ژئوپلیمر مبتنی بر خاکستر منگنز
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ژئوپلیمر مبتنی بر خاکستر منگنز

عنوان فارسی مقاله: سنتز و تعیین خصوصیات ژئوپلیمر مبتنی بر خاکستر منگنز برای عدم تحرک مونوکسید کربن
عنوان انگلیسی مقاله: Synthesis and characterization of Mn-slag based geopolymer for immobilization of Co
مجله/کنفرانس: مجله تولید پاک – Journal of Cleaner Production
رشته های تحصیلی مرتبط: مهندسی محیط زیست، شیمی
گرایش های تحصیلی مرتبط: آلودگی های محیط زیست، شیمی محیط زیست
کلمات کلیدی فارسی: ژئوپلیمر، خاکستر منگنز، پسماند رادیواکتیو، مونوکسید کربن
کلمات کلیدی انگلیسی: Geopolymer، Mn slag، Radioactive waste، Co
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus – Master Journals List – JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.jclepro.2019.06.149
دانشگاه: Hubei Key Laboratory of Critical Zone Evolution, School of Earth Science, China University of Geosciences, Wuhan, 430074, China
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 7.096 در سال 2018
شاخص H_index: 150 در سال 2019
شاخص SJR: 1.620 در سال 2018
شناسه ISSN: 0959-6526
شاخص Quartile (چارک): Q1 در سال 2018
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 8
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: خیر
آیا این مقاله مدل مفهومی دارد: ندارد
آیا این مقاله پرسشنامه دارد: ندارد
آیا این مقاله متغیر دارد: ندارد
کد محصول: E12773
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


Graphical abstract


1. Introduction


2. Materials and methods


3. Results and discussion


4. Conclusion


Acknowledgments


Appendix A. Supplementary data


References

نمونه متن انگلیسی مقاله

Abstract


Growth of the nuclear industry has encouraged us to look for techniques to treat large volumes of nuclear waste. 60Co is one of the most problematic radioactive wastes in the nuclear industry. In this study, a Mn slag-based geopolymer (MSG) was prepared, which exhibited better Co immobilization performance than the ordinary metakaolin-based geopolymer (MKG). Varying the mass ratio between water glass and NaOH (mw/mn) influenced the structure and chemical performance of the MSG samples, which consequently influenced their Co immobilization capacity. The optimized MSG was obtained at an mw/mn value of 1.5. After the 7-day leaching test, about 0.20% of the Co was released from MSG, which is less than two-thirds of the MKG sample. The chemical state of Co in the geopolymer matrix was characterized by X-ray photoelectron spectroscopy. Divalent Co remained in the MKG samples, while most of Co ions in MSG samples existed in the trivalent state. These results strongly suggest that divalent Co was oxidized to trivalent Co in the MSG matrix, resulting in enhanced Co solidification capacity compared to MKG. The results in this study indicate that the oxidation environment in the MSG played an important role in Co immobilization.


Introduction


Although nuclear energy exhibits many advantages over traditional energy types with regard to the increasing global energy crisis, treating large volumes of nuclear waste has become a critical factor for sustainable development of the industry. 60Co is formed by activation of the Co present as an impurity in the metals used in nuclear reactors. It is one of the most problematic radioactive wastes considering solubility, high yield, and long half-life. The best approach to retard mobilization of this radionuclide is to encapsulate it into highly stable low chemically reactive material. Cement-based materials are among the most widely used for encapsulating radioactive wastes. However, the thermal stability and acid corrosion resistance of cement-based materials are relatively low (Malviya and Chaudhary, 2006; Paria and Yuet, 2006; Zhou et al., 2006). Moreover, utilization of other materials, such as glass and resin, is limited by their high cost as well as complex preparation (Li and Wang, 2006). A geopolymer is a three-dimensional amorphous aluminosilicate inorganic polymer produced by reacting amorphous aluminosilicate with a highly alkaline activating solution. Dissolution and reorganization of the amorphous aluminosilicate occurs during activation. The SiO4 4 and AlO4  tetrahedron is randomly interlinked by shared O atoms and forms a rigid three-dimensional network. Because of its excellent mechanical performance, such as compressive strength, acid/alkaline resistance, and heat resistance, geopolymers have become ideal materials for solidifying toxic waste (Al-Zboon et al., 2011; Cheng et al., 2012; Ok et al., 2007).

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