Coagulation of methylated arsenic from drinking water: Influence of methyl substitution

Extremely high arsenic removal capacity for mesoporous aluminium magnesium oxide composites

“…This will affect the dominant arsenic speciation and surface complexes (innersphere or outer-sphere complexes) formed between aluminium and arsenic, possibly resulting in the divergent shift (see details in ESI †). [61][62][63] After adsorption of AsIJV), the Mg 2p peak (Fig. S13g, ESI †) of meso-Mg-400 at 50.6 eV is attributed to Mg species in the form of Mg-O-As.…”

“…Based on the current results, it is proposed that the arsenic adsorption mechanism includes a combination of inner-sphere surface complexes (chemical bonding) and outer-sphere complexes (electrostatic interaction) under the present experimental conditions, consistent with previous publications. [61][62][63]67 Future work will focus on the underlying adsorption mechanism (specific surface complexation configurations) of our adsorbents with extremely high adsorption capacities for arsenic by EXAFS and XANES. The FTIR spectra (Fig.…”

Investigation of Self-Assembly Processes for Chitosan-Based Coagulant-Flocculant Systems: A Mini-Review

“…The literature on arsenic removal by coagulation-flocculation with chitosan is sparsely reported [27,33,34,35,36,37,38,39,40]. In general, typical examples of coagulation-flocculation studies have focused on inorganic arsenic species, either arsenate (As(V); HAsO 4 2− ) and/or arsenite (As(III); H 3 AsO 3 ) species [27].…”

“…Arsenite is oxidized to arsenate aerobically, so As(III) will be prevalent in anoxic areas, such as in groundwater environments. In terms of toxicity, the arsenite species are more toxic and mobile over arsenate, where either inorganic form are more toxic than the organic forms of arsenic [36]. Other arsenic species are known based on E h -pH diagrams (see Figure 3), where E h is the voltage potential and pe is defined according to electron activity (a e ), where pe = −log 10 (a e ).…”

Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process

“…However, there have been few studies of the removal of organoarsenic compounds, in contrast to the case for the removal of inorganic arsenic compounds. For example, DMA was very difficult to remove by traditional oxidants and coagulation aids (Hu et al, 2015a). Adsorption has demonstrated to be a promising technology for methylated arsenic removal because it is simple, has a low operating temperature and pressure, and does not need expensive reagents and catalysts.…”