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Solid waste sub-driven acidic mesoporous activated carbon structures for efficient uranium capture through the treatment of industrial phosphoric acid
Environmental Technology & Innovation ( IF 7.1 ) Pub Date : 2021-01-11 , DOI: 10.1016/j.eti.2021.101363
Asmaa S. Morshedy , Mohamed H. Taha , Dina M. Abd El-Aty , Ahmed Bakry , Ahmed M.A. El Naggar

This research study presents bio-char manufacturing from a solid waste (rice-straw) by low-temperature pyrolysis as a new trend. The as-produced char (named as BC) and its sub-driven hydrochloric and nitric acids activated carbons (labeled as HAC, and NAC respectively) were employed as adsorbents for uranium removal from a commercial grade of phosphoric acid. Morphological and structural characteristics of the presented carbonaceous structures were accomplished utilizing Fourier Transform Infrared (FTIR) Spectroscopy and Transmission Electron Microscopy (TEM). The uranium adsorption process via these three structures was then performed via the batch technique at various operating conditions. It was observed that the labeled structure as HAC has an increased adsorption capacity, compared to the other two adsorbents. Thus, it could attain a higher level of uranium species removal than both NAC and BC. Hence, HAC could be subsequently concluded as the structure of most suitability, among the three adsorbents, for uranium taking out from industrial phosphoric acid. The collected adsorption results by the three structures had been next examined by diverse kinetic and isotherm models. By all structures in this study, the presented adsorption processes were found to follow the pseudo-second-order model and perfectly match the Langmuir isotherm model. The applied three sorbents’ sorption capacity was 2.3, 2.5, and 3.3 for BC, NAC, and HAC, respectively. This confirms that the bio-char activation with hydrochloric acid has the most positive impact on bio-char’s sorption characteristics The various thermodynamics factors (ΔH, ΔG and ΔS) could reveal that these processes are exothermic exploits.



中文翻译:

固体废物亚驱动的酸性介孔活性炭结构,可通过处理工业磷酸来有效捕集铀

这项研究提出了通过低温热解从固体废物(稻草)生产生物炭的新趋势。所生产的炭(称为BC)及其副驱动的盐酸和硝酸活性炭(分别标记为HAC和NAC)被用作吸附剂,用于从工业级磷酸中去除铀。呈现的碳质结构的形态和结构特征是利用傅立叶变换红外(FTIR)光谱和透射电子显微镜(TEM)实现的。然后通过分批技术在不同的操作条件下通过这三个结构进行铀吸附过程。观察到,与其他两种吸附剂相比,标记为HAC的结构具有增强的吸附能力。从而,它可以实现比NAC和BC更高的铀物种去除水平。因此,可以得出结论,HAC是三种吸附剂中最适合从工业磷酸中提取铀的结构。接下来,通过各种动力学和等温线模型检查了这三种结构收集的吸附结果。通过这项研究中的所有结构,发现所提出的吸附过程遵循伪二级模型并与Langmuir等温模型完全匹配。三种吸附剂对BC,NAC和HAC的吸附容量分别为2.3、2.5和3.3。这证实了用盐酸活化生物炭对生物炭的吸附特性具有最积极的影响。各种热力学因素(因此,可以得出结论,HAC是三种吸附剂中最适合从工业磷酸中提取铀的结构。接下来,通过各种动力学和等温线模型检查了这三种结构收集的吸附结果。通过这项研究中的所有结构,发现所提出的吸附过程遵循伪二级模型并与Langmuir等温模型完全匹配。三种吸附剂对BC,NAC和HAC的吸附容量分别为2.3、2.5和3.3。这证实了用盐酸活化生物炭对生物炭的吸附特性具有最积极的影响。各种热力学因素(因此,可以得出结论,HAC是三种吸附剂中最适合从工业磷酸中提取铀的结构。接下来,通过各种动力学和等温线模型检查了这三种结构收集的吸附结果。通过这项研究中的所有结构,发现所提出的吸附过程遵循伪二级模型并与Langmuir等温模型完全匹配。三种吸附剂对BC,NAC和HAC的吸附容量分别为2.3、2.5和3.3。这证实了用盐酸活化生物炭对生物炭的吸附特性具有最积极的影响。各种热力学因素(用于从工业磷酸中提取铀。接下来,通过各种动力学和等温线模型检查了这三种结构收集的吸附结果。通过这项研究中的所有结构,发现所提出的吸附过程遵循伪二级模型并与Langmuir等温模型完全匹配。三种吸附剂对BC,NAC和HAC的吸附容量分别为2.3、2.5和3.3。这证实了用盐酸活化生物炭对生物炭的吸附特性具有最积极的影响。各种热力学因素(用于从工业磷酸中提取铀。接下来,通过各种动力学和等温线模型检查了这三种结构收集的吸附结果。通过这项研究中的所有结构,发现所提出的吸附过程遵循伪二级模型并与Langmuir等温模型完全匹配。三种吸附剂对BC,NAC和HAC的吸附容量分别为2.3、2.5和3.3。这证实了用盐酸活化生物炭对生物炭的吸附特性具有最积极的影响。各种热力学因素(发现所提出的吸附过程遵循伪二级模型,并且与朗缪尔等温线模型完全匹配。三种吸附剂对BC,NAC和HAC的吸附容量分别为2.3、2.5和3.3。这证实了用盐酸活化生物炭对生物炭的吸附特性具有最积极的影响。各种热力学因素(发现所提出的吸附过程遵循伪二级模型,并且与朗缪尔等温线模型完全匹配。三种吸附剂对BC,NAC和HAC的吸附容量分别为2.3、2.5和3.3。这证实了用盐酸活化生物炭对生物炭的吸附特性具有最积极的影响。各种热力学因素(Δ^ hΔGΔS)可能表明这些过程是放热漏洞。

更新日期:2021-01-25
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