171results about How to "Increase the effective specific surface area" patented technology

The invention provides a horizontal type three-phase biological fluidized bed and a sewage treatment method thereof. According to the horizontal type three-phase biological fluidized bed, a water inlet and water distribution anaerobic zone, a high-load facultative biological treatment zone, a baffling zone, a low-load aerobic biological treatment zone and a settling pond are horizontally arranged from a water inlet end to a water outlet end, and moreover suspended biological stuffing layers are arranged inside other zones except the baffling zone. Sewage is fed into the water inlet and water distribution anaerobic zone, in an anaerobic environment, BOD organic maters in the wastewater are converted into a fermentation product by facultative fermentation bacteria, polymerized phosphate stored in the cells is decomposed by phosphorus-accumulating bacteria, and then the sewage is fed into the high-load facultative biological treatment zone to remove COD and nitrogen, is further fed into the low-load aerobic biological treatment zone to reduce phosphorus in the effluent, and is finally settled, clarified and filtered by the settling pond so as to obtain clean water. As all process steps are accomplished in one same horizontal pond, the land is saved, the phenomenon that equipment such as a pump and a valve is blocked when dispersed type stuffing is adopted to treat sewage is avoided, and a carrier is prevented from loss, piling or hardening.

The invention provides a method for preparing nitrogen-doped graphene with a combustion synthesis method. The method comprises steps as follows: (1) weighed magnesium powder, a solid carbon source and a nitrogen source are evenly mixed, mixed powder is obtained, and the mass ratio of the magnesium powder, the solid carbon source and the nitrogen source in the mixed power is (19.95-99):(40-79.95):(1-39.5); (2) the mixed powder obtained in Step (1) has a combustion synthesis reaction in a specific atmosphere, a reaction product is purified, and the nitrogen-doped graphene is obtained. With the adoption of the method, raw materials are wide in source, the prepared nitrogen-doped graphene is complete in sheet-like structure, good in dispersity in a solvent and large in effective specific surface area, and the nitrogen-doped graphene has the ferromagnetism through nitrogen doping.

The invention relates to a preparation method of an integral denitration catalyst with a three-dimensional hierarchical structure. The catalyst takes nickel foam as a carrier, and surface active components of the catalyst are mainly manganese oxide and nickel oxide solid solutions. The method is characterized by comprising the steps that the nickel foam serves as a substrate, and reacts with manganese ions and ammonium chloride under a hydrothermal condition; a nickel-manganese binary composite layered double hydroxide nano sheet is directly grown on the surface of the nickel foam; temperature control calcination is performed; and then the high-activity denitration catalyst is obtained. The catalyst requires no forming, and has good mass transfer and heat transfer capacity; the surface active components are the manganese oxide and nickel oxide solid solutions; a binding force between the surface active components and the carrier is higher; and aggregation or falling cannot be generated under a high temperature condition. The catalyst has a wider catalysis temperature window. Therefore, the catalyst can be used for selective catalytic reduction of nitric oxide in diesel engine tail gas and flue gas discharged by a coal-fired power plant, a steel mill and the like.