Improved Cd (II) ions removal performance from aqueous solution using cerium doped activated carbon

Capacity and Mechanisms of Pb(II) and Cd(II) Sorption on Five Plant-based Biochars

“…Under the influence of initial dosage, the adsorption amount of Pb 2+ by the five biochar was still greater than that of Cd 2+ , and the affinity of Pb 2+ was stronger as the adsorption sites increased [25]. This is due to the fact that the hydration ionic radius of Pb 2+ (0.401 Å) is smaller than that of Cd 2+ (0.426 Å), and the pKH (negative logarithm of the hydrolysis constant) of Pb 2+ (7.71) is lower than that of Cd 2+ (10.1) [58][59][60]. The properties of these heavy metals themselves cause the difference in adsorption.…”

A novel CO2 activation at room temperature to prepare an engineered lanthanum-based adsorbent for a sustainable arsenic removal from water

“…The process scale-up feasibility is mainly determined by the adsorption capacity of the adsorbent used as separation medium and, consequently, it is the main factor that could constrain the implementation in water purification. Surface functionalization procedures based on multivalent species (e.g., iron, aluminum, cesium) have proved to be effective to enhance the adsorption properties of several materials employed in the arsenic removal with the goal of contributing to reduce the costs of groundwater treatment (Fierro et al, 2009;Hu et al, 2015;Cortés-Arriagada and Toro-Labbé, 2016;Hu et al, 2016;Alijani and Shariatinia, 2017;Yu et al, 2017;Yu et al, 2018;Zhu et al, 2018;Lin et al, 2019;Nguyen et al, 2019;Wu et al, 2019a;Li et al, 2020;Tan et al, 2020;Wang et al, 2020;Al-Gaashani et al, 2021;Liu et al, 2021;Kouotou et al, 2022). Lanthanum has found remarkable properties in adsorbing arsenic and other inorganic and organic compounds (e.g., dyes, phosphates, fluoride, heavy metals) (Di et al, 2006;Deng and Yu, 2012;Sun et al, 2012;Tao et al, 2012;Tang et al, 2014;Mendoza-Castillo et al, 2016;Kalidindi et al, 2017;Zúñiga-Muro et al, 2017;Jeon et al, 2018;Lingamdinne et al, 2019).…”