Subscriber access provided by UB + Fachbibliothek Chemie | (FU-Bibliothekssystem)
Article
Adsorption characteristics of mercury (II) ions from aqueous solution onto chitosan-coated diatomite Necmettin Caner, Ahmet SARI, and Mustafa Tuzen Ind. Eng. Chem. Res., Just Accepted Manuscript • DOI: 10.1021/acs.iecr.5b01293 • Publication Date (Web): 02 Jul 2015 Downloaded from http://pubs.acs.org on July 7, 2015
Just Accepted “Just Accepted” manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides “Just Accepted” as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. “Just Accepted” manuscripts appear in full in PDF format accompanied by an HTML abstract. “Just Accepted” manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). “Just Accepted” is an optional service offered to authors. Therefore, the “Just Accepted” Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the “Just Accepted” Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these “Just Accepted” manuscripts.
Industrial & Engineering Chemistry Research is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Published by American Chemical Society. Copyright © American Chemical Society. However, no copyright claim is made to original U.S. Government works, or works produced by employees of any Commonwealth realm Crown government in the course of their duties.
Page 1 of 39
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
Industrial & Engineering Chemistry Research
1
Adsorption characteristics of mercury (II) ions from aqueous solution onto chitosan-
2
coated diatomite
3 4 5 6 7 8 9 10 11
Necmettin Canera*, Ahmet Sarıb, Mustafa Tüzenb a
Department of Chemistry, Eskişehir Osmangazi University, 26480, Eskişehir, Turkey b Department of Chemistry, Gaziosmanpasa University, 60250, Tokat, Turkey
Abstract The prepared chitosan-coated diatomite (CCD) was characterized using FTIR spectroscopy
12
and SEM techniques. The effects of pH, contact time, sorbent dosage, metal concentration,
13
and temperature on the adsorption (%) of mercury (Hg(II)) from aqueous solution using the
14
CCD sorbent were studied systemically. The monolayer sorption capacities of raw diatomite
15
and CCD sorbents at pH 5 were found to be 68.1 and 116.2 mg/g, respectively. The mean
16
adsorption energy (8.2 kJ/mol) calculated from the Dubinin–Radushkevich (D–R) model
17
indicated that the sorption process occurred via chemisorption. The modified sorbent had
18
good adsorption and desorption performance with respect to reusability after 10 repeated
19
cycles. The thermodynamic calculations revealed that the sorption was viable, spontaneous
20
and exothermic in nature under the conditions studied. The kinetic calculations indicated that
21
the sorption mechanism was well explained by pseudo-second-order model. All results
22
demonstrated that the prepared CCD is an effective sorbent for the removal of Hg(II) from
23
aqueous solution.
24 25
Keywords: Chitosan-coated diatomite, Mercury, Adsorption, Thermodynamics, Kinetics.
26 27 28 29 30 31 32 33 34
*Corresponding author: Necmettin Caner; E-mail addresses:
[email protected] (N. Caner)
1 ACS Paragon Plus Environment
Industrial & Engineering Chemistry Research
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
35
1. Introduction
36
The water pollution resulted from the casual discharge of heavy metals has been causing
37
global concerns for the last few decades. Some metals undoubtedly can have toxic effects on
38
several types of living organisms.1
39
Mercury found in the global environment has been widely known for centuries to be
40
one of the most toxic heavy metals. This mercury is harmful to nature. Inhaled mercury vapor
41
enters the blood stream via the lungs and spreads throughout the body. Symptoms of mercury
42
poisoning are observed mainly in the form of neuronal disorders, but exposure to this metal
43
will also damage the cardiovascular system, kidneys, liver, bones, etc.2-4 Three basic sources
44
of mercury emissions are known: natural, anthropogenic and re-emitted sources.5 Controlling
45
the concentrations of heavy metals in waste before it is discharge is therefore very important.
46
Membrane separation, ion exchange, electrodeposition and chemical precipitation are among
47
the most common methods for the elimination of heavy metals.6-8 However, these techniques
48
are costly and especially ineffective for removing trace amounts of heavy metals.9 Another
49
disadvantage of these methods is the formation of sludge, which requires the additional
50
processes of disposal and confinement.10 The adsorption methods can be used to effectively
51
remove contaminants from wastewater with high solute loadings, even at dilute
52
concentrations (
