ZIF-derived Nitrogen-doped Porous Carbons For Highly Efficient Removal Of Organic Compounds From Wastewater

At present,water pollution,especially organic wastewater has brought a series of hazards to human life and health.Methylene blue(MB)is a widely used organic dyes in industrial production,a large proportion of important components in organic wastewater treatment.Accordingly,it is significant to study the removal of MB in Wastewater.ZIF-derived N-doped porous carbons with high specific surface area,controllable pore structure and micro-morphology,have attracted wide attention in the fields of electrochemistry,gas storage and separation.In this paper,ZIF was used as a precursor template material to prepared ZIF-derived N-doped porous carbons.The MB removal efficiency of organic wastewater was also further studied.The main contents are as follows:The contents and results of this research are:using ZIF-8 as a template,,to prepare three ZIF-derived N-doped porous carbon(Carbon-Z,Carbon-ZS and Carbon-ZD)by directly carbonizing or mixing with different second C/N resources and further investigate their performance of removing MB from wastewater.The experimental results indicate that MB saturated adsorption capacities of Carbon-ZD,Carbon-ZS,Carbon-Z are 1148.2,791.3 and 505.3 mg/g,respectively,which means that Carbon-ZD is a better MB adsorbent,compared to the other two.Moreover,when the excessive adsorbents are used to treat wastewater containing MB pollutant,Carbon-ZD can almost completely remove the MB pollutant,because the removal percent of Carbon-ZD is almost 100%,which means that Carbon-ZD is an excellent candidate for MB removal from wastewater.Most importantly,further experiments indicate that Carbon-ZD also possesses excellent regeneration and reusability,as well as anti-interference ability when MO and MB pollutants coexist in wastewater.To explore adsorption kinetic and thermodynamics,we also found that the pseudo-second order model can satisfyingly describe MB adsorption kinetics and the Langmuir model can well describe MB adsorption isotherm.The excellent performance of Carbon-ZD for MB removal from wastewater is mainly attributed to the high BET specific surface area,suitable pore size distribution and nitrogen-doping.It is expected that the strategy of rationally designing ZIF or MOF template to prepare nitrogen-doped porous carbon adsorbents can open a new way to develop highly efficient adsorbents for removing pollutants in wastewater.