Preparation method and application of lanthanum-loaded magnetic hydrothermal biochar adsorbent

A magnetic water and thermal biological technology, applied in the direction of water pollutants, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of difficult recovery of adsorbents, achieve good application prospects, improve dispersibility and load capacity, The effect of a good environment

Inactive Publication Date: 2019-08-30
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, powdered carbon material adsorbents still have the problem of difficult recovery, and magnetic separation technology has become one of the research hotspots in the field of adsorption in recent years.

Method used

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  • Preparation method and application of lanthanum-loaded magnetic hydrothermal biochar adsorbent
  • Preparation method and application of lanthanum-loaded magnetic hydrothermal biochar adsorbent
  • Preparation method and application of lanthanum-loaded magnetic hydrothermal biochar adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh 20g of straw powder in 120ml of deionized water, fully stir and transfer to the reactor, react at 220°C and 4.5MPa for 2h, wash and dry at 105°C. The dried sample was ground and passed through an 80 mesh (0.178mm) sieve, washed several times with 1mol / L HCl solution, then washed with deionized water to neutrality, and dried in an oven at 80°C to obtain hydrothermal carbon HTC .

[0032] Put 200ml of deionized water in a three-necked flask, blow nitrogen gas for 30min at room temperature to exhaust the air in the flask, weigh 2.883g FeCl 3 ·6H 2 O and 1.060g FeCl 2 ·4H 2 O is dissolved in it, and then the different masses of LaCl are weighed 3 ·7H 2 O (Adjust FeCl 3 ·6H 2 O, FeCl 2 ·4H 2 O, LaCl 3 ·7H 2 The molar ratio of O (2:1:0, 2:1:2, 2:1:4 and 2:1:6) is placed in the flask. After dissolving completely, add 0.25g HTC, stir well, add concentrated ammonia water to pH 11, stir for 1h, warm to 80℃ for 1h, transfer to the reactor, react at 180℃ for 10h, use deionized w...

Embodiment 2

[0040] In this example, the adsorption process of phosphate radicals by an improved hydrothermal biochar phosphorus removal adsorbent made by the present invention was investigated. The preparation method of the phosphorus removal adsorbent in this embodiment is the same as the preparation method 1 described above. The adsorbent dosage is 0.2g / L, the initial phosphate concentration is 4mg P / L, the pH is adjusted to 7, the temperature is 25℃, and it is placed in a constant temperature oscillator to oscillate at a speed of 200r / min. The phosphate test method is molybdenum antimony Anti-colorimetric method. The quasi-second-order kinetic model is used to fit the measured data, and the results are as follows Figure 5 Shown. It can be seen that the fitting correlation coefficient R of the quasi-second-order kinetic model for 2-La-MC 2 Higher (R 2 =0.984), indicating that the quasi-second-order kinetic model can better describe the adsorption process of phosphate on the lanthanum-l...

Embodiment 3

[0042] In this example, the adsorption process of phosphate radicals by an improved hydrothermal biochar phosphorus removal adsorbent made by the present invention was investigated. The preparation method of the phosphorus removal adsorbent in this embodiment is the same as the preparation method 1 described above. The adsorbent dosage is 0.1g / L, the initial phosphate concentration is 0.5-15mg P / L, the pH is adjusted to 7, the temperature is 25℃, and it is placed in a constant temperature oscillator and oscillated at a speed of 200r / min for 3h. The phosphate test method is the molybdenum antimony colorimetric method. The Langmuir isotherm adsorption equation is used to fit the measured data, and the results are as follows Image 6 Shown. It is not difficult to find that the adsorption of phosphate on the lanthanum-loaded magnetic hydrothermal biochar is more in line with the Langmuir isotherm adsorption equation (R 2 =0.99), and 2-La-MC exhibits ultra-high phosphorus adsorptio...

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Abstract

The invention discloses a preparation method of a lanthanum-loaded magnetic hydrothermal biochar adsorbent and an application of the lanthanum-loaded magnetic hydrothermal biochar adsorbent in selective phosphorus adsorption. The preparation method comprises the following steps of fully reacting ground and cleaned straws serving as a carbon source and deionized water serving as a solvent in a hydrothermal kettle at a certain temperature to obtain hydrothermal biochar HTC; dissolving the HTC, ferric trichloride, ferrous chloride and lanthanum chloride in water; adding an alkaline precipitator;conducting fully stirring and transferring the solution to the hydrothermal kettle; treating the solution for a certain time at a certain temperature; and conducting washing and drying to obtain the lanthanum-loaded magnetic hydrothermal biochar. The novel adsorbent of the invention can effectively remove phosphate radicals in water, has excellent adsorption performance on the phosphate radicals,which can reach 100.25 mg P/g, shows good high selectivity, superparamagnetism and stability, and provides an environment-friendly hydrothermal biochar-based material with excellent adsorption performance for adsorbing and purifying phosphorus-containing wastewater.

Description

Technical field [0001] The invention relates to a preparation method and application of a lanthanum-loaded magnetic hydrothermal biochar adsorbent, and belongs to the technical field of sewage treatment. Background technique [0002] Phosphorus is an essential element in life, and it also occupies an extremely important position in industrial and agricultural production and daily life. With the rapid economic and social development, a large amount of phosphorus is discharged into water bodies. Studies have found that excessively high concentrations of phosphorus in water bodies can lead to eutrophication and severely damage the ecosystem. Therefore, it is imperative to develop efficient and energy-saving phosphorus removal technology. At present, the main methods of phosphorus removal include biological phosphorus removal, chemical precipitation, reverse osmosis, ion exchange, and adsorption. Among them, the adsorption method has a wide range of applications and can be used for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/0207B01J20/08B01J20/20C02F1/281C02F2101/105
Inventor 宋小宝何世颖冯彦房朱秋蓉俞映倞唐婉莹薛利红杨林章
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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