Investigation of mechanism and critical parameters for removal of arsenic from water using Zr-TiO2composite.
Using the microwave-hydrothermal method for the synthesis of composite, high surface density of hydroxyl groups, as an active adsorption sites for arsenic, was obtained. Adsorption mechanisms of As(III) and As(V) onto zirconium-doped titanium dioxide (Zr-TiO2) were investigated and proposed using macroscopic and microscopic methods. Obtained results are suggesting inner-sphere and outer-sphere adsorption mechanisms for As(III) and As(V), respectively. This allowed us to identify parameters that are critical for the successful removal of arsenic from water, which is essential information for further optimization of the removal process. The composite was further applied for the removal of As(III) and As(V) from water in a dynamic flow through the reactor. Column study proved that the removal of both arsenic species below the value recommended by WHO can be achieved. Elution of As(III) and As(V) from the composite can be done by using small amounts of 0.01 M NaOH solution resulting in preconcentration of arsenic species and possible multiple usage of composite.
a Innovation Center of the Faculty of Chemistry , University of Belgrade , Belgrade , Serbia.
I
http://orcid.org/0000-0002-4570-0540
I
Anđelković
b Department of Chemistry, Faculty of Art & Sciences , Al-Mergeb University , Al-Khums , Libya.
N R R
http://orcid.org/0000-0002-7744-385X
NRR
Amaizah
c Institute of Technical Sciences of the Serbian Academy of Sciences and Arts , Belgrade , Serbia.
S B
http://orcid.org/0000-0002-9264-4406
SB
Marković
a Innovation Center of the Faculty of Chemistry , University of Belgrade , Belgrade , Serbia.
D
http://orcid.org/0000-0001-7465-1373
D
Stanković
d Institute of Chemistry, Technology and Metallurgy, Center of Chemistry, University of Belgrade , Belgrade , Serbia.
M
http://orcid.org/0000-0003-0040-6249
M
Marković
e Faculty of Chemistry , University of Belgrade , Belgrade , Serbia.
D
http://orcid.org/0000-0003-0363-0975
D
Kuzmanović
e Faculty of Chemistry , University of Belgrade , Belgrade , Serbia.
G
http://orcid.org/0000-0002-6727-2604
G
Roglić
D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D014025:Titanium; D014867:Water; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D014874:Water Pollutants, Chemical; D014867:Water; C009495:titanium dioxide; D014025:Titanium; D001151:Arsenic
As(III); As(V); Microwave-hydrothermal synthesis; adsorption; mechanism