ›› Issue (12) : 5331-5336.

Water Pollution Control

Deposition process of coexistent humic acid and calcium ion on ZVI interface

CHEN Zan, MA Xiao-ming, LUO Lu-na, HE Di

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Abstract

In order to gain more insight into deposition behaviors of environmental matrixes on zero-valent iron (ZVI) interfaces as well as the properties of deposited layers, quartz crystal microbalance with dissipation (QCMD) equipped with ZVI-coated sensor prepared by spraying ZVI suspension was applied to investigate the deposition processes of co-present humic acid (HA) and calcium ion (Ca(Ⅱ)) on ZVI interface, including dosing sequence of HA and Ca(Ⅱ), and the effects of Ca(Ⅱ) concentrations. A more stable layer with larger mass was deposited on ZVI surface when HA was initially introduced into the reaction system than that formed when Ca(Ⅱ) was first injected. The deposition of Ca(Ⅱ) was promoted after HA deposition, whereas HA deposition was less significant after Ca(Ⅱ) deposition, which could be attributed to the difference in the structure composition of outer deposition layer. In addition, it was found that both of the deposition rate and layer mass were increased with the increasing Ca(Ⅱ) concentration from 10 to 200mg/L. In particular, the value of change in dissipation (ΔD) gradually decreased when Ca(Ⅱ) concentration increased from 10 to 100mg/L, indicating the more rigid layer formed. However, if continually increasing Ca(Ⅱ) concentration to 200mg/L, ΔD presented an increasing tendency, with an indication of a more loose and softer conformation of the deposition layer. To sum up, it was found that the dynamic and in-situ process of ZVI passivation layer formation could be monitored via QCMD technique, and the characteristics of ZVI adsorption layer could also be provided.

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calcium ion / humic acid / interface deposition / quartz crystal microbalance with dissipation / zero-valent iron

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CHEN Zan, MA Xiao-ming, LUO Lu-na, HE Di. Deposition process of coexistent humic acid and calcium ion on ZVI interface[J]. China Environmental Science. 2020, 40(12): 5331-5336

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