Chen Xiao-Qin, Li Bing, Shen Yang, Guo Jian-Zhong
Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A & F University, Lin'an, Zhejiang 311300, China.
ACS Omega. 2019 Sep 9;4(12):15022-15029. doi: 10.1021/acsomega.9b01805. eCollection 2019 Sep 17.
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 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.
通过一步水热法成功合成了方解石浸渍的水热炭（Ca-HC），并将其用作修复Cu（II）的吸附剂。表征技术表明，Ca-HC含有方解石和含氧官能团。一系列在Ca-HC上的Cu（II）吸附实验表明，溶液的初始Cu（II）浓度、接触时间、吸附温度和初始pH值会影响Cu（II）的吸附。在303K下，Ca-HC对Cu（II）的实际可达到吸附容量为130.57mg/g，吸附过程符合Langmuir模型和准二级动力学方程。Cu（II）在Ca-HC上的去除主要归因于沉淀和表面络合而非离子交换。方解石在吸附过程中提供了活性位点，生成铜矾沉淀并提高了水热炭的吸附容量。因此，这些结果表明Ca-HC是一种能从水中去除Cu（II）的有效吸附剂。
