Removal Of Pollutants Using Rapid Hydrothermal Biochar Made From Ulva Prolifera Piled Up In Beach

This paper, selected Qingdao Ulva prolifera ashore, establishes a hydrothermal method to quickly dispose Ulva prolifera. And using hydrothermal method to do some Ulva prolifera biochar. And then do the SEM+EDS analysis, FTIR analysis, TEM analysis and elemental analysis using the Ulva prolifera biochar. Then study the effect of Ulva prolifera biochar adsorbing Direct Scarlet. Ulva prolifera biochar modified by nano iron, and establish a method of iron modified. Preparing composite NZVI/C that use of Ulva prolifera biochar and nanoscale iron. And then do the SEM+EDS, TEM, FTIR, XRD characterization analysis to the NZVI/C, and do the research of removing performance of NZVI/C to the azo dye Direct Scarlet. The results show that:(1) The rapidly disposal hydrothermal method of Ulva prolifera is successful, and the Ulva prolifera biochar has rich pore structure, IR spectra shows adsorbent functional group is simple, mainly associated by-OH, C = O and C = C, C-O-C and C-C.(2) At room temperature Ulva prolifera biochar equalized adsorption time: 24 h. According to their time on the adsorption data, calculates the result of the process of the Ulva prolifera biochar adsorbs Direct Scarlet is the second-order kinetic model.(3) Adsorption process can Langmuir and Freundlich isotherm equations will be described. For Ulva prolifera biochar, the temperature increases will be conducive to adsorption, and the adsorption process is endothermic reaction.(4) Calculates of Ulva prolifera biochar adsorbing of Direct Scarlet’s Gibbs free energy, enthalpy and entropy changes, the results show that the Ulva prolifera biochar adsorbing Direct Scarlet’s Gibbs is less than 0, adsorption is spontaneous, and it is an endothermic reaction, biased in favor of the chemical reaction, and it is a process of increasing entropy.(5) Temperature and ionic strength have certain impact to Ulva prolifera biochar’s adsorption.(6) Ionic strength factor has significant effect to the Ulva prolifera biochar adsobing to the Direct Scarlet.(7) Established a method of Ulva prolifera biochar and Nano-modified iron made to NZVI successfully, and the NZVI/C prepared rich irregular crystals, and loaded nano-iron.(8) NZVI/C pollutant removal performance is 2.5 times to the original Ulva prolifera biochar.(9) The addition amount of NZVI/C, pollutant concentration, temperature and ionic strength are all important impact to NZVI/C pollutant removal performance. And it is a positive correlation.