A process for functionalized MOFs adsorbent to enhance ceramic membrane separation

A ceramic membrane and adsorbent technology, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high maintenance and operation costs, low adsorption capacity, easy pollution, etc. problems, to reduce the risk of entering the ecosystem, realize the regeneration cycle, and facilitate industrialization

Active Publication Date: 2019-12-17
殷娜
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Among them, the adsorption method is more commonly used, but there are disadvantages such as low adsorption capacity, easy pollution, poor oxidation resistance or biological stability (biosorption), difficult regeneration, and high cost; The potential to remove heavy metal ions is quite advantageous, but the membrane fouling makes the membrane life short, the flux is low, the maintenance and operation costs are high, and the use is limited.

Method used

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  • A process for functionalized MOFs adsorbent to enhance ceramic membrane separation

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Effect test

Embodiment 1

[0028] Electroplating industrial wastewater contains low-concentration, highly toxic mixed heavy metal ions copper (Cu) and nickel (Ni), the concentrations are 25mg / L and 20mg / L respectively, the content of amino-functionalized MOFs is 1g / L, the control pressure is 0.1MPa, and the temperature is 20 ℃, ceramic membrane pore size 200nm, cross-flow velocity 4m / s, permeate volume 600L / m 2 / h, pH=3~6, the rejection rate of MOFs is 100%, the removal rate of copper and nickel ions is 100%, and the adsorption capacity of MOFs for copper and nickel ions is as high as 60mg / g. Adjust the pH to the neutral range after adsorption, MOFs are 100% intercepted, but copper ions are desorbed from the MOFs adsorbent into the solution, and eluted with pure water to obtain copper ion solution and Ni-MOFs solution, then adjust the pH To the alkaline range, nickel ion solution and MOFs solution are obtained, and the heavy metal ion products copper and nickel are respectively obtained by extraction, w...

Embodiment 2

[0030] In the analytically pure heavy metal ion solution of lead nitrate, the concentration is 30mg / L, pH=7~8, the content of amino-functionalized MOFs is 0.1g / L, the pore size of the ceramic membrane is 50nm, the control pressure is 0.15MPa, the temperature is 40°C, and the cross-flow velocity is 6m / s, permeation flux 770L / m 2 / h, the retention rate of MOFs is 100%, the removal rate of lead ions is close to 100%, and the adsorption capacity of MOFs to lead ions is as high as 300mg / g. After adsorption, the pH is adjusted to the acidic range, and the retention rate of MOFs is still 100%, but the lead ions are desorbed from the MOFs adsorbent into the solution, and eluted with pure water to obtain lead ion solution and MOFs solution, cooling and crystallization, and the product lead The purity of the salt is 99%, the yield is 90%, and the obtained MOFs can be recycled.

Embodiment 3

[0032] Industrial wastewater containing heavy metal ions cadmium, the concentration is 1.1μg / L, the content of amino-functionalized MOFs is 0.001g / L, the control pressure is 0.2MPa, the temperature is 60°C, the pore size of the ceramic membrane is 20nm, the cross-flow velocity is 2m / s, and the permeate volume is 300L / m 2 / h, pH=5~6, the interception rate of MOFs is 100%, the removal rate of cadmium ions reaches 100%, and the adsorption capacity of MOFs to cadmium ions is as high as 30mg / g. After adsorption, adjust the pH to the neutral range, MOFs are still 100% intercepted, but cadmium ions are desorbed from the MOFs adsorbent into the solution, and eluted with pure water to obtain cadmium ion solution and MOFs solution, and the heavy metal ion product cadmium is obtained by extraction , the yield is 90%, and MOFs are obtained at the same time, which can be recycled.

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Abstract

The invention provides recycling treatment of heavy metal wastewater via a novel MOF reinforced ceramic membrane technology. According to the invention, low-concentration high-toxicity heavy metals in wastewater can be efficiently adsorbed, separated and recovered; amino-functionalized MOFs are mainly used for adsorption of heavy metals, the process of adsorption is reinforced and promoted in ceramic membrane equipment in virtue of dynamic cross flow, and the electron-withdrawing capability of heavy metals is regulated and controlled via a pH value so as to realize continuous high-selectivity adsorption and separation of target heavy metals; a penetrating fluid and a trapped fluid are obtained after filtering, and concentration of MOFs-heavy metals in the trapped fluid is realized by continuously transferring the penetrating fluid free of heavy metals out of a system; then the concentrated trapped fluid is subjected to desorption under the condition of adjustment of a pH value so as to realize elution of heavy metals, and the obtained eluate is an ionic solution of the target heavy metals, so subsequent recovery of the heavy metals is facilitated; and the concentrate undergoes washing under a high-flux condition so as to obtain a high-purity MOF solution which can be cyclically applied for continuous adsorption of heavy metals.

Description

technical field [0001] The invention relates to a functionalized MOFs adsorbent enhanced ceramic membrane separation technology, which belongs to the technical field of separation and recovery of multi-component industrial pure or reagent pure product solutions or actual industrial heavy metal wastewater. Background technique [0002] Metallurgy, dyestuffs, tanning, electroplating, batteries and many other industrial processes involve the discharge of a large amount of industrial wastewater containing heavy metal ions, causing serious pollution to the environment. The accumulation of heavy metal ion pollutants to a certain extent will affect the contacted water, plants, and animal systems. At the same time, it is extremely harmful to the health of human beings through the food chain. Typical heavy metal ions include cadmium (Cd), lead (Pb), copper (Cu), nickel (Ni) and the like. Cadmium forms cadmium-sulfur protein in the human body, and the "target organ" of poisoning is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02
Inventor 殷娜王珂郭春燕
Owner 殷娜
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