Removal of Cr(VI) Ions from Aqueous Solutions Using Nickel Ferrite Nanoparticles: Kinetic and Equilibrium Study

Content Provider	Semantic Scholar
Author	Raziyeh, Zandipak
Copyright Year	2017
Abstract	Chromium (Cr) is a generally heavy metal contaminate because of its highly toxic and bioaccumulatively (1). It is carcinogenic, mutagenic and thus is a threat to human health. In natural environments, chromium can exist mostly in two stable oxidation states: Cr(III) and Cr(VI). Among these two, hexavalent chromium exerts the most damaging toxic effects on living organisms, being highly soluble and mobile in water(2). In aqueous solution Cr(VI) exists as chromate (CrO4 2− ), hydrogen chromate (HCrO4 − ), dichromate (Cr2O7 2− ) and hydrogen dichromate (H Cr2O7 − )(3,4). Cr(VI) used in various industries, including leather tanning, stainless steels production, preparation of pigments and dyes, glass and ceramics, battery, metal electroplating and wood preservation etc (5,6). Cr(VI) has been reported to have detrimental effects on lungs, livers, kidney and nervous system of mammals (7,8). The US Environmental Protection Agency has set the maximum total Cr content in drinking water as 0.1 mg L -1 (9). Thus, the removal of low concentration of Cr(VI) ions from wastewater is very significant (10). Various technologies have been used to remove Cr(VI) from water such as adsorption, chemical treatment, ion exchange, membrane A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: Aug.20, 2016 Received in revised form: Nov.10, 2016 Accepted: Nov. 20, 2016 Available Online: Jan 1, 2017 Background & Aims of the Study: Heavy metals are the most important and main pollutants because of their accumulation and high toxicity even at very low dose and cause serious hazards to ecological system as well as human health. Thus, their removal has been challenged from drinking water and industrial waters with different technologies. The purpose of this work is to investigate the removal of Cr(VI) from aqueous solutions. Materials & Methods: NiFe2O4 nanoparticles was prepared by the co-precipitation method and then applied for adsorption of Cr(VI) ions from water. Characterization of nanoparticles was carried out via TEM, EDX, XRD and BET analysis. Various physicochemical parameters like the effect of contact time, pH and adsorbent dose were studied, using batch process to optimize conditions for maximum adsorption. Results: The results demonstrated that the size of the NiFe2O4 nanoparticles was about 12 nm and had selectivity for Cr(VI) adsorption. Also, adsorption process was found to be fast with equilibrium time of 55 min. Optimum pH was found to be 3. Maximum adsorption capacity (qm) as calculated from Langmuir isotherm was found to be 294.1 mg g . Analysis of adsorption kinetics indicated better applicability of pseudo-second-order kinetic model. Conclusions: The results of this study represented that the synthesized NiFe2O4 nanoparticles could be useful for the simultaneous removal of anionic ions from wastewaters.
Starting Page	17
Ending Page	25
Page Count	9
File Format	PDF HTM / HTML
DOI	10.29252/archhygsci.6.1.17
Volume Number	6
Alternate Webpage(s)	http://jhygiene.muq.ac.ir/article-1-165-en.pdf
Alternate Webpage(s)	https://doi.org/10.29252/archhygsci.6.1.17
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article