Method for preparing modified fly ash/bentonite mixed adsorbent

Abstract

The invention discloses a method for preparing a modified fly ash/bentonite mixed adsorbent. The steps are as follows: crushing bentonite, and sieving the bentonite and fly ash through a 200 mesh sieve, adding the bentonite to sulfuric acid, performing stirring for 40 to 50 minutes, then adding the fly ash, continuing to perform stir for 40-50 min to obtain a mixture, filtering the mixture, performing washing by ultra-pure water to neutral, and performing drying at 65 to 75 DEG C for 9 to 11 h, so as to obtain the mixed adsorbent. The method has low cost and a simple process, and the preparedmodified fly ash/bentonite mixed adsorbent has good adsorption and removal effects on dimethylnaphthyl alcohol and 2-methylisoborneol and has broad market prospects.

Description

technical field [0001] The invention relates to a method for preparing a modified fly ash / bentonite mixed adsorbent. Background technique [0002] Water body odor is one of the common water environment problems, among which the musty smell produced by algae and / or actinomycetes is a problem often complained by citizens in drinking water. Among the chemicals that cause musty smell in water bodies, dimethyldecalinol (geosmin) and 2-methylisoborneol (MIB) are the most common and difficult to remove. Trace amounts of geosmin and MIB can be sensed, and the thresholds of human perception are about 4ng / L and 10ng / L respectively. Conventional water treatment processes, such as coagulation, sedimentation, and filtration, cannot effectively remove the musty smell in drinking water, and aeration can only remove part of the odor. In recent years, some studies on odor control and removal methods for drinking water and lakes have been carried out, mainly including activated carbon adsor...

AI Technical Summary

Problems solved by technology

However, the cost of using activated carbon to treat drinking water odor is very high, so it is necessary to develop new low-cost adsorbents suitable for the removal of earthy and musty odor in water treatment

Materials such as fly ash and bentonite have the characteristics of convenient use and low cost due to their abundant sources. In recent years, they have been used in many environmental applications, such as the adsorption of metal ions, phenolic compounds, pesticides and organic dyes, etc., but as adsorbents There are few reports on the removal of soil mold odor in water bodies