Ferreira-Neto, Elias P.
[1, 2, 3]
da Silva, Thais C. A.
Domeneguetti, Rafael R.
Perissinotto, Amanda P.
de Vicente, Fabio S.
Rodrigues-Filho, Ubirajara P.
Ribeiro, Sidney J. L.
Total Authors: 8
 Sao Paulo State Univ, Inst Chem, BR-14800060 Araraquara, SP - Brazil
 Univ Fed Mato Grosso do Sul, Inst Phys, BR-79070900 Campo Grande, MS - Brazil
 Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
 Sao Paulo State Univ, Inst Geosci & Exact Sci, Dept Phys, BR-13500970 Rio Claro, SP - Brazil
Total Affiliations: 5
ACS APPLIED MATERIALS & INTERFACES;
SEP 16 2020.
Web of Science Citations:
To address the problems associated with the use of unsupported nanomaterials, in general, and molybdenum disulfide (MoS2), in particular, we report the preparation of self-supported hybrid aerogel membranes that combine the mechanical stability and excellent textural properties of bacterial nanocellulose (BC)-based organic macro/mesoporous scaffolds with the excellent adsorption-cum-photocatalytic properties and high contaminant removal performance of MoS2 nanostructures. A controlled hydrothermal growth and precise tuning of the synthetic parameters allowed us to obtain BC/MoS2-based porous, self-supported, and stable hybrid aerogels with a unique morphology resulting from a molecular precision in the coating of quantum-confined photocatalytic MoS2 nanostructures (2-4 nm crystallite size) on BC nanofibrils. These BC/MoS2 samples exhibit high surface area (97-137 m(2).g(-1)) and pore volume (0.28-0.36 cm(3).g(-1)) and controlled interlayer distances (0.62-1.05 nm) in the MoS2 nanostructures. Modification of BC with nanostructured MoS2 led to an enhanced pollutants removal efficiency of the hybrid aerogels both by adsorptive and photocatalytic mechanisms, as indicated by a detailed study using a specifically designed membrane photoreactor containing the developed photoactive/adsorptive BC/MoS2 hybrid membranes. Most importantly, the prepared BC/Mo(S)2 aerogel membranes showed high performance in the photoassisted in-flow removal of both organic dye (methylene blue (MB)) molecules (96% removal within 120 min, K-obs = 0.0267 min(-1)) and heavy metal ions (88% Cr(VI) removal within 120 min, K-obs = 0.0012 min(-1)), separately and/or simultaneously, under UV-visible light illumination as well as excellent recyclability and photostability. Samples with interlayer expanded MoS2 nanostructures were particularly more efficient in the removal of smaller species (CrO42-) as compared to larger (MB) dye molecules. The prepared hybrid aerogel membranes show promising behavior for application in in-flow water purification, representing a significant advancement in the use of self-supported aerogel membranes for photocatalytic applications in liquid media. (AU)