[1]鄭章宏,袁宇興,湯裕,等.磷酸鈣玻璃作為土壤和尾礦中重金屬離子的固化劑[J].中國(guó)材料進(jìn)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]
點(diǎn)擊復(fù)制
磷酸鈣玻璃作為土壤和尾礦中重金屬離子的固化劑(
)
中國(guó)材料進(jìn)展[ISSN:1674-3962/CN:61-1473/TG]
- 卷:
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- 期數(shù):
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2018年第06期
- 頁(yè)碼:
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061-66
- 欄目:
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前沿綜述
- 出版日期:
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2018-06-30
文章信息/Info
- Title:
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Calcium Phosphate Glass as Curing Agent for Heavy Metal Ions in Soil and Tailings
- 作者:
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鄭章宏; 袁宇興; 湯裕; 盧安賢
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中南大學(xué)材料科學(xué)與工程學(xué)院，湖南 長(zhǎng)沙 410083
- Author(s):
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ZHENG Zhanghong; YUAN Yuxing; TANG Yu; LU Anxian
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School of Materials Science and Engineering, Central South University, Changsha 410083, China
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- 關(guān)鍵詞:
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磷酸鈣玻璃; 重金屬離子; pH值; CaO/P2O5比; 固化率
- Keywords:
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Calcium phosphate glass; heavy metal ions; pH value; CaO/P2O5 ratio; immobilization rate
- DOI:
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10.7502/j.issn.1674-3962.2018.06.08
- 文獻(xiàn)標(biāo)志碼:
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A
- 摘要:
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利用傳統(tǒng)熔體冷卻法制備了磷酸鈣玻璃（CPG），研究了該玻璃對(duì)土壤和鉛鋅礦尾礦中Pb和Cd離子的固化行為。結(jié)果表明，四種不同組分的CPG對(duì)降低Pb和Cd離子濃度都有較好效果，與Cd離子相比，Pb離子濃度降低輻度更大；CPG中的CaO/P2O5摩爾比及CPG在溶液中的溶解度直接影響其對(duì)重金屬離子的固化效果。當(dāng)CaO/P2O5比例為4∶6時(shí)，CPG對(duì)被污染土壤和鉛鋅礦尾礦中的Pb和Cd離子固化率達(dá)到最高。由于對(duì)Pb離子的固化屬溶解沉淀機(jī)制，而對(duì)Cd離子的固化則為表面吸附與絡(luò)合作用，因此，Pb離子的固化比Cd離子的固化對(duì)pH值更敏感。研究發(fā)現(xiàn)，用CPG溶液固化被污染土壤和鉛鋅礦尾礦時(shí)Pb, Cd離子的最佳pH值分別為4和5，其最大固化率分別為7012％與6905％和5822％與5274％。
- Abstract:
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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 7012% ,6905% and 5822% and 5274%, respectively.
更新日期/Last Update:
2018-07-06