秸秆生物炭对尼泊金乙酯的吸附特性研究 postprint

Abstract: To promote the utilization of straw in resources, sugarcane residue，eggplant straw，corn straw was used as raw material to prepare the biochar adsorbent at 500 ℃，which were named SBC、EBC and CBC. Biochar is a carbon-rich product of biomass produced by thermal decomposition under limited oxygen supply at a relatively low temperature. Ethyl paraben was subject to batch adsorption in aqueous medium by the prepared biochar. The results of adsorption experiments showed that the kind of raw materials significantly affects its adsorption effect on ethyl paraben. The adsorption capacity of ethyl paraben from three kinds of biochar was SBC>EBC>CBC. In addition，the initial concentration of ethyl paraben in waste water, the temperature and time of adsorption can also affect the adsorption effect. The removal rates of ethyl paraben by three biochar decreased with increasing initial concentration of ethyl paraben. High temperature is beneficial to adsorption. When the initial concentration of ethyl paraben was 30 mgL·-1 and the adsorption temperature was 25 ℃，the removal rate of ethyl paraben was up to 99.7% after SBC adsorption. The reaction increased rapidly at the beginning of 120 min and reached the adsorption equilibrium after 270 min. The isothermal adsorption line for ethyl paraben conforms to the Langmuir mode and the Freundlich mode. The results provided a theoretical basis for the removal of organic pollutants such as ethyl paraben.