Preparation of honeycomb ceramics purification materials and their adsorption performance
Objective Trimethylamine,a toxic,nitrogen-containing volatile organic compound,is widely recognized as an indoor odor pol-lutant,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.There-fore,there is an urgent need to purify such odor pollutants for people's well-being.In this paper,the effects of different modifi-cation 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 under-went pretreatment,including pickling,ultrasonic treatment,and high temperature calcination.Secondly,the pre-treated sub-strate 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 optimiza-tion 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 per-formance of the modified ceramic honeycomb material for trimethylamine improved with increasing concentration of the pore-making 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 trimethyl-amine 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 tri-methylamine 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 sum-mary,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 per-formance 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 large-scale production.Conclusion The ceramic honeycomb purification material,modified by metal ions during preparation,proves to be highly effective in removing odor pollutants such as trimethylamine.It offers notable advantages such as highly saturated adsorption capacity and reusability.Moreover,the ceramic honeycomb material exhibits good amplification repeatability and has the potential for large-scale production,making it well-suited for widespread application in the field of odor air purification.
purification materialtrimethylamineceramic honeycombcoating process
万方数据
维普
