Metal–organic frameworks‐derived TiO₂ for photocatalytic degradation of tetracycline hydrochloride

Abstract

This work will change the common understanding that C doping of MIL‐125(Ti)‐derived TiO2 is a key factor in improving its photocatalytic performance, and it can also help to understand the internal relationship between the structure and performance of photocatalytic materials deeply. It provides a simple synthesis method for the wider application of TiO2 in the field of photocatalysis. Compared with previous studies, this article uses the titanium‐based metal‐organic framework MIL‐125(Ti) to prepare the semiconductor photocatalyst M‐TiO2 by calcination in the air at a lower temperature and shorter time. After analyzing the M‐TiO2 prepared in the experiment, the results can be received that there is no obvious agglomeration and the morphology is almost unchanged, as the frame structure does not collapse at the same time. As a result, the advantages of the large specific surface area and porousness of metal–organic frameworks (MOF) as precursor derivatives are preserved. As for the changes in the micro‐morphology, pore structure, and specific surface area of M‐TiO2 compared with the precursor, they are investigated seriatim. The results show that, compared with commercial TiO2‐P25, the performance of M‐TiO2 photocatalytic degradation of tetracycline hydrochloride is 5.7 times that of the precursor metal‐organic framework MIL‐125(Ti) and 2.2 times that of P25, and has good cycle stability.

Adsorption Properties of P-(Cm-Β-Cd/Hpcs/Kha/Ac) Hydrogel for Tetracycline Hydrochloride

“…Hydrogels are formed by chemical bonds, hydrogen bonds, van der Waals forces or physical tangles with a three-dimensional cross-networking structure [5][6][7], and contain hydrophilic groups such as hydroxyl, amide, sulfonic acid and carboxyl groups [8]. Compared with traditional adsorption materials, hydrogels have higher removal rate of antibiotic residues, convenient preparation, environmentally friendly, and excellent performance [9].…”

Adsorption properties of P-(CM-β-CD/HPCS/KHA/AC) hydrogel for tetracycline hydrochloride

“…6 shows the fitting diagram of hydrogel adsorption isotherm and adsorption thermodynamics. Langmuir (7)(8) and Freundlich (9) were fitted respectively for the isothermal adsorption in Figure 6. The adsorption isothermal parameters were obtained by combining theoretical calculation, as shown in Table 3, where Langmuir's correlation coefficient (R 2 ) was greater than Freundlich's.…”

TiO2/Zeolite Composites for SMX Degradation under UV Irradiation

“…Among them, titanium dioxide (TiO 2 ), which is a semiconductor photocatalyst, has a prominent place in photocatalysis [17], since it can decompose toxic organic pollutants in water by generating active species (•OH) with high oxidation potential. Even though TiO 2 possesses chemical stability [18], non-toxicity [19], and low cost [20], its application remains limited. The fabrication of photocatalyst (TiO 2 ) alongside a material (support) that efficiently adsorbs organic pollutants could be beneficial compared to their separate use because of the reversible transfer of intermediates [21] and reactive radicals between the photocatalyst and the support surface [22].…”