Calcium alginate encapsulated Ni/Fe nanoparticles beads for simultaneous removal of Cu (II) and monochlorobenzene

Synthesis of chitosan-stabilised bimetallic nanoparticles containing Fe and Ni and the reductive degradation of nimesulide

“…system, the diffractograms showed a band centred at  45. Similar findings were recently reported by Weng et al 23 and by Kuang et al 25 . In fact, the most intense peak of Fe 0 is expected at 44.7 (ICSD 631728).…”

Removal of chlorinated organic solvents from hydraulic fracturing wastewater by bare and entrapped nanoscale zero-valent iron

“…As the immobilized nZVI particles are restrained within the confined space of the beads without significant modification of the surface, there is little compromise of their reactivity for contaminant reduction, as reported in DIW or background solutions with low I (Bezbaruah et al, 2009;Bezbaruah et al, 2011). On the other hand, due to the increased affinity of 1,1,2-TCA to the alginate polymer matrix, the adsorbed molecules are more available for the reduction by the immobilized nZVI (Kuang et al, 2015). The alginate polymer matrix could also serve as a physical barrier to the aggregation of entrapped nZVI, thereby providing more accessible reactive sites for reaction (Cho et al, 2015;Lee et al, 2016).…”

“…However, the rate constant kSA (2.36×10 -1 L m -2 h -1 ) for alginate entrapped nZVI was one order-of-magnitude greater than for bare nZVI (3.71×10 -2 L m -2 h -1 ) ( Table 1). This could be attributed to the affinity of organics to alginate, which in turn enhanced the contact between CT and nZVI (Kuang et al, 2015). No significant increase in the reactivity of nZVI toward CT removal was observed after the entrapment, thus further addition of PVA in the polymer matrix was not conducted.…”

“…Therefore, in this study, the proposed mechanisms for 1,1,2-TCA removal by entrapped nZVI consisted of adsorption by the polymer matrix and chemical reduction by the immobilized nZVI. Kuang et al (2015) suggested that the simultaneous removal of Cu and monochlorobenzene by alginate entrapped Ni-doped nZVI beads was a two-step process involving competitive adsorption and catalytic reduction. Similarly, oleic acid-coated alginate entrapped Pd-doped nZVI beads were reported to remove trichlorophenol in water via fast sorption by the polymer layer followed by subsequent dechlorination (Chang et al, 2015).…”

“…As shown in this study, entrapped nZVI is a promising material for high-salinity FWW wastewater treatment, while it can also be applied in permeable reactive barriers for simultaneous removal of metals and organics from groundwater wastewater (Kuang et al, 2015) and deployed as packing materials in a fixed-bed process with continuous-flow wastewater treatment (Chang et al, 2015). To illustrate the economic feasibility of entrapped nZVI for wastewater treatment, a preliminary cost analysis was performed in the present study.…”