本文選題：零價鐵 + 高硫土壤　； 參考：《環(huán)境科學(xué)學(xué)報》2017年11期

【摘要】：納米零價鐵(Nanoscale zero-valent iron,n ZVI)因具有較大比表面積和較強(qiáng)還原能力,常被用于原位修復(fù)變價重金屬污染土壤,而對其應(yīng)用于高硫富銅礦山土壤的修復(fù)及機(jī)理研究卻鮮見報道.本研究以羧甲基纖維素-納米零價鐵(CMC-n ZVI)為供試材料,以廣東省大寶山礦區(qū)高硫富銅土壤為供試土壤,按水土比1 g∶5 m L將CMC-n ZVI與礦山土壤混合均勻,通過毒性淋溶提取、重金屬形態(tài)和酸可揮發(fā)性硫化物提取等實驗,探究了CMC-n ZVI對礦山土壤中Cu的固定效果及機(jī)制.結(jié)果表明:(1)CMC-n ZVI對高硫土壤中的Cu具有極好的固定效果,毒性淋溶提取實驗結(jié)果表明,n ZVI處理土壤中Cu的浸出濃度低于15 mg·kg-1,達(dá)到安全標(biāo)準(zhǔn);(2)n ZVI可促進(jìn)厭氧微生物的活性,促進(jìn)土壤中大量硫酸鹽被還原,因此Cu可能被Fe S、Fe S2吸附或直接生成硫化物沉淀,最終固定于土壤中;(3)新生成的無定形或微晶型次級鐵礦物易通過吸附或共沉淀將游離的Cu(II)固定.
[Abstract]:Nanoscale zero-valent ironn ZVI (Nanoscale zero-valent ironn ZVI) is often used in situ remediation of contaminated soils contaminated by variable valence heavy metals due to its large specific surface area and strong reduction ability, but few reports have been reported on its application in remediation and mechanism of soils in high sulfur and copper rich mountains. In this study, CMC-n ZVI was used as test material, and high sulfur and copper rich soil in Dabaoshan mining area, Guangdong Province, was used as test material. CMC-n ZVI was mixed with mine soil according to water and soil ratio of 1 g: 5 mL, and was extracted by toxic leaching. The effects and mechanism of CMC-n ZVI on Cu fixation in mine soil were studied in the experiments of heavy metal speciation and extraction of volatile sulfides. The results showed that CMC-n ZVI had excellent fixation effect on Cu in high-sulfur soils. The results of toxic leaching and extraction experiments showed that the leaching concentration of Cu in the soil treated with ZVI was less than 15 mg 路kg ~ (-1), which reached the safety standard and could promote the activity of anaerobic microorganisms. It promotes the reduction of a large amount of sulphate in soil, so Cu may be adsorbed by Fe Si Fe S 2 or precipitated directly by sulphide. The newly formed amorphous or microcrystalline secondary iron ores are easily immobilized by adsorption or coprecipitation.
【作者單位】： 中山大學(xué)環(huán)境科學(xué)與工程學(xué)院;廣西環(huán)境污染控制理論與技術(shù)重點實驗室桂林理工大學(xué)環(huán)境科學(xué)與工程學(xué)院;廣東省環(huán)境污染控制與修復(fù)技術(shù)重點實驗室;
【基金】：環(huán)保公益性行業(yè)科研專項(No.201509037) 廣東省自然科學(xué)基金(No.2014A030313200) 廣州市科技支撐項目(No.201607010065) 高�；緲I(yè)務(wù)費項目(No.15lgjc36)~~
【分類號】：X53

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