Study On Mg-MOFs For Adsorption Wood Drying VOCs

With the continuous improvement of my country's social economy,the industrial development has brought benefits to society,and it also discharged a large number of organic exhaust gases.Among them,the exhaust gas containing VOCs is a more serious,which not only pollutes the air environment,but also give people health has brought serious hazards,so that atmospheric pollution caused by volatile organic matter has become one of the focus issues of today's common attention.During wood processing,wood dry as the first step of production,and will always be accompanied by the production of a particular VOCs exhaust gas.This thesis selects the relatively high VOCs content in the wood drying process,which is the main research object,according to the molecular structure and chemical properties of four gases according to the four gases.Two new alkaline earth metal-organic skeleton adsorbed materials Mg-MOFs-IMA-1 and Mg-MOFs-IMA-2 were designed,and the above four VOCs gases were removed.The main research work and the content are as follows:1.The alkaline earth metal Mg is used as the center ion,and the reaction is reacted with ligand(i.e.,4-pyridinic acid)under anhydrous ethanol,and prepared a new type of single crystal adsorbent material[Mg(Ina)₂]_n,named Mg-MOFs-IMA-1.The structural analysis is found to find that the molecular structure of the material belongs to a single allantin system,which is a microporous material.The Mg-MOFs-IMA-1 single crystal material is characterized by means of a transmissive electron microscope,a specific surface area,and the like,and the material exhibits good thermal stability.2.The alkaline earth metal Mg is used as the ion center,and the main ligand 2,2'-bisin-4,4'-dimethic acid(i.e.,4,4'-bispyridine dicarboxylic acid),at the same time at the auxiliary ligand N,N-Successfully prepared a new type of micron-stage 3D complex[Mg(Bpdc)(DMF)₂]_n,named Mg-MOFs-IMA-2.The material was subjected to a single crystal structure analysis,and it was found that its molecular structure belongs to a single allantin system,a pore size of 15.733(?)×23.736(?),belonging to a mesh material.The Mg-MOFs-IMA-2 single crystal material is characterized by means of transmitting electron microscopy,specific surface area and other techniques,and materials exhibit good thermal stability in medium and high temperature environments.3.Two new types of single crystal adsorbent materials are used to adsorb the specific four VOCs released by domestic Pinus sylvestris var.mongolica Litv during the high temperature/normal temperature drying process.In the adsorbing process,there are both physical adsorption and chemical forces.The maximum adsorption capacity of Mg-MOFs-IMA-1 adsorption material for?-pinene is 10.854mg/g;the maximum adsorption capacity for?-pinene is 2.275mg/g;the maximum adsorption capacity for benzene is 8.285mg/g;The maximum adsorption capacity of carbon tetrachloride is 8.354mg/g.The maximum adsorption capacity of Mg-MOFs-IMA-2adsorption material for?-pinene is 18.316mg/g;the maximum adsorption capacity for?-pinene is 144.418mg/g;the maximum adsorption capacity for benzene is 182.261mg/g;The maximum adsorption capacity of carbon tetrachloride is 19.602mg/g.There are differences in the adsorption capacity of the two adsorbents for the four gases,which is due to the different pore sizes of the Mg-MOFs-IMA-1 and Mg-MOFs-IMA-2materials.During the adsorption process,the adsorption mechanism of the four VOCs gases and the adsorption material is different,and the amount of adsorbent material to the four gases is different due to the size of the gas size.The test results show that the two new adsorbents have good adsorption properties on?-pinene,?-pinene,benzene and carbon tetrachloride.