3. MaterialsThe raw silica gel used

3. Materials
The raw silica gel used as adsorbent obtained from, Merck
(Darmstadt Co.) with partical sizes in 60 mesh and 0.063–0.200 nm. It
was treated with nitric acid (HNO3:H2O=1:1) at 100 °C for 3 h, 37%
hydrochloric acid at 100 °C for 6 h for the activation of silica gel particles
[11,19]. The activated silica gel was washed with distilled water and
dried under vacuum for 24 h [20]. The silylant agent 3-aminopropyltrimethoxy
silane (APTS) was used without further purification and
toluene were distilled under reduced pressure just before use. 5-
bromosalicylaldehyde and furfuraldehyde were purchased from Merck
and 3,4-dihydroxybenzaldehyde, copper acetate monohydrate and
nickel acetate tetrahydrate were purchased from Fluka. Organic solvents
used included absolute ethanol (Riedel-de Haen) and diethylether
(Merck) for washing.
3.1. Organofunctionalization of actived silica gel
The silica gel phase-bound amino derivative moiety was prepared
from reaction with (3-aminopropyl)trimethoxysilane as silylation
agent [21–23]. A sample of 10.0 g of activated silica gel suspended in
50.0 cm3 of dry tolune was refluxed and mechanically stirred for 72 h
at 110 °C under dry nitrogen. The modified silica gel was filtered off,
washed twice with toluene, and dried under vacuum at room
temperature for several hours. The functional surface was named
SiNH2 (Fig. 1).
3.2. Preparation of the novel surfaces modified with different aldehydes
A 0.69 g (5 mmol) of the 3,4-dihydroxybenzaldehyde in 50.0 cm3
of toluene reacted with a sample of 5 g of SiNH2, containing a few
drops triethylamine in order to favor the reaction equilibrium.
Triethylamine was added as disprotonant agent to increasing the
efficiency of the reaction. The mixture was refluxed and mechanically
stirred for 72 h at 100 °C. The final product, 3,4-dihydroxybenzaldehyde
was immobilized onto silica, was filtered, washed with toluene,
ethanol and diethylether, and dried under vacuum at room temperature
for 24 h [11]. It was named as I/SiNH2 (Fig. 2).
Other aldehydes, furfuraldehyde and 5-bromosalicylaldehyde,
were immobilized onto modified silica gel according to above
procedure and respectively named II/SiNH2, III/SiNH2 (Fig. 2).
3.3. Adsorption studies of I/SiNH2, II/SiNH2, III/SiNH2 for nickel and
copper ions
The stock solutions of Cu(CH3COO)2·H2O and Ni(CH3COO)2·4H2O
salts were prepared in suitable concentration (200 mg/dm3
), respectively.
Then, the stock solutions were diluted in concentration as 10,
15, 20, 25, 30 mg/dm3
, respectively. The effect of concentration on the
adsorptions of Ni(II) and Cu(II) were studied by adding 20.0 mg of
silica gel adsorbents to aqueous solutions of 10 cm3 at different
concentration values, in 50 cm3 Erlenmeyer flask. These mixtures
were mechanically shaken for 4 h at 25 °C (optimum condition, at
room temperature and pH 6.0) [18,24] to attain equilibrium,
respectively. Then a certain volume of the solutions was separated
from the adsorbents and the residual concentrations of Ni(II) and Cu
(II) were determined by means of a atomic absorption spectrometer.
The amount of metal ions adsorbed by adsorbents was calculated as
show in below equation:
Q = ð Þ Co−C V
W ð1Þ
where Q is the amount of metal ion adsorbed onto unit amount of the
adsorbent (mmol/g), C0 and C are the concentrations of metal ions in
the initial and equilibrium concentrations of the metal ions in aqueous

Kết quả (Việt) 1:

3. The material filled with silica gel materials are used as plates obtained from Merck (Darmstadt Co.) with a size of 60 mesh partical and 0063-0200 nm. It is treated with nitric acid (HNO3: H2O = 1: 1) at 100 ° C for 3 h, 37% hydrochloric acid at 100 ° C for 6 h to activate the particles of silica gel [11.19]. activation buffer by silica gel is washed with distilled water and dried under vacuum for 24 h [20]. Agents silylant 3-aminopropyltrimethoxy silane (APTS) was used without further cleaning and toluene is distilled under reduced pressure immediately before use. 5. bromosalicylaldehyde and furfuraldehyde was purchased from Merck and 3.4-dihydroxybenzaldehyde, copper acetate monohydrate and nickel acetate tetrahydrate was purchased from Fluka. Organic solvents used include absolute ethanol (Riedel-de ha) and diethyl ether (Merck) cleanser. 3.1. Organofunctionalization actived silica gel phase is silica gel-bound amino rooted varieties are prepared from the reaction with (3-aminopropyl) trimethoxysilane as silylation agents [21-23]. A sample of 10.0 g activated silica gel padded with suspended dried tolune 50.0 cm3 was refluxed and stirred for 72 h machinery 110 ° C under dry nitrogen. Modify padded with silica gel is filtered off, washed twice with toluene, and dried under vacuum room temperature for several hours. Functional surface is named SiNH2 (Figure 1). 3.2. preparation of the new surface with different aldehyde 0.69 g (5 mmol) of 3,4-dihydroxybenzaldehyde in 50.0 cm3 of toluene were reacted with a 5 g sample SiNH2, containing a few drops of triethylamine to priority equilibrium reaction. Triethylamine was added as agents disprotonant increasing the efficiency of the reaction. The mixture was refluxed and machinery stirred for 72 h at 100 ° C. The final product, 3,4-dihydroxybenzaldehyde broken up silica, filtered, washed with toluene, ethanol and diethyl ether, and dried under vacuum at a temperature ambient for 24 h [11]. It is named as I / SiNH2 (Figure 2). Aldehydes, furfuraldehyde and 5-bromosalicylaldehyde, other times broken into the top of silica gel according to the procedure and was named corresponding II / SiNH2, III / SiNH2 (Figure 2). 3.3. My research adsorption / SiNH2, II / SiNH2, III / SiNH2 for nickel and copper ions solutions neck Cu (CH3COO) 2 · H2O and Ni (CH3COO) 2 · 4H2O salt was prepared at a concentration like of (200 mg / dm3 ), respectively. Then, the stock solution was diluted at a concentration of 10, 15, 20, 25, 30 mg / dm3 , respectively. The effectiveness of focusing on the adsorptions Ni (II) and Cu (II) was studied by adding 20.0 mg of silica gel adsorbents to the aqueous solution of 10 cm3 at different concentrations of values, in Erlenmeyer flask 50 cm3. Mixtures of vibration machines for 4 h at 25 ° C (optimal conditions, at room temperature and pH 6.0) [18.24] to achieve equilibrium, respectively. Then, a certain volume of the solution was separated and the concentration of adsorbents balance of Ni (II) and Cu (II) was determined by means of atomic absorption spectrometry. Number of adsorbents adsorbed metal ions was calculated as below equation Show: Q = Þ ð Co-CV W d1Th where Q is the amount of metal ions adsorbed on the number of units outstanding (mmol / g) , C0 and C is the concentration of metal ions in the beginning balance and the concentration of metal ions in aqueous solution

Kết quả (Việt) 2:

3. Materials
The materials used silica gel as adsorbent obtained from Merck
(Darmstadt Company) with a size of 60 mesh and partical 0.063 to 0.200 nm. It
was treated with nitric acid (HNO3: H2O = 1: 1) at 100 ° C for 3 hours, 37%
hydrochloric acid at 100 ° C for 6 h to activate the particles of silica gel
[11.19]. The silica gel activation was washed with distilled water and
dried under vacuum for 24 hours [20]. Agents silylant 3 aminopropyltrimethoxy
silane (APTS) was used without further purification and
toluene is distilled under reduced pressure prior to use. 5
bromosalicylaldehyde and furfuraldehyde was purchased from Merck
and 3.4-dihydroxybenzaldehyde, copper acetate monohydrate
nickel acetate tetrahydrate was purchased from Fluka.
Use organic solvents include absolute ethanol (Riedel-de Haen) and diethyl ether
(Merck) for washing.
3.1. Silica gel Organofunctionalization actived
The phase silica gel bound amine derivative thereto have been prepared
from the reaction with (3-aminopropyl) trimethoxysilane as silylation
agents [21-23]. A 10.0 g sample of silica gel activated suspended in
50.0 cm3 of dry tolune reflux and stir for 72 h
at 110 ° C in dry nitrogen. The silica gel amendment was filtered out,
washed twice with toluene, and dried under vacuum at room
temperature for several hours. Functional surfaces was named
SiNH2 (Fig. 1).
3.2. Novel Surface preparation with other aldehydes
0.
69 g (5 mmol) of 3,4-toluene dihydroxybenzaldehyde in 50.0 cm3 reacted with a 5 g sample SiNH2, containing a few
drops of triethylamine to facilitate the equilibrium reaction.
Triethylamine was added as agents disprotonant to increase
the efficiency of the reaction. The mixture was reflux and machinery
stirred for 72 hours at 100 ° C. The final product, 3,4-dihydroxybenzaldehyde
be fixed on silica, filtered, washed with toluene,
ethanol and diethyl ether, and dried under vacuum at room temperature
for 24 hours [11]. It was named the I / SiNH2 (Fig. 2).
Other aldehydes, furfuraldehyde and 5-bromosalicylaldehyde,
silica gel was fixed up on modified according to
the respective procedures and named II / SiNH2, III / SiNH2 (Fig. 2).
3.3. Research absorptive capacity of the I / SiNH2, II / SiNH2, III / SiNH2 for nickel and
copper ions
The stock solution of Cu (CH3COO) 2 · H2O and Ni (CH3COO) 2 · 4H2O
salt was prepared in appropriate concentration (200 mg / dm3
), respectively.
Then, the stock solution was diluted at concentrations of 10,
15, 20, 25, 30 mg / dm3
, respectively. The effect of concentration on the
adsorptions of Ni (II) and Cu (II) was studied by adding 20.0 mg of
adsorbent silica gel to an aqueous solution of 10 cm3 in different
concentration values, in 50 cm3 Erlenmeyer flask.
The base mixture was shaken for 4 hours at 25 ° C (optimal conditions, at
room temperature and pH 6.0) [18.24] to achieve equilibrium,
respectively. Then, a certain volume of the solution was separated
from the adsorbent and the remaining concentrations of Ni (II) and Cu
(II) was determined by means of an atomic absorption spectrophotometer .
The number of metal ions absorbed by the adsorbent is calculated as
shown in the following equation:
Q = Þ ð Co-CV
W d1Th
where Q is the amount of metal ions adsorbed on the number of units of
plants adsorbent (mmol / g), C0 and C is the concentration of metal ions in
the initial concentration and equilibrium of metal ions in aqueous solution at room temperature and pH 6.0) [ 18.24] to achieve equilibrium, respectively. Then, a certain volume of the solution was separated from the adsorbent and the remaining concentrations of Ni (II) and Cu (II) was determined by means of an atomic absorption spectrophotometer . The number of metal ions absorbed by the adsorbent is calculated as shown in the following equation: Q = Þ ð Co-CV W d1Th where Q is the amount of metal ions adsorbed on the number of units of plants adsorbent (mmol / g), C0 and C is the concentration of metal ions in the initial concentration and equilibrium of metal ions in aqueous solution at room temperature and pH 6.0) [ 18.24] to achieve equilibrium, respectively. Then, a certain volume of the solution was separated from the adsorbent and the remaining concentrations of Ni (II) and Cu (II) was determined by means of an atomic absorption spectrophotometer . The number of metal ions absorbed by the adsorbent is calculated as shown in the following equation: Q = Þ ð Co-CV W d1Th where Q is the amount of metal ions adsorbed on the number of units of plants adsorbent (mmol / g), C0 and C is the concentration of metal ions in the initial concentration and equilibrium of metal ions in aqueous solution, then, a certain volume of solution Justice has been separated from the adsorbent and the remaining concentrations of Ni (II) and Cu (II) was determined by means of an atomic absorption spectroscopy. The number of metal ions absorbed by the adsorbent is calculated as shown in the following equation: Q = Þ ð Co-CV W d1Th where Q is the amount of metal ions adsorbed on the number of units of plants adsorbent (mmol / g), C0 and C is the concentration of metal ions in the initial concentration and equilibrium of metal ions in aqueous solution, then, a certain volume of solution Justice has been separated from the adsorbent and the remaining concentrations of Ni (II) and Cu (II) was determined by means of an atomic absorption spectroscopy. The number of metal ions absorbed by the adsorbent is calculated as shown in the following equation: Q = Þ ð Co-CV W d1Th where Q is the amount of metal ions adsorbed on the number of units of plants adsorbent (mmol / g), C0 and C is the concentration of metal ions in the initial concentration and equilibrium of metal ions in aqueous solution