Remediation of arsenic-contaminated paddy soil by iron-modified biochar
Remediation of arsenic-contaminated paddy soil by iron-modified biochar
复制标题
铁改性生物炭修复砷污染水稻土
DOI：
10.1007/s11356-018-2268-8
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发表时间：
2018-05
影响因子：
5.8
通讯作者：
Qian ZiYan
中科院分区：
文献类型：
--
作者：
Wu Chuan;Cui MengQian;Xue ShengGuo;Li WaiChin;Huang Liu;Jiang XingXing;Qian ZiYan
水稻土砷污染对粮食安全和人类健康构成威胁，已引起全球关注。制备了不同铁材料改性的生物炭，用于污染土壤中砷（As）的固定.通过土壤培养试验，研究了生物炭-羟基硫酸铁（Biochar-FeOS）、FeCl 3（Biochar-FeCl 3）和零价铁（Biochar-Fe）对土壤pH、NaHCO 3提取态As浓度和As形态的影响。扫描电子显微镜和X射线衍射分析表明，铁被成功地负载到生物炭的表面或嵌入到孔隙中。添加生物炭-FeOS、生物炭-FeCl 3和生物炭-Fe对土壤pH值无显著影响，但显著降低了土壤NaHCO 3提取态As的含量，分别降低了13.95- 30.35%、10.97- 28.39%和17.98- 35.18%。生物炭-FeOS，生物炭-FeCl 3，和生物炭-Fe处理降低了土壤中非特异性吸附和特异性吸附的As组分的浓度，并增加了无定形和结晶不良，水合铁，铝氧化物结合，和残留的As组分。与其他铁改性生物炭相比，生物炭-FeOS表现出最有效的固定化效果，具有修复砷污染水稻土的潜力。
Arsenic contamination in paddy soils has aroused global concern due to its threats to food security and human health. Biochar modified with different iron materials was prepared for arsenic (As) immobilization in contaminated soils. Soil incubation experiments were carried to investigate the effects of biochar modified with Fe-oxyhydroxy sulfate (Biochar-FeOS), FeCl3(Biochar-FeCl3), and zero-valent iron (Biochar-Fe) on the pH, NaHCO3-extractable As concentrations, and the As fractions in soils. The scanning electron microscope and X-ray diffraction analysis demonstrated that iron was successfully loaded onto the surface or embedded into the pores of the biochar. Addition of Biochar-FeOS, Biochar-FeCl3, and Biochar-Fe had no significant effects on the soil pH but significantly decreased the contents of NaHCO3-extractable As in soils by 13.95–30.35%, 10.97–28.39%, and 17.98–35.18%, respectively. Biochar-FeOS, Biochar-FeCl3, and Biochar-Fe treatments decreased the concentrations of non-specifically sorbed and specifically sorbed As fractions in soils, and increased the amorphous and poorly crystalline, hydrated Fe, Al oxide-bound, and residual As fractions. Compared with the other iron-modified biochars, Biochar-FeOS showed the most effective immobilization and has the potential for the remediation of As-contaminated paddy soils.
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