Effect of pH on the formation of U(VI) colloidal particles in a natural groundwater

Shi, Yanlin; Zhou, Wanqiang; Wang, Jingyi; Xian, Dongfan; Tan, Zhijian; Du, Linfang; Li, Xiaolong; Pan, Duoqiang; Chen, Zongyuan; Wu, Wangsuo; Liu, Chunli

doi:10.1007/s10967-020-07591-x

Cited by 3 publications

(1 citation statement)

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“…The presence of colloids may alter the propagation of heavy metals in contaminant plumes [26]. The effect of colloids on contaminant transport is dependent on hydrogeological conditions and physicochemical properties of the aquifers [27][28][29][30]. Both groundwater chemistry and site-specific conditions may promote or hinder the co-transport of heavy metals and natural colloids in the subsurface environment [20,28,29].…”

Section: Introductionmentioning

confidence: 99%

Influence of Soil Colloids on Ni Adsorption and Transport in the Saturated Porous Media: Effects of pH, Ionic Strength, and Humic Acid

Wei¹,

Zhu²,

Wang

et al. 2022

Applied Sciences

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Natural colloids are widely distributed in soil and groundwater. Due to their specific characteristics, colloids can actively involve various transport contaminants, resulting in a complicated fate and the transport of heavy metals to the environment. This study investigated the effects of soil colloids on the adsorption and transport of Ni2+ in saturated porous media under different conditions, including pH, ion strength (IS), and humic acid (HA), because these indexes are non-negligible in the fates of various organic or inorganic matters in the subsurface environment. The results indicate that Ni2+ adsorption by soil colloids slightly increased from 17% to 25% with the increase of pH from 5.5 to 7.5 at the IS of 30 mmol·L−1, whilst it significantly reduced from 55% to 17% with the increase of IS from 0 to 30 mmol·L−1 at a pH of 5.5. Both Langmuir and Freundlich models can fit the adsorption isotherms of Ni2+ on soil colloids and quartz sand. According to the column experiment, the presence of soil colloids increased the initial penetration rate, but could not increase the final transport efficiency of Ni2+ in the effluent. The presence of soil colloids has weakened the effect of IS on Ni2+ transport in the sand column. Moreover, this experiment implies that HA remarkably decreased the Ni2+ transport efficiency from 71.3% to 58.0% in the presence of soil colloids and that there was no significant difference in the HA effect on the Ni2+ transport in the absence of soil colloids.

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