Adsorption And Removal Of Antibiotics And Dyes In Water By Metal-Organic Frameworks

The treatment of wastewater has become a worldwide concern due to the increasing development of human society and the detection of excessive amounts of harmful molecules such as antibiotics and dyes in more and more water bodies.These harmful pollutants are relatively stable in water and have carcinogenic and teratogenic effects on humans,animals and plants.More importantly,the increase in antibiotic residues in the environment can lead to an increase in drug resistance,which has a negative impact on the environment and human health.The treatment of wastewater has attracted wide attention worldwide.At present,there are a variety of methods used in the treatment of wastewater,such as adsorption method,biological method,catalytic degradation method,the adsorption technique is used in the field of adsorption for the removal of harmful molecules in wastewater because of its cheap and efficient characteristics.Metal-organic frameworks,also known as MOFs,are new porous materials consisting of inorganic metals and organic ligands.With their high specific surface area,high porosity and ease of chemical modification,they have been successfully used for the adsorption and removal of pollutants from water.This paper mainly focuses on the application of MOFs in liquid phase adsorption,the specific content is as follows:1.Cu-ZIF-8-1 was prepared by impregnation method.It was found that Cu-ZIF-8-1 had a higher adsorption capacity for OFX,up to 599.96 mg·g^-1,which was 4.2 times that of ZIF-8,and higher than that of most reported adsorbents.Experiments show that complexation and electrostatic interactions are the main reasons for the large adsorption capacity of Cu-ZIF-8-1 for OFX,and that the strong interaction between Cu and OFX plays an important role in the adsorption process.At the same time,π-πinteraction may also promote the removal of OFX.And Cu-ZIF-8-1 also has good regeneration and interference resistance.The results of this study not only indicate that Cu-ZIF-8-1 can be used as a potential adsorbent for OFX and even PPCPs,but also provide a new idea for the design and construction of efficient new adsorbents.2.MIL-101（Cr）and MIL-101-SO₃H were synthesized by direct method and used for adsorption and removal of MV from wastewater.The experimental results show that the adsorption capacity of MIL-101-SO₃H is much greater than that of MIL-101（Cr）,reaching 663.93 mg·g^-1,which is greater than that of most existing adsorbents.And the adsorption rate is very fast,99%of the pollutants can be removed in 2 minutes,and the adsorption equilibrium can be reached in 15 minutes.This can be attributed to the large pore size of the material itself and the strong electrostatic interaction of cationic dyes.Meanwhile,theπ-πinteraction may also promote the removal of MV.MIL-101-SO₃H also has good regeneration and interference resistance.All the results show that MIL-101-SO₃H is a potential adsorbent for removing MV from wastewater.3.In this work,MIL-101（Fe）was synthesized and defectived MIL-101（Fe）-HAC was synthesized by acetic acid modification and applied to the removal of TC from wastewater.The results showed that the adsorption capacity of MIL-101（Fe）modified by acetic acid was greater than that of MIL-101（Fe）,and greater than that of most existing adsorbents.And a comparison experiment was conducted,the comparison between UiO-66 doped with Fe and ordinary UiO-66 adsorption TC and the obvious shift of Fe peak in XPS have proved that Fe plays a very important role in adsorption.More active sites can be exposed through acetic acid modification,which is beneficial to adsorption.MIL-101（Fe）-HAC also has good regeneration and interference resistance.The results showed that MIL-101（Fe）-HAC was an efficient TC adsorbent.