Discussion on the applicability and mechanism of phosphate-based geopolymers used for cadmium and cadmium-lead heavy metals solidification/stabilization
文献类型：期刊论文
| 作者 | Pu, Shaoyun1,2,3,4; Shen, Zewei1; Duan, Wei5; Lang, Lei6; Liu, Yang7; Xu, Bomin1; Yao, Huiran1; Mei, Guoxiong4 |
| 刊名 | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
 |
| 出版日期 | 2024-10-01 |
| 卷号 | 12期号:5页码:13 |
| 关键词 | Phosphate-based geopolymer Solidification/stabilization Heavy metal Toxic leaching Mechanism |
| ISSN号 | 2213-2929 |
| DOI | 10.1016/j.jece.2024.113846 |
| 英文摘要 | Lead (Pb2+) and cadmium (Cd2+) are common heavy metal pollution, which is harmful to humans and animals. However, the diffusion rate of heavy metal ions moves faster in acidic environment, there are a large number of acidic heavy metal polluted soil in China, but the conventional binders are not effective to deal with them. Phosphate-based geopolymers (PGEOs) are acidic materials, and have excellence mechanical properties in acidic environment and solidification/stabilization (S/S) effect on Pb2+, but the applicability of PGEOs to Cd, Pb and Cd composite pollution is not clear. Therefore, this study discusses the applicability of PGEOs fabricated from fly ash (FA) and aluminum dihydrogen phosphate (ADP) as activator for S/S treatment of Cd, Pb-Cd composite pollution. Results show that the influence of Cd2+ and Pb2+ on the compressive strength of PGEOs was inconsistent, as the Cd2+ content raised, the compressive strength reduced slightly at 7 and 14 days, but it did not change basically at 28 days. However, the compressive strength rose firstly and then declined with an increase in Pb-Cd content when partial Pb2+ was used to replace Cd2+. The compressive strength of PGEOs with a Pb-Cd content of 0.6 % reached maximum (11.45 MPa), exceeding the compressive strength of PGEOs containing Cd2+. Moreover, the PGEOs presents an excellent stabilization effect on Pb2+, but poor effect on Cd2+. The Pb2+ leaching concentration meet the hazardous solid waste identification criteria (<5 mg/L), but the Cd2+ leaching is high and is more than 1 mg/L. Furthermore, the compressive strength of PGEOs had a good correlation with pH and EC. The S/S mechanism of PGEOs for Pb2+, Cd2+ includes physical adsorption, encapsulation, and chemical precipitation. However, Pb2+ involved in the geopolymerization process, while Cd2+ can not participate in the structure formation, so the PGEOs have a poor S/S effect. Therefore, it needs to be further improved when using PGEOs to stabilize acidic Cd2+ contaminated soil. |
| 资助项目 | Natural Science Foundation of Zhejiang Province of China[LQ23E080005] ; Natural Science Foundation of China[42307219] ; Natural Science Foundation of China[52108332] ; Natural Science Foundation of China[42472349] ; Guizhou Provincial Science and Technology Support Plan Project[[2023] 136] ; China Postdoctoral Science Foundation[2024M752869] ; Shanxi Scholarship Council of China[2023-042] ; Central Government Guides Local Science and Technology Development Fund Projects of China[YDZJSX20231A022] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001306653900001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/42443]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Mei, Guoxiong |
| 作者单位 | 1.Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Zhejiang, Peoples R China 2.Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Zhejiang, Peoples R China 3.Guizhou Huayoutong Engn Technol Co Ltd, Guiyang 550025, Guizhou, Peoples R China 4.Zhejiang Univ, Ocean Coll, Zhoushan, Zhejiang, Peoples R China 5.Taiyuan Univ Technol, Coll Civil Engn, Taiyuan 030024, Shanxi, Peoples R China 6.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 7.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong 999077, Peoples R China |
| 推荐引用方式 GB/T 7714 | Pu, Shaoyun,Shen, Zewei,Duan, Wei,et al. Discussion on the applicability and mechanism of phosphate-based geopolymers used for cadmium and cadmium-lead heavy metals solidification/stabilization[J]. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING,2024,12(5):13. |
| APA | Pu, Shaoyun.,Shen, Zewei.,Duan, Wei.,Lang, Lei.,Liu, Yang.,...&Mei, Guoxiong.(2024).Discussion on the applicability and mechanism of phosphate-based geopolymers used for cadmium and cadmium-lead heavy metals solidification/stabilization.JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING,12(5),13. |
| MLA | Pu, Shaoyun,et al."Discussion on the applicability and mechanism of phosphate-based geopolymers used for cadmium and cadmium-lead heavy metals solidification/stabilization".JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 12.5(2024):13. |
入库方式： OAI收割
来源：武汉岩土力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。