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Preparation method of alkali/bimetal salt thermally activated sludge biochar applied to removal of norfloxacin in water

A technology of norfloxacin and biochar, applied in water/sludge/sewage treatment, water pollutants, water/sewage treatment, etc., can solve the problem of limited activation effect of biochar, and achieve strong safety and easy separation The effect of regeneration ability, reduction of environmental pollution, and simple operation

Pending Publication Date: 2022-03-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, potassium hydroxide (KOH) and magnesium chloride (MgCl 2 ) activation of biochar is mostly done by impregnation or stirring, and the activation effect on biochar is limited

Method used

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  • Preparation method of alkali/bimetal salt thermally activated sludge biochar applied to removal of norfloxacin in water
  • Preparation method of alkali/bimetal salt thermally activated sludge biochar applied to removal of norfloxacin in water
  • Preparation method of alkali/bimetal salt thermally activated sludge biochar applied to removal of norfloxacin in water

Examples

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Effect test

example 1

[0041] Example 1: Municipal sludge was dried in an oven at 70°C to constant weight, and then transferred to a high-temperature tube furnace (N 2 The flow rate is 0.5L / min, the heating rate is 10°C / min), pyrolyzed at 700°C for 120min, and ground through a 100-mesh sieve to obtain sludge biochar SBC. Transfer SBC (mass 5.0g) into a 60mL reactor containing 2.5g of KOH dissolved in it, activate it hydrothermally at 220°C for 720min, then dry it in an oven at 70°C until constant weight, and grind it After passing through a 100-mesh sieve, KSBC is obtained by alkaline hydrothermally activated sludge biochar. SBC with a mass of 5.0g is added with 60mL of MgCl 2 (mass is 10g) and FeCl 3 ·6H 2 O (mass 5g) mixed solution in a reaction kettle, hydrothermally activated at 220°C for 720min, then placed in an oven at 70°C and dried to constant weight, ground and passed through a 100-mesh sieve to obtain bimetallic salt water heat-activated sewage Mud biochar MSBC. Using KSBC as the pre...

example 2

[0042] Example two: the KMSBC of 0.3g / L is added into the norfloxacin solution that volume is 100mL and concentration is 10mg / L, carries out adsorption experiment in the constant temperature shaking box (160rmp) of 25 ℃, at the time of setting (0 -1440min) sampling, utilize ultraviolet spectrophotometer to measure the residual concentration of norfloxacin at λ=273nm place, calculate its removal rate to norfloxacin at different times.

[0043] It can be seen from Fig. 1(a) that KMSBC can realize fast and efficient removal of norfloxacin, and its removal rate of norfloxacin exceeds 80% within 40min, and the removal rate of norfloxacin is the highest at 1440min. Up to 94.8%.

example 3

[0044] Example three: a dose of 0.3g / L of KMSBC was added to a volume of 100mL and a concentration of 5, 10, 20, 40, 60, 80 and 100 mg / L of norfloxacin solution respectively, and then placed at a temperature of 15 ℃, 25 ℃ and 35 ℃ in a constant temperature shaking box (160rmp), when the reaction is balanced, the residual concentration of norfloxacin is measured at λ=273nm by using an ultraviolet spectrophotometer.

[0045] It can be seen from Figure 1(b) that the adsorption capacity of norfloxacin by KMSBC increases with the concentration of norfloxacin and the increase of reaction temperature. At 35°C, its maximum adsorption capacity for norfloxacin can reach 68.5mg / g.

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Abstract

The invention discloses a preparation method of alkali / bimetal salt thermally activated sludge biochar applied to removal of norfloxacin in water, which specifically comprises the following steps: putting sludge biochar SBC prepared by pyrolysis in a tubular furnace into a reaction kettle containing a potassium hydroxide solution for hydrothermal activation to generate alkali hydrothermal activated sludge biochar KSBC; and then transferring the KSBC into a reaction kettle containing magnesium chloride and ferric chloride solution, and carrying out hydrothermal activation treatment to prepare the alkali / bimetallic salt hydrothermal activated sludge biochar KMSBC. The biochar prepared by the invention has excellent physicochemical properties, and can efficiently remove norfloxacin in water, and the maximum adsorption capacity of the biochar to norfloxacin can reach 68.5 mg / g when the reaction temperature is 35 DEG C. In addition, the biochar further has high safety and magnetic separation capacity, and efficient magnetic separation of the biochar and a solution and desorption and regeneration of sodium hydroxide can be achieved after adsorption.

Description

technical field [0001] The invention relates to the technical fields of biochar preparation and water treatment, in particular to a preparation method of alkali / bimetal salt water thermally activated sludge biochar applied to norfloxacin removal in water. Background technique [0002] In recent years, fluoroquinolone antibiotics (FQs) have become the most widely used antibiotics in the world, and the environmental problems caused by them have also attracted widespread attention. Among them, norfloxacin is widely used in the treatment of urinary, respiratory and intestinal diseases caused by sensitive bacteria because it can effectively inhibit the synthesis and replication of Gram-positive bacteria and Gram-negative bacteria. A kind of FQs. It is worth noting that the absorption capacity of norfloxacin by humans and animals is limited, and about 60-70% of the unabsorbed norfloxacin will be excreted through feces and urine and enter the water environment. The existing sewag...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F11/10C02F11/00C02F1/28C02F101/36
CPCB01J20/20B01J20/04B01J20/0229C02F11/10C02F11/00C02F1/283C02F2101/36
Inventor 张祖麟冯雨莹马永飞卢停妹杨列吴丽
Owner WUHAN UNIV OF TECH
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