中文关键词生物炭镧铈五价砷吸附 英文关键词biocharlanthanumceriumAs (Ⅴ)adsorption

作者	单位	E-mail
李锦	云南农业大学资源与环境学院, 昆明 650201 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085	maxbai123@163.com
祖艳群	云南农业大学资源与环境学院, 昆明 650201
李刚	中国科学院城市环境研究所城市环境与健康重点实验室, 厦门 361021
孙国新	中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085	gxsun@rcees.ac.cn

中文摘要 本实验采用一步热解法制备载稀土元素镧和铈生物炭（La-BC、Ce-BC），并对其吸附As（Ⅴ）的机制进行讨论.吸附实验结果表明，相对于BC、Ce-BC，La-BC对As（Ⅴ）有较强的吸附能力，在pH=7时理论最大吸附量为20.1 mg·g^-1.在pH为5~9范围内随pH升高吸附量降低，最高（pH=5）为39.1 mg·g^-1，最低（pH=9）仅为17.6 mg·g^-1，在酸性条件下吸附能力较强.根据SEM-EDS、FTIR、XPS分析，吸附机制为La-BC上C=O与La—O官能团参与吸附As（Ⅴ）并分别转化为C—O和La—OH.Ce-BC对As（Ⅴ）吸附能力较差，是由于Ce-BC上虽然存在C=O与Ce—O官能团，但无法参与吸附As（Ⅴ）. 英文摘要 Loaded lanthanum or cerium biochars were prepared by one step pyrolysis of La (NO₃)₃-laden or Ce (NO₃)₃-laden rice hulls and were employed for enhancing the adsorption of As (Ⅴ) from water. In contrast with BC and Ce-BC in this study, La-BC had better adsorption capacity in the acidic condition. The maximum adsorption capacity could reach 20.1 mg ·g^-1. With increased pH, the adsorption capacity of La-BC was reduced. The highest adsorption capacity reached 39.1 mg ·g^-1 (pH=5) and the lowest was 17.6 mg ·g^-1 (pH=9). The resulting La-BC with As (Ⅴ) adsorption was characterized by SEM-EDS, FTIR, and XPS. There were two types of active adsorption sites for As (Ⅴ), oxygen-rich functional groups and lanthanum oxide. Although Ce-BC had oxygen-rich functional groups and cerium oxide, it was unable to participate in the adsorption of As (Ⅴ) from water.

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