Synthesis of nanoscale zero-valent iron immobilized in alginate microcapsules for removal of Pb(ii) from aqueous solution

TY - JOUR

T1 - Synthesis of nanoscale zero-valent iron immobilized in alginate microcapsules for removal of Pb(ii) from aqueous solution

AU - Luo, Si

AU - Lu, Tingting

AU - Peng, Liang

AU - Shao, Jihai

AU - Zeng, Qingru

AU - Gu, Ji Dong

PY - 2014/10/7

Y1 - 2014/10/7

N2 - Alginate microcapsules immobilized nanoscale zero-valent iron (M-NZVI), with diameters from several hundreds nanometers to several micrometers, were synthesized using ferric and calcium ions as the cross-linking cations, and then tested for removal of Pb(ii) from aqueous solution. The size of NZVI particles was only a few nanometers according to transmission electron microscopy (TEM) observation. The synthesized alginate microcapsules were stable in air for as long as they were dried and contained 9.97% of iron by weight. When 0.5 g L -1 of M-NZVI were introduced into an aqueous solution containing 300.0 mg L-1 of Pb(ii), 88% of Pb(ii), 581.7 mg g-1 of Pb(ii) uptake amount were removed from the system in 15 min. The kinetics of the removal reactions, including an initial adsorption phase and a subsequent reduction, is complicated. In addition, the synthesized M-NZVI showed a higher removal capability of Pb compared to NZVI and Ca-alginate particles. This newly synthesized material could be regenerated and reused at least 4 times when the initial concentrations of Pb(ii) were ≤200.0 mg L-1. The higher reaction rates and greater removal capacity suggest that M-NZVI may be a potential material for in situ remediation of metal contaminated water and sediments.

AB - Alginate microcapsules immobilized nanoscale zero-valent iron (M-NZVI), with diameters from several hundreds nanometers to several micrometers, were synthesized using ferric and calcium ions as the cross-linking cations, and then tested for removal of Pb(ii) from aqueous solution. The size of NZVI particles was only a few nanometers according to transmission electron microscopy (TEM) observation. The synthesized alginate microcapsules were stable in air for as long as they were dried and contained 9.97% of iron by weight. When 0.5 g L -1 of M-NZVI were introduced into an aqueous solution containing 300.0 mg L-1 of Pb(ii), 88% of Pb(ii), 581.7 mg g-1 of Pb(ii) uptake amount were removed from the system in 15 min. The kinetics of the removal reactions, including an initial adsorption phase and a subsequent reduction, is complicated. In addition, the synthesized M-NZVI showed a higher removal capability of Pb compared to NZVI and Ca-alginate particles. This newly synthesized material could be regenerated and reused at least 4 times when the initial concentrations of Pb(ii) were ≤200.0 mg L-1. The higher reaction rates and greater removal capacity suggest that M-NZVI may be a potential material for in situ remediation of metal contaminated water and sediments.

UR - http://www.scopus.com/inward/record.url?scp=84907065026&partnerID=8YFLogxK

U2 - 10.1039/c4ta02920h

DO - 10.1039/c4ta02920h

M3 - 文章

AN - SCOPUS:84907065026

SN - 2050-7488

VL - 2

SP - 15463

EP - 15472

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 37

ER -