Towards Safe Diatomite Sludge Management: Lead Immobilisation via Geopolymerisation
文献类型：期刊论文
| 作者 | Guo, Haozhe3,4,5; Huang, Zhihao2; Zhang, Baifa1; Yu, Ting1; Pantongsuk, Thammaros2; Yuan, Peng1 |
| 刊名 | MINERALS
 |
| 出版日期 | 2024-08-01 |
| 卷号 | 14期号:8页码:15 |
| 关键词 | diatomite geopolymers lead immobilisation heavy metals |
| DOI | 10.3390/min14080763 |
| 英文摘要 | Diatomite, a natural adsorbent rich in active silica, serves as a valuable precursor for geopolymer synthesis. The safe disposal of diatomite as a failed lead (Pb(II)) adsorbent is critical to prevent secondary contamination. This study investigated the immobilisation efficiency of geopolymerisation for Pb(II)-rich diatomite sludge. Low-grade diatomite with high ignition loss was utilised in the synthesis of alkali-activated geopolymers. It was demonstrated that the geopolymers achieved a compressive strength of 28.3 MPa with a 50% replacement rate of metakaolin by diatomite sludge, which was not a compromise in strength compared to that of the geopolymer with no Pb(II) (26.2 MPa). The leaching behaviour of Pb(II) was evaluated using water and acetic acid, yielding concentrations below 3 mg/L and immobilisation efficiencies of 95% in both scenarios. Analytical techniques including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) elucidated the mineral composition and chemical environment of the geopolymers. These analyses revealed that Pb(II) migrated from diatomite pores, potentially forming soluble hydroxides under sufficient hydroxide, which then participated in condensation with silicon and aluminium monomers, effectively immobilising Pb(II) within amorphous aluminosilicate gels. Furthermore, the formation of the amorphous gels within diatomite pores hindered Pb(II) leaching, encapsulating Pb(II) effectively. This study presents a novel approach to immobilising heavy metals within building materials, enhancing mineral resource utilisation efficiency while addressing environmental contamination concerns. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:001304697000001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80629]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Yu, Ting |
| 作者单位 | 1.Guangdong Univ Technol, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 3.Guangdong Prov Key Lab Dev & Comprehens Utilizat M, Guangzhou 510650, Peoples R China 4.State Key Lab Rare Met Separat & Comprehens Utiliz, Guangzhou 510650, Peoples R China 5.Guangdong Acad Sci, Inst Resources Utilizat & Rare Earth Dev, Guangzhou 510650, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Haozhe,Huang, Zhihao,Zhang, Baifa,et al. Towards Safe Diatomite Sludge Management: Lead Immobilisation via Geopolymerisation[J]. MINERALS,2024,14(8):15. |
| APA | Guo, Haozhe,Huang, Zhihao,Zhang, Baifa,Yu, Ting,Pantongsuk, Thammaros,&Yuan, Peng.(2024).Towards Safe Diatomite Sludge Management: Lead Immobilisation via Geopolymerisation.MINERALS,14(8),15. |
| MLA | Guo, Haozhe,et al."Towards Safe Diatomite Sludge Management: Lead Immobilisation via Geopolymerisation".MINERALS 14.8(2024):15. |
入库方式： OAI收割
来源：广州地球化学研究所
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