A method for removing heavy metal sewage and its organic pollutants by modifying spherical porous silica
A porous silica, spherical technology, applied in the direction of silica, water pollutants, silica, etc., can solve the problems of low adsorption performance, unfavorable ion transmission activated carbon regeneration, low atom utilization rate, etc., and achieve large adsorption capacity Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0040] Example 1 Preparation of surface-modified spherical porous silica adsorbent
[0041] (A) Preparation of spherical porous silica:
[0042] 1) Dissolve 10.0g of polyvinyl alcohol (type 1795) in 100ml of 0.5mmol / L acetic acid aqueous solution, then add 41.6g of tetraethoxysilane dropwise, and hydrolyze for 30-60min at 0-5°C to obtain a translucent solution;
[0043] 2) Stir the translucent solution at 60-80°C for 5-6 hours to form a gel, then cool down to room temperature and let it age for 16-18 hours, and filter to obtain a gel;
[0044] 3) Put the jelly in 2mol / L ammonia solution and reflux for 2-3h, then cool down to room temperature and use 2mol / L hydrochloric acid aqueous solution to adjust the pH of the solution to neutral, ultrasonicate at 45-50°C for 2-3h, filter, filter Wash the cake with water, dry at 60-70°C to constant weight, and finally raise the temperature from room temperature to 700-800°C at a rate of 10°C / min in the air atmosphere, then heat-preserve and...
Embodiment 2
[0052] The removal rate of different heavy metals and organic matter under the different pH of embodiment 2
[0053] Since the surface-modified spherical porous silica contains hydroxyl groups and amino groups, it is affected by pH adjustment when it is chelated with heavy metals, so the present invention focuses on screening the pH conditions:
[0054] Take commercially available Pb 2+ 、Cr 3+ 、Cu 2+ 、Ni 2+ , Zn 2+ , Hg 2+ 、Cd 2+ and Co 2+ The chloride or nitrate is configured into 60-100mg / L aqueous solution with different pH values to simulate the heavy metal aqueous solution, and 2.0g of the surface-modified spherical porous silica prepared in Example 1 is added to 1L aqueous solution to test its performance under different pH environments The removal rate R, the results are shown in Table 1:
[0055] Table 1 Removal rate of heavy metal ions by surface-modified spherical porous silica at different pH
[0056]
[0057] The above test results show that the adsor...
Embodiment 3
[0058] Embodiment 3 is to the adsorption effect of arylamine and phenolic substance
[0059] Phenol, p-nitrophenol, aniline, o-nitroaniline and p-nitroaniline were formulated with water to make 100mg / L aqueous solution, and then the removal rate R value of each organic matter was tested under different pH conditions. The statistical results are shown in Table 2. Show:
[0060] Table 2 Removal rate of organic matter by surface-modified spherical porous silica at different pH
[0061]
[0062] The above results show that the surface-modified spherical porous silica prepared by the present invention has strong adsorption properties to aniline and phenolic organic pollutants, but most of them need to be used in a certain pH environment, so the actual treatment of organic pollutants When it is necessary to adjust to a specific pH range first, p-nitroaniline has a wider pH range and has a higher adsorption performance at pH=6-9.
PUM
| Property | Measurement | Unit |
|---|---|---|
| adsorption capacity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More