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Organic-inorganic composite materials for the removal of anionic pollutants from water and methods for their preparation

A technology of inorganic composite materials and anionic pollutants, applied in water/sewage treatment, chemical instruments and methods, adsorption of water/sewage treatment, etc.

Inactive Publication Date: 2016-05-04
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0060] Issues requiring electricity and / or specialized reactors / equipment to remove anionic contaminants from drinking water

Method used

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  • Organic-inorganic composite materials for the removal of anionic pollutants from water and methods for their preparation
  • Organic-inorganic composite materials for the removal of anionic pollutants from water and methods for their preparation
  • Organic-inorganic composite materials for the removal of anionic pollutants from water and methods for their preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] 4.63g of alum (commercial grade) was dissolved in 25ml of distilled water. 3 g of chitin was added to the alum solution, and the mixture was shaken on a horizontal rotary shaker for 4 hours. The mixture was transferred to a porcelain dish and dried in an oven at 110°C for 3 hours and calcined in a muffle furnace at 450°C for 6 hours. The calcined material was then ground in a mortar and washed with distilled water at a ratio of 1:20 (material:distilled water) by shaking on a horizontal rotary shaker. Finally the material was dried in an oven at 70°C for 4 hours.

[0149] The C-supported alumina was evaluated for the removal of fluoride from water by mixing the desired amount of sorbent in a 250 ml PVC Erlenmeyer flask with 100 ml of test fluid at room temperature (25°C±3°C). These flasks were shaken with the test fluids and sorbents on a horizontal rotary shaker to investigate various control parameters. The dosage of adsorbent was changed between 0.01g / 50ml~0.3g / 50m...

Embodiment 2

[0157] The same synthetic protocol as described in Example 1 was repeated to synthesize the crab shell waste based adsorbent. A composite adsorbent was synthesized by using crab shells as a substitute for chitin. The synthesized composite adsorbents were evaluated for the removal of fluoride from drinking water and the results are shown in Table 3.

Embodiment 3

[0159] The same synthetic protocol as described in Example 1 was repeated to synthesize the leaf-based adsorbent. A composite adsorbent was synthesized by using leaves as a substitute for chitin. The optimum alumina loading in the case of leaf-based sorbents was 50% by weight. The synthesized leaf-based sorbent was evaluated for fluoride removal from drinking water and the results are shown in Table 3.

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Abstract

Organic-inorganic composite material based on metal oxide and carbon, nitrogen and other elements / functional groups for removal of anionic pollutants like arsenic, fluoride etc., from water, and methods for making the same are disclosed. The modified composition may comprise different phases of metal oxides, supported or promoted by incorporation of nitrogen, carbon and other elements / groups. The organic-inorganic composite may be produced from at least one biogenic material such as chitin, chitosan, leaf, bio-membrane and a salt of metal like iron, aluminium etc. The organic-inorganic composite based adsorbent shows arsenic uptake capacity in the range of 0.2 to 1.3 mg / g and fluoride uptake capacity in the range of 5-50 mg / g under different conditions, which is substantially high from the other adsorbents known so far. A breakthrough regeneration of 98-99% has been achieved by using new regeneration protocol.

Description

technical field [0001] The present invention relates to organic-inorganic composite materials for the removal of anionic pollutants from water. [0002] The present invention also relates to a method of synthesizing an organic-inorganic composite material showing high removal efficiency for arsenic and fluoride, composed of metals supported or facilitated by the introduction of nitrogen, carbon and other elements / functional groups The different phase composition of the oxides shows enhanced affinity and selectivity for arsenic and fluoride in water. [0003] The present invention also relates to the synthesis of organic-inorganic composite materials using carbon sources such as biopolymers (such as chitin, chitosan and various low-cost carbon sources, such as dried leaves, onions, banana peels, citrus and crab shells, etc.) method, the organic-inorganic composite material is used to remove arsenic and fluoride from surface water, wastewater and drinking water. Background te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/08C02F1/28B01J20/24
CPCB01J20/06B01J20/08B01J20/24B01J2220/46C02F1/281C02F1/288Y02W10/37
Inventor S·S·拉亚卢N·K·拉布哈斯特瓦尔A·K·巴斯瓦尔D·K·哈克尔S·M·贾格塔普
Owner COUNCIL OF SCI & IND RES