Contribution (Oral/Poster/Keynote)
Functional Graphene Oxide as sorbent for Ni(II) Removal
Fengli Qu
Shandong Provincial Key Laboratory of Life-Organic Analysis, College of Chemistry and Chemical
Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
hou123@ymail.com
This study investigates the absorption behavior of Ni(II) at three different kinds of Graphene oxide (GO)
derivate: N-(trimethoxysilylpropyl) ethylenediamine triacetic acid modified graphene oxide (EDTA-GO),
3-Tri-methoxysilyl-propyl-diethylenetriamine (Amine-silane) modified graphene oxide (Amine-GO), and
GO. First of all, EDTA-silane or Amine-silane was linked to GO surface through a silylation process. And
these GO derivatives can be used as heavy metal sorbents for Ni(II) removal.
In a typical process, The adsorption experiment was carried out by adding 20 mg of EDTA-GO or
Amine-GO to a 20 mL mixture that contained 10 ml of Ni(II) solution and 10 mL of buffer solution in a
plastic vial at room temperature (25 ± 2 °C). The initial Ni(II) concentrations varied from 1 ppm to 200
ppm (or mg/mL) and the pH value of all the solutions were maintained at pH 6.5 with a buffer solution.
The experimental results show that the GO sorbents can dramatically remove Ni(II) from contaminated
water with the EDTA-GO having the best removal properties. The adsorption capacity for Ni (II) removal
is (108 ± 16) mg/g at pH 6.5 ~7.2, and the adsorption was finished within 30 minutes. The adsorption
behaviors of nickel cations removal and the effects of solution conditions such as pH and ionic strength
were also investigated.
We had investigated the desorption behavior and found that the above GO-derivate can be reused after
an HCl-washing process. These results demonstrated potential applications in the environmental
protection.
In recycle experiment, 80% percent of its initial adsorption capacities of EDTA-GO was we remained
after 20 cycles and 87% percent of its initial adsorption capacities of Amine -GO was we remained after
20 cycles.
The selectivity of the as-synthesized Amine-GO and EDTA-GO toward Cu2+, Ni2+, Fe2+ and Cd2+ were
also investigated.
It was founded that when four of above metal ions at the same solution, the
percentage of Nickel on EDTA-GO surface is higher than that all of the other three ions, proved that
EDTA-GO was a good sorbent for nickel in mixture solution. In contrary, the percentage of Copper on
Amine-GO surface is higher than that all of the other three ions, proved that amine-GO was a good
sorbent for copper in mixture solution. These results suggested that GO modified with different
functional groups can be designed for different heavy metal removal. Therefore, the newly GO
adsorbent may provide selective separation of different metals from various waste water systems.
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Figures
Figure 1. The isotherms of Ni(II) at sorbents
at pH 6.8
Figure 2. The photography of various sorbent
treated Ni(II) solution