Nine kinds of LDHs were synthesized by the co-precipitation method under alkaline conditions with different combinations of trivalent metal compounds (FeCl3, AlCl3, CoCl3) and divalent metal compounds (CaCl2, MgCl2, ZnCl2), which were then coated in situ on the surface of zeolites to synthesize core-shell zeolites/LDHs composites. The zeolites before and after modification were characterized by SEM and X-ray fluorescence spectrometry. Using the different core-shell zeolites/LDHs and original zeolite substrates, the constructed rapid infiltration systems (CRIS) simulated test columns were set to treat the municipal sewage containing hexavalent chromium, Cr(VI). Isothermal adsorption tests were subsequently performed. The average removal efficiencies of the small-sized zeolites were much higher than those of the large-sized zeolites. For the small-sized zeolites, the Cr(VI) removal performances of the Mg-LDHs- and Al-LDHs-modified zeolite substrates were efficiently enhanced in particular, which could reach over 90%. And the removal rate of core-shell zeolites/ZnAl-LDHs reached 94.5%. Meanwhile, the maximum adsorption capacity of ZnAl-LDHs-modified zeolites could reach 51.0 mg/kg, indicating that the adsorption properties could be enhanced by ZnAl-LDHs coating. During the purification experiments, most of the LDHs-modified zeolites maintained their predominant chemical adsorption ability for the removal of Cr(VI). Therefore, the small-sized core-shell zeolites/ZnAl-LDHs composites could be used as potential substrates for the efficient removal of Cr(VI) in CRIS.
Cr(VI) removal Zeolite substrate Coating modification ZnAl-LDHs Different metal compounds Constructed rapid infiltration system
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The authors also thank the Material Research and Testing Center, Wuhan University of Technology for their technical support in the characterization of the original and modified zeolite substrates.
This work was funded by the National Natural Science Foundation of China (NOs. 31670541, 31270573, 31400435) and the Excellent Academic Dissertation Cultivation Funds of Postgraduate in Wuhan University of Technology (No. 2017-YS-043).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Ali IO, Hassan AM, Shaaban SM, Soliman KS (2011) Synthesis and characterization of ZSM-5 zeolite from rice husk ash and their adsorption of Pb2+ onto unmodified and surfactant-modified zeolite. Sep Purif Technol 83:38–44CrossRefGoogle Scholar
Asiabi H, Yamini Y, Shamsayei M (2017) Highly selective and efficient removal of arsenic(V), chromium(VI) and selenium(V) oxyanions by layered double hydroxide intercalated with zwitterionic glycine. J Hazard Mater 339:239–247CrossRefGoogle Scholar
Chen JM (2012) Comparative experiment study on the total phosphorus removal efficiency of different infiltration media combinations in the CRI system. Adv Mater Res 415-417:1735–1739CrossRefGoogle Scholar
Chen TH, Feng YL, Xu HF, Peng SC, Huang CH, Tang SP (2004) Treatment of wastewater containing Cr(VI) by LDHs synthesizing in situ. Environ Sci 25(2):89–93Google Scholar
Dubinin MM, Radushkevich LV (1947) Proceeding of the academy science. Phy Chem Sect 55:331–333Google Scholar
Environmental Protection Agency (EPA), Center for Environmental Research Information (1990) Environmental pollution control alternatives: drinking water treatment for small communities. Tratamento Da AguaGoogle Scholar
Erdem E, Karapinar N, Donat R (2004) The removal of heavy metal cations by natural zeolites. J Colloid Interface Sci 280:309–314CrossRefGoogle Scholar
Goyer RA, Mehlman MA (1977) Advances in modern toxicology: toxicology of trace elements. Hemisphere Publishing CorporationGoogle Scholar
Guo L, Zhang XL, Chen QZ, Ruan CY, Leng YJ (2015) Enhanced removal performance by the core-shell/MgFe-layered double hydroxides (LDHs) for municipal wastewater. Environ Sci Pollut Res 23:6749–6757CrossRefGoogle Scholar
Ismael IS (2010) Synthesis and characterization of zeolite X obtained from kaolin for adsorption of Zn(II). Acta Geochim 29:130–136Google Scholar
Jaiswal A, Mani R, Banerjee S, Gautam RK, Chattopadhyaya MC (2015) Synthesis of novel nano-layered double hydroxide by urea hydrolysis method and their application in removal of chromium(VI) from aqueous solution: kinetic, thermodynamic and equilibrium studies. J Mol Liq 202:52–61. https://doi.org/10.1016/j.molliq.2014.12.004CrossRefGoogle Scholar
Juan JT, Maria AG, Marta IL (2001) Experimental evidence in favor of an initial one-electron-transfer process in the heterogeneous photo-catalytic reduction of chromium(VI) over TiO2. Langmuir 17:3515–3517CrossRefGoogle Scholar
Khitous M, Salem Z, Halliche D (2016) Effect of interlayer anions on chromium removal using Mg-Al layered double hydroxides: kinetic, equilibrium and thermodynamic studies. Chinese J Chem Eng 24:433–445CrossRefGoogle Scholar
Leone V, Canzano S, Iovino P, Salvestrini S, Capasso S (2013) A novel organo -zeolite adduct for environmental applications: sorption of phenol. Chemosphere 91:415–420CrossRefGoogle Scholar
Lian YL, Xu MY, Zhong YM, Yang YQ, Chen FR, Guo J (2015) Ammonia oxidizers in a pilot-scale multilayer rapid infiltration system for domestic wastewater treatment. PLoS One 10:1–18Google Scholar
Wu Q, Zhang Y, Zhang Q, Yao L, Xie G (2008) Processing of chromium(VI)-contaminated wastewater with Chengde’s organically modified zeolite. J Lanzhou Univ Technol 34(3):69–72Google Scholar
Zhang XL, Zhang S, He F, Wu ZB (2007) Different performance of eight filter media in vertical flow constructed wetland: removal of organic matter, nitrogen and phosphorus. Fresenius Environ Bull 16:1468–1473Google Scholar
Zhang XL, Liu XT, Xu L, Luo Q, Chen JJ, Hu L, Jin JH (2013) Purification effect of vertical flow constructed wetlands using modified substrates coated with MgFe-LDHs. China Environ Sci 33:1407–1412Google Scholar