Iron-zirconium-aluminum combined pillared bentonite composite material and preparation method thereof

A technology of composite materials and bentonite, applied in the field of materials, can solve the problems of reduced adsorption capacity, waste of adsorbents or raw materials, and complex processes, etc., and achieve the goals of increased specific surface area and porosity, strong cation replacement capacity, and enhanced physical and chemical properties. Effect

Active Publication Date: 2020-04-14
QINGDAO UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The preparation of zirconium-magnesium modified bentonite by Scheme 1 has a good adsorption effect on phosphate, and a higher zirconium loading is beneficial to enhance the ability of zirconium-magnesium modified bentonite to adsorb phosphate in water, and a lower zirconium loading is conducive to improving the adsorption capacity of zirconium and magnesium. ZrO per unit mass in magnesium modified bentonite 2 The adsorption capacity of phosphate in water makes it difficult to determine the dosage of bentonite composite materials, which is more likely to cause waste of adsorbents or raw materials
Scheme 2 prepares magnetic zirconium iron bentonite and the steps are cumbersome. During the static adsorption process, magnets need to be installed around the reactor to facilitate material recovery. However, in industrial applications, strong magnetic fields will interfere with the normal operation of peripheral instruments, and the adsorbent will be magnetized. The process mostly uses Fe 3 o 4 , γ-Fe 2 o 3 These substances will occupy the active adsorption sites and reduce the adsorption capacity.
The HDTMA in the HDTMA-modified bentonite prepared in Scheme 3 has extremely high toxicity and may have long-term adverse effects on the water environment, and the technical steps are complicated and difficult to operate
The aluminum-modified bentonite prepared in Scheme 4 has many technical steps, complicated process, and it takes a long time for the adsorption to reach equilibrium
The adsorption effect of the low-temperature plasma-modified bentonite prepared in scheme 5 is greatly affected by pH. Under acidic conditions, the adsorption effect of the bentonite sample on methylene blue is obviously poor

Method used

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  • Iron-zirconium-aluminum combined pillared bentonite composite material and preparation method thereof
  • Iron-zirconium-aluminum combined pillared bentonite composite material and preparation method thereof
  • Iron-zirconium-aluminum combined pillared bentonite composite material and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0039] Preparation of Al pillar liquid: drop 80mL 0.4mol / L NaOH into AlCl at a rate of 5mL / min 3 In the solution, heat and stir in a constant temperature (60° C.) water bath for 3 to 4 hours. The obtained pillaring solution was placed at room temperature for 24 hours to facilitate aging.

[0040] Preparation of Fe, Al, Zr pillared bentonite: Weigh a certain amount of bentonite into a three-necked flask, add FeCl 3 solution and ZrOCl solution (FeCl 3 The ratio of ZrOCl and ZrOCl can be added arbitrarily, when the molar ratio of the two is 3:1, the effect is the best), and the bentonite is evenly dispersed in the FeCl 3 and ZrOCl solution, and finally drop a certain amount of Al pillar solution into a three-necked flask, and heat and stir in a water bath (60° C.) for 4 hours. Place at room temperature for 24h.

[0041] Washing of the sample: put the prepared sample in a centrifuge, centrifuge at 6000r / min for 5min, pour off the supernatant, add distilled water and repeat was...

experiment example

[0045] Test method for adsorption properties of products

[0046] Weigh a certain amount of adsorbent sample into a 250mL Erlenmeyer flask, add a certain concentration of crystal violet solution, adjust the temperature of the constant temperature oscillator, and shake it at a speed of 175rpm for a certain period of time. After the reaction is over, put the adsorbed solution to stand , Take an appropriate amount of supernatant and dilute it by a certain number of times to measure its absorbance with a UV spectrophotometer, and calculate the corresponding removal rate and adsorption amount.

[0047] Removal rate (η) is calculated according to the following formula:

[0048]

[0049] Wherein: η——the removal rate of Cu (II), %;

[0050] C 0 - the initial concentration of the solution, mg / L;

[0051] C t —concentration of the solution at time t, mg / L;

[0052] Adsorption capacity (q t ) is calculated according to the following formula:

[0053]

[0054] where: q t ——t...

experiment example 1

[0059] Experimental example 1: Test of the effect of the amount of iron-zirconium-aluminum combined pillared bentonite on the adsorption performance

[0060] Add 0.01, 0.02, 0.03, 0.04, 0.05, and 0.06 g of iron-zirconium-aluminum joint pillared bentonite composite samples to 50 mL of 200 mg / L crystal violet solution, shake at a speed of 175 rpm for a certain period of time, and the obtained solution Let it stand still, and take an appropriate amount of supernatant to measure the absorbance. from figure 1 It can be seen that when the dosage of the iron-zirconium-aluminum combined pillared bentonite composite sample reaches 1g / L, the maximum removal rate is reached, and the removal rate remains unchanged when more adsorbents are added, so the subsequent The data in the examples all adopt a sorbent dosage of 1 g / L.

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Abstract

The invention provides an iron-zirconium-aluminum combined pillared bentonite composite material and a preparation method thereof. The method comprises the steps that firstly, natural bentonite is treated with iron and zirconium, then modification is conducted with aluminum, and iron-zirconium-aluminum modified bentonite is prepared through heating and stirring; the iron-zirconium-aluminum combined pillared bentonite composite material is prepared by adopting an inorganic pillared bentonite modification method, so that the preparation process is simplified, the production efficiency is improved, the production cost is reduced, other used raw and auxiliary reagents are non-toxic and harmless, and the iron-zirconium-aluminum combined pillared bentonite composite material belongs to an environment-friendly product.

Description

technical field [0001] The invention relates to the field of material technology, in particular to an iron-zirconium-aluminum combined pillared bentonite composite material and a preparation method thereof. Background technique [0002] Bentonite is a traditional low-cost natural silicate mineral, which is composed of two layers of silicon-oxygen tetrahedron and one layer of aluminum-oxygen octahedron. The general formula is: Nax(H 2 O) 4 {(Al 2 -xMg 0.33 )[Si 4 o 10 ](OH) 2}. Bentonite has a large surface area, unique sandwich structure, high cation exchange capacity and negative surface charge, and also has excellent chemical activity and mechanical strength. However, the hydrophilic film on the surface of natural bentonite makes it slow in adsorption of non-hydrophilic pollutants, and the adsorption effect is not good. When it is put into use, it often fails to meet the relevant requirements, which limits its wide use. In order to make bentonite have better adsorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12C02F1/28B01J20/30
CPCB01J20/12B01J20/0229B01J20/0248B01J20/0211C02F1/281
Inventor 刘娟刘鸿浩
Owner QINGDAO UNIV OF SCI & TECH
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