[1]郑章宏,袁宇兴,汤裕,等.磷酸钙玻璃作为土壤和尾矿中重金属离子的固化剂[J].中国材料进展,2018,(06):061-66.[doi:10.7502/j.issn.1674-3962.2018.06.08]
 ZHENG Zhanghong,YUAN Yuxing,TANG Yu,et al.Calcium Phosphate Glass as Curing Agent for Heavy Metal Ions in Soil and Tailings[J].MATERIALS CHINA,2018,(06):061-66.[doi:10.7502/j.issn.1674-3962.2018.06.08]
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磷酸钙玻璃作为土壤和尾矿中重金属离子的固化剂()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2018年第06期
页码:
061-66
栏目:
前沿综述
出版日期:
2018-06-30

文章信息/Info

Title:
Calcium Phosphate Glass as Curing Agent for Heavy Metal Ions in Soil and Tailings
作者:
郑章宏袁宇兴汤裕卢安贤
中南大学材料科学与工程学院,湖南 长沙 410083
Author(s):
ZHENG Zhanghong YUAN Yuxing TANG Yu LU Anxian
School of Materials Science and Engineering, Central South University, Changsha 410083, China
关键词:
磷酸钙玻璃重金属离子pH值CaO/P2O5比固化率
Keywords:
Calcium phosphate glass heavy metal ions pH value CaO/P2O5 ratio immobilization rate
DOI:
10.7502/j.issn.1674-3962.2018.06.08
文献标志码:
A
摘要:
利用传统熔体冷却法制备了磷酸钙玻璃(CPG),研究了该玻璃对土壤和铅锌矿尾矿中Pb和Cd离子的固化行为。结果表明,四种不同组分的CPG对降低Pb和Cd离子浓度都有较好效果,与Cd离子相比,Pb离子浓度降低辐度更大;CPG中的CaO/P2O5摩尔比及CPG在溶液中的溶解度直接影响其对重金属离子的固化效果。当CaO/P2O5比例为4∶6时,CPG对被污染土壤和铅锌矿尾矿中的Pb和Cd离子固化率达到最高。由于对Pb离子的固化属溶解沉淀机制,而对Cd离子的固化则为表面吸附与络合作用,因此,Pb离子的固化比Cd离子的固化对pH值更敏感。研究发现,用CPG溶液固化被污染土壤和铅锌矿尾矿时Pb, Cd离子的最佳pH值分别为4和5,其最大固化率分别为7012%与6905%和5822%与5274%。
Abstract:
Calcium phosphate glasses (CPGs) have been prepared by the conventional melting quenching method. The immobilizing behavior and effects of CPG solution to Pb and Cd ions in contaminated soils and lead zinc mine tailings have been studied. The results showed that four CPG solutions with different CaO/P2O5 ratio have excellent effects on reducing the concentration of Pb and Cd ions. Compared with the immobilizing Cd ions, the CPG solutions have better effects when it was used to immobilize Pb ions in both contaminated soils and lead zinc mine tailings. The immobilizing effect on heavy metal ions depends directly on the CaO/P2O5 ratio and solubility of CPG solution. When the CaO/P2O5 ratio of CPG is 4∶6, the highest immobilization rate of Pb and Cd ions in the solution was observed. PH value has more obvious effects on the immobilization of Pb ions than that of Cd ions. The possible reason is the former belongs to the mechanism of precipitation and dissolution, but the later is attributed to the surface absorption and complexation mechanism. The optimum pH value for immobilizing Pb and Cd ions from contaminated soil and lead zinc mine tailings with CPG solution is 4 and 5, respectively. The maximum immobilization rate on Pb and Cd ions is 7012% ,6905% and 5822% and 5274%, respectively.
更新日期/Last Update: 2018-07-06