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Method for treating heavy metal waste liquid by using modified walnut shell biochar

A walnut shell and biochar technology, applied in water/sewage treatment, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low activity, large specific surface area, and many internal channels, and achieve the reduction of metal ion content, Increase the specific surface area and realize the effect of recycling

Inactive Publication Date: 2019-03-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As a kind of agricultural and forestry waste, walnut shell can be widely used as a good adsorbent because of its rich oxygen-containing functional groups, high hardness, small gray scale, many internal channels and large specific surface area. Remove dyes, heavy metal ions and other pollutants in water, but the current method of use is relatively simple, which cannot solve the shortcomings of poor adaptability and low activity that often occur in the adsorption process of natural biological materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take fresh walnut shells, soak them in clean water to wash away the sediment on the surface, crush them with a pulverizer to obtain powdery materials, soak them in clean water twice and then wash them twice with deionized water in the way of suction filtration; Put the walnut shell powder in a muffle furnace for 2 hours at a high temperature of 550°C for vacuum heating, wash off the ash with deionized water, and dry at 105°C to constant weight. After sieving the material with a 100-mesh standard sampling sieve, the sieve is the walnut shell Biochar A; put walnut shell biochar A in an ultrasonic cleaner, add deionized water, m(walnut shell biochar A / g):v(deionized water / mL)=1:20, control the temperature at 50°C , ultrasonic frequency 30KHZ, cleaning 10min, after ultrasonic cleaning, 105 ℃ drying to constant weight, walnut shell biochar B;

[0035]Put the walnut shell biochar in the Erlenmeyer flask, add 60g / mL sodium citrate solution, wherein, m (walnut shell biochar / g):...

Embodiment 2

[0038] Take fresh walnut shells, soak them in clean water to wash away the sediment on the surface, crush them with a pulverizer to obtain powdery materials, soak them in clean water twice and then wash them twice with deionized water in the way of suction filtration; Put the walnut shell powder in a muffle furnace for 2 hours at a high temperature of 550°C for vacuum heating, wash the ash with deionized water, and dry at 105°C to constant weight. After sieving the material with a 100-mesh standard sampling sieve, the under-sieve is the walnut shell Biochar A; put walnut shell biochar A in an ultrasonic cleaner, add deionized water, m(walnut shell biochar / g):v(deionized water / mL)=1:30, control the temperature at 55°C, Frequency 80KHZ, ultrasonic cleaning for 20min, after ultrasonic cleaning, dry at 105°C to constant weight to obtain walnut shell biochar B;

[0039] Put the mangosteen shell biochar into the Erlenmeyer flask, add 80g / L sodium citrate solution, wherein, m (walnut...

Embodiment 3

[0042] Take fresh walnut shells, soak them in clean water to wash away the sediment on the surface, crush them with a pulverizer to obtain powdery materials, soak them in clean water twice and then wash them twice with deionized water in the way of suction filtration; Put the walnut shell powder in a muffle furnace for 2 hours at a high temperature of 550°C for vacuum heating, wash the ash with deionized water, and dry at 105°C to constant weight. After sieving the material with a 100-mesh standard sampling sieve, the under-sieve is the walnut shell Biochar A; put walnut shell biochar A in an ultrasonic cleaner, add deionized water, m(walnut shell biochar / g):v(deionized water / mL)=1:50, control the temperature at 65°C, Frequency 100KHZ, ultrasonic cleaning for 30min, after ultrasonic cleaning, dry at 105°C to constant weight to obtain walnut shell biochar B;

[0043] Put the mangosteen shell biochar into the Erlenmeyer flask, add 100g / L sodium citrate solution, wherein, m (waln...

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Abstract

The invention discloses a method for treating heavy metal waste liquid by using modified walnut shell biochar, which belongs to the technical field of heavy metal pollution control. In order to improve the efficiency for treating the heavy metal waste liquid by biochar, the present invention provides the method for treating the heavy metal waste liquid by using the modified walnut shell biochar. The method comprises the following steps: the walnut shell powder is subjected to high-temperature vacuum heating, and then ultrasonically cleaned to obtain the walnut shell biochar; the walnut shell biochar and a sodium citrate solution are mixed to obtain the modified walnut shell biochar; and the modified walnut shell biochar and the heavy metal waste liquid are reacted. The method adopts a composite modification method, through low-frequency ultrasonication and the sodium citrate modification treatment, the walnut shell biochar has more adsorption sites and enhance the adsorption performance of the walnut shell biochar, and the method processes the heavy metal environment pollution at low cost and high efficiency while recycling the agriculture and forestry wastes.

Description

technical field [0001] The invention belongs to the technical field of heavy metal pollution control, and in particular relates to a method for treating heavy metal waste liquid. Background technique [0002] The problem of heavy metal environmental pollution is one of the important problems that human beings must face in sustainable development. Adsorption is a relatively simple and efficient means to solve heavy metal pollution. The premise that adsorption can be widely used is to choose an adsorbent that is economical and highly efficient in removing pollutants. [0003] The adsorption method is to select porous solid matter as the adsorbent material to absorb harmful substances in the wastewater and make them adhere to the surface of the porous material so as to achieve the purpose of removing harmful substances from the wastewater. There are many kinds of substances that can be selected as adsorbents, which are mainly divided into three categories: biological, organic ...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/20B01J20/30B01D15/08C02F101/20C02F101/22
CPCB01D15/08B01J20/20B01J2220/4812B01J2220/4825C02F1/283C02F2101/20C02F2101/22
Inventor 陈婷彭穗杨晓李道玉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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