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Preparation method and application of Mg/Ca loaded modified tobacco stalk biochar

A biochar and tobacco stalk technology, applied in chemical instruments and methods, chemical/physical processes, other chemical processes, etc., can solve problems such as the decrease in adsorption capacity, and achieve the effect of high adsorption capacity

Active Publication Date: 2021-01-08
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 preparation method of Mg / Ca loaded modified tobacco stalk biochar, which comprises the following steps: adding tobacco stalk powder into an MgCl2 solution, adding egg shellpowder, stirring, drying for the first time, pyrolyzing, cleaning, drying for the second time, pulverizing and screening to obtain the Mg / Ca loaded modified tobacco stalk biochar. The Mg / Ca loaded tobacco stalk metal biochar composite material is prepared through MgCl2 pretreatment and egg shell doping, the Mg / Ca biochar composite material has high adsorption capacity on HPO4<2-> under the condition of high pH, the problem that the adsorption capacity of single metal Mg-loaded biochar is reduced under the condition of high pH is successfully solved, and the pH adaptability of the single metalMg-loaded biochar is improved. The test result can provide reference for preparation of a low-cost metal biochar composite material, provide technical guidance for phosphorus removal of an alkaline water body, and also provide a new thought for disposal of wastes with high Ca content and mixed treatment of the wastes.

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 Applications(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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