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Preparation method and application of mg/ca loaded modified tobacco stalk biochar

A technology of biochar and tobacco stalks, applied in chemical instruments and methods, chemical/physical processes, other chemical processes, etc., can solve the problem of decreased adsorption capacity and achieve high adsorption capacity

Active Publication Date: 2021-08-31
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to absorb HPO under high pH conditions 4 2- Therefore, the ability of magnesium-loaded carbon to adapt to pH is improved, and a preparation method of Mg / Ca-loaded modified tobacco stalk biochar is provided. Mg / Ca biochar composite material also shows high adsorption capacity for phosphorus under high pH conditions. , which solved the problem of the decrease of the adsorption capacity of single metal Mg-loaded biochar under high pH conditions

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  • Preparation method and application of mg/ca loaded modified tobacco stalk biochar
  • Preparation method and application of mg/ca loaded modified tobacco stalk biochar
  • Preparation method and application of mg/ca loaded modified tobacco stalk biochar

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Embodiment 1

[0026] A preparation method of Mg / Ca loaded modified tobacco stalk biochar, according to the mass ratio of Mg to tobacco stalk is 0.3:1, 20g of tobacco stalk powder is added to 180mL MgCl 2 Then add 20 g of egg shell powder, stir at room temperature for 1 h, then dry in an oven at 105 °C for 8 h, transfer the mixture into a porcelain crucible, heat up to 700 °C in a muffle furnace at 5 °C / min for 2 h, and wait for After the temperature in the furnace was cooled to room temperature, it was taken out, washed three times with deionized water, vacuum filtered, dried at 105°C for 6 hours, and crushed through a 60-mesh sieve to obtain Mg / Ca-loaded modified tobacco stalk biochar. The biochar was named EM-C24.

[0027] Study on Kinetics and Isotherms of Phosphate Adsorption

[0028] Configure different concentrations of MgCl 2 Solution, according to the mass ratio of Mg to tobacco stalks is 0:1, 0.12:1, 0.3:1, 0.48:1 respectively, add 20g of tobacco stalk powder to 180mL of MgCl wit...

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Abstract

The invention relates to a method for preparing Mg / Ca-loaded modified tobacco stalk biochar, which comprises adding tobacco stalk powder into MgCl 2 Then add egg shell powder to the solution, stir, dry for the first time, pyrolyze, wash, dry for the second time, crush and sieve to obtain Mg / Ca loaded modified tobacco stalk biochar. The present invention passes through MgCl 2 Tobacco stalk metal biochar composites loaded with Mg / Ca were prepared by pretreatment and egg shell doping, and the Mg / Ca biochar composites were resistant to HPO under high pH conditions. 4 2‑ It shows a high adsorption capacity, successfully solves the problem of the decrease of adsorption capacity of single metal Mg-loaded biochar under high pH conditions, and improves the pH adaptability of single metal Mg-loaded biochar. The test results can provide reference for the preparation of low-cost metal biochar composite materials, provide technical guidance for phosphorus removal in alkaline water, and also provide new ideas for waste disposal with high Ca content and mixed waste treatment.

Description

technical field [0001] The invention belongs to the field of adsorption materials, and relates to biochar materials, in particular to a method for Mg / Ca loaded modified tobacco stalk biochar and its application. Background technique [0002] Phosphorus is an essential element for the growth of animals and plants, but excessive discharge of phosphorus into water will cause eutrophication and cause serious damage to aquatic ecosystems. How to recover phosphate in wastewater scientifically and rationally is of great significance. Biochar is the residue of thermochemical conversion of biomass under anaerobic or oxygen-limited conditions. It has the characteristics of high porosity, specific surface area and certain surface functional groups. Functional environmental materials. Generally speaking, biochar prepared by pyrolysis at high temperature (600-700 °C) has a good carbon layer structure, high aromaticity, low polarity, and better adsorption performance. However, the adso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01D15/08
CPCB01D15/08B01J20/041B01J20/043B01J20/20B01J20/3078B01J2220/4825B01J2220/4881
Inventor 王风何秋平罗元张克强
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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