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Co2-enabled regeneration and reuse of responsive adsorbents

A technology for adsorbing materials and pollutants, which is applied in the field of CO2-triggered switchable adsorption and desorption, and can solve the problem that PEI is not suitable for large-scale industrial use.

Inactive Publication Date: 2019-05-03
NANYANG TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes PEI unsuitable for large-scale industrial use

Method used

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  • Co2-enabled regeneration and reuse of responsive adsorbents
  • Co2-enabled regeneration and reuse of responsive adsorbents
  • Co2-enabled regeneration and reuse of responsive adsorbents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] As one of the most common types of heavy metal pollution widely present in wastewater sources in the electronics, paint, wiring, and printing industries, copper is selected in this example to illustrate the CO 2 Auxiliary adsorption and desorption processes. In addition, according to the complexation mechanism of polymers and metals, Cu 2+ 、Cd 2+ , Pb 2 , Pb 4+ 、Cr 3+ 、Co 2+ 、Ni 2+ , Zn 2+ A variety of other multivalent chelatable heavy metals can also be used in the present embodiment method (as shown in Example 3 below).

[0077] to CO 2 Auxiliary Cu 2+ The removal process and the adsorbent regeneration process are described. Among them, the linear and star-shaped PDMAEMA were dissolved in 0.1M NaNO 3 solution and adjust the pH to approximately 5.5. By adding Cu(NO 3 ) 2 "6H 2 O dissolved in 0.1M NaNO 3 , made of Cu 2+ solution, used as a waste water substitute. The 0.1M NaNO 3 As used to stabilize the solution and obtain accurate Cu in the experime...

Embodiment 2

[0079] As a typical adsorption capacity determination method, 1mmol / L Cu(NO 3 ) 2 The solution was continuously injected with 10 mL of a 0.268 mg / mL PDMAEMA solution which had been adjusted to the desired pH prior to injection. At the same time, Cu-ISE and pH electrodes are also used to continuously measure Cu 2+ Concentration and pH. During this process, the N 2 Continuously bubble through the solution to stabilize the pH and avoid atmospheric CO 2 Impact. Adsorption capacity (Q e ) is calculated according to the following formula:

[0080]

[0081] Among them, C 0 is the total concentration of copper, C v is the measured free Cu 2+ Concentration, V is the solution volume, m is the mass of adsorbent polymer.

[0082] at 25°C with N 2 While purging, by adding a designed amount of Cu(NO 3 ) 2 solution to determine the adsorption isotherm. In this way, during the addition, different polymer / Cu ratios can be achieved and the corresponding Cu measured by Cu-ISE 2...

Embodiment 3

[0086] In the following examples, in addition to Cu 2+ In addition, several other metal ions were tested. These metal ions are Cd 2+ , Zn 2+ , Pb 2+ 、Cr 3+ and Ni 2+ , and in order to simulate the actual wastewater treatment conditions, the ultrafiltration step in the evaluation process does not use NaNO 3 Ionic background.

[0087] In this method, in order to avoid the formation of anionic coordination bonds, all metal salts are nitrates. As a typical method, metal nitrate and star-shaped PDMAEMA (POSS-PDMAEMA) were first dissolved in DI water at concentrations of 0.4mmol / L and 27.3mg / L to form two identical solutions, respectively. The pH of each solution was adjusted to 5.5. Among them, the molar ratio of [metal]:[DMAEMA unit] is about 2.5:1, and the excess of the metal relative to the polymer ensures that the maximum adsorption capacity is obtained in the equilibrium state. Before reaching adsorption or desorption equilibrium by filtration, one of the same solutio...

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Abstract

This invention relates to a switchable adsorption and desorption process triggered by carbon dioxide (CO2) to remove contaminants such as heavy metal ions using CO2-responsive adsorbent materials forwater purification. The method comprising the steps of: (a) contacting a wastewater that comprises at least one contaminant with a polymeric adsorbent material, which comprises CO2-responsive functional groups that are in a form capable of complexing the at least one contaminant; (b) separating the adsorbent-contaminant complexes from the wastewater; (c) bubbling CO2 into the concentrated aqueoussolutions of such complexes to regenerate the polymeric adsorbent material by releasing the contaminant from the polymeric adsorbent material, wherein the CO2-responsive functional groups are in a CO2-replete form; (d) separating the released contaminants from the polymeric adsorbent material. The pKb of the polymeric adsorbent material is from 7.5 to 9.0. The CO2-responsive polymeric adsorbent materials disclosed herein can be complex, released and be regenerated without the need for heat or acid to be introduced into the decomplexation or regeneration steps.

Description

technical field [0001] The present invention relates to the use of CO 2 CO Response Adsorbent Materials Remove Pollutants such as Heavy Metal Ions to Purify Water 2 Triggered switchable adsorption and desorption methods, especially involving the utilization of CO 2 Realize the recovery or regeneration of the adsorption material. Background technique [0002] The listing or discussion of a prior published document in this specification is not necessarily to be regarded as an acknowledgment that the document is part of the prior art or common general knowledge. [0003] In recent decades, booming battery, electronics, mining, and numerous other industries have resulted in widespread heavy metal pollution, including copper, lead, and cadmium, in farmland soil, lakes, rivers, and even groundwater. These toxic metal elements can accumulate in organisms and, even at extremely low exposure levels, can cause cellular dysfunction, genetic diseases, and enzyme deficiencies. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/68B01J20/34B01J49/00
CPCB01J20/261B01J20/28033B01J20/3458C02F1/285C02F1/38C02F1/444C02F1/488C02F1/683B01J20/3425C02F2001/007C02F2101/20C02F2101/301C02F2101/306C02F2101/308C02F2303/16C02F2303/18
Inventor 胡晓白毓梁颖南
Owner NANYANG TECH UNIV
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