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[1]QI Li,LIU Zhijie,LI Jinbin,et al.Study on Adsorption Capacities of Loess Calcareous Concretion to Weight Metal Ions in Water Body[J].Research of Soil and Water Conservation,2019,26(05):366-370,376.

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Study on Adsorption Capacities of Loess Calcareous Concretion to Weight Metal Ions in Water Body

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 05 Page number: 366-370,376 Column: Public date: 2019-09-06

Title:: Study on Adsorption Capacities of Loess Calcareous Concretion to Weight Metal Ions in Water Body

Author(s):: QI Li^1,2,3,4, LIU Zhijie⁵, LI Jinbin^1,2,3,4, WANG Luyao^1,2,3,4; 1. Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an 710075, China;
2. Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an 710075, China;
3. Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Xi’an 710075, China

Keywords:: loess calcareous concretion; heavy metal ions; single adsorption; adsorption rate

CLC:: X13

DOI:: -

Abstract:: Calcareous concretion was used as adsorbent and heavy metal ions (Cu²⁺, Zn²⁺, Cd²⁺ and Pb²⁺) were used as adsorbates. Different particle size, adsorption time, pH, adsorbent dosage and initial concentration of heavy metals were studied by single heavy metal adsorption test. The influence of temperature and other factors on the adsorption of heavy metal ions by calcareous nodules was investigated, and the optimal conditions for the adsorption of heavy metal ions by calcareous concretion were determined. The results show that the adsorption rates of Cu²⁺, Zn²⁺ and Pb²⁺ decrease gradually with the increase of particle size, but have no obvious effect on Cd²⁺; with the increase of adsorption time, adsorbent dosage and temperature, the adsorption rates of Cu²⁺, Zn²⁺, Cd²⁺ and Pb²⁺ gradually increase; the adsorption rates of Cu²⁺, Zn²⁺ and Cd²⁺ decreased gradually with the increase of the initial concentrations of heavy metal ions, while the adsorption rate of Pb²⁺ increases first and then decreases; with the increase of pH, the adsorption rate of Cd²⁺ increases first and then increases slowly; the adsorption rates of Cu²⁺, Zn²⁺ and Pb²⁺ increase first and then decrease; the adsorption capacity of calcareous concretion to four heavy metal ions decrease in the order:Pb²⁺ > Zn²⁺ > Cu²⁺ > Cd²⁺; when the particle size is 0.25 mm, the adsorption time is 120 min and the dosage is 0.6 g, the amounts of Pb²⁺, Zn²⁺, Cu²⁺; and Cd²⁺ adsorbed by the calcareous concretion can achieve the higher level, and the adsorption rates can reach 83.33%, 77.78%, 73.81% and 81.93% of their maximum adsorption rates, respectively. The optimal pH scales for calcareous concretion to adsorb Pb²⁺, Zn²⁺, Cu²⁺ and Cd²⁺ are 7, 6, 5 and 8, respectively, and the optimal temperature is 50℃.

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