TY - JOUR
T1 - Remarkable promotion in particle dispersion and electron transfer capacity of sulfidated nano zerovalent iron by coating alginate polymer
AU - Li, Dan
AU - Zhong, Yin
AU - Wang, Heli
AU - Huang, Weilin
AU - Peng, Ping'an
N1 - Funding Information:
This study was supported financially by the National Natural Science Foundation of China (Grant Nos. 41773132 and 41907292 ), Guangdong Foundation for Program of Science and Technology Research (Grant No. 2017B030314057 and 2019B121205006 ), the State Key Laboratory of Organic Geochemistry , GIGCAS (Grant Nos. SKLOG-201910 and SKLOG2020-4 ), and Research Start-up Funds of DGUT ( GC300501-115 ). This is contribution No. IS-2928 from GIGCAS.
Funding Information:
This study was supported financially by the National Natural Science Foundation of China (Grant Nos. 41773132 and 41907292), Guangdong Foundation for Program of Science and Technology Research (Grant No. 2017B030314057 and 2019B121205006), the State Key Laboratory of Organic Geochemistry, GIGCAS (Grant Nos. SKLOG-201910 and SKLOG2020-4), and Research Start-up Funds of DGUT (GC300501-115). This is contribution No. IS-2928 from GIGCAS.
PY - 2021/3/10
Y1 - 2021/3/10
N2 - Alginate has been widely employed to increase the performance of nanoscale zerovalent iron (nZVI)-based materials for site remediation. Yet, the effects of alginate on reactivity of sulfidated nZVI (an efficient reductant material) towards contaminants have been understood poorly. In this study, we have developed a one-step synthesis of alginate-coated sulfidated nZVI (S-nZVI@alginate) under air atmosphere and evaluated the reactivity of S-nZVI@alginate towards tetrabromobisphenol A (TBBPA) debromination. Surface analysis shows that S-nZVI has been successfully coated by alginate through the interaction of [sbnd]OH and COO− groups of alginate with Fe species. The coating of alginate increases particle stability and dispersion under various conditions and facilitates FeS precipitation on the particle surface. Reactivity experiments show that the coating of alginate significantly enhances TBBPA debromination by S-nZVI. The optimized alginate to Fe weight ratio of S-nZVI@alginate is 0.06, with ~3-fold greater TBBPA debromination rate than S-nZVI. S-nZVI@alginate can completely debrominate TBBPA into bisphenol A via a four-sequential step debromination pathway while S-nZVI not. Its superior reactivity may be attributed to that the formation of alginate-Fe complex can lower the redox potential of Fe species to accelerate electron transfer on the particle surface. The TBBPA debromination rate by S-nZVI@alginate is initially enhanced followed by a decrease with an increase in TBBPA concentration, while it can increase 3.3-, 8.9- and 5.6-fold by increasing S-nZVI@alginate dosage, decreasing pH and adding co-contaminant Cd2+, respectively. S-nZVI@alginate has greater performance in aging and reusability tests than S-nZVI, and achieves rapid TBBPA removal from wastewater, which may be due to the role of alginate on inhibiting surface oxidation of Fe and S species. Taken together, these results suggest that S-nZVI@alginate provides better reactivity, longevity and reusability than S-nZVI, having the great potential for application into site remediation.
AB - Alginate has been widely employed to increase the performance of nanoscale zerovalent iron (nZVI)-based materials for site remediation. Yet, the effects of alginate on reactivity of sulfidated nZVI (an efficient reductant material) towards contaminants have been understood poorly. In this study, we have developed a one-step synthesis of alginate-coated sulfidated nZVI (S-nZVI@alginate) under air atmosphere and evaluated the reactivity of S-nZVI@alginate towards tetrabromobisphenol A (TBBPA) debromination. Surface analysis shows that S-nZVI has been successfully coated by alginate through the interaction of [sbnd]OH and COO− groups of alginate with Fe species. The coating of alginate increases particle stability and dispersion under various conditions and facilitates FeS precipitation on the particle surface. Reactivity experiments show that the coating of alginate significantly enhances TBBPA debromination by S-nZVI. The optimized alginate to Fe weight ratio of S-nZVI@alginate is 0.06, with ~3-fold greater TBBPA debromination rate than S-nZVI. S-nZVI@alginate can completely debrominate TBBPA into bisphenol A via a four-sequential step debromination pathway while S-nZVI not. Its superior reactivity may be attributed to that the formation of alginate-Fe complex can lower the redox potential of Fe species to accelerate electron transfer on the particle surface. The TBBPA debromination rate by S-nZVI@alginate is initially enhanced followed by a decrease with an increase in TBBPA concentration, while it can increase 3.3-, 8.9- and 5.6-fold by increasing S-nZVI@alginate dosage, decreasing pH and adding co-contaminant Cd2+, respectively. S-nZVI@alginate has greater performance in aging and reusability tests than S-nZVI, and achieves rapid TBBPA removal from wastewater, which may be due to the role of alginate on inhibiting surface oxidation of Fe and S species. Taken together, these results suggest that S-nZVI@alginate provides better reactivity, longevity and reusability than S-nZVI, having the great potential for application into site remediation.
KW - Alginate
KW - Debromination
KW - Electron transfer
KW - Oxidation inhibition
KW - Particle dispersion
KW - S-nZVI
UR - http://www.scopus.com/inward/record.url?scp=85096185059&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85096185059&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.143481
DO - 10.1016/j.scitotenv.2020.143481
M3 - Article
C2 - 33221003
AN - SCOPUS:85096185059
VL - 759
JO - Science of the Total Environment
JF - Science of the Total Environment
SN - 0048-9697
M1 - 143481
ER -