National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221008, China.
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221008, China.
Molecules. 2022 Jun 27;27(13):4121. doi: 10.3390/molecules27134121.
In this study, the adsorption method and micro-nano bubble (MNB) technology were combined to improve the efficiency of organic pollutant removal from dye wastewater. The adsorption properties of Congo red (CR) on raw coal and semi-coke (SC) with and without MNBs were studied. The mesoporosity of the coal strongly increased after the heat treatment, which was conducive to the adsorption of macromolecular organics, such as CR, and the specific surface area increased greatly from 2.787 m/g to 80.512 m/g. MNBs could improve the adsorption of both raw coal and SC under different pH levels, temperatures and dosages. With the use of MNBs, the adsorption capacity of SC reached 169.49 mg/g, which was much larger than that of the raw coal at 15.75 mg/g. The MNBs effectively reduced the adsorption time from 240 to 20 min. In addition, the MNBs could ensure the adsorbent maintained a good adsorption effect across a wide pH range. The removal rate was above 90% in an acidic environment and above 70% in an alkaline environment. MBs can effectively improve the rate of adsorption of pollutants by adsorbents. SC was obtained from low-rank coal through a rapid one-step heating treatment and was used as a kind of cheap adsorbent. The method is thus simple and easy to implement in the industrial context and has the potential for industrial promotion.
在这项研究中，结合吸附法和微纳米气泡（MNB）技术，提高了从染料废水中去除有机污染物的效率。研究了原始煤和半焦（SC）在有无 MNB 条件下对刚果红（CR）的吸附性能。热处理后，煤的中孔强烈增加，有利于大分子有机物（如 CR）的吸附，比表面积从 2.787 m/g 大幅增加到 80.512 m/g。MNB 可在不同 pH 值、温度和剂量下提高原煤和 SC 的吸附性能。使用 MNB 后，SC 的吸附容量达到 169.49 mg/g，远大于原煤的 15.75 mg/g。MNB 有效地将吸附时间从 240 分钟缩短到 20 分钟。此外，MNB 可以确保吸附剂在较宽的 pH 范围内保持良好的吸附效果。在酸性环境中去除率高于 90%，在碱性环境中去除率高于 70%。MNB 可以有效地提高吸附剂对污染物的吸附速率。SC 是通过快速一步加热处理从低阶煤中获得的，可用作一种廉价的吸附剂。因此，该方法简单易行，在工业上具有推广潜力。
