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Biochar-loaded nano zero-valent iron material and application thereof

A technology of nano-zero-valent iron and biochar, which is applied in the direction of water pollutants, other chemical processes, gaseous effluent wastewater treatment, etc., can solve the problems that nano-zero-valent iron is easy to agglomerate and difficult to separate, so as to improve adsorption efficiency and improve efficiency effect

Active Publication Date: 2019-12-20
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The new material based on the method of biochar dispersing nano-zero-valent iron provides a new method for the removal of many pollutants in water, and overcomes the traditional problem of nano-zero-valent iron when purely using nano-zero-valent iron. Defects that iron is easy to agglomerate and difficult to separate

Method used

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  • Biochar-loaded nano zero-valent iron material and application thereof
  • Biochar-loaded nano zero-valent iron material and application thereof
  • Biochar-loaded nano zero-valent iron material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Crush the washed and dried rice straw and pass through a 100-mesh sieve to obtain rice straw powder;

[0035] 2. Soak the rice straw powder with 0.5mol / L hydrochloric acid and stir it at a constant speed for 8 hours. The solid-to-liquid ratio is 1:50. Wash it with ultrapure water until the filtrate is neutral, then put it in a drying oven, and dry it at 105°C for 12 hours. Obtain modified rice straw powder;

[0036] 3. First raise the temperature of the pyrolysis furnace to 500°C, and at the same time feed nitrogen gas into the pyrolysis furnace, so that the pyrolysis furnace is in a nitrogen atmosphere, then weigh 5g of modified rice straw powder and place it in the pyrolysis furnace, and then add 2 The temperature is raised to 700°C at the rate of ℃ / min, and then cooled to room temperature to obtain biochar;

[0037] 4. Soak the biochar with 1mol / L hydrochloric acid and stir it at a constant speed for 24 hours. The solid-to-liquid ratio is 1:50. Wash it with ultra...

Embodiment 2

[0041] 1. Crush the washed and dried rice straw and pass through a 100-mesh sieve to obtain rice straw powder;

[0042] 2. Soak the rice straw powder with 15wt% hydrogen peroxide hydrochloric acid and stir it at a constant speed for 8 hours. The solid-to-liquid ratio is 1:50. Wash it with ultrapure water until the filtrate is neutral, then put it in a drying oven, and dry it at 105°C for 12 hours. Obtain modified rice straw powder;

[0043] 3. First raise the temperature of the pyrolysis furnace to 500°C, and at the same time feed nitrogen gas into the pyrolysis furnace, so that the pyrolysis furnace is in a nitrogen atmosphere, then weigh 5g of modified rice straw powder and place it in the pyrolysis furnace, and then add 2 The temperature is raised to 700°C at the rate of ℃ / min, and then cooled to room temperature to obtain biochar;

[0044] 4. Soak the biochar with 30wt% hydrogen peroxide and stir it at a constant speed for 24 hours. The solid-to-liquid ratio is 1:50. Wash...

Embodiment 3

[0048] 1. Crush the washed and dried rice straw and pass through a 100-mesh sieve to obtain rice straw powder;

[0049] 2. Soak the rice straw powder with 0.5mol / L sodium hydroxide and stir at a constant speed for 8 hours. The solid-to-liquid ratio is 1:50. Wash with ultrapure water until the filtrate is neutral, then put it in a drying oven, and dry it at 105°C 12h, obtain the modified rice straw powder;

[0050] 3. First raise the temperature of the pyrolysis furnace to 500°C, and at the same time feed nitrogen gas into the pyrolysis furnace, so that the pyrolysis furnace is in a nitrogen atmosphere, then weigh 5g of modified rice straw powder and place it in the pyrolysis furnace, and then add 2 The temperature is raised to 700°C at the rate of ℃ / min, and then cooled to room temperature to obtain biochar;

[0051] 4. Soak the biochar with 1mol / L sodium hydroxide and stir it at a constant speed for 24 hours. The solid-to-liquid ratio is 1:50. Wash it with ultrapure water un...

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Abstract

The invention discloses a biochar-loaded nano zero-valent iron material and an application thereof. A preparation method of the zero-valent iron material comprises the steps: 1, crushing biomass, andcarrying out primary chemical modification to obtain modified biomass; 2, in a nitrogen atmosphere, firstly heating a pyrolyzing furnace to 450-550 DEG C, then putting the modified biomass into the pyrolyzing furnace, pyrolyzing, and then heating to 650-750 DEG C at an average speed of 2-3 DEG C / min to obtain biochar; 3, carrying out deep chemical modification on the biochar to obtain modified biochar; 4, uniformly mixing absolute ethyl alcohol, ferrite, ultrapure water and the modified biochar to obtain a suspension; and 5, in a nitrogen atmosphere, dropwise adding a reducing agent into the suspension to reduce ferrous ions, and after dropwise adding is completed, carrying out an aging reaction for 0.5-1 h to obtain the biomass-loaded nano zero-valent iron material. The zero-valent iron material is prepared by adopting modification and variable-temperature calcination modes, so that the performance of the zero-valent iron material is greatly improved, the zero-valent iron material canbe used for removing selenium elements in desulfurization wastewater, and the removal effect on selenite is mainly better.

Description

technical field [0001] The invention belongs to the technical field of material preparation and water treatment, and in particular relates to a biochar-loaded nanometer zero-valent iron material and its application. Background technique [0002] Selenium is a trace element required by organisms, and is one of the important components to maintain normal life activities of organisms. However, once the organism takes in excess selenium, the health of the organism will be damaged, causing certain diseases and even death. [0003] Relevant investigations and studies in the past ten years have shown that in desulfurization wastewater from coal-fired power generation and some industrial and agricultural wastewater, the content of selenium far exceeds the average level in nature, and it is finally enriched in the human body under the action of bioaccumulation. affect people's health and quality of life. And even the selenium element content in the water body that the selenium cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F103/18C02F101/10
CPCB01J20/02B01J20/20C02F1/283C02F2101/106C02F2103/18
Inventor 易宝军雷陈澳吴允连刘欣朱瑶袁巧霞
Owner HUAZHONG AGRI UNIV
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