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181609-甘蔗渣水热炭对电镀废水中六价铬的吸附特性

   日期:2018-09-20     浏览:46    评论:0    
核心提示:中文核心期刊,中国科技核心期刊! DOI: 10.19289/j.1004-227x.2018.16.009甘蔗渣水热炭对电镀废水中六价铬的吸附特性刘雪梅*,
 

中文核心期刊,中国科技核心期刊!


DOI: 10.19289/j.1004-227x.2018.16.009

甘蔗渣水热炭对电镀废水中六价铬的吸附特性

刘雪梅*,马闯,吴凡,赵蓓(华东交通大学土木建筑学院,江西 南昌 330013)

摘要:采用扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)及BET 方法对在硫酸中水热炭化前后的甘蔗渣进行了表征。结果显示,炭化后的甘蔗渣为骨状结构,表面有大量整齐排列的孔隙,比表面积大大增加,且化学结构与炭化前相比发生了改变。采用14 g/L甘蔗渣水热炭处理含50 mg/L Cr(VI)的模拟废水时,在温度35 °C 和pH = 2 的条件下反应90 min,Cr(VI)的去除率为99.8%,最大Cr(VI)吸附量为3.871 mg/g。Langmuir 等温吸附模型和拟二级动力学方程能很好地反映吸附过程。采用该甘蔗渣水热炭,只要12 g/L 就能令含总铬25.09 mg/L、Cr(VI)20.07 mg/L、Zn2+ 1.88 mg/L、Ni2+ 1.14 mg/L 和Cu2+ 1.68 mg/L 的实际电镀废水达到GB 21900–2008《电镀污染物排放标准》的“表3”要求。

关键词:甘蔗渣;水热炭化;电镀废水;六价铬;吸附;等温线;动力学

中图分类号:O647.33; X781.1

文献标志码:A 

文章编号:1004 – 227X (2018) 16 – 0738 – 07

Adsorption of hexavalent chromium in electroplating wastewater on bagasse-based hydrothermally

synthesized carbon // LIU Xue-mei*, MA Chuang, WU Fan, ZHAO Bei

Abstract: The bagasse before and after hydrothermal carbonization in sulfuric acid was characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy, and BET (Brunauer–Emmett–Teller) method. It is shown that the carbonized bagasse has a bone-like structure with a large number of pores arranged neatly on its surface. The specific surface area of bagasse is greatly increased, and its chemical structure is changed after carbonization. 99.8% of Cr(VI) was removed from a simulated wastewater containing 50 mg/L Cr(VI) after treatment with 14 g/L hydrothermally carbonized bagasse at 35 °C and pH 2 for 90 min. The maximum adsorption amount of Cr(VI) on the hydrothermally carbonized bagasse is 3.871 mg/g. The adsorption data fits the Langmuir adsorption isotherm and the pseudo-second-order kinetic equation. The actual electroplating wastewater containing total Cr 25.09 mg/L, Cr(VI) 20.07 mg/L, Zn2+ 1.88 mg/L, Ni2+ 1.14 mg/L, and Cu2+ 1.68 mg/L met the requirement of the Table 3 of GB 21900–2008 Emission Standard of Pollutants for Electroplating after being treated with 12 g/L hydrothermally carbonized bagasse.

Keywords: bagasse; hydrothermal carbonization; electroplating wastewater; hexavalent chromium; adsorption; isotherm; kinetics

First-author’s address: School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013,China

PDF全文下载,请点击     1816009_0738-0744_185890.pdf


 
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