【摘要】 制备了KOH改性低温生物质炭（low temperature biochar modified by potassium hydroxide,BC-P）、KOH改性高温生物质炭（high temperature biochar modified by potassium hydroxide,HC-P）、NaHS改性低温生物质炭（low temperature biochar modified by sodium hydrosulfide,BC-S）、NaHS改性高温生物质炭（high temperature biochar modified by sodium hydrosulfide,HC-S）,并研究了溶液pH、吸附剂投加量、吸附温度和Hg²⁺浓度等因素对上述4种改性生物质炭吸附水溶液中Hg²⁺的影响.结果表明,BC-S对Hg²⁺吸附效果最好,在pH为4、温度为298 K、投加量为1.2 g/L时,对10.0 mg/L的Hg²⁺溶液中Hg²⁺吸附量为8.48 mg/g,去除率达到97.89%.准二级动力学能很好地描述BC-S对Hg²⁺的吸附动力学过程,其等温吸附过程符合Langmuir吸附等温线,吸附热力学表明298 K最有利于BC-S吸附Hg²⁺.更多还原

【Abstract】 The low temperature biomass carbon modified by KOH（ BC-P）,high temperature biomass carbon modified by KOH（ HC-P）,low temperature biomass carbon modified by NaHS（ BC-S） and high temperature biomass carbon modified by NaHS（ HC-S） are prepared respectively. The influence of solution pH,adsorbents dosage,temperature and initial concentration of Hg²⁺on the adsorption of Hg²⁺of the four modified adsorbents are discussed. The results show that the adsorption capacity of BC-S is better than the other adsorbents. The maximum adsorption amounts is 8.48 mg/g and the removal percentage is 97.89% at the condition of pH 4,dosage 1.2 g/L and temperature 298 K. The pseudo-second-order model can describe the adsorption kinetic of BC-S on Hg²⁺well and the adsorption behavior follows Langmuir model.Adsorption thermodynamics show that 298 K is the most favorable temperature to adsorb Hg²⁺.更多还原