Ferrum carried spherical cellulose adsorbent, preparation and application thereof

A cellulose and adsorbent technology, which is applied in the field of iron-loaded spherical cellulose adsorbents, can solve the problems of ineffective removal of arsenite ions, increased operating procedures and costs, and low removal efficiency, and achieves good application prospects and good regeneration. effect, the effect of satisfying the adsorption rate

Inactive Publication Date: 2005-03-16
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using natural minerals to remove arsenic is cheap and has a wide range of sources, but the adsorption capacity is generally low, the removal efficiency is not high, and because it contains other trace elements, there may be other health risks (Zouboulis, 1993; Chakravarty, 2002)
Various metal oxides such as oxides of lanthanum, cerium, and zirconium, and iron oxides such as goethite, magnetite, and amorphous ferric hydroxide have been reported to remove arsenic (Tokunaga, 1997; Suzuki, 2000; Appelo, 2002; Jain, 1999), but most of these oxides are affected as adsorbents in packed be

Method used

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  • Ferrum carried spherical cellulose adsorbent, preparation and application thereof
  • Ferrum carried spherical cellulose adsorbent, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 16.0g of absorbent cotton (Henan Jiaozuo Hygienic Material Factory) was soaked in 400ml of 20% (m / v) NaOH aqueous solution for 2h, squeezed to about 75g (squeezing ratio is 4:1), to obtain alkali cellulose, the alkali fiber The element was sealed and aged at room temperature for 2-3 days, and 8ml CS was added 2 (CS 2 Milliliters=cotton cellulose dry weight (grams) / 2), seal, shake at 150rpm at room temperature for 4-8 hours to obtain orange-red viscose, add 100ml of 6% NaOH aqueous solution, stir for 3-5 hours to obtain uniform esterification Viscose. The viscose cannot be placed for a long time. Add 200ml of pump oil-chlorobenzene dispersion medium (pump oil: chlorobenzene = 2:1), 0.4g of potassium oleate, 50ml of the above-mentioned viscose liquid into a 500ml three-necked bottle, stir at 200-250rpm for 30 minutes, and then stir for 30-60 Slowly raise the temperature to 90°C within 1 minute, keep it warm for 2 hours, stop stirring, pour out the dispersion medium (th...

Embodiment 2

[0030] Take 50ml cellulose beads, add 100ml 5% (m / v) FeCl 3 ·6H 2 O solution, under the stirring condition of 180rpm at room temperature, slowly drop 100-110ml 0.5mol / L NaOH aqueous solution at the injection rate of 12ml / min. When the pH rises to 3.5-4.0, the unloaded part of iron precipitates out, pour out the suspension and the residual ferric hydroxide flocculent precipitate, and wash the beads with water for 5 times. The above-mentioned iron-loading process was repeated 12 times to obtain an iron-loaded spherical cellulose adsorbent with an iron content of 200±20 mg per milliliter, and a mass content of 42% (dry weight).

Embodiment 3

[0032] Take 50ml cellulose beads, add 100ml 10% (m / v) FeCl 3 ·6H 2O solution, under the stirring condition of 180rpm at room temperature, slowly drop into 100-110ml 1.0mol / L NaOH aqueous solution at 10ml / min. When the pH rises to 3.5-4.0, pour out the suspension and the residual ferric hydroxide precipitate, and wash the beads with water for 5 times. The above-mentioned iron-loading process was repeated 7 times to obtain an iron-loaded spherical cellulose adsorbent with an iron content of 200±20 mg per milliliter, and a mass content of 42%.

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Abstract

The invention relates to a kind of globe-form cellulose absorbent with iron carrying and its manufacturing and application. The carrying agent of the invention is globe-form cellulose, and the active center is the hydroxide of iron in the specific form, which has the high absorption activity. The manufacturing feature is as follows: dropwise alkali solution tardily into the solution of cellulose bead and molysite; in stirring condition, iron can load the cellulose bead by dispersing and hydrolyzing; after loading repeatedly and frequently, use the alkali solution to stabilize the ferruginous form. The manufacturing method of the absorbent has the advantages of environmental protection, novelty, simplicity and low cost. Moreover, it can remove arsenic, fluorine and other heavy metal with high efficiency and high selectivity, and the absorbent has excellent usage-prospect in nowadays.

Description

technical field [0001] The invention relates to an iron-loaded spherical cellulose adsorbent and its preparation and application. Background technique [0002] Arsenic is one of the most toxic elements and ranks at the top of the black list of polluting toxic elements (WHO, 1999). Arsenic contamination of drinking water sources, especially drinking groundwater, has attracted worldwide attention in recent years (AWWA, 2001; Bagla, 1996). The health of 7 million people throughout Bangladesh is at risk from drinking groundwater high in arsenic (Nickson, 1998; Bearak, 1998). The problem of arsenic pollution in China is also very prominent. The content of arsenic in groundwater in some areas of Taiwan, Xinjiang and Inner Mongolia seriously exceeds the standard, and the content in some areas of Inner Mongolia is as high as 2000ppb (Smedley, 2002; Sun Tianzhi, 1994). The European Union and the United States have re-established the sanitary standards for arsenic in drinking water,...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30
Inventor 陈甫华郭学军
Owner NANKAI UNIV
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