Study on the Adsorption Properties of Oxalic Acid-Modified Cordierite Honeycomb Ceramics for Neutral Red Dyes

Abstract

Removal of organic dyes from water by monolithic adsorbents is considered as an efficient and no-secondary pollution method. Herein, for the first time cordierite honeycomb ceramics (COR) treated with oxalic acid (CORA) were synthesized. This CORA exhibits outstanding removal efficiency toward the azo neutral red dyes (NR) from water. After optimizing the reaction conditions, the highest adsorption capacity of 7.35 mg·g –1 and a removal rate of 98.89% could be achieved within 300 min. Furthermore, investigation of the adsorption kinetics indicated this adsorption process could be described as a pseudo-second-order kinetic model with k 2 and q e of 0.0114 g·mg –1 ·min –1 and 6.94 mg·g –1 , respectively. According to the fitting calculation, the adsorption isotherm could also be described as the Freundlich isotherm model. The removal efficiency could be maintained above 50% after 4 cycles, negating the need for toxic organic solvent extraction, offering a method for bringing the technology one step closer to industrial application and giving CORA promising potential in practical water treatment.

Portable hydroxyl-functionalized coal gangue-based cordierite porous ceramics sheets for effective adsorption of fluorine-containing wastewater

“…ACGC exhibited an increase in large pores on some areas of its surface, while other areas transitioned from a regular and smooth shape to a rough and uneven texture, characterized by numerous pits and small particles, resulting in the formation of micropores and mesopores. 24 The findings obtained from the BET test also align with this observation. We believe that the reasons for the uneven structure of ACGC in Fig.…”

“…Additionally, ACGC-Fe exhibits a peak at 1384 cm −1 , 35 which can be attributed to the presence of residual reactant CO 3 2− in the polyhydroxy iron solution being adsorbed on ACGC-Fe. The remaining infrared peaks present in all samples consist of the absorption peak of Si–O, the symmetric stretching vibrational absorption peak of the Si–OH end group, the symmetric stretching vibrational absorption peak of the SiO 4 tetrahedron, the bending vibrational peak of Si–O–H, 24 and the Fe–O stretching vibrational peaks. 36 These peaks correspond to 1155 cm −1 , 951 cm −1 , 766 cm −1 , 677 cm −1 , and 482 cm −1 , respectively.…”

“…Research by Zhang et al 23 demonstrated that modified mullite whiskers/cordierite ceramic samples have a strong adsorption effect for Cu 2+ . Additionally, Yang et al 24 found that oxalic acid-modified cordierite honeycomb ceramics are highly efficient in removing azo neutral red dyes (NR) from water. Despite these findings, there are still few studies on fluorine adsorption by cordierite porous ceramics.…”

Modeling Tetracycline Adsorption onto Blast Furnace Slag Using Statistical and Machine Learning Approaches

“…Oxalic acid modification exhibits the capability to effectively eliminate surface impurities. Moreover, it possesses an optimal microporous and mesoporous configuration, thereby rendering it highly suitable for the intended purpose, and it also does not generate a substantial quantity of waste materials [41]. It facilitates the formation of aluminosilicate through the reaction between GGBS and an alkaline solution; further, the formation of calcium oxalate contributes to the increased surface area [32,33].…”

Preparation of Biomass Biochar with Components of Similar Proportions and Its Methylene Blue Adsorption

“…In addition, the fit of the isotherm model to the experimental data provides information about the adsorption properties. There are several equations for adsorption equilibrium data, among which the commonly used surface adsorption models for single solute systems are Langmuir [34] and Freundlich [35].…”