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Carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions, and preparation method thereof

A MCM-41, a technology for adsorbing heavy metals, applied in the direction of molecular sieves and alkali exchange compounds, non-metallic elements, chemical instruments and methods, etc., can solve the problems of slow kinetics, easy swelling, poor mechanical stability, etc., and achieve narrow pore size distribution, Easy operation and mild reaction conditions

Inactive Publication Date: 2011-11-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, organic polymer materials modified by chemical groups have been used to adsorb heavy metal ions in wastewater. Although they have a large number of active centers that can combine with metals, they still have the characteristics of easy swelling, slow kinetics, and poor mechanical stability. shortcoming

Method used

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  • Carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions, and preparation method thereof
  • Carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions, and preparation method thereof
  • Carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions, and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0026] Embodiment 1: Dissolve 25g of sodium silicate with 30ml of distilled water. Heat and dissolve 6.4 g of cetyltrimethylammonium bromide (CTAB) in 20 ml of distilled water, and after cooling to room temperature, mix it with sodium silicate and stir for 10 min. The pH value of the mixture was adjusted to 10 with sulfuric acid solution (5 mol / L), and the stirring was continued for 80 min, so that the solution became a viscous white gel. Then put it into a 100ml stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, put it in an oven, crystallize at 130°C for 72h, take it out, cool it and filter it, wash it to neutral, and then dry it at 90°C Put the obtained semi-finished product in a muffle furnace overnight, and bake it at 550°C for 5 hours to obtain an all-silicon MCM-41 mesoporous molecular sieve, which is spherical and has a particle size of 200-300nm. Scanning electron microscope results such as figure 1 , the specific surface area is 1228...

Embodiment 2

[0029] Example 2: Take 20 mg of the mesoporous adsorbent synthesized in Example 1 in a 50 ml Erlenmeyer flask with a stopper, and add 10 ml of different concentrations of Cu in turn. 2+The prepared solution was adjusted to pH 6 with dilute hydrochloric acid and sodium hydroxide solution. At 308K, place the Erlenmeyer flask in a shaker and stir for 2 hours. After standing still, filter the supernatant with a 0.45 μm filter membrane. Use an ICP tester to measure the concentration of residual heavy metal ions. Calculate the adsorption amount Q (mg) according to the following formula / g).

[0030] Q=(C 0 -C e )*V / m

[0031] Q-adsorption capacity (mg / g); C 0 -Initial concentration of solution (mg / L); C e - solution equilibrium concentration (mg / L); V - solution volume (L); m - adsorbent dosage (g).

[0032] Adsorption isotherm see Figure 5 , through the Langmuir type linear fitting of the adsorption isotherm, the saturated adsorption capacity of the adsorbent for copper ion...

Embodiment 3

[0033] Embodiment three: take 20 mg of the mesoporous adsorbent synthesized in embodiment one in a 50 ml conical flask with a stopper, and add 10 ml of different concentrations of Pb successively. 2+ The prepared solution was adjusted to pH 6 with dilute hydrochloric acid and sodium hydroxide solution. At 308K, place the Erlenmeyer flask in a shaker and stir for 2 hours. After standing still, filter the supernatant with a 0.45 μm filter membrane. Use an ICP tester to measure the concentration of residual heavy metal ions. Calculate the adsorption amount Q (mg) according to the following formula / g).

[0034] Q=(C 0 -C e )*V / m

[0035] Q-adsorption capacity (mg / g); C 0 -Initial concentration of solution (mg / L); C e - solution equilibrium concentration (mg / L); V - solution volume (L); m - adsorbent dosage (g).

[0036] Adsorption isotherm see Image 6 , through the Langmuir linear fitting of the adsorption isotherm, the saturated adsorption capacity of the adsorbent for l...

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Abstract

The invention aims at providing a carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions (such as copper, chromium, lead, cadmium, cobalt, nickel, zinc, ferrum, mercury, silver, barium and the like) in waste water, and a preparation method thereof. The carboxylated MCM-41 mesoporous molecular sieve is characterized in that a mesoporous molecular sieve MCM-41 is utilized as a supporter; the surface of the carboxylated MCM-41 mesoporous molecular sieve contains organic functional groups (-COOH groups); the organic functional groups can undergo a coordination reaction or a chelation reaction with transition metal ions to produce an effective preferential adsorption effect. The carboxylated MCM-41 mesoporous molecular sieve has the advantages of extremely high specific surface area, regular pore canal structure, and uniform distribution of organic functional groups on the pore surface. The carboxylated MCM-41 mesoporous molecular sieve has a high adsorption capacity for heavy metal ions in waste water. The preparation method has the advantages of simple process, moderate reaction conditions, easy operation, good reappearance, environmentally friendly characteristics and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to carboxylated MCM-41 mesoporous molecular sieves for absorbing heavy metal ions and a preparation method thereof. Background technique [0002] At present, the increasing trend of heavy metals in water seriously endangers human health. Copper, cadmium, lead, cobalt, nickel, zinc and other heavy metals and their compounds are widely used in mining, smelting, electronics, electroplating, petroleum, fertilizer manufacturing and other industries, and have become important sources of pollution in sewage and have attracted people's attention. Therefore , Separating and removing various heavy metal ions from wastewater is of great significance to environmental protection. Adsorption is a common method for removing heavy metals in wastewater, and its effect on removing heavy metal ions mainly depends on the performance of the adsorbent. The ideal adsorbent shoul...

Claims

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Application Information

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IPC IPC(8): C01B39/04C01B39/48B01J31/04
Inventor 岳秀丽柏珊珊戴志飞
Owner HARBIN INST OF TECH
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