Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-efficiency Utilization, Zhejiang A & F University, Hangzhou 311300, Zhejiang, PR China.
Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-efficiency Utilization, Zhejiang A & F University, Hangzhou 311300, Zhejiang, PR China.
Environ Pollut. 2019 Nov;254(Pt B):113014. doi: 10.1016/j.envpol.2019.113014. Epub 2019 Aug 7.
A new carboxylate-functionalized hydrochar (CFHC) was successfully prepared by reaction of hydrochar with maleic anhydride under solvent-free conditions and followed by deprotonating carboxyl group of hydrochar with NaHCO solution. CFHC was characterized using X-ray photoelectron spectroscopy (XPS), elemental analysis (EA), zeta potential, Brunauer-Emmett-Teller surface area (BET) and Fourier-transform infrared spectroscopy (FTIR), and its adsorption properties and mechanisms to methylene blue (MB) and Cd(II) were investigated using the batch method. The isotherm adsorption data were accorded with Langmuir model and the maximum uptakes were 1155.57 and 90.99 mg/g for MB and Cd(II) at the temperature of 303 K, respectively. The joint analysis of batch experiments and characterizations of hydrochar confirmed the π-π interaction was accompanied by electrostatic interaction and hydrogen bond for MB adsorption, while the surface complexation and ion exchange were predominant mechanisms for Cd(II) adsorption. Therefore, a highly effective adsorbent CFHC prepared by a simple and environmentally friendly solid-phase synthesis is a promising candidate for wastewater treatment.
一种新型的羧酸功能化水炭（CFHC）通过在无溶剂条件下使水炭与顺丁烯二酸酐反应，并随后用碳酸氢钠溶液使水炭的羧基脱质子化而成功制备。通过 X 射线光电子能谱（XPS）、元素分析（EA）、动电电位、Brunauer-Emmett-Teller 表面积（BET）和傅里叶变换红外光谱（FTIR）对 CFHC 进行了表征，并采用间歇法研究了其对亚甲基蓝（MB）和 Cd(II)的吸附性能和机制。等温吸附数据符合朗缪尔模型，在 303 K 时，MB 和 Cd(II)的最大吸附量分别为 1155.57 和 90.99 mg/g。间歇实验和水炭特性的综合分析证实，MB 的吸附伴随着π-π 相互作用和静电相互作用以及氢键，而 Cd(II)的吸附主要是通过表面络合和离子交换机制。因此，通过简单环保的固相合成制备的高效吸附剂 CFHC 是一种很有前途的废水处理候选材料。
