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Removal efficiency of Cr(VI) was increased with increasing adsorbent dosage, but was decreased with increasing initial Cr(VI) concentration and temperature. Removal efficiency of Cr(VI) was decreased in the presence of sulfate and carbonate ions. Adsorption kinetic study revealed that a pseudo-second order model better described the removal data than a pseudo-first order model and an intra-particle diffusion model. Maximum adsorption capacity was estimated to be 34.48 mg\/g. Thermodynamic studies indicated that adsorption of Cr(VI) onto Scallop shell-Fe3O4 nanoparticles occurred via an exothermic (\u0394H = \u2212320.88 KJ mol\u22121) process. Adsorption efficiency of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was maintained even after eight successive cycles.<\/jats:p>","DOI":"10.2166\/wst.2017.120","type":"journal-article","created":{"date-parts":[[2017,2,28]],"date-time":"2017-02-28T01:10:26Z","timestamp":1488244226000},"page":"2369-2380","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":15,"title":["Application of Scallop shell-Fe3O4 nanoparticles for the removal of Cr(VI) from aqueous solutions"],"prefix":"10.2166","volume":"75","author":[{"given":"Azita","family":"Mohagheghian","sequence":"first","affiliation":[{"name":"Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robabeh","family":"Vahidi-Kolur","sequence":"first","affiliation":[{"name":"Department of Environmental Health Engineering, School of Health, Guilan 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