Synthesis Of MOF Materials From Stainless Steel Pickling Wastewater

Metal Organic Framework（MOF）materials have been widely used in catalysis,separation,and degradation due to their advantages such as large specific surface area and porosity,good water stability,and controllable structure.However,its high production costs limit its large-scale use.The synthetic raw materials for MOF materials include metal salts,organic ligands,solvents,and acid-base regulators.Reducing the cost of raw materials,especially replacing commercial reagents with industrial waste,is one of the effective ways to reduce the overall cost of MOF materials.Stainless steel pickling wastewater contains a large amount of heavy metal ions and anions,and also has extremely strong acidity.Currently,there are multiple methods used to treat this wastewater,but there are few methods that can effectively utilize metal ions in the wastewater to manufacture products with high added value.We found that the metal ions,water,and acid in stainless steel pickling wastewater are matched with the metal source,reaction solvent,and regulator of MOF material synthesis,respectively,which can serve as a potential substitute for MOF material synthesis.Therefore,this study focuses on the synthesis of MOF materials and their derivatives using acid washing wastewater as raw material.The specific research content is as follows:1.MOF materials were successfully synthesized using stainless steel pickling metal wastewater as raw material,combined with benzoic acid（BTC）.And it can be successfully synthesized at temperatures ranging from 180 to 220°C and solid-liquid ratios ranging from 50 to 750g/L.We will name the synthesized material BTC-X-Y（where X represents the solid-liquid ratio and Y represents the synthesis temperature）.After characterizing the material,we determined the successful synthesis of the material.During the experiment,we found that the concentration of nickel ions in the wastewater after synthesizing the material was actually higher than before.Therefore,we are trying to improve the purity of nickel ions in the wastewater after synthesizing materials.After experiments,the purity of nickel ions in wastewater after synthesizing materials can reach up to 98%.This work provides a different approach for purifying nickel ions in stainless steel pickling wastewater while successfully synthesizing MOF materials.2.After obtaining all the materials,a large number of experiments were conducted to verify their adsorption capacity.Finally,it was found that the material had excellent adsorption capacity for the dye methylene blue,the antibiotic moxifloxacin and zirconium oxychloride.Among all twelve materials,BTC-250-180 material has the highest adsorption capacity.This may be due to its large specific surface area and strong electronegativity.In this work,the properties of materials synthesized from stainless steel pickling wastewater were explored,and their adsorption capacity for methylene blue,moxifloxacin and zirconium oxychloride was found.3.After determining the composition of the material,we attempted to calcine it.After calcination in a tubular furnace,we name the resulting material as BTC-X-Y@Z（X represents the solid-liquid ratio,Y represents the reaction temperature,and Z represents the calcination temperature）.The characterization of the obtained material resulted in the conclusion that the material is composed of metal oxides and carbon materials and possesses magnetism.After its adsorption capacity had been explored,it was found that the material has excellent adsorption capacity for tetracycline.After conducting experiments on the factors affecting material adsorption,it was found that the material has a higher adsorption capacity in the environment with p H=4,higher temperature,and higher solution concentration.Through a pseudo second-order kinetic model,it was determined that this adsorption belongs to chemical adsorption.The best performing material among them is BTC-250-200@900 The maximum adsorption capacity of this material can reach 361 mg·g^-1.This work obtained a magnetic carbon material with excellent adsorption capacity for tetracycline by calcining the material obtained from stainless steel pickling wastewater.