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...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Hg^(2+)浓度等因素对上述4种改性生物质炭吸附水溶液中Hg^(2+)的影响.结果表明,BC-S对Hg^(2+)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Hg^(2+)溶液中Hg^(2+)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Hg^(2+)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Hg^(2+).展开更多
文摘制备了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Hg^(2+)浓度等因素对上述4种改性生物质炭吸附水溶液中Hg^(2+)的影响.结果表明,BC-S对Hg^(2+)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Hg^(2+)溶液中Hg^(2+)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Hg^(2+)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Hg^(2+).
