FU Lin1，JI Wenjin1，HE Jiajun1，HUANG Chaoqiang1，LI Yongfeng1，2，DOU Yongshen2
（1. School of Chemical Engineering and Light Industry，Guangdong University of Technology，Guangzhou 510006，China； 2. Foshan Shunde Kinglei Environment ＆ Technology Co．，Ltd．，Foshan 528308，China）
Objective Trimethylamine is a toxic， nitrogen-containing volatile organic compound， and commonly recognized as a indoor odor pollutant with pungent odor contributing significantly to external air pollution. Microbiota easily metabolizes trimethylamine pollutants，leading to the formation of trimethylamine-n-oxide，closely associated with various cardiovascular diseases.Therefore，there is an urgent need to purify indoor air from odor pollutants for people's well-being. In this paper，in order to remove trimethylamine odor pollutants，the effects of different modification methods on the adsorption and purification performance of ceramic honeycomb purification materials for trimethylamine was fully analyzed， and the goal of efficient purification of trimethylamine odor pollutants was finally achieved.
Methods A coating technology was used to directly load metal ion active coatings on ceramic honeycomb substrates to prepare integrated chemical purification materials：firstly，the ceramic honeycomb substrate underwent pretreatment，including pickling，ultrasonic，high temperature calcination；then，the pre-treated substrate was dipped into the mixed coating slurry consisting of aluminum sol，urea and metal ion salt for 10 h； finally，the coating sample was taken out，purged the residual slurry and dried at a temperature range of 100 to 200 ℃ for 10h to obtain the monolithic ceramic honeycomb purification material modified with different metal ions.The static adsorption capacity of trimethylamine was used as the evaluation index for the purification efficiency of odor pollutants，and the optimization of coating process parameters including adhesive type，concentration of added urea，thermal treatment temperature and the modification law of metal ions considering different types and concentration of metal ions，were studied in detail.
Results and Discussion The adsorption effect of pure ceramic honeycomb substrate on trimethylamine is not evident. Under the action of different adhesives modified ceramic honeycomb， the trimethylamine adsorption capacity curve illustrates that when the adhesive is aluminum sol， the modified ceramic honeycomb material exhibits the highest adsorption performance for trimethylamine，followed by silica sol and water.The adsorption performance of the modified ceramic honeycomb material for trimethylamine improved with an increase of the concentration of the pore making agent urea. However，when the concentration of the urea substance was 1. 2 mol/L，the adsorption capacity of the modified ceramic honeycomb material for trimethylamine did not show a significantly improvement. Simultaneously，at different heat treatment temperatures， the adsorption capacity of trimethylamine on ceramic honeycomb materials initially increased and then declined with the increase of temperature. At a heat treatment temperature from 120 to 150 ℃，the ceramic honeycomb material exhibits optimaladsorption performance for trimethylamine.The sequence of adsorption capacities for different metal ions，ranked fromhigh to low，is Ca2+，Fe3+，Zn2+，Cu2+ and Mg2+，respectively. The adsorption capacities of modified Ca2+ and Fe3+ ceramic honeycomb materials for trimethylamine are 368 mg/g and 341 mg/g，respectively. As the concentration of metal ions increases，the adsorption capacity of ceramic honeycomb material for trimethylamine initially rises and then declines. When the concentration of metal ions is 0.3 mol/L，the modified ceramic honeycomb material exhibits optimal adsorption performance for trimethylamine. Overall，the optimum preparation conditions for ceramic honeycomb purification materials can be selected as follows：choosing aluminum sol as the adhesive，setting the concentration of urea additive at 0. 9 mol/L，selecting a heat treatment temperature between120 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，the metal-ion-modified ceramic honeycomb purification materials，coated with aluminum sol and urea additive，significantlyimprove the adsorption capacity of trimethylamine. The adsorption capacity of trimethylamine can be increased to hundreds of times when compared to the unmodified material. Furthermore， even after thermal regeneration and repeated use of the same purification material， the decrease in the adsorption performance of trimethylamine is minimal. Additionally， upon scaling up the preparation by tenfold，the static adsorptioncapacity of the entire chemical purification material，obtained by the same preparation process for trimethylamine pollutants，remains consistent with that of the small-scale purification material.Overall，the saturation adsorption capacity of Ca2+ modified ceramic honeycomb material for trimethylamine reaches 368 mg/g. Even after repeated thermal regeneration， the purification performance of ceramic honeycomb material for trimethylamine remains unchanged. Simultaneously， the ceramic honeycomb material obtained after a tenfold enlargement of a single batch can still maintain the adsorption and purification properties of trimethylamine. These results indicates that the preparation method is simple， the adsorption properties are commendable，and the obtained ceramic honeycomb purification material has good potential for large-scale 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
Get Citation:FU L， JI W J， HE J J，et al. Preparation of honeycomb ceramics purification materials and their adsorption performance［J］.China Powder Science and Technology，2024，30（3）：170−182.
Received:2023-11-15,Revised:2023-12-18,Online:2024-04-16。
Funding Project:国家自然科学基金项目，编号：22278086。
First Author:付琳（2000—），女，硕士生，研究方向为有机污染物净化治理。E-mail：1639545624@qq. com。
Corresponding Author:李永峰（1976— ），男，教授，博士，广州市珠江科技新星，硕士生导师，研究方向为大气污染物净化治理。E-mail：gdliyf@gdut. edu. cn。
DOI:10.13732/j.issn.1008-5548.2024.03.015
CLC No:TB4；TB332 Type Code:A
Serial No:1008-5548（2024）03-0170-13
