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Preparation method and application of biochar with efficient heavy metal adsorption performance

A technology of adsorption performance and biochar, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of slow degradation speed and generation of highly toxic by-products, etc., and achieve stable sources and good environmental effects And social effect, process simple effect

Pending Publication Date: 2021-02-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary zero-valent iron does have a certain effect on some pollutants, but its degradation rate is slow and may produce highly toxic by-products, while nano-zero-valent iron has a very high specific surface area, which can achieve the removal of most heavy metals. Reduction reaction, showing excellent performance in removing organic pollutants and heavy metals in water

Method used

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  • Preparation method and application of biochar with efficient heavy metal adsorption performance
  • Preparation method and application of biochar with efficient heavy metal adsorption performance
  • Preparation method and application of biochar with efficient heavy metal adsorption performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Modified sludge biochar material: Take a little municipal sludge, put it in an oven and dry it at 100°C until it reaches a constant weight, take it out and grind it through a 100-mesh sieve, put it into a tube furnace, pass N 2 And heat up to 700°C at a rate of 10°C / min and stay for two hours, then cool to room temperature to obtain sludge-based biochar BC; prepare two 50mL mixed solutions of ethanol and water (v:v is 1:1) named as A, B solution, add 2g prepared sludge-based biochar BC to A solution, and add 20.75g FeCl to B solution at the same time 3 ·6H 2 0 and 2g of cetyltrimethylammonium bromide (CTAB), then the prepared two solutions were added to the three-necked flask and stirred for 30min, after which one neck in the three-necked flask was used to supply inert N 2 gas to force air into the flask to prevent oxidation of the ZVI. Add 150mL of 0.6mol / L KBH dropwise from the other neck 4 , and stirred at 25°C for 6h, and left to age for 3d; finally, the mixed so...

Embodiment 2

[0023] The nZVI-BC prepared in Example 1 is used for the kinetic research of adsorption and removal of heavy metal chromium (Cr): an appropriate amount of Cr (VI) is dissolved in a volumetric flask to prepare a stock solution of 1000 mg / L, and then 10 mM NaNO 3 Dilute the background electrolyte to the desired concentration. Regulate the pH of the solution with 0.1M HCl and NaOH to be 2-12 with an interval of 1, and finally adjust the pH of the solution to be 3, then place the reaction bottle in a constant temperature shaker with a temperature of 298K to shake for 360min, and in different time periods (1min, 5min, 10min, 30min, 60min, 180min, 360min, 540min, 720min and 1440min) to take the supernatant, filter it with a 0.45 μm filter membrane, and measure the residual content of heavy metal Cr in the sample by liquid chromatography. The result is as image 3 As shown, the adsorption rate was faster before 180 min, then the adsorption rate began to decrease, and finally reached...

Embodiment 3

[0025] The nZVI-BC prepared in Example 1 is used for the kinetic research of adsorption and removal of heavy metal copper (Cu): an appropriate amount of copper (Cu) is dissolved in a volumetric flask to prepare a 1000 mg / L stock solution, and then 10 mM NaNO 3 Dilute the background electrolyte to the desired concentration. Regulate the pH of the solution with 0.1M HCl and NaOH to be 2-12 with an interval of 1, and finally adjust the pH of the solution to be 4, then place the reaction bottle in a constant temperature oscillator with a temperature of 298K to shake for 360min, and in different time periods (1min, 5min, 10min, 30min, 60min, 180min, 360min, 540min, 720min and 1440min) take the supernatant, filter it with a 0.45μm filter membrane, and measure the remaining content of Cu in the sample by liquid chromatography. The result is as image 3 As shown, the adsorption rate was faster before 180 min, then the adsorption rate began to decrease, and finally reached equilibrium...

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Abstract

The invention discloses a preparation method and application of biochar with efficient heavy metal adsorption performance, belonging to the field of environmental functional materials and biomass resource utilization. The method comprises the following steps: drying, grinding and sieving municipal sludge, and conducting calcining in a tubular furnace at a high temperature to obtain sludge-based biochar BC; and preparing two mixed solutions (wherein the volume of each mixed solution is 50 mL, and each mixed solution is composed of ethanol and water in a volume ratio of 1: 1) named as a solutionA and a solution B, adding 2 g of the calcined sludge-based biochar BC into the solution A, adding 20.75 g of FeCl3.6H2O and 2 g of cetyl trimethyl ammonium bromide (CTAB) into the solution B, continuing stirring, and successively carrying out standing, centrifuging and freeze-drying to obtain modified sludge-based biochar nZVI-BC. The method is simple in process, preparation raw materials have the advantages of being stable in source, low in cost and the like, heavy metal pollutants can be efficiently and rapidly removed, and meanwhile, a new way is provided for resource utilization of the sludge.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and biomass resource utilization, and in particular relates to a modified sludge biochar material and its preparation method and application. Background technique [0002] Heavy metals have been widely used in various industries, including mining, leather tanning, electroplating, iron and steel metallurgy or pigment synthesis and dyeing, etc., which leads to the inevitable release of heavy metals into the water environment along with sewage pipes. It is characterized by high toxicity and non-biodegradability, and poses a serious threat to aquatic organisms and human health if not handled properly. Studies have shown that lead, as one of the highly toxic heavy metals, poses a threat to human health, mainly affecting the central nervous system of the human body, causing diseases such as hepatitis and nephrotic syndrome; Cr 6+ It usually exists in the form of more mobile, soluble an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/20C02F101/22
CPCB01J20/20B01J20/06C02F1/281C02F2101/20C02F2101/22B01J2220/4887
Inventor 肖费雨蒋善庆王利平张翰琨周四海张亚楠
Owner CHANGZHOU UNIV