A solution culture experiment with two varieties of rice shows that the Cd conccntration inabove-ground parts of rice is one times higher under Fodeficient than Fe-sufficicnt condition,but no differcnce is found in ri...A solution culture experiment with two varieties of rice shows that the Cd conccntration inabove-ground parts of rice is one times higher under Fodeficient than Fe-sufficicnt condition,but no differcnce is found in rice mets. The two rice varieties have a different Cd uptake:Yuanyou No. 1 uptake 40% more Cd than Kechang 89-113. The Cd concentration in aboveground parts of Yuanyou No. 1 is 29 % lower than that of Kechang 89-113, but the roots of theformer accumulated more Cd than those of the latter.展开更多
采用基于密度泛函理论的第一性原理计算方法,对掺Fe和(或)Cd的闪锌矿型Zn S的电子结构进行了计算。计算结果表明,纯闪锌矿的禁带宽度为2.85 e V;掺Fe浓度为3.125%的闪锌矿禁带宽度为2.58 e V,且Fe的3d和S的3p轨道杂化在禁带中引入了两...采用基于密度泛函理论的第一性原理计算方法,对掺Fe和(或)Cd的闪锌矿型Zn S的电子结构进行了计算。计算结果表明,纯闪锌矿的禁带宽度为2.85 e V;掺Fe浓度为3.125%的闪锌矿禁带宽度为2.58 e V,且Fe的3d和S的3p轨道杂化在禁带中引入了两条杂质能级;随着掺Fe量的增加,杂质能级的宽度和峰高也随之增大;掺Cd闪锌矿的禁带宽度为2.68 e V,并在下价带底引入一条杂质能级;Fe/Cd共掺杂的闪锌矿禁带宽度为2.49 e V,在禁带中出现的两条施主杂质能级可提高闪锌矿的可见光响应及催化能力。计算结果为深入探讨天然闪锌矿的可见光催化机制提供了理论支持。展开更多
文摘A solution culture experiment with two varieties of rice shows that the Cd conccntration inabove-ground parts of rice is one times higher under Fodeficient than Fe-sufficicnt condition,but no differcnce is found in rice mets. The two rice varieties have a different Cd uptake:Yuanyou No. 1 uptake 40% more Cd than Kechang 89-113. The Cd concentration in aboveground parts of Yuanyou No. 1 is 29 % lower than that of Kechang 89-113, but the roots of theformer accumulated more Cd than those of the latter.
文摘采用基于密度泛函理论的第一性原理计算方法,对掺Fe和(或)Cd的闪锌矿型Zn S的电子结构进行了计算。计算结果表明,纯闪锌矿的禁带宽度为2.85 e V;掺Fe浓度为3.125%的闪锌矿禁带宽度为2.58 e V,且Fe的3d和S的3p轨道杂化在禁带中引入了两条杂质能级;随着掺Fe量的增加,杂质能级的宽度和峰高也随之增大;掺Cd闪锌矿的禁带宽度为2.68 e V,并在下价带底引入一条杂质能级;Fe/Cd共掺杂的闪锌矿禁带宽度为2.49 e V,在禁带中出现的两条施主杂质能级可提高闪锌矿的可见光响应及催化能力。计算结果为深入探讨天然闪锌矿的可见光催化机制提供了理论支持。
