摘要
煤气化细渣是一种产量大且含碳量高的固体废弃物,用煤气化细渣中残炭制备的多孔吸附剂处理废水中的苯酚可达到以废治废的目的。通过氨水浸渍和微波辐照相结合的手段对精选炭进行改性以增强其对苯酚的吸附能力,采用Box-Behnken响应曲面法设计改性实验,选定浸渍时间、氨水质量分数和用量、精选炭投放量、微波辐照时间及功率等作为设计变量,以苯酚去除率为响应值,通过方差分析和响应面分析,研究了模型的可靠性及各变量之间的交互影响关系。结果表明:经过响应面模型预测及验证后得到了氨水浸渍和微波辐照改性的最佳工艺条件为氨水质量分数25%、浸渍时间660 min、氨水用量153 mL、微波辐照时间6 min、辐照功率550 W、氨水浸渍的精选炭投放量2.9 g,在此条件下得到的改性精选炭苯酚去除率达92.31%,实验值与预测值基本一致;对改性精选炭进行分析表征及吸附评价发现,改性后的精选炭酸性官能团(羧基、内酯基、羟基)含量和平均孔径分别下降了84%和47%,碱性官能团、总孔体积和比表面积分别提高了86%,43%和108%。
Coal gasification fine slag is a significant type of solidwaste with large output and high carbon content.The purpose of treating wastewater with solidwaste can be achieved by adsorbing phenol in wastewater with porous adsorbent prepared from residual carbon in coal gasification fine slag.The concentrate carbon is modified by ammonia and microwave irradiation in order to boost its adsorption capacity of phenol in this paper.Box-Behnken response surface methodology is used to design the modification experiment,with impregnation time,ammonia mass fraction and dosage,concentrate carbon dosage,microwave irradiation time and power as design variables,and phenol removal ratio as the response value.The reliability of the model and the interaction between the variables are studied through variance analysis and response surface analysis.After response surface modeling prediction and verification,the optimal process conditions for ammonia impregnation and microwave irradiation modification are obtained,namely ammonia mass fraction of 25%,impregnation time of 660 min,ammonia dosage of 153 mL,microwave irradiation time of 6 min,microwave power of 550 W,and concentrate carbon dosage of 2.9 g.In these conditions,the phenol removal ratio of the modified concentrate carbon reaches 92.31%,and the experimental value is basically consistent with the predicted value.Analysis and adsorption evaluation of modified concentrate carbon show that the content of acidic functional groups(carboxyl,lactone,hydroxyl),and average pore size of the modified concentrate carbon decrease by 84%and 47%,respectively,but the alkaline functional groups,total pore volume and specific surface area increase by 86%,43%,and 108%,respectively.
作者
雷云裕
刘哲语
LEI Yunyu;LIU Zheyu(Department of Food and Biochemical Engineering,Yantai Vocational College,264670 Yantai,China;State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,030001 Taiyuan,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2024年第6期67-76,共10页
Coal Conversion
基金
国家重点研发计划项目(2022YFB4101604).
关键词
气化细渣
精选炭
氨水
苯酚
改性
gasification fine slag
concentrate carbon
ammonia
phenol
modification
