Elkady Marwa, Shokry Hassan, Hamad Hesham
Fabrication Technology Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City 21934, Egypt.
Chemical and Petrochemical Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City 21934, Egypt.
Materials (Basel). 2020 May 30;13(11):2498. doi: 10.3390/ma13112498.
Nano-activated carbon (NAC) prepared from El-Maghara mine coal were modified with nitric acid solution. Their physico-chemical properties were investigated in terms of methylene blue (MB) adsorption, FTIR, and metal adsorption. Upon oxidation of the AC with nitric acid, surface oxide groups were observed in the FTIR spectra by absorption peaks at 1750-1250 cm. The optimum processes parameters include HNO/AC ratio (wt./wt.) of 20, oxidation time of 2 h, and the concentration of HNO of 10% reaching the maximum adsorption capacity of MB dye. Also, the prepared NAC was characterized by SEM, EDX, TEM, Raman Spectroscopy, and BET analyses. The batch adsorption of MB dye from solution was used for monitoring the behavior of the most proper produced NAC. Equilibrium isotherms of MB dye adsorption on NAC materials were acquired and the results discussed in relation to their surface chemistry. Langmuir model recorded the best interpretation of the dye adsorption data. Also, NAC was evaluated for simultaneous adsorption of six different metal ions (Fe, Ni, Mn, Pb, Cu, and Zn) that represented contaminates in petrochemical industrial wastewater. The results indicated that the extracted NAC from El-Maghara mine coal is considered as an efficient low-cost adsorbent material for remediation in both basic dyes and metal ions from the polluted solutions.
由马加拉矿煤制备的纳米活性炭（NAC）用硝酸溶液进行了改性。通过亚甲基蓝（MB）吸附、傅里叶变换红外光谱（FTIR）和金属吸附对其物理化学性质进行了研究。在用硝酸氧化活性炭后，在FTIR光谱中1750 - 1250 cm处的吸收峰观察到表面氧化物基团。最佳工艺参数包括硝酸与活性炭的重量比（wt./wt.）为20、氧化时间为2小时以及硝酸浓度为10%，此时MB染料的吸附容量达到最大。此外，制备的NAC通过扫描电子显微镜（SEM）、能量散射X射线光谱（EDX）、透射电子显微镜（TEM）、拉曼光谱和比表面积分析仪（BET）分析进行了表征。采用从溶液中批量吸附MB染料来监测最适宜制备的NAC的性能。获得了MB染料在NAC材料上吸附的平衡等温线，并根据其表面化学对结果进行了讨论。朗缪尔模型对染料吸附数据的解释最佳。此外，还评估了NAC对六种不同金属离子（铁、镍、锰、铅、铜和锌）的同时吸附情况，这些金属离子代表石化工业废水中的污染物。结果表明，从马加拉矿煤中提取的NAC被认为是一种高效低成本的吸附材料，可用于从污染溶液中去除碱性染料和金属离子。
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