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Adsorbent for adsorbing heavy metal ions and application of adsorbent

A technology for adsorbing heavy metals and adsorbents, applied in the field of sustainable renewable resources, can solve the problems of secondary pollution, high cost, harsh operating conditions, etc., and achieve the effects of no secondary pollution, low energy consumption, and high removal rate

Inactive Publication Date: 2017-05-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for removing heavy metal ions in wastewater mainly include ion exchange method, electrolysis method, chemical precipitation method, biochar adsorption method, etc., but these methods have certain limitations, such as high cost, harsh operating conditions, and easy formation of secondary Secondary pollution, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Crush the copper algae into 0.85-1.4mm particles, place it in a high-pressure container, and feed saturated water vapor with a pressure of 3.0MPa for 120s. Afterwards, the pressure was released to normal pressure, and washed with deionized water for 1 to 5 times, and the obtained adsorbent was CA-1. Then use formaldehyde-sulfuric acid modification (formaldehyde solution: sulfuric acid solution mass ratio=1:5, formaldehyde solution mass fraction is 37%, sulfuric acid solution substance concentration is 0.1mol / L), heat and reflux at 80°C for 2h, cool to Filter at room temperature, wash the filter residue with deionized water to pH > 5, and dry at 45°C to constant weight. The obtained adsorbent is designated as CA-1-1. The cellulose, hemicellulose, and lignin contents of the raw copper algae are 47.40% (wt, the same below), 12.33%, and 17.42%, respectively. The cellulose, hemicellulose, and lignin contents of CA-1 prepared by the method were 20.93%, 2.49%, and 34.12%, res...

Embodiment 2

[0022] Crush the copper algae into 10-30mm particles, place it in a high-pressure container, and feed saturated water vapor with a pressure of 3.5MPa for 120s. Afterwards, the pressure was released to normal pressure, and the deionized water was washed 1 to 5 times, and the obtained adsorbent was CA-2. Then use formaldehyde-sulfuric acid modification (formaldehyde solution: sulfuric acid solution mass ratio=1:5, formaldehyde solution mass fraction is 37%, sulfuric acid solution substance concentration is 0.1mol / L), heat and reflux at 80°C for 2h, cool to Filter at room temperature, wash the filter residue with deionized water to pH > 5, and dry at 45°C to constant weight. The obtained adsorbent is designated as CA-2-2. The cellulose, hemicellulose, and lignin contents of CA-2 prepared by the method were 22.59%, 2.15%, and 33.04%, respectively, and the cellulose, hemicellulose, and lignin contents of CA-2-2 were 24.04% respectively. , 2.43%, 63.99%.

Embodiment 3

[0024] Crush copper algae into particles of 1.40-2.36 mm, place them in a high-pressure container, and inject saturated water vapor with a pressure of 3.0 MPa for 120 seconds. Afterwards, the pressure was released to normal pressure, and the deionized water was washed 1 to 5 times, and the obtained adsorbent was CA-3. Then use formaldehyde-sulfuric acid modification (formaldehyde solution: sulfuric acid solution mass ratio=1:5, formaldehyde solution mass fraction is 37%, sulfuric acid solution substance concentration is 0.1mol / L), heat and reflux at 80°C for 2h, cool to Filter at room temperature, rinse the filter residue with deionized water to pH > 5, and dry at 45°C to constant weight. The obtained adsorbent is designated as CA-3-3. The cellulose, hemicellulose, and lignin contents of CA-3 prepared by the method were 22.09%, 1.72%, and 35.84%, respectively. The cellulose, hemicellulose, and lignin contents of CA-3-3 were 31.85%, 1.91%, and 62.30%, respectively.

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Abstract

The invention relates to a preparation method of an adsorbent for adsorbing heavy metal ions. The preparation method comprises the following steps: (1) air drying, cleaning, drying and crushing raw material Sargassum horneri; and (2) introducing saturated steam into Sargassum horneri particles to reach an assigned pressure, maintaining for a certain time, and instantaneously relieving the pressure to a normal pressure; and (3) carrying out heating reflux by virtue of formaldehyde-sulfuric acid mixed liquid, filtering, flushing filter residues with deionized water, and drying to constant weight, so as to obtain the adsorbent. The preparation method has the beneficial effects that the raw materials have a wide source, is cheap and easily available, the removal rate of a typical heavy metal pollutant, namely chromium ions in water is relatively high, the separation, recycling and reutilization are convenient, the secondary pollution is avoided, the reasonable utilization of resources is realized, and the economic and environmental benefits are good. The preparation method has wide application prospects in sewage treatment.

Description

technical field [0001] The invention relates to research on a method for preparing an adsorption material with high adsorption performance by using the marine aquatic plant copper algae as a raw material, and belongs to the field of sustainable renewable resources. Related technologies of multiple disciplines are involved, including biomass resource science, chemical engineering, environmental protection and restoration, etc. Background technique [0002] Science is a double-edged sword. Since the 20th century, the rapid development of science and technology has accelerated economic development and improved people's living standards. However, people have paid a painful price for this. The discharge of industrial "three wastes", domestic sewage discharge, mining development, agricultural irrigation and fertilization, etc., have seriously polluted the soil, water quality and atmosphere on which we live, affecting our physical and mental health, especially chromium ion pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J2220/4843C02F1/286C02F2101/20
Inventor 于凤文计建炳周小瑞戴妙琳韦一
Owner ZHEJIANG UNIV OF TECH
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