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Method for preparing compound adsorbent by utilizing agricultural wastes

A technology for agricultural waste and composite adsorption, which is applied in the field of preparation in the field of environmental protection, can solve the problems of high cost of adsorbent preparation, cumbersome process, etc., and achieve the effects of low cost, simple process and good effect.

Inactive Publication Date: 2010-06-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation cost of the adsorbent is relatively high and the process is cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1, take the rice husk, grind it and add it to 0.01mol / L CaCl 2 in an aqueous solution, vacuum impregnated for 12 hours, filtered, put into an oven and dried at 80°C to obtain a solid substance;

[0022] Step 2, put the solid substance obtained in step 1 into 0.5mol / L K 2 CO 3 solution, vacuum impregnated for 5 hours, then dried the sample, then put it into a vacuum sintering furnace, raised the temperature to 700°C at a rate of 5°C / min, and held it for 1 hour.

[0023] Implementation Effect:

[0024] The specific surface area of ​​the composite adsorbent obtained in this example is 825.2m 2 / g, the average pore diameter is 2.3nm. Taking 0.02g of composite adsorbent can reduce the phosphorus concentration in the solution to 0.049ppm after absorbing 100mL solution with a phosphorus concentration of 5ppm by shaking.

Embodiment 2

[0026] Step 1, take the bamboo leaves, crush them and add them to 0.15mol / L Ca(CH 3 COO) 2 in an aqueous solution, vacuum impregnated for 24 hours, filtered, put into an oven and dried at 180°C to obtain a solid substance;

[0027] Step 2, put the solid substance obtained in Step 1 into a solution of 1.5mol / L NaOH, vacuum impregnate for 30 hours, then dry the sample, then put it into a vacuum sintering furnace, raise the temperature to 850°C at a rate of 10°C / min, and keep it warm 3 hours.

[0028] Implementation Effect:

[0029] The specific surface area of ​​the composite adsorbent obtained in this example is 1007.8m 2 / g, the average pore diameter is 2.2nm. Taking 0.02g of composite adsorbent can reduce the phosphorus concentration in the solution to 0.034ppm after 100mL solution with a phosphorus concentration of 10ppm is adsorbed by shaking.

Embodiment 3

[0031] Step 1, take the bean stalk, grind it and add it to 0.2mol / L Ca(HCO 3 ) 2 in the aqueous solution, vacuum impregnated for 48 hours, filtered, put into an oven and dried at 120°C to obtain a solid substance;

[0032] Step 2, put the solid substance obtained in step 1 into 3mol / L ZnCl 2 solution, vacuum impregnated for 25 hours, then dried the sample, then put it into a vacuum sintering furnace, raised the temperature to 1000°C at a rate of 15°C / min, and kept the temperature for 5 hours.

[0033] Implementation Effect:

[0034] The specific surface area of ​​the composite adsorbent obtained in this example is 907.8m 2 / g, the average pore diameter is 2.2nm. Taking 0.02g of composite adsorbent can reduce the phosphorus concentration in the solution to 0.044ppm after absorbing 100mL solution with a phosphorus concentration of 15ppm by shaking.

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Abstract

The invention discloses a method for preparing a compound adsorbent by utilizing agricultural wastes in the field of environmental protection, which comprises the following steps of: 1, taking the agricultural wastes, then placing the agricultural wastes into aqueous solution of soluble calcium salt, performing vacuum impregnation, filtering the obtained solution, and drying a precipitate to obtain a solid substance; and 2, placing the solid substance obtained in the step one into solution, performing vacuum impregnation, filtering the obtained solution, drying a precipitate, and performing high-temperature sintering on the precipitate in vacuum to obtain the compound adsorbent, wherein the solution is aqueous solution of strong base of monovalent metal, aqueous solution of carbonate of the monovalent metal or aqueous solution of strong acid salt of zinc. The method has the advantages of low cost and simple process; and the prepared compound adsorbent is good in phosphorus removal effect, quick in speed and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method in the field of environmental protection, in particular to a method for preparing a composite adsorbent by using agricultural waste. Background technique [0002] Lakes in our country are seriously polluted, and more than 50% of them are in the state of eutrophication. Eutrophication refers to the excess of nutrients (generally referring to compounds containing nutrients nitrogen and phosphorus) in lakes, reservoirs, slow-flowing rivers and some coastal waters under the influence of human activities. The massive growth of plants (such as algae and large plants) in eutrophic water consumes a large amount of dissolved oxygen, causing a sharp decrease in the dissolved oxygen content of the water, leading to deterioration of water quality and even affecting the ecological balance. In natural water bodies, phosphorus is more likely to accumulate and cause pollution than nitrogen. Controlling the phosphorus cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/32B01J20/24C02F1/28
Inventor 郭萃萍黄大成丁剑曹玮张从发朱鹏波范同祥张荻
Owner SHANGHAI JIAO TONG UNIV
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