Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Bioresour Technol. 2019 Sep;288:121593. doi: 10.1016/j.biortech.2019.121593. Epub 2019 Jun 1.
A highly efficient modified hydrochar material by HO and ultrasonic synergistic treatment was prepared for Pb removal in aqueous solution. The removal mechanism was investigated by a number of techniques and was provided by quantitative calculation. The maximum adsorption capacity of Pb by the modified hydrochar was calculated to be 92.80 mg g at pH 5.0 and 298 K, which was more than 42 times higher than pristine hydrochar (2.20 mg g) and much higher than the other reported modified hydrochar materials. The characterization results showed that HO treatment changed elemental composition, surface charge and increased oxygen-containing functional groups of the hydrochar. The mechanism study indicated that complexation with free carboxyl and hydroxyl and cation-π interaction were main mechanisms responsible for Pb sorption and their corresponding contribution percentage of different mechanisms to the Pb sorption was accounting for 62.12%, 27.14% and 10.74%, respectively.
一种高效的改性水炭材料通过 HO 和超声协同处理制备，用于水溶液中 Pb 的去除。通过多种技术研究了去除机制，并通过定量计算提供了去除机制。在 pH 5.0 和 298 K 下，改性水炭对 Pb 的最大吸附容量计算为 92.80 mg g，比原始水炭（2.20 mg g）高 42 倍以上，也比其他报道的改性水炭材料高得多。表征结果表明，HO 处理改变了水炭的元素组成、表面电荷和增加了含氧官能团。机理研究表明，与游离羧基和羟基的络合以及阳离子-π 相互作用是 Pb 吸附的主要机理，它们对 Pb 吸附的贡献比例分别为 62.12%、27.14%和 10.74%。
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