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IOP Conference Series: Earth and Environmental Science
PAPER • OPEN ACCESS
Preparation and application of a silver deodorant
To cite this article: Lin Zhang et al 2020 IOP Conf. Ser.: Earth Environ. Sci. 450 012044
View the article online for updates and enhancements.
This content was downloaded from IP address 176.9.8.24 on 07/04/2020 at 22:102nd International Conference on Air Pollution and Environmental Engineering IOP Publishing
IOP Conf. Series: Earth and Environmental Science 450 (2020) 012044 doi:10.1088/1755-1315/450/1/012044
Preparation and application of a silver deodorant
Lin Zhang1*, Shiyu Dai1, Chunbo Leng2, Zhaonan Sun1, Jingyu Zhang1
1
YingKou Insitude of Technology Department of Chemical and Enviroment
Engineering, LiaoNing Yingkou, China
2
Shanghai Jinyuan Senior High School, Shanghai, China
*Corresponding author e-mail: yklgxyzhanglin@163.com
Abstract: Based on the strong adsorption, bacteriostatic and bactericidal effects of fulvic
acid and silver ions, the preparation of silver alginate deodorizing gel with fulvic acid
and its adsorption properties for formaldehyde toxic and harmful gas were studied. In
the experiment, silver fulvate was used as the main ingredient, then sodium alginate was
used as stabilizer. Under the heating condition, the mixture of fulvic acid silver and
sodium alginate was mixed by mass ratio of 0, 0.3:1, 0.5:1, 0.7:1 and 0.9:1, and then
immersed in calcium chloride solution to form gel. The new type of silver alginate
deodorant gel was prepared and the deodorization of silver fulvate and sodium fulvate
silver alginate was prepared. The colloid was characterized. IR analysis showed that
fulvic acid was complexed with Ag+. Thermogravimetric analysis showed that the
stability of the deodorant gel was greatly improved when the mass ratio of fulvic acid
to Ag+ was 1:10.
1. Introduction
With the improvement of living standard and the importance of health, air quality has become another
focus after food safety. People have higher and higher requirement for air quality. People are disgusted
with the poisonous and harmful gases in the air, such as sweat odor, body odor, cigarette odor and
lampblack odor. In recent years, the incidence of leukemia, cancer, respiratory diseases, blood diseases,
stillbirth, malformed children, skin diseases and other diseases caused by indoor environmental quality
problems has increased year by year [1-3]. Therefore, a variety of deodorants such as refrigerator
deodorant, toilet deodorant, air freshener and so on have been listed, and the market scale has gradually
increased. At home and abroad, the research of deodorant has always been the focus of research, and
the safe, efficient and multi-functional deodorant is the focus of the development of deodorant in the
future.
At present, there are kinds of deodorants on the market. Most of the products are mainly oxidized
and bactericidal. Their bactericidal effects are strong enough to eradicate the spoilage bacteria that
produce odor, but it is difficult to remove the odor that has been produced in the air. Therefore, the
deodorizing effect of these deodorants is not ideal. In addition, there are other products on the market,
such as essence, plant extracts, etc. The odor molecules in the air can be dissolved and adsorbed, but it
is difficult to achieve the purpose of killing putrefactive bacteria, so its deodorization effect is poor in
durability; two different deodorization methods can not achieve effective deodorization [4-5]. In
addition, there are many kinds of air deodorant at home and abroad. Solid dosage forms can be divided
into paste type and granule type. Liquid preparations can be classified into volatile and spray type.
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution
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Published under licence by IOP Publishing Ltd 12nd International Conference on Air Pollution and Environmental Engineering IOP Publishing
IOP Conf. Series: Earth and Environmental Science 450 (2020) 012044 doi:10.1088/1755-1315/450/1/012044
Therefore, according to the above data, deodorant has a great prospect. Therefore, a new type of silver
deodorant gel was prepared. The gel was prepared by using silver fulvate as the main component and
adding sodium alginate as stabilizer. It combines the advantages of silver ion bacteriostasis and
sterilization, the selective characteristics of fulvic acid, which is known as the "gold substance", and the
ability of inhibiting or supplementing the immune response of the body, so as to achieve the real
elimination of aldehydes, bacteria and peculiar smell.
2. Experimental
2.1. Preparation technology of silver fulvic acid alginate gel
Weigh 5 parts of sodium alginate with a mass of 2G by electronic balance; then prepare 100 mL of
calcium chloride solution with a concentration of 1%; then measure 100 mL of distilled water in a
measuring cylinder and pour it into a 250 mL beaker, place the beaker in an intelligent glass constant
temperature water bath and heat it to 80 ℃, then slowly according to different mass ratios (the mass
ratio of silver fulminate to sodium alginate is 0, 0.3:1, 0.5:1, 0.7:1, 0.9:1) Add the mixture of sodium
alginate and silver fulvic acid, mix with each other under the condition of ultrasonic and high-speed
agitation. After the mixture is completely dissolved (10 min) to form a uniform viscous liquid, pave the
viscous liquid in rubber boxes of different specifications into a thickness of about 2 mm, soak it in 100
mL of 1% calcium chloride solution for 10 min, then rinse it with water for 5 min, remove the residual
calcium chloride, and seal it for preservation, then obtain Silver fulvate alginate gel.
3. Result and Disscussion
3.1. Infrared spectrum analysis of FA-Ag series deodorant gel
Figure 1. Infrared spectrum of FA-Ag series deodorant gel
As shown in Figure 1, a sharp strong peak appears near 1350 cm-1 in FA-Ag series deodorant gel. A
broad weak band appears near 1600 cm-1. According to relevant data, the reason for this change should
be the reaction between FA molecules and Ag+. It can be concluded from the relevant literature that the
1350 cm-1 and 1600 cm-1 bands of FA-Ag series deodorant gel are all C=O and 1600 cm-1 belong to the
metal coordination COO- stretching vibration band, which proves that FA molecules combine with Ag+
through complexation.
22nd International Conference on Air Pollution and Environmental Engineering IOP Publishing
IOP Conf. Series: Earth and Environmental Science 450 (2020) 012044 doi:10.1088/1755-1315/450/1/012044
3.2. Infrared spectrum analysis of sodium alginate
Figure 2. Infrared spectrum of sodium alginate
According to Figure 2, the characteristic peak of sodium alginate is analyzed; the absorption peak of
1600 cm-1 is the narrow peak caused by asymmetric stretching vibration, and the absorption peak of
1400 cm-1 is the narrow peak caused by C-O stretching vibration. In addition, due to the stretching
vibration of C-, a wide absorption peak appears at 3650 ~ 3200 cm-1.
3.3. Infrared spectrographic analysis of sodium fulvate alginate gel
Figure 3. Infrared spectrogram of silver alginate gel
A comparison between Figure 3 and Figure 2 showed that a broad absorption peak appeared at 1600
cm-1 in the alginate gel, because the interaction between COO- group and Ag+ in sodium alginate
occurred. Similarly, due to the interaction between fulvic acid and sodium alginate, the small absorption
peak near 1050 cm-1 disappeared. Combined with the above results, it can be shown that silver and
sodium alginate can act as physical bonds, so the silver alginate gel prepared in this paper is a physical
gel.
32nd International Conference on Air Pollution and Environmental Engineering IOP Publishing
IOP Conf. Series: Earth and Environmental Science 450 (2020) 012044 doi:10.1088/1755-1315/450/1/012044
3.4. Thermogravimetric analysis of FA-Ag series deodorant gel
100
95
90
85
80
75
Weight(%)
70 1
65 :
60 3
55
50
0 100 200 300
Temprature(℃)
Figure 4. Thermogravimetric analysis of FA-Ag series deodorant gel
As can be seen from Figure 4, the thermo gravimetric curve of FA-Ag series deodorant gel is
obviously different from that of FA, and the thermal weightlessness rate of FA is much higher than that
of FA-Ag deodorant gel. The results show that FA and Ag+ react with FA under the experimental
conditions to form FA silver complex. The stability of the FA-Ag complex deodorant gel is about 5%-
10% when the temperature rises to the same temperature, such as 250 ℃, which is much lower than
that of FA about 35%. For FA-Ag series deodorant gel, the thermal decomposition temperature increases
with the increase of Ag+ content. When the temperature increased to 250 ℃, the mass loss of FA-Ag
(1:3) deodorant gel was 12.50%, while the FA-Ag (1:10) deodorant gel weighed only 6.14%. This is
because with the increase of Ag+ content in the reaction, the single FA molecule can be complexed with
more Ag+, thus improving the stability of deodorant gel. The weight loss rate of FA-Ag series deodorant
gel is slow at the beginning of heating. When the temperature rises to 150 ℃, the weight loss is fast.
Compared with the FA molecular weight loss curve, it can be seen that the decomposition of FA
molecule is mainly occurred before 150 ℃, and the complex reaction between FA and Ag+ occurs after
150 ℃.
3.5. Determination and result analysis of formaldehyde content
Figure 5. Change of formaldehyde gas content
42nd International Conference on Air Pollution and Environmental Engineering IOP Publishing
IOP Conf. Series: Earth and Environmental Science 450 (2020) 012044 doi:10.1088/1755-1315/450/1/012044
As can be seen from Figure 5, for all the gels of silver fulvate and sodium alginate, they get a certain
adsorption on formaldehyde, and the adsorption effect is basically stable after 10 min. However, the
adsorption effect of the gel added with silver fulvic acid is much stronger than that of the gel without
adding silver fulvate. When the adsorption time reaches 50 min, the addition of fulvic acid silver alginate
is added. The content of formaldehyde in the beaker of the gum reduced to 0.1 mg/L on average. When
the mass ratio of fulvic acid to sodium alginate was 0.9:1, the adsorption effect on formaldehyde reached
10 times that of the silver rich gel, and the formaldehyde content was reduced to 0.05 mg/L. With the
increase of the ratio of silver fulvic acid in the gel, its adsorption effect on formaldehyde became more
and more obvious. In the beaker of granular activated carbon, the content of formaldehyde gas also
decreased obviously, and finally stabilized at about 0.1 mg/L. However, compared with 0.05 mg/L of
silver alginate gel, it is obvious that granular activated carbon has poor adsorption.
4. Conclusion
The performance of silver fulvate silver and sodium alginate deodorant gel was characterized
respectively. IR analysis showed that fulvic acid was complexed with Ag+. Thermogravimetric analysis
showed that the stability of the deodorant gel was greatly increased when the mass ratio of fulvic acid
to Ag+ was 1:10, and adsorption properties showed that when the ratio of silver fulvate to sodium
alginate was 0.9:1, the adsorption capacity was higher. The best way is to reduce the formaldehyde gas
content from 0.299mg/L to 0.05mg/L, reduce the odor content of garlic paste from 9.999mg/L to
1.365mg/L, reduce the gas content of stinky tofu from 9.999mg/L to 2.966mg/L, and for the same quality
of silver rich alginate gel and granular activated carbon, the adsorption property of silver fulvic acid
alginate gel is obviously better than granular activated carbon.
References
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fulminate [P]
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[3] Zhang Lin, Zhu Baowei, Du Guofeng, Yuan Lei, Fu Xiaowei, Li siqun, Yao Sinan. Synthesis and
antibacterial properties of silver loaded fulvic acid antibacterial agents [J]. Contemporary
chemical industry, 2017,46 (03): 446-448
[4] Liu Cui. Synthesis and characterization of sodium alginate silver nanoparticles [J]. Journal of
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