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Dissolved organic matter impregnated biochar efficient in adsorbing heavy metal ions Cd2+ and preparation method and application thereof

A technology for the adsorption of dissolved organic matter and heavy metals, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of cumbersome preparation steps, etc., and achieve the effect of abundant resources, efficient adsorption and removal, and wide sources

Active Publication Date: 2017-06-13
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (ZL201110215779.5) prepared activated carbon-persimmon tannin composite adsorbent for Cd in water 2+ removal, but its preparation steps are cumbersome, and it is more effective than activated carbon alone for Cd 2+ The adsorption capacity of the

Method used

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  • Dissolved organic matter impregnated biochar efficient in adsorbing heavy metal ions Cd2+ and preparation method and application thereof
  • Dissolved organic matter impregnated biochar efficient in adsorbing heavy metal ions Cd2+ and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The method for preparing humic acid impregnated biochar:

[0030] (1) Put the dried and ground palm shell biomass raw material into an electric furnace, and calcine it with nitrogen gas at 400°C for 3 hours, wash the obtained biochar product with distilled water for 3 times, dry it at 80°C, grind Finely pass through a 100-mesh sieve to obtain biochar for subsequent use, and its electron microscope picture is as follows figure 1 as shown in (a);

[0031] (2) Humic acid is formulated into a humic acid aqueous solution of 1.0 g / L, and the pH is adjusted to 5.0 with hydrochloric acid of 0.1 mol / L and sodium hydroxide of 0.1 mol / L simultaneously;

[0032] (3) Add biochar to the humic acid aqueous solution to make a mixed solution with a mass concentration of biochar of 10g / L, and stir or shake the mixed solution for 7 days;

[0033] (4) After stirring or shaking, the liquid phase is removed by centrifugation or filtration, and the residual solid is freeze-dried in a freeze...

Embodiment 2

[0037] The method for preparing humic acid impregnated biochar:

[0038] (1) Put the dried and ground palm shell biomass raw material into an electric furnace, and calcine it with nitrogen gas at 400°C for 3 hours, wash the obtained biochar product with distilled water for 3 times, dry it at 80°C, grind Finely pass through a 100-mesh sieve to obtain biochar for subsequent use;

[0039] (2) Humic acid is formulated into a 2.0g / L humic acid aqueous solution, and the pH is adjusted to 5.0 with 0.1mol / L hydrochloric acid and 0.1mol / L sodium hydroxide;

[0040] (3) Add biochar to the humic acid aqueous solution to make a mixed solution with a mass concentration of biochar of 10g / L, and stir or shake the mixed solution for 7 days;

[0041] (4) After stirring or shaking, the liquid phase is removed by centrifugation or filtration, and the residual solid is freeze-dried in a freeze dryer to obtain humic acid-impregnated biochar.

[0042] Adsorption of Cd by biochar impregnated with ...

Embodiment 3

[0045] Method for preparing tannic acid impregnated biochar:

[0046] (1) Put the dried and ground palm shell biomass raw material into an electric furnace, and calcine it with nitrogen gas at 400°C for 3 hours, wash the obtained biochar product with distilled water for 3 times, dry it at 80°C, grind Finely pass through a 100-mesh sieve to obtain biochar for subsequent use;

[0047] (2) Tannic acid is mixed with the tannic acid aqueous solution of 5.0g / L, regulates pH to be 5.0 with the hydrochloric acid of 0.1mol / L and the sodium hydroxide of 0.1mol / L simultaneously;

[0048] (3) Add biochar to the tannic acid aqueous solution to make a mixed solution with a mass concentration of biochar of 10 g / L, and stir or vibrate the mixed solution for 7 days;

[0049] (4) After stirring or shaking, the liquid phase was removed by centrifugation or filtration, and the residual solid was freeze-dried in a freeze dryer to obtain tannic acid-impregnated biochar. Its electron microscope pi...

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Abstract

The invention discloses dissolved organic matter impregnated biochar efficient in adsorbing heavy metal ions Cd2+ and a preparation method and application thereof; the dissolved organic matter impregnated biochar is prepared by supporting dissolved organic matters on the surface of biochar under Pi-Pi interaction, polar interaction and hydrogen bond and pore filling mechanism. The DOM (dissolved organic matter) impregnated biochar prepared herein is an environment-friendly adsorbent efficient in treating Cd2+-containing wastewater at low cost, and is significantly better than biochar modified via other methods and non-modified biochar in terms of Cd2+ ion adsorbing capacity; the capacity of adsorbing Cd2+ in aqueous solutions is 51.1% and above higher than that of non-impregnated biochar; in addition, the preparation method according to the invention is simple, has no need for adding other chemicals or organic solvents, has an environment-friendly process, has no need for complex chemical reactions, special equipment and severe reaction conditions, and accordingly is easy for industrial production.

Description

technical field [0001] The invention relates to adsorbable biochar, in particular to an efficient adsorption of heavy metal ions Cd 2+ Preparation method and application of dissolved organic matter impregnated biochar. Background technique [0002] Biochar is a carbon-rich organic substance formed by pyrolysis of biomass (below 700 °C) under anoxic or anaerobic conditions. Many biomasses including agricultural and forestry wastes, fecal matter and sludge can be used to make biochar. At present, biochar has extremely high application prospects in the fields of carbon sequestration, soil nutrient conservation, crop yield increase, degraded soil remediation, contaminated soil and sediment treatment, and water pollution remediation. Due to its low production cost and good adsorption capacity for organic pollutants and heavy metal ions, biochar is considered to be a new type of environmentally friendly material that can be widely used in environmental governance and agricultura...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/22C02F1/288C02F2101/20
Inventor 魏巍李一鸣邵懿吴星悦李林源韩睿明李时银
Owner NANJING NORMAL UNIVERSITY
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