摘要
以玉米秸秆为原材料制备了生物质基炭,经共沉淀法成功制备了磁性生物质碳(Fe_(3)O_(4)@C)用于吸附水中的汞离子。采用控制变量法探究了4个单因素(溶液pH、温度、吸附剂投入量、吸附时间)对磁性生物质炭吸附Hg^(2+)效率的影响,发现pH值和投入量的影响程度较大,吸附时间次之,温度影响较小。借助上述实验结果,使用Design Expert软件,通过Box-Behnken设计汞吸附实验,成功构建了汞吸附效率与上述影响因素之间的回归模型;借助响应曲面法分析,精确确定了最佳的工艺条件。经平行实验验证,磁性生物质炭对水中Hg^(2+)的吸附效率可达到98.91%,经过吸附处理后的含汞废水达到可排放标准。
The magnetic biomass carbon(Fe_(3)O_(4)@C)was prepared by co-precipitation method and used to adsorb mercury ions in water with using maize straw as raw materials to prepare for biomass-based carbon.The effects of 4 single factors(pH,temperature,amount of adsorbent and adsorption time)on the adsorption efficiency of Hg^(2+)on magnetic biomass carbon(MBC)were investigated by the control variable method,and it was found that the pH value and the amount of input had a greater effect,the adsorption time was the second,and the temperature had a smaller effect.Based on the above experimental results,the mercury adsorption experiment was designed by Box-Behnken using Design Expert software,and the regression model between the mercury adsorption efficiency and the above-mentioned influencing factors was successfully constructed.The optimum process conditions were determined accurately by the analysis of response surface method.The parallel experiments verify that the adsorption efficiency of Hg^(2+)by magnetic biomass carbon was 98.91%,and the Hg^(2+)containing wastewater could meet the discharge standard.
作者
马宵颖
许洁
刘先炉
马双忱
MA Xiaoying;XU Jie;LIU Xianlu;MA Shuangchen(Department of Environmental Science and Engineering,North China Electric Power University,Baoding 071003,China)
出处
《电力科学与工程》
2024年第3期44-51,共8页
Electric Power Science and Engineering
基金
河北省自然科学基金资助项目(B2019502059)。
关键词
汞污染
吸附法
磁性生物质炭
响应曲面
mercury pollution
adsorption method
magnetic biomass
response surface
