Quantitatively ion-exchange between Mg(II) and Pb(II)/Cd(II) during the highly efficient adsorption by MgO-loaded lotus stem biochar

Liu, Yanyan; Liu, Caiying; Li, Feng; Yang, Shuao; Shan, Yuxue; Xiao, Fei

doi:10.1016/j.jtice.2023.104736

Cited by 23 publications

(1 citation statement)

References 58 publications

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“…When the initial pH of the solution is increased, the concentration of H + is low, which is conducive to weakening the competitive adsorption of H + with Pb(II) and Cd(II), and more adsorption sites are left on the surface of the adsorbent for the adsorption of target pollutants. At the same time, the low concentration of H + will increase the negative charge on the surface of the adsorbent, reduce the electrostatic repulsion, and promote the surface precipitation of Pb(II) and Cd(II) with OH − or combine more OH − in the form of multiple basic ions 61 . It can be seen from Fig.…”

Section: Resultsmentioning

confidence: 99%

Adsorption properties of Pb(II) and Cd(II) in acid mine drainage by oyster shell loaded lignite composite in different morphologies

An,

Liu,

Chen

et al. 2024

Sci Rep

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A new idea to alleviate environmental pollution is the development of low-cost adsorbents using natural minerals and fishery wastes to treat high concentrations of heavy metal pollutants in acid mine drainage (AMD). Adsorbent morphology, adsorptive and regenerative capacity, and application potential are limiting factors for their large-scale use. Oyster shells capable of releasing alkalinity were loaded on the surface of lignite to develop two composite adsorbents with different morphologies (powdery and globular) for the treatment of AMD containing Pb(II) and Cd(II). The results show that the ability of the adsorbent to treat AMD is closely related to its morphologies. The pseudo-second-order kinetic model and the Langmuir model are suitable to describe the adsorption process of OS-M(P), and the maximum adsorption saturation capacities of Pb(II) and Cd(II) are 332.6219 mg/g and 318.9854 mg/g, respectively. The pseudo-second-order kinetic model and the Freundlich model are suitable to describe the adsorption process of OS-M(G). A synergistic result of electrostatic adsorption, neutralization precipitation, ion exchange and complex reaction is achieved in the removal of Pb(II) and Cd(II) by two morphologies of adsorbents. The regeneration times (5 times) and recovery rate (75.75%) of OS-M(G) are higher than those of OS-M(P) (3 times) and recovery rate (20%). The ability of OS-M(G) to treat actual AMD wastewater is still better than that of OS-M(P). OS-M(G) can be used as a promising environmentally friendly adsorbent for the long-term remediation of AMD. This study provides a comprehensive picture of resource management and reuse opportunities for natural mineral and fishery wastes.

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Section: Resultsmentioning

confidence: 99%