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Abstract

In this paper, the ability of nZVI to remove heavy metals (Cd, Cu, Ni, Pb, Zn) from multicomponent aqueous solutions was investigated through batch experiments. The experimental data were fitted to a second-order kinetic model based on solid capacity. The data for copper and lead fitted well into the second-order kinetic model, thus suggesting that the adsorption had a physical character. The values of the removal ratio and the second-order rate constant indicated that the order of adsorption priority of nZVI was as follows: Pb>Cu>Zn>Cd>Ni. The adsorption isotherm data were described by the most conventional models (Henry, Freundlich, and Langmuir). Equilibrium tests showed that copper and zinc were removed from the solution by adsorption processes, i.e., complexation and competitive adsorption. The test results suggested that the removal processes using nZVI are more kinetic than equilibrium. The study demonstrated that nZVI is favorable reactive material; however, comprehensive investigation should be performed for further in situ applications in PRB technology.

technology. J. Hazard. Mater. 211, 112-125. DOI: 10.1016/j. jhazmat.2011.11.073. 18. Fu, F., Dionysiou, D.D. & Liu, H. (2014). The use of zero-valent iron for groundwater remediation and wastewater treatment: a review. J. Hazard. Mater. 267, 194-205. DOI: 10.1016/j.jhazmat.2013.12.062. 19. Chen, H., et al. (2016). Facile synthesis of graphene nano zero-valent iron composites and their effi cient removal of trichloronitromethane from drinking water. Chemosphere. 146, 32-39. DOI: 10.1016/j.chemosphere.2015.11.095. 20. Zhang, J., et al. (2011). 3-aminopropyltriethoxysilane

Abstract

This paper is focused on the possibility of using iron nanoparticles (nZVI - nano zero-valent iron) to remove selected specific synthetic substances, such as hexachlorobutadiene, pentachlorobenzene, hexachlorobenzene, lindane and heptachlor. Experimental measurements were performed in order to evaluate the effectiveness of the removal of substances and their specific removal rate. Evaluation of the results shows that nanoiron NANOFER 25 is a convenient reactant for the removal of heptachlor, lindane and hexachlorobenzene; while for pentachlorbenzene and hexachlorobutadiene removal, longer contact times are necessary to achieve significant removal efficiencies.

3-aminopropyltriethoxysilane functionalized nanoscale zero-valent iron for the removal of dyes from aqueous solution

Batch studies were conducted to investigate the potential of 3-aminopropyltriethoxysilane modified nano zero-valent iron (APS-NZVI) to adsorb two dyes (acid brilliant scarlet GR and reactive brilliant red K-2BP) from aqueous solution. APS-NZVI showed good adsorption performance for two dyes. Under the adsorption conditions of pH 4.5, initial concentration was 100 mg/L, and time=4h, the maximum adsorption capacities of APS-NZVI were 121.06 mg/g for acid brilliant scarlet GR and 191.5 mg/g for reactive brilliant red K-2BP, respectively. The results revealed that the adsorption behavior of the dyes on the nano-particles fitted well with the Langmuir model and the sorption kinetics fits well the pseudo-second-order rate equation.

Abstract

Amongst all of the reducing agents that can be used in environmental remediation, zero valent iron (ZVI) is one of the most common due to its environmental acceptance, high reaction rate, good availability, and long-term stability. Moreover, ZVI mobility, stability and reactivity can be enhanced by the application of a DC electric current, ie electrokinetics (EK). In the study, six various slurries containing different ZVI were tested for their efficacy for chlorinated ethenes and ethanes degradation. Chlorinated compound concentrations, pH, oxidation-reduction potential (ORP) and conductivity were determined during the long-term kinetic test. Kinetic rate constants calculated for the degradation of three chlorinated ethenes (PCE, TCE and cis-DCE) concluded that EK brings substantial contribution to chlorinated compounds degradation. Nano-scale zero valent iron STAR had the highest reaction rates compare to the other ZVI tested. The performed study could serve as a preliminary assessment of various available ZVI before in-situ application.

for Sustainability - Proceedings of the 2011 World Environ and Water Resour Congress. 2011;1083-1088. DOI: 10.1061/41173(414)111. [11] Li Y, Jin Z, Li Tb. Silica fume supported Fe0 nanoparticles for removal of hexavalent chromium and enhanced transport in water and soil. Kuei Suan Jen Hsueh Pao/J Chinese Ceram Soc. 2011;39(7):1211-1217. [12] Li Y, Jin Z, Li Tb, Li S. Removal of hexavalent chromium in soil and groundwater by supported nano zero-valent iron on silica fume. Water Sci Technol. 2011;63(12):2781-2787. DOI: 10.2166/wst.2011.454. [13] Nikolaidis NP, Dobbs

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-010-0502-1. [21] Henderson AD, Demond AH. Long-term performance of zero-valent iron permeable reactive barriers: A critical review. Environ Eng Sci. 2007;24(4):401-23. DOI: 10.1089/ees.2006.0071. [22] Han Y, Yan W. Reductive dechlorination of trichloroethene by zero-valent iron nanoparticles: Reactivity enhancement through sulfidation treatment. Environ Sci Technol. 2016;50(23):12992-3001. DOI: 10.1021/acs.est.6b03997. [23] Mukherjee R, Kumar R, Sinha A, Lama Y, Saha AK. A review on synthesis, characterization, and applications of nano zero valent iron (nZVI) for environmental

. C. C., & Lee, H. -L. (2005). Chemical reduction of nitrate by nano-sized iron: Kinetics and pathways. Water Res ., 39 , 884–894. 19. Wang, W., Jin, Z., Li, T., Zhang, H., & Gao, S. (2006). Preparation of spherical iron nanoclusters in ethanolwater solution for nitrate removal. Chemosphere, 65 , 1396–1404. 20. Hwang, Y. K. (2011). Mechanism study of nitrate reduction by nano zero valent iron. J. Hazard. Mater ., 185 , 1513–1521. 21. Choe, S., Chang, Y. -Y., Hwang, K. -Y., & Khim, J. (2000). Kinetics of reductive denitrification by nanoscale zero-valent iron

& Management , 52 (2), 210–226. Mukherjee, R., Kumar, R., Sinha, A., Lama, Y., Saha, A.K. (2016). A Review on Synthesis, Characterization, and Applications of Nano Zero Valent Iron (nZVI) for Environmental Remediation. Critical Reviews in Environmental Science and Technology , 46 (5), 443–466. https://doi.org/10.1080/10643389.2015.1103832 Mukhtar, M. (2015). Perceptions of UK Based Customers Toward Internet Banking in the United Kingdom. Journal of Internet Banking and Commerce , 20 (1). https://doi.org/10.1007/978-3-531-92534-9_12 Nasri, W., Charfeddine, L. (2012