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首页> 外文期刊>Water, Air, and Soil Pollution >Removal of Selected Heavy Metal Ions from Industrial Wastewater Using Rice and Corn Husk Biochar
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Removal of Selected Heavy Metal Ions from Industrial Wastewater Using Rice and Corn Husk Biochar

机译：使用米饭和玉米壳生物炭从工业废水中除去选定的重金属离子

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This study investigated the removal of heavy metal ions from industrial wastewater by using rice and corn husk biochar. The choice of the materials was influenced by their large surface area, abundance of functional groups as well as their availability in the local environment. Rice and corn husks were pyrolyzed at 500, 600, and 700 degrees C to make biochars that were used to treat low-quality industrial wastewater. Initial metal ion levels in wastewater and residual levels after the application of biochars were measured using an atomic adsorption spectrophotometer. Carbonization of rice husks at 600 degrees C produced the best removal efficiencies for Cr (65%), Fe (90%), and Pb ( 90%). The carbonization of corn husks at 600 degrees C produced the worst removal efficiencies for Cr (only 20%) and Pb (slightly 35%). Regardless of the carbonization temperature, rice husk biochars performed better than corn husk biochars. Experimental data fitted well the Langmuir and Freundlich isotherm models (R-2 values ranging between 0.82 and 0.99). The Langmuir separation factor, R-L, had negative values, probably due to the low initial concentration of the adsorbates in the raw wastewater. All the biochars showed a relatively short contact time (20 to 30 min) to attain maximum adsorption efficiencies and are a promising feature for future industrial applications. The studied biochar materials from rice and corn husk have the potential to remove heavy metal ions from industrial wastewater; rice husk biochar showed higher removal capacity than corn husk biochars.
机译：本研究研究了通过使用水稻和玉米壳生物炭从工业废水中除去重金属离子。材料的选择受到其大表面积的影响，官能团的丰度以及当地环境中的可用性。大米和玉米壳在500,600和700℃下热解，以制造用于治疗低质量的工业废水的生物脉。使用原子吸附分光光度计测量生物肢施用后废水和残留水平的初始金属离子水平。 600摄氏度的米壳碳化产生了Cr（65％），Fe（90％）和Pb（> 90％）的最佳去除效率。 600℃的玉米壳的碳化产生了Cr（仅20％）和Pb的最差清除效率（略微> 35％）。无论碳化温度如何，稻壳生物谱都比玉米稻壳生物脉冲更好。实验数据井井，兰德里尔和Freundlich等温线（R-2值在0.82和0.99之间）。 Langmuir分离因子R-L具有负值，可能是由于原料废水中吸附物的初始浓度低。所有Biochars都显示出相对短的接触时间（20至30分钟），以获得最大的吸附效率，并且是未来的工业应用的有希望的特征。来自水稻和玉米壳的研究生物炭材料有可能从工业废水中除去重金属离子;稻壳Biochar比玉米稻壳Biochars更高的去除能力。

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