Citric acid loofah sponge preparation method and application

A loofah and citric acid technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of small adsorption capacity of adsorbents, and achieve conditions that are easy to control, fast, and desorption good performance

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

AI Technical Summary

Problems solved by technology

[0004] The adsorption capacity of the adsorbent for metal ions in the water system obtained by using loofah or loofah chemical modification is relatively small

Method used

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  • Citric acid loofah sponge preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Loofah pretreatment: loofah is derived from loofah fruit, obtained by peeling and removing the core, cutting loofah into small pieces, washing with water, drying, crushing, and sieving with a 60-mesh sieve;

[0014] (2) saponified loofah: the loofah of pulverizing is pressed 50% of gross mass, is that the NaOH solution of 0.5mol / L and 1% OP solution are mixed and immersed in azeotropic 1h with concentration, constantly adds water during azeotropic period, to keep The volume of the solution is constant, after cooling, it is washed with deionized water until the pH is about 7, then soaked in isopropanol for 3 hours, filtered by suction and dried at 75°C to obtain saponified loofah.

[0015] (3) Add 20g of citric acid and 100mL of distilled water into a stoppered Erlenmeyer flask, mix well, add 20g of saponified loofah, stopper, reflux at 70°C for 2h with stirring, then heat up to 110°C for 2h, after cooling , washed with deionized water, suction filtered until the fil...

Embodiment 2

[0017] (1) Loofah pretreatment: loofah is derived from loofah fruit, obtained by peeling and removing the core, cutting loofah into small pieces, washing with water, drying in vacuum, crushing, and sieving with a 50-mesh sieve;

[0018] (2) saponification loofah: the loofah of pulverizing is by 45% of gross mass, is that the NaOH solution of 0.4mol / L and 0.8% OP solution mix immersion azeotropy 1.5h with concentration, constantly add water during azeotropy, with Keep the volume of the solution constant, wash it with deionized water until the pH is about 7 after cooling, soak it in isopropanol for 2.5 hours, filter it with suction and dry it at 70°C to obtain saponified loofah.

[0019] (3) Add 25g of citric acid and 110mL of distilled water into a stoppered Erlenmeyer flask, mix well, add 25g of saponified loofah, stopper, at 60°C, reflux with stirring for 3h, then heat up to 120°C for 3h, after cooling , washed with deionized water, suction filtered until the filtrate is neut...

Embodiment 3

[0021] (1) Loofah pretreatment: loofah is derived from loofah fruit, which is obtained by peeling and removing the core, cutting loofah into small pieces, washing with water, vacuum drying, crushing, and sieving with a 40-mesh sieve;

[0022] (2) saponified loofah: 50% of the total mass of the pulverized loofah is mixed with NaOH solution and 0.8% OP solution with a concentration of 0.4mol / L and submerged in azeotropic 2h, and water is constantly added during the azeotropic period to keep The volume of the solution is constant, after cooling, it is washed with deionized water until the pH is about 7, then soaked in isopropanol for 3 hours, filtered with suction, and dried at 75°C to obtain saponified loofah.

[0023] (3) Add 18g of citric acid and 100mL of distilled water into a stoppered Erlenmeyer flask, mix well, add 20g of saponified loofah, stopper, reflux at 65°C for 3h with stirring, then heat up to 120°C for 2h, after cooling , washed with deionized water, suction filt...

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Abstract

The invention discloses a citric acid loofah sponge preparation method and an application technology. The preparation method provided by the invention is characterized by comprising the following steps of: adding 18-25 wt% of citric acid, 18-25 wt% of saponified loofah sponge and 50-60 wt% of water into a plugged Erlenmeyer flask, putting on a plug, carrying out refluxing at the temperature of 60-70 DEG C for 2-3h with stirring, heating up to the temperature of 110-120 DEG C, reacting for 2-3h, cooling, washing by using deionized water, carrying out pumping filtration until a filtrate is neutral, washing by using a few ethanol, and drying in a baking oven of 75 DEG C to obtain the citric acid loofah sponge. The citric acid loofah sponge has strong adsorption capability, can directly used for the adsorption and elution of various metal ions and organic dyes in a water body, is characterized by high adsorption efficiency, fast adsorption speed, good physical and chemical stability and excellent mechanical stability, and can be used within a wide soda acid range. Simultaneously, the citric acid loofah sponge has regeneration capability and is a natural green adsorbent.

Description

technical field [0001] The invention relates to a preparation method and application technology of an adsorbent for metal ions and organic dyes in a water system, in particular to a preparation method and application technology of citric acid loofah. Background technique [0002] The application of domestic loofah as adsorbent in metal ion adsorption, the patent application number is 200810034734.6 discloses the application of loofah to the adsorption performance of various metal ions and the application of loofah as adsorbent in metal ion adsorption, wherein loofah has Cu 2+ and Zn 2+ The desorption rate is about 40%, and the loofah has a good effect on Cu 2+ The adsorption capacity of Zn is 0.16mmol / g, respectively. 2+ The adsorption capacity of loofah is about 0.39mmol / g, and in the system with pH of 1, the desorption rates are 46% and 47% respectively; the alkalization modification method and application of loofah are disclosed in the patent application number 2008100...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
Inventor 李慧芝许崇娟庄海燕张瑾
Owner UNIV OF JINAN
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