Method for recycling of silica waste and method for preparing nanoporous or spherical materials

摘要

Disclosed are a method for recycling silica waste and a method for preparing nanoporous material and other valuable silica materials. More specifically, a method for preparing a nanoporous material by recycling silica-containing waste produced from a silica etching process in the synthesis of nanoporous carbon is provided. The present disclosure allows recycling of silica waste in an effective and environment-friendly manner, reduction of consumption of chemical materials, and reduction of chemical waste. Accordingly, the present disclosure enables effective preparation of various valuable nanoporous silica and other silica materials from silica waste released for production of various nanoporous materials.

主权项

1. A method for preparing nanoporous or spherical material, comprising:
preparing a silica precursor having a reduced carbon content comprising less than 0.3 wt. % of carbon by purifying a silica waste produced from a silica etching process in the synthesis of nanoporous carbon, said silica waste comprising an initial carbon content comprising greater than 0.3 wt. % of carbon; and introducing the silica precursor into a surfactant micelle as a structure-directing agent; wherein the nanoporous or spherical material is selected from mesoporous silica, microporous zeolite and silica spheres, wherein the purification of silica waste comprises subjecting the silica waste to filtration and sonication, and wherein the silica precursor has a weight ratio of silica (SiO2) to sodium oxide (Na2O) from 2.31 to 2.36 and a pH of approximately 12.