The invention relates to a method for preparing an efficient, environment-friendly and functional meso-
porous silicon ball. The method is characterized by comprising the steps of stirring a
silane coupling agent and
fatty acid, which serve as double templates, and tetraethoxysilane which serves as a
silicon source, at certain temperature; and extracting the templates by using a
Soxhlet extractor, and
drying to obtain a meso-
porous silicon ball with
chromium ion adsorption functionality, wherein the grain size is about 300 nm. By introducing the
coupling agent, the meso-
porous silicon ball has the functionality,
roasting is not required for extraction of the templates, the templates can be recycled, production cost is reduced,
pollution caused by burn-off of the templates is reduced, the meso-porous
silicon ball is in accordance with a green
chemical standard, and is simple in preparation process, high in product purity and uniform in grain size, and large-scale industrial production is easily realized. The prepared meso-porous
silicon ball is quite good in
chromium ion adsorption effect particularly under the acidic condition, and requirements on treatment of acidic
industrial waste chromium water are met. Meanwhile, the meso-porous silicon ball can be cyclically utilized, and an
adsorption effect is not obviously weakened.