Method for rapidly removing chloride ions in wastewater by using bismuth-based metal organic framework material

An organic framework and metal-based technology, applied in the field of wastewater treatment in environmental protection, can solve the problems of long time consumption, low chlorine removal efficiency, consumption, etc., and achieve the effect of fast reaction rate, high chlorine removal efficiency, and large specific surface area

Active Publication Date: 2022-08-02
MINJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have the following disadvantages: low chlorine removal efficiency, long time consumption, additional energy consumption, etc.

Method used

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  • Method for rapidly removing chloride ions in wastewater by using bismuth-based metal organic framework material
  • Method for rapidly removing chloride ions in wastewater by using bismuth-based metal organic framework material
  • Method for rapidly removing chloride ions in wastewater by using bismuth-based metal organic framework material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Removal of chloride ions by bismuth-based MOFs in simulated wastewater at pH=1

[0033] (1) According to the molar ratio of material to chloride ion, Bi 3+ / Cl - =1.5:1, weighing 0.6421 g of bismuth-based MOFs material sample;

[0034] (2) Take 10 mL of simulated waste liquid with an initial chloride ion concentration of 3500 mg / L and pH=1, put it into a 20 mL small glass bottle, add magnetons, and weigh the bismuth-based MOFs material sample. Add to the simulated waste liquid and stir at 500 rpm;

[0035] (3) Sampling according to different times, namely 1 minute, 2 minutes, 3 minutes, 5 minutes, 10 minutes, 20 minutes, 2 hours and 4 hours;

[0036] (4) Centrifuge the dechlorinated sample at a centrifugal speed (5000 rpm, 5 min), aspirate the supernatant, and use 0.01mol / L AgNO 3 The solution is titrated, as shown in the figure 2 As shown in a, the removal efficiencies of para-chloride ions were 80.3%, 82.2%, 83.8%, 85.3%, 89.1%, 89.7%, 92.5%, and 92.7% at the abov...

Embodiment 2

[0038] Removal of chloride ions by bismuth-based MOFs in simulated wastewater at pH=1

[0039] (1) According to the molar ratio of material to chloride ion, Bi 3+ / Cl - =1:1, weigh 0.4281 g of bismuth-based MOFs material sample;

[0040] (2) Take 10 mL of simulated waste liquid with an initial chloride ion concentration of 3500 mg / L and pH=1, put it into a 20 mL small glass bottle, add magnetron, and weigh the bismuth-based MOFs material sample. Add to the simulated waste liquid and stir at 500 rpm;

[0041] (3) Sampling according to different times, namely 1 minute, 2 minutes, 3 minutes, 5 minutes, 10 minutes, 20 minutes, 2 hours and 4 hours;

[0042] (4) Centrifuge the dechlorinated sample at a centrifugal speed (5000 rpm, 5 min), aspirate the supernatant, and use 0.01mol / L AgNO 3 The solution is titrated, as shown in the figure 2 As shown in b, the removal efficiencies of para-chloride ions were 78.8%, 79.1%, 81.4%, 83.9%, 85.3%, 86.6%, 88.7%, and 89.9% at the above t...

Embodiment 3

[0044] Removal of chloride ions by bismuth-based MOFs in simulated wastewater at pH=1

[0045] (1) According to the molar ratio of material to chloride ion, Bi 3+ / Cl - =0.5:1, weighing 0.2141 g of bismuth-based MOFs material sample;

[0046] (2) Take 10 mL of simulated waste liquid with an initial chloride ion concentration of 3500 mg / L and pH=1, put it into a 20 mL small glass bottle, add magnetron, and weigh the bismuth-based MOFs material sample. Add to the simulated waste liquid, and stir at a speed of 500 rpm;

[0047] (3) Sampling according to different times, namely 1 minute, 2 minutes, 3 minutes, 5 minutes, 10 minutes, 20 minutes, 2 hours and 4 hours;

[0048] (4) Centrifuge the dechlorinated sample at a centrifugal speed (5000 rpm, 5 min), aspirate the supernatant, and use 0.01mol / L AgNO 3 The solution is titrated, as shown in the figure 2 As shown in c, the final removal efficiency for chloride ions is 36.2%.

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Abstract

The invention provides a method for rapidly removing chloride ions in wastewater by using a bismuth-based metal organic framework material. According to the method, soluble bismuthate and non-toxic organic acid are utilized to form a porous bismuth-based metal organic framework material as a dechlorination reagent, the bismuth-based MOFs material is added into chlorine-containing wastewater, the pH value and stirring time of the wastewater are adjusted, the molar ratio of bismuth ions to chloride ions is controlled, and qualified filtrate with low-concentration chlorine content and a bismuth oxychloride product are obtained after filtration.

Description

technical field [0001] The invention relates to a method for rapidly removing chloride ions in wastewater based on a bismuth-based metal organic framework (MOFs) material, which achieves high-efficiency, energy-saving and low-cost treatment effects, and belongs to the field of wastewater treatment in environmental protection. Background technique [0002] Chloride ion pollution has become a growing environmental problem, with harmful effects on agricultural irrigation and fisheries that cannot be ignored. High concentrations of chlorine in wastewater usually produced by industrial processes such as non-ferrous metal smelting, tanning, and inland seawater desalination, in the process of industrial development, various wastewaters that are harmful to the environment and humans are discharged, involving serious environmental problems. From the perspective of pollution treatment, the removal of pollutants in the environment is of great significance. Many methods for removing ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C08G83/00C02F101/12
CPCC02F1/58C08G83/008C02F2101/12Y02A20/131Y02W10/37
Inventor 王军邓楚楚郑标李玉良
Owner MINJIANG UNIV
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