A nanobiocatalytic membrane for a filtration system is provided which includes a filtration membrane and a plurality of nanobiocatalyst nanoparticles associated with the membrane, each of the nanobiocatalyst nanoparticles including a core, a coating at least partially surrounding the core, and a plurality of nanobiocatalysts coupled to the coating. Each of the plurality of nanobiocatalysts includes an antibacterial nanoparticle comprising bismuth, and a quorum quenching agent coupled to the antibacterial nanoparticle. A nanobiocatalyst nanoparticle for use with a water purification system is also provided. A method of forming a nanobiocatalytic membrane for a filtration system and a method of using a nanobiocatalytic membrane in a filtration system are also provided.

A piezoelectric and piezocata lytic composite material comprising M0S.sub.2 nanoflowers embedded within a body of polyvinylidene difluoride (PVDF) is provided along with layers, coatings, and sheets comprising such a material. Also disclosed are methods of using such material for generating piezoelectricity and for piezocata lytic removal of contaminants from an aqueous environment. A method of forming such material is also described.

The present disclosure relates to the field of resource-oriented utilization technologies for wastewater salt muds and more particular to a resource-oriented utilization method for a high-salt salt mud containing sodium chloride and sodium sulfate. The method includes: performing two stages of oxidation, i.e. Fenton-like treatment and chlorine dioxide treatment, in sequence on a salt mud solution, and then replacing a sodium salt with an ammonium salt to prepare a pure alkali and a mixed ammonium salt. In the method, multi-stage oxidation process is performed to effectively use ingredients such as sodium chloride and sodium sulfate so as to thoroughly eliminate organic matters and heavy metals in the high-salt salt mud, and achieve resource-oriented utilization of the salt mud, thus saving burial treatment costs, and producing good economic benefits as well as good environmental benefits.

The application belongs to the field of material preparation and environments, and specifically, to a precious metal loaded Covalent Organic Framework (COF) composite material and a preparation method therefor. The components of the composite material include precious metal nanoparticles and TpMA. The preparation method includes first mixing the TpMA, chloroauric acid and methanol; and then adding sodium borohydride for reaction, so as to obtain the composite material. The precious metal nanoparticle loaded COF material prepared in the application may be used as a catalyst, which is a novel heterogeneous catalyst with simple, green and efficient preparation; and the material is high in catalytic activity, fast in degradation rate and short in time, and may catalyze the reduction of high concentration pollutants.

The present invention is directed to systems and methods for removing trichloroethane (TCA), trichloroethene (TCE), and 1,4-dioxane (1,4-D) from contaminated water and wastewater. The system and methods relying on catalyst reduction of TCA and TCE, and the reduced products are degraded by microorganisms that are capable of biodegrading ethane and 1,4-D. In certain embodiments, a catalyst film comprises precious nanoparticles with diameters of 5-40 nm and a biofilm comprising microorganisms that are capable of degrading ethane and 1,4-D are used in a dual-reactor system to remove TCA, TCE, and 1,4-D from contaminated water and wastewater.

Provided herein are methods for creating or fabricating nanopore(s) on a membrane. The membrane is bombarded by ions, for example, C60 ions through at least one nanotunnel through a mask that is positioned on the membrane. Also provided is a two dimensional membrane with at least one nanopore thereon fabricated via these methods.

The present disclosure belongs to the technical field of sewage treatment, and relates to a preparation method and use of a cobalt nanoparticle/boron nitride composite. The preparation method includes the following steps: dissolving 2-methylimidazole and boric acid in deionized water, and stirring to obtain a solution A; dissolving Co(NO.sub.3).sub.2.Math.6H.sub.2O and Zn(NO).sub.3.Math.6H.sub.2O in deionized water, and conducting ultrasonic dispersion to obtain a solution B; transferring the solution B into the solution A, and stirring to form a clear and transparent solution; transferring the clear and transparent solution into a container lined with Teflon, and conducting a reaction; subjecting an obtained product to cooling, filtration, washing, and drying sequentially to obtain a precursor of the composite; and conducting roasting on the precursor in an ammonia gas atmosphere to obtain the cobalt nanoparticle/boron nitride composite with a spherical superstructure.

Systems, devices, and methods are presented for optimizing the formation of gas nanobubbles in a disinfecting solution. In an example system for treating contaminated water, a centrifugal pump draws the water from a reservoir and circulates the water in and through a circuit of elements including a mixing chamber in the pump, a pressure vessel, a backflow valve, a Venturi injector, and a pair of nozzles immersed in the reservoir. The system injects ozone-rich gas into the fluid to produce an aqueous solution containing a volume of gas nanobubbles. The nozzles release the gas nanobubbles into the reservoir, creating highly reactive compounds that destroy organic compounds and other contaminants in the water.

Fluid purification systems employing a monolithic composite photocatalyst to remove volatile organic compounds (VOCs) and/or pathogenic organisms are disclosed. Pairing of systems tuned to abate each of these materials are discussed in different configurations such as series and parallel, as well as combining systems to target both materials simultaneously. System configurations that allow a portion of the fluid stream to be purified are also disclosed as are configurations that allow regeneration of the photocatalyst. These features may be augmented by sensors that allow closed loop control of bypass and regeneration cycles in the systems.

A water filtration system is provided that comprises a combination of two components: silver nanoparticles immobilized on a porous carbon solid matrix and calcium carbonate silver nanoparticles. The silver nanoparticles immobilized on the porous carbon solid matrix are prepared in a one-step wet ball milling process that does not use an environmentally hazardous reducing agent or an organic stabilizer. The calcium carbonate in the calcium carbonate silver nanoparticles is preferably isolated from egg shells. The two filter components can be present in any ratio but an approximate 50:50 ratio is preferred. Also provided is an in situ method of preparing silver nanoparticles on active charcoal. Powdered activated charcoal and silver nitrate are mixed together in a mixture of ethanol and water to form a charcoal-silver nitrate solution which is then subjected to ball milling in the presence of polypropylene glycol to produce silver nanoparticles on active charcoal.