(1. 广东工业大学 轻工化工学院,广东 广州 510006;2. 佛山市顺德区金磊环保科技有限公司,广东 佛山 528308)
付琳,姬文晋,何家俊,等. 陶瓷蜂窝净化材料的制备及吸附性能[J]. 中国粉体技术,2024,30(3):170-182.
Objective Trimethylamine, a toxic, nitrogen-containing volatile organic compound, is widely recognized as an indoor odor pollutant, with its pungent odor significantly contributing to external air pollution. Microbiota can easily metabolize trimethylamine
pollutants, leading to the formation of trimethylamine-n-oxide, which is closely linked to various cardiovascular diseases. Therefore, there is an urgent need to purify such odor pollutants for people's well-being. In this paper, the effects of different modification methods on the adsorption and purification performance of ceramic honeycomb purification materials for trimethylamine
was thoroughly analyzed, ultimately aiming to achieve efficient purification of trimethylamine odor pollutants.
Methods A coating technology was used to directly apply metal ion active coatings onto ceramic honeycomb substrates, forming
integrated chemical purification materials. The process involved several steps: Firstly, the ceramic honeycomb substrate underwent pretreatment, including pickling, ultrasonic treatment, and high temperature calcination. Secondly, the pre-treated substrate was immersed into the mixed coating slurry containing aluminum sol, urea and metal ion salt for 10 h. Finally, the coating
sample was extracted, residual slurry was purged, and then the sample was dried within a temperature range of 100 to 200 ℃ for
10 h to obtain the monolithic ceramic honeycomb purification material modified with different metal ions. The static adsorption
capacity of trimethylamine was employed as the evaluation index for the purification efficiency of odor pollutants. The optimization of coating process parameters, including adhesive type, concentration of added urea, thermal treatment temperature, and the
modification of metal ions, was comprehensively examined, taking ino account different types and concentrations of metal ions.
Results and Discussion The adsorption capability of the pure ceramic honeycomb substrate for trimethylamine was not promi nent. However, upon modification with different adhesives, the trimethylamine adsorption capacity curve revealed that materials
modified with aluminum sol exhibited the highest adsorption performance, followed by silica sol and water. The adsorption performance of the modified ceramic honeycomb material for trimethylamine improved with increasing concentration of the poremaking agent urea. However, at a urea concentration of 1. 2 mol/L, there was no significant improvement in the adsorption
capacity of the modified ceramic honeycomb material for trimethylamine. Additionally, the adsorption capacity of trimethylamine on ceramic honeycomb materials initially increased and then declined with the increase of heat treatment temperature. At
a heat treatment temperature from 120 to 150 ℃, the ceramic honeycomb material exhibited optimaladsorption performance for
trimethylamine. The sequence of adsorption capacities for different metal ions, ranked from highest to lowest, was Ca2+, Fe3+,
Zn2+, Cu2+
and Mg2+, respectively. The adsorption capacities of modified Ca2+
and Fe3+
ceramic honeycomb materials for trimethylamine were 368 mg/g and 341 mg/g, respectively. As the concentration of metal ions increased, the adsorption capacity
of ceramic honeycomb material for trimethylamine initially rose and then declined. When the concentration of metal ions was
0.3 mol/L,the modified ceramic honeycomb material exhibited optimal adsorption performance for trimethylamine. In summary, the optimum preparation conditions for ceramic honeycomb purification materials can be determined as follows:choosing
aluminum sol as the adhesive, setting the concentration of urea additive at 0.9 mol/L,selecting a heat treatment temperature
between 120 and 150 ℃, using Ca2+ and Fe3+
as metal ion additives, and maintaining a concentration of metal ion additive at
0. 3 mol/L.
Compared to pure ceramic honeycomb materials,metal-ion-modified ceramic honeycomb purification materials, coated
with aluminum sol and urea additive, exhibited a significan enhancement in the adsorption capacity of trimethylamine. The
adsorption capacity of trimethylamine could increase by hundreds of times compared to the unmodified material. Furthermore,
even after thermal regeneration and repeated use of the same purification material, the decrease in trimethylamine adsorption performance was minimal. Additionally, upon scaling up the preparation by tenfold, the static adsorption capacity of the entire
chemical purification material, obtained by the same preparation process for trimethylamine pollutants, remained consistent with
that of the small-scale purification material. Overall, the saturation adsorption capacity of Ca2+
modified ceramic honeycomb
material for trimethylamine reached 368 mg/g. Even after repeated thermal regeneration, the purification performance of ceramic
honeycomb material for trimethylamine remained unchanged. Simultaneously, the ceramic honeycomb material obtained after a
tenfold enlargement of a single batch could still maintain the adsorption and purification properties of trimethylamine. These
results indicate that the preparation method is simple, the adsorption properties are commendable, and the obtained ceramic
honeycomb purification material has significant potential for largescale production.
Conclusion The as-prepared ceramic honeycomb purification material modified by metal ions proves to behighly effective in removing odor pollutants such as trimethylamine. Itboaststhe advantages such as high saturated adsorption capacity and the ability for repeated use. Moreover,the ceramic honeycomb material has good amplification repeatability and has the potential of large-scale production,allowing it well-suited for widespread application in the field of odor air purification.
Keywords:purification material;trimethylamine;ceramic honeycomb;coating process
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