Method for preparing porous calcium titanate heavy metal adsorbent

A technology of calcium titanate and adsorbent, which is applied in the field of preparation of porous calcium titanate heavy metal adsorbent, to achieve the effect of strong acid and alkali resistance and heat resistance, wide variety of heavy metals, and wide application range

Inactive Publication Date: 2012-05-02
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the use of furfural slag in the preparation of porous calc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of preparation method of porous calcium titanate heavy metal adsorbent of the present invention specifically comprises the following steps:

[0015] (1) Pretreatment of furfural slag: After drying, furfural slag is mechanically crushed, passed through an 80-mesh sieve, and set aside.

[0016] (2) Preparation of sol: Dissolve 28.34 g of calcium nitrate hexahydrate and 3.00 g of citric acid in 60 mL of absolute ethanol at room temperature, and stir magnetically for 30 minutes to form an ethanol solution of calcium. In addition, 40.84 g of tetra-n-butyl titanate was dissolved in 45 mL of absolute ethanol under vigorous stirring, and 165 mL of glacial acetic acid was added dropwise under continuous stirring, and stirred evenly to obtain a titanium precursor solution. Under stirring conditions, the ethanol solution of calcium was added to the titanium precursor solution, and 45 ml of dispersant oleic acid was added. After stirring evenly, 95 mL of water was added, and...

Embodiment 2

[0019] Example 2: Adsorption isotherms for lead, cadmium, nickel, copper, zinc and silver

[0020] Take a certain amount of a single metal ion in a 50 mL stoppered graduated colorimetric tube (the scale has been calibrated), adjust the pH value to 5-8, dilute with water, add 0.1 g of adsorbent, seal it tightly, and oscillate (or stir) at constant temperature for adsorption After 10 min and resting for 30 min, the concentration of heavy metal ions in the supernatant was measured; the initial concentration of metal ions was changed to measure the adsorption amount, and the adsorption isotherm was drawn. The results showed that the adsorption capacity increased with the increase of the initial concentration, and when the initial concentration reached a certain amount, the adsorption capacity stopped increasing and the adsorption was saturated. The saturated adsorption capacities of lead, cadmium, nickel, copper, zinc and silver are 780mg / g, 73.2mg / g, 82.5mg / g, 220mg / g, 346.3mg / g ...

Embodiment 3

[0021] Embodiment 3: lead, the adsorption effect when cadmium, nickel, copper, zinc and silver exist simultaneously

[0022] Prepare 1 L of heavy metal mixed solution containing 0.1 g / L of lead and 0.05 g / L of cadmium, nickel, copper, zinc and silver, and adjust the pH value to 5-8. Weigh 2g of the adsorbent prepared in Example 1, add it to the mixed standard solution, stir (or vibrate) at room temperature for 10 minutes, let it stand for 30 minutes, and measure lead, cadmium and nickel in the supernatant by flame atomic absorption , copper, zinc and silver concentrations, calculated lead, cadmium, nickel, copper, zinc and silver removal rates were 100%, 99.8%, 98.1%, 100%, 100% and 99.5%.

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Abstract

The invention discloses a method for preparing a porous calcium titanate heavy metal adsorbent. In the method, the porous flaky calcium titanate heavy metal adsorbent is prepared by taking solid wastes in furfural industry, namely furfural residues as a template agent by a sol-gel method. The method comprises the following steps of: crushing the dried furfural residues, adding calcium titanate sol, stirring uniformly, and drying to obtain a furfural residue-calcium titanate gel composite; and calcining at high temperature, and oxidizing and decomposing organic matters in the furfural residues and the calcium titanate gel to obtain the porous calcium titanate adsorbent. The porous calcium titanate heavy metal adsorbent is used for adsorbing and removing multiple kinds of heavy metals such as lead, cadmium, nickel, copper, zinc, silver and the like simultaneously. The furfural residues are used as the template agent, so the solid wastes are utilized, and the high adsorbability and high stability of the calcium titanate are utilized simultaneously; and the adsorbent synthesized by the method has the advantages of low cost, simple process, large adsorption capacity, wide application range, high hydrothermal stability, high acid and alkali resistance, and the like, and is convenient to regenerate and recover.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a preparation method of a porous calcium titanate heavy metal adsorbent. Background technique [0002] With the development of industry, a large amount of waste water, waste gas and waste residue enter the environment, causing serious environmental problems and endangering human health. Among many pollutants, heavy metals are a kind of highly toxic pollutants that can accumulate in living organisms. All countries have established strict emission standards to control the emission of heavy metals. Various enterprises have also spent a lot of manpower and material resources on the treatment of the three wastes. However, heavy metal pollution accidents still occur from time to time. One of the main reasons is that the current treatment methods are costly or complicated. In recent years, people continue to explore new treatment methods. Among them, the adsorption method has been wid...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/30B09B3/00C02F1/28C02F1/62
Inventor 张东贾立娇宋恩军任广军
Owner SHENYANG LIGONG UNIV
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