Adsorption and oxidation of arsenic by two kinds of β-MnO2

Enhancing mechanism of arsenic(iii) adsorption by MnO2-loaded calcined MgFe layered double hydroxide

“…Wei et al reported that MnO 2 could remove As( iii ) by absorption and oxidisation. 18 Jian et al used β-MnO 2 composite materials to adsorb arsenic( iii ), indicating that MnO 2 oxidises As( iii ) to As( v ), resulting in an easier removal of As( iii ) from water. 19 However, this material is difficult to crystallise during synthesis, undergoes reduction easily, and releases manganese ions during the process of As( iii ) oxidation.…”

Enhanced Arsenic Removal from Aqueous Solution by Fe/Mn-C Layered Double Hydroxide Composite

“…(5)) and pseudo-second-order (Eq. (6)) kinetic models [31] to calculate the adsorption rate, (5) ln Q e − Q t = ln Q e − k 1 t , (6) t Q t = 1 k 2 Q e 2 + t Q e , where Q t (mg/g) represents the amount of arsenic uptake capacity at time t ; k 1 and k 2 are the rate constants.…”

Purification of As(iii) through oxidation of siderite and As(iii) by dissolved oxygen: behavior and mechanism

“…As a consequence, As(III) adsorption on siderite was better described by the PSO model, which was in line with As(III) adsorption onto other Fe-containing materials. [61][62][63] Furthermore, with the absence of oxygen, the values of k 2 were 0.0346 and 0.0156 with As(III) concentrations of 20 and 40 mg L −1 , respectively (Table S1 †), which were lower than those with the presence of DO. The k 2 value was lowest at a DO concentration of 4.6 mg L −1 .…”