Study on phosphorylated Zr-doped hybrid silicas/PSF composite membranes for treatment of wastewater containing oil

Technological trends in nanosilica synthesis and utilization in advanced treatment of water and wastewater

Water and wastewater treatment applications stand to benefit immensely from the design and development of new materials based on silica nanoparticles and their derivatives. Nanosilica possesses unique properties, including low toxicity, chemical inertness, and excellent biocompatibility, and can be developed from a variety of sustainable precursor materials. Herein, we provide an account of the recent advances in the synthesis and utilization of nanosilica for wastewater treatment. This review covers key physicochemical aspects of several nanosilica materials and a variety of nanotechnology-enabled wastewater treatment techniques such as adsorption, separation membranes, and antimicrobial applications. It also discusses the prospective design and tuning options for nanosilica production, such as size control, morphological tuning, and surface functionalization. Informative discussions on nanosilica production from agricultural wastes have been offered, with a focus on the synthesis methodologies and pretreatment requirements for biomass precursors. The characterization of the different physicochemical features of nanosilica materials using critical surface analysis methods is discussed. Bio-hybrid nanosilica materials have also been highlighted to emphasize the critical relevance of environmental sustainability in wastewater treatment. To guarantee the thoroughness of the review, insights into nanosilica regeneration and reuse are provided. Overall, it is envisaged that this work's insights and views will inspire unique and efficient nanosilica material design and development with robust properties for water and wastewater treatment applications.

Optimized preparation conditions of TiO2 deposited on SiO2 solid superacid nanotubes as filler materials

TSANs were employed as novel filler materials to prepare TSANs/PSF composite membranes with MRLs, improving the integrated properties of the membranes.

Porous Zr(x)Si(1-x)O₂ shell/void/TiO₂ core particles with enhancing transfer for cleaning water

In order to immobilize TiO2 and prevent TiO2 nanoparticles from damaging polymeric supporters, the porous Zr(x)Si(1-x)O2 shell/void/TiO2 core particles (Zr-SVTs) were fabricated by the synergistic effect between nonionic surfactant P123 ((EO)20(PO)70(EO)20) and oleic acid (CH3(CH2)7CH=CH(CH2)7COOH) and cohydrolysis between TEOS and ZrOCl2·8H2O. Zr-SVTs were characterized by FT-IR, SEM, TEM, EDX and BET. The results show Zr-SVTs exhibit well-developed spherical shape with channels (approximately 5.5 nm in diameter) in porous Zr(x)Si(1-x)O2 shells. Moreover, the preparation conditions of Zr-SVTs were studied and confirmed, and the photocatalytic activity of Zr-SVTs was studied by photodegrading methyl orange in aqueous solution and oil in sewage containing oil. Alternatively, the photocatalytic activity of Zr-SVTs presents better result compared with SiO2 shell/void/TiO2 core (SVT) without doping Zr into the SiO2 shell, which further demonstrates that the Zr(x)Si(1-x)O2 shell could promote the mass transfer inside channels of Zr-SVTs. It suggests that Zr-SVTs with higher photocatalytic activity are desirable for application in water cleaning.

Photocatalytic membranes prepared by embedding porous Zr-doped SiO2 shell/TiO2 core particles with expanded channels into polyvinylidene fluoride for cleaning wastewater

Photocatalytic membranes were prepared by embedding Zr-doped SiO₂ shell/TiO₂ core particles with expanded channels into PVDF to treat wastewater.