Arsenik Baskılanmış Manyetik Nanopartiküllerin Üretimi
Özet
Arsenic (As) (atomic number 33) has a single stable isotope with 74.9 relative mass units in the
environment. Arsenic has 4 oxidation states with -3, 0, +3 and +5. In general, inorganic arsenic
compounds are more toxic than organoarsenic ones. Their salts are called arsenites [As (III)]
and arsenates [As (V)], respectively. As (III), the most toxic form of the Arsenic, is also the
most common form in the water. Arsenic can cause destructive effects on the skin, respiratory
system, cardiovascular, reproductive, digestive, nervous and immune system. Inorganic arsenic
has been categorized as a registered carcinogen by the International Agency for Research on
Cancer and the United States Environmental Protection Agency (EPA). In the European Union,
the maximum acceptable arsenic concentration in drinking water was determined to be 10 μg/L
(98/83 / EC). EPA recommends an arsenic limit of 5 μg/L in drinking water. In 2005, the
Arsenic Concentration permitted in drinking water was reduced to 50 μg/L (10 μg/L) (R.G.
date: 17.02.2005 and number: 25730) in the new regulation with the "Regulation on Waters for
iv
Human Consumption" in 2005. The arsenic limit was determined as 10 μg/L in TS 266: 2005
"Drinks of water for Human Consumption" published by the Turkish Standards Institute (TSE).
Molecular imprinting technique aims to regulate functional monomers around a mold molecule
with covalent or non-covalent interactions and then to form solid materials with a chemical
function with an appropriate processing process. By removing the mold molecule after the
process, hollow regions specific to the mold molecule are formed and an ideal material is
obtained for the processes such as separation, chemical determination, and catalysis.
Molecularly imprinted polymers (MIP) are polymers that are highly physically and chemically
stable to external influences. In molecular repression, the large size of the particles leads to the
formation of depressed regions in the interior. This creates difficulties in removing the molecule
from the structure and poses a problem that reduces the adsorption capacity and speed.
Nanotechnology offers solutions to these problems of molecular suppression. One of the most
accepted of these solutions is the surface of the nanoparticles. Nanoparticles have a high surface
area/volume ratio and can be significantly enhanced by surface modification of nanoparticles
with potentially different molecules.
In practice, the use of magnetic materials depends on their properties such as magnetism,
morphology, shape, size, polydispersity. They provide advantages in terms of ease of use,
whether intermittent or continuous separation. Magnetic separation techniques have a number
of advantages when compared to standard separation techniques. All steps of separation can
only be performed in one test tube. The separation can be carried out directly on raw samples
containing suspended solid material.
In this work, it is aimed to prepare magnetic nanoparticles with magnetic grain size to
effectively separate the arsenic from aqueous solution and surface waters. The prepared ionsuppressed
magnetic nanoparticles were characterized by zeta size analysis, scanning electron
microscopy, FTIR, NMR, Raman and Elemental analysis methods. Arsenic-imprinted magnetic
nanoparticles have been used to remove arsenic ions from aqueous media. Factors affecting
adsorption (ion concentrations, pH, temperature, competitor ion, etc.) were examined to
optimize the conditions required for arsenic removal. The As(III) and As(V) ion concentrations
were determined by an interactive coupled plasma mass spectroscopy (ICP-MS) method. The
removal of As(III) and As(V) ions from natural water samples was carried out at the end of the
study.
Keywords: Molecular imprinting, nanotechnology, magnetic nanoparticles, arsenic removal,
As(III), As(V).
