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Composite modified banana peel biochar as well as preparation method and application thereof

A composite modification and biochar technology, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve problems such as unstable chemical properties, easy deactivation, and adsorbent pollution, and achieve enhanced physical adsorption capacity, enhanced chemical adsorption capacity, and the effect of adsorption and stability

Pending Publication Date: 2022-07-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a kind of composite modified banana peel biochar and its preparation method and application, aim to solve the generally low adsorption efficiency of existing banana peel biochar, to heavy metals, especially Tl (I), As (V), poor removal effect of Pb(II), fewer effective functional groups, unstable chemical properties, and existing adsorbents are polluting and easy to deactivate, etc.

Method used

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  • Composite modified banana peel biochar as well as preparation method and application thereof
  • Composite modified banana peel biochar as well as preparation method and application thereof
  • Composite modified banana peel biochar as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: Preparation of composite modified banana peel biochar (P-S-Fe-BC)

[0057] 1. Provide banana peel biochar

[0058] The dried banana peel waste is subjected to high temperature carbonization treatment and pulverization to obtain banana peel biochar.

[0059] 2. Preparation of the first pretreatment biochar

[0060] (1) 9.446g Ca(NO 3 ) 2 ·4H 2 O and 3.169g (NH 4 ) 2 HPO 4 40 mL of calcium salt solution and 40 mL of phosphate solution were prepared as starting materials.

[0061] (2) At room temperature (25°C), add 10 g of banana peel biochar to the calcium salt solution, and use magnetic stirring (150 rpm, continuous stirring for 30 min) to evenly mix to obtain mixed solution A.

[0062] (3) Mix the above-mentioned mixed solution A with the above-mentioned phosphate solution (stir for 2h at room temperature), and use NH 4 OH adjusts the pH value of the solution to keep the pH between 10-10.5 to obtain mixed solution B.

[0063] (4) performing hydroth...

Embodiment 2

[0071] Example 2: Characterization of composite modified banana peel biochar (P-S-Fe-BC) and second pretreatment biochar (PBPB), and comparative analysis of their products acting on heavy metals

[0072] In this embodiment, the comparative analysis of products acting on heavy metals takes the removal of Pb(II) and As(V) as an example.

[0073] (1) Scanning electron microscope (SEM) comparative analysis of the second pretreatment biochar (PBPB) and the composite modified banana peel biochar (P-S-Fe-BC)

[0074] The SEM results of PBPB and P-S-Fe-BC are as follows figure 1 shown.

[0075] The surface of PBPB exists in the form of large and smooth minerals, and has a unique adsorption pore structure, which is conducive to the adsorption of heavy metals. Many smaller particles with uneven and rough morphology appeared on the surface of P-S-Fe-BC after mixing treatment, and these small particles adhered in the form of aggregates, which made P-S-Fe-BC further enhance the biologica...

Embodiment 3

[0087] Example 3: Removal of Tl(I), As(V) and Pb(II) by composite modified banana peel biochar (P-S-Fe-BC)

[0088] To the Erlenmeyer flask containing Tl(I), As(V) and Pb(II) at 10 ppm, 30 ppm and 30 ppm, respectively, 0.25 g of P-S-Fe-BC prepared in Example 1 was added.

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PUM

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Abstract

The invention provides a preparation method of composite modified banana peel biochar, which comprises the following steps: obtaining first pretreated biochar and second pretreated biochar, and then mixing the first pretreated biochar and the second pretreated biochar to obtain the composite modified banana peel biochar, wherein the first pretreated biochar is banana peel biochar subjected to hydrothermal synthesis treatment of calcium salt and phosphate, and the second pretreated biochar is banana peel biochar subjected to high-temperature carbonization treatment of sulfuric acid and ferric salt. Compared with existing materials, after the composite modified banana peel biochar is applied to thallium, arsenic and lead combined polluted water, the composite modified banana peel biochar has the advantages of being high in adsorption performance, stable in adsorption combination, low in price, environmentally friendly and high in applicability.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a composite modified banana peel biochar and a preparation method and application thereof. Background technique [0002] Thallium (Tl), arsenic (As) and lead (Pb) are global pollutants. Due to disordered mining and smelting, a large amount of slag wastewater containing thallium, arsenic and lead enters the environment, which seriously threatens the ecological environment. and human health. Thallium, arsenic and lead ions in water can cause cancer, high blood pressure, paralysis, diabetes, tumors, liver and lung failure, joint disease, cerebral hemorrhage and sudden death. Existing technologies for the removal of thallium, arsenic and lead, including membrane filtration, ion exchange and chemical precipitation, are used to remove thallium, arsenic and lead from wastewater, and are widely used in Asian countries. However, these technologies are not suitable for wid...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10C02F101/20
CPCB01J20/20B01J20/04B01J20/0296B01J20/0229B01J20/0292B01J20/0259C02F1/283B01J2220/4806C02F2101/20C02F2101/103
Inventor 廖骐江森曹维涂光远杨志辉杨卫春司梦莹孙竹梅王海鹰颜旭
Owner CENT SOUTH UNIV
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