Method for preparing hexavalent chromium ion adsorbent from alocasia macrorrhiza as raw material

A hexavalent chromium ion and adsorbent technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of low adsorption capacity of hexavalent chromium ions and achieve production costs Low, high-efficiency removal effect, the effect of less processing steps

Active Publication Date: 2019-01-11
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption capacity of its material for hexavalent chromium ions is not high, and the maximum adsorption capacity is less than 10mg / g

Method used

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  • Method for preparing hexavalent chromium ion adsorbent from alocasia macrorrhiza as raw material
  • Method for preparing hexavalent chromium ion adsorbent from alocasia macrorrhiza as raw material
  • Method for preparing hexavalent chromium ion adsorbent from alocasia macrorrhiza as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Cut the calla lily plant into sections, freeze-dry it for later use, and obtain the Original AM;

[0045] (2) Pretreatment of calla lily: boil the freeze-dried calla lily (AM) in distilled water at 100°C for 12 hours to remove soluble organic matter, dry at 80°C for 12 hours to remove excess water, take the dried calla lily and add Stir in 100mL 10% NaOH solution, then place in 100mL 60% H 2 SO 4 Agitation in the solution removes hemicellulose and lignin, and exposes more surface functional groups. Rinse to neutrality with a large amount of distilled water, obtain pretreated calla lily (Pre-AM) after freeze-drying;

[0046] (3) 20 mg of Pre-AM was placed in tannic acid (TA) aqueous solution, the mass ratio of Pre-AM to TA was 1:1, and the concentration of TA was 4 mg / mL. Tetraethylenepentamine (TEPA) was added dropwise under stirring, and the molar ratio of TA to TEPA was 1:3. Rinse with a large amount of distilled water after stirring at room temperature for 24...

Embodiment 2

[0048] (1) cut the calla lily plant into sections, freeze-dry and set aside;

[0049] (2) Pretreatment of calla lily: boil the freeze-dried calla lily (AM) in distilled water at 100°C for 12 hours to remove soluble organic matter, dry at 80°C for 12 hours to remove excess water, take the dried calla lily and add Stir in 100mL 10% NaOH solution, then place in 100mL 60% H 2 SO 4 Agitation in the solution removes hemicellulose and lignin, and exposes more surface functional groups. Rinse to neutrality with a large amount of distilled water, obtain pretreated calla lily (Pre-AM) after freeze-drying;

[0050] (3) 20 mg of Pre-AM was placed in tannic acid (TA) aqueous solution, the mass ratio of Pre-AM to TA was 1:1, and the concentration of TA was 2 mg / mL. Tetraethylenepentamine (TEPA) was added dropwise under stirring, and the molar ratio of TA to TEPA was 1:3. Stir at room temperature for 24 hours, rinse with a large amount of distilled water, and freeze-dry to obtain Pre-AM-...

Embodiment 3

[0052] (1) cut the calla lily plant into sections, freeze-dry and set aside;

[0053] (2) Pretreatment of calla lily: boil the freeze-dried calla lily (AM) in distilled water at 100°C for 12 hours to remove soluble organic matter, dry at 80°C for 12 hours to remove excess water, take the dried calla lily and add Stir in 100mL 10% NaOH solution, then place in 100mL 60% H 2 SO 4 Agitation in the solution removes hemicellulose and lignin, and exposes more surface functional groups. Rinse to neutrality with a large amount of distilled water, obtain pretreated calla lily (Pre-AM) after freeze-drying;

[0054] (3) 20 mg of Pre-AM was placed in tannic acid (TA) aqueous solution, the mass ratio of Pre-AM to TA was 1:10 and the concentration of TA was 4 mg / mL. Tetraethylenepentamine (TEPA) was added dropwise under stirring, and the molar ratio of TA to TEPA was 1:1. Stir at room temperature for 24 hours, rinse with a large amount of distilled water, and freeze-dry to obtain Pre-AM-...

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Abstract

The invention relates to a method for preparing a hexavalent chromium ion adsorbent from alocasia macrorrhiza as a raw material. The method comprises: adding pretreated alocasia macrorrhiza (Pre-AM),tannic acid (TA) and tetraethylene pentamine (TEPA) into water according to a certain ratio, carrying out stirring at the room temperature for a reaction for some time and carrying out drying to obtain a Pre-AM-P(TA-TEPA) composite adsorbent. Through intermolecular strong interaction, the pretreated alocasia macrorrhiza as a support structure coats a polymer. The method has simple processes, is easy to operate, has mild reaction conditions, greatly controls the dispersibility of the polymer and greatly improves the hexavalent chromium ion adsorption capacity of herbaceous plants represented byalocasia macrorrhiza. The method can be used for treatment on chromium-containing wastewater and has a wide practical application prospect.

Description

technical field [0001] The disclosure belongs to the field of polymer composite material preparation, and mainly relates to a method for preparing a hexavalent chromium ion adsorbent by using calla lily as a raw material. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Due to the maturation of the chromium industry, the irregular discharge of chromium-containing wastewater has now become a more and more serious problem. As we all know, chromium ions mainly exist in the form of hexavalent chromium and trivalent chromium ions in water, and the biological toxicity of hexavalent chromium ions is much greater than that of trivalent chromium. However, a large amount of chromium-containing wastewater discharged from the chromium industry contains hexavalent chromium ions with greater biological toxicity. Therefore, it is of great practical value and s...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/24C02F1/28C02F101/22
CPCB01J20/24B01J2220/485C02F1/28C02F1/285C02F1/286C02F2101/22
Inventor 周国伟张真瑜高婷婷刘钦泽朱耿正
Owner QILU UNIV OF TECH
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