Effect of phosphate complexation on Cd2+ sorption by manganese dioxide (β-MnO2)

Use of hydrous manganese dioxide as a potential sorbent for selective removal of lead, cadmium, and zinc ions from water

“…for the sorption by hydrous manganese dioxide (HMO) of cationic or anionic pollutants, i.e., heavy metal ions [14], arsenate [15], and phosphate [16], from natural waters has attracted considerable attention, because it would significantly mediate the fate and mobility of the targeted pollutants in water [17,18]. For example, Kanungo et al [19] and Kanungo et al [20] studied the sorption of Co(II), Ni(II), Cu(II), and Zn(II) ions on HMO particles in the presence of different electrolytes.…”

“…Nevertheless, most of the available studies in the open Refs. [17,18] were conducted in terms of environmental and geochemical aspects, i.e., the effect of HMO sorption on toxic metal mobility in the aquatic environment, and inadequate efforts were made from a technical viewpoint to evaluate the properties of HMO as a potential sorbent for heavy metal ion removal from contaminated waters. For example, the sorption selectivity of HMO toward targeted metals in the presence of many commonly encountered ions, such as Na + , K + , Ca 2+ , and Mg 2+ , is of particular significance when it is used in associated wastewater treatment.…”

Facile synthesis of γ-MnOOH micro/nanorods and their conversion to β-MnO2, Mn3O4

“…Among them, MnOOH presents particular interest because of their applications as catalysts and as an effective precursor to synthesize lithium manganese oxides for rechargeable lithium-ion batteries [5][6][7]. Manganese dioxides are some of the most attractive inorganic materials because of their structural flexibility and wide applications in catalysis, ion exchange, molecular adsorption, biosensors, and energy storage [8][9][10][11]. Mn 3 O 4 possesses interesting magnetic [12], electrochemical properties [13,14], and may be used as an efficient catalyst for several processes [15,16].…”

Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments

“…2), or a mixture of ternary complexes and electrostatics [38,39]. Zaman et al [40] confirmed that the sorption of Cd on a manganese dioxide was increased by the presence of phosphate. The formation of type-A-ternary complexes was the main mechanism at lower pH, while the formation of type-B-ternary complexes was the predominant mechanism at higher pH values.…”