C01B21/08

Removal and recovery of phosphate from liquid streams
10377653 · 2019-08-13 · ·

An economical method for recovering phosphate or phosphate and nitrogen from liquid streams. A liquid containing phosphate is introduced into a culture of autotrophic microorganisms in the presence of natural or artificial light, thereby producing a liquid effluent with elevated pH and reduced alkalinity. The alkalinity is reduced through the consumption of bicarbonate/carbonate by the autotrophic microorganisms. The effluent is then chemically treated with low-cost chemicals to provide Ca.sup.++ or Mg.sup.++ ions necessary to form a phosphate precipitate such as calcium phosphate or magnesium-ammonium-phosphate (MAP). The autotrophic microorganisms can be cultivated in ponds, lagoons, or photobioreactors. The pH of the culture is adjustable within a preferred range of 7.5 to 10.5 by adjusting the photobioreactor operation. The process includes an economical flotation separator for solid, liquid, gas separation and a means of concentrating ammonia nitrogen that may also be removed during the process of phosphate reclamation.

Method for preparation of silver azide

Described are methods of preparing silver azide comprising reacting a silver salt, an azide salt, ammonium hydroxide, and a hydrolysable ester at an elevated temperature.

Method for preparation of silver azide

Described are methods of preparing silver azide comprising reacting a silver salt, an azide salt, ammonium hydroxide, and a hydrolysable ester at an elevated temperature.

Method for producing perovskite metal oxynitride

The method for producing a perovskite metal oxynitride of the present invention, comprises: a hydrogenation step (A) of forming a perovskite oxyhydride in which an oxide ion (O2) and a hydride ion (H) coexist, by reducing a perovskite oxide through a reductive oxygen elimination reaction using a metal hydride; and a nitriding step (B) of forming a perovskite oxynitride containing a nitride ion (N3) by heat-treating the perovskite oxyhydride in the presence of a nitrogen source substance at a temperature of 300 C. or higher and 600 C. or lower and exchanging the hydride ion (H) for a nitride ion (N3).

METHOD FOR GENERATION OF NOVEL MATERIALS USING NANOSECOND-PULSED DISCHARGE PLASMA IN LIQUID PHASE
20250065290 · 2025-02-27 · ·

A method for generation of material in a liquid phase comprising a step of subjecting the liquid phase to a nanosecond-pulsed discharge plasma.