Fabrication of a waste disposable facial cleansing tissue-based MIL-100 (Fe)/MoS2 nanosystem for simultaneous removal of Reactive Brilliant Blue and Cr(VI) from water

Reactive Brilliant Blue (KN-R) and hexavalent chromium (Cr(VI)) are two types of environmental pollutants that can be simultaneously released into the environment through industrial wastewater and domestic sewage, leading to severe combined pollution. Therefore, the simultaneous and effective removal of both KN-R and Cr(VI) is a critical challenge to reduce their environmental impacts. In this work, a waste disposable facial cleansing tissue (DFCT)-based nanosystem was fabricated to simultaneously remove KN-R and Cr(VI) from water. This nanosystem, called DFCT/MIL-100(Fe)/MoS2, incorporated polyhedral MIL-100(Fe) and flower-shaped MoS2 onto the DFCT surface. MoS2 exhibited high reduction and adsorption capabilities for Cr(VI), while MIL-100(Fe) possessed high adsorption abilities for KN-R through chelation. Moreover, DFCT had excellent immobilization capacity for both MIL-100(Fe) and MoS2, making it convenient for DFCT/MIL-100(Fe)/MoS2 to be removed from water after treating KN-R and Cr(VI). The maximum removal efficiencies of DFCT/MIL-100(Fe)/MoS2 for KN-R and Cr(VI) could reach 96.4 % and 97.9 % in 13 h and 5 h, respectively. The removal process fit the Langmuir (R2 = 0.9956 of KN-R and R2 = 0.9976 of Cr(VI)) and pseudo-second-order kinetic models (R2 = 0.9876 of KN-R and R2 = 0.9922 of Cr(VI)). Thermodynamic data indicated that the removal process of KN-R and Cr(VI) was spontaneous and endothermic. Furthermore, pot experiments result demonstrated that DFCT/MIL-100(Fe)/MoS2 could reduce the harm of KN-R and Cr(VI) for water spinach and enhance the food safety. This work presents a valuable method for remediating KN-R/Cr(VI)-contaminated water with significant application potential.