Fabrication of attapulgite/C3N4 hybridized metal organic framework nanocomposites by different strategies and study on adsorption properties for alizarin yellow GG

Attapulgite (APT) and C3N4 hybridized metal organic frameworks (MOFs) were synthesized via different strategies, and adsorption properties for alizarin yellow GG (AYGG) were studied systematically. Adsorption capacity of MIL-53-APT/C3N4-R3 synthesized by refluxing method (366.0 mg/g) was higher than that of MIL-53-APT/C3N4-H3 prepared by hydrothermal method (271.8 mg/g). Experimental data were better fitted by pseudosecond-order kinetics and Langmuir isotherm model. Due to the electrostatic shielding effect and salting-out effect, adsorption capacities of MIL-53-APT/C3N4-H3 and MIL-53-APT/C3N4-R3 were increased by 1.7 times and 1.2 times, respectively. Synthesized nanocomposites had excellent stability, reusability and regeneration. After repeating 5 cycles of adsorption and desorption, adsorption capacities of MIL-53-APT/C3N4-H3 and MIL-53-APT/C3N4-R3 could still reach 93.8% and 96.2%, respectively. Chelation, pi-pi, electrostatic interactions, hydrogen bonding and van der Waals forces were the main driving forces. Due to various advantages of simple operation, low cost and large preparation quantity, refluxing method had good application prospects in MOFs preparation.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

Attapulgite and C3N4 hybridized MOFs were synthesized using different methods, and their adsorption properties for alizarin yellow GG were systematically studied. The refluxing method resulted in higher adsorption capacity and the synthesized nanocomposites showed excellent stability and reusability.