Facile Synthesis of Calcite-Impregnated Hydrochar with High Sorption Capacity for Cu(II) from Aqueous Solution
Facile Synthesis of Calcite-Impregnated Hydrochar with High Sorption Capacity for Cu(II) from Aqueous Solution
复制标题
轻松合成对水溶液中的 Cu(II) 具有高吸附能力的方解石浸渍水炭
DOI：
10.1021/acsomega.9b01805
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发表时间：
2019-09-17
期刊：
影响因子：
4.1
通讯作者：
Guo, Jian-Zhong
中科院分区：
文献类型：
--
作者：
Chen, Xiao-qin;Li, Bing;Guo, Jian-Zhong
采用一步水热法成功合成了方解石浸渍氢炭（Ca-HC），并将其作为Cu（II）的吸附剂进行修复。表征技术表明Ca-HC含有方解石和含氧官能团。一系列Cu（II）在Ca-HC上的吸附实验表明，初始Cu（II）浓度、接触时间、吸附温度和溶液初始pH对Cu（II）的吸附有影响。在303 K下，Ca-HC对Cu（II）的实际吸附量为130.57 mg g(-1)，吸附过程符合Langmuir模型和拟二级动力学方程。Cu（II）的析出和表面络合作用主要是由于Cu（II）在Ca-HC上的去除，而不是离子交换。方解石为吸附过程中产生棘石沉淀提供了活性位点，增强了水合物的吸附能力。因此，这些结果表明Ca-HC是一种有效的吸附剂，可以去除水中的Cu（II）。
Calcite-impregnated hydrochar (Ca-HC) was successfully synthesized by a one-step hydrothermal method and used as an adsorbent for Cu(II) remediation. Characterization techniques showed that Ca-HC contained calcite and oxygen-containing functional groups. A series of Cu(II) sorption experiments onto Ca-HC showed that the initial Cu(II) concentration, contact time, sorption temperature, and initial pH of the solution influenced the sorption of Cu(II). The actual achievable sorption capacity of Ca-HC for Cu(II) was 130.57 mg g(-1) at 303 K, and the sorption process obeyed the Langmuir model and pseudo-second-order kinetic equation. The precipitation and surface complexation rather than ion exchange were mainly ascribed to the removal of Cu(II) onto Ca-HC. The calcite provided the active site to produce posnjakite precipitation during the sorption process and enhance the sorption capacity of the hydrochar. Therefore, these results demonstrated that Ca-HC is an effective sorbent that can remove Cu(II) from water.