Study Onmodified Materials Of Glass Fiber In Waste Printed Circuit Board

Waste printed circuit board?WPCB?is an electronic waste.With the rapid development of technology,more and more electronic waste is generated due to the replacement of electronic products,and the environment is polluted.Glass fiber is an inorganic non-metallic part of waste printed circuit boards,which accounts for a large proportion in non-metallic parts,and there is little research on its recycling at home and abroad.At present,the recycling method of the waste printed circuit board method,especially the non-metal part,is still immature,and there are many problems such as high cost,difficulty in recycling the environment,and secondary pollution.In addition to our current social environment,water resources have become the focus of attention,especially heavy metal polluted wastewater.The adsorption method is often used for the treatment of heavy metal wastewater,but the choice of adsorbents often has problems such as high price and difficult material availability.Therefore,it is important for us to find a material that is easy to obtain,inexpensive,and superior in adsorption performance.This paper combines the above questions,the non-metallic part of the glass fiber in the waste printed circuit board is used as the matrix material to prepare two kinds of chelating materials which adsorb the heavy metal ions,and the glass fiber is modified.The first one is to prepare a thiol-based chelate material MPTS-WPCB,which is modified with?-mercaptopropyltrimethoxysilane to activate the glass fiber.The second is a new type of MAA-WPCB adsorbent synthesized by amination of the parent material with?-aminopropyltrimethoxysilane and functional grafting with methacrylic acid.The effects of reaction time,reaction temperature,feed ratio and initiator dosage on the preparation of the materials were studied by single factor and orthogonal experiments,and the optimal preparation conditions were determined.The reaction temperature of MPTS-WPCB was 80?,the reaction time was 14 h,and the adsorption performance of 2%?-mercaptopropyltrimethoxysilane were the best.The reaction temperature of MAA-WPCB were 50?,the reaction time was 14 h,and the adsorption performance of 4%methacrylic acid and 1.1%initiator ammonium persulfate was the best.The structure of the before and after modification of the two materials were characterized by Fourier transform infrared spectroscopy?FTIR?and scanning electron microscopy?SEM?.The nuclear magnetic resonance spectrum?13C NMR?,elemental analysis?EA?and re-use performance of the modified materials were investigated to confirm the successful synthesis of the modified materials.The optimum adsorption conditions were obtained by adsorption of MPTS-WPCB and MAA-WPCB materials on wastewater containing Ag⁺,Pb²⁺and Cu²⁺under different adsorption temperatures,adsorption time,pH and initial concentration of solution,and explored the adsorption mechanism of the two materials.The adsorption processes of Ag⁺,Pb²⁺and Cu²⁺by MPTS-WPCB and MAA-WPCB were in line with the quasi-secondary kinetics model and were spontaneous endothermic reactions.The adsorption of two metal ions on Ag⁺and Pb²⁺is line with the Langmuir model,and the adsorption of Cu²⁺is more in line with the Freundlich model.