Guangdong Provincial Key Laboratory for Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China; School of Civil Engineering, Guangzhou University, Guangzhou, 510006, PR China.
Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Universidade de Santiago de Compostela, 27002, Lugo, Spain.
J Environ Manage. 2021 Aug 15;292:112764. doi: 10.1016/j.jenvman.2021.112764. Epub 2021 May 10.
A novel phosphorus (P) modified biochar (PLBC) was produced by pyrolyzing biomass of the dietic herb Taraxacum mongolicum Hand-Mazz (TMHM) and treating it with monopotassium phosphate (KHPO). This phosphorous loaded biochar was then assessed as adsorbent for As(III) removal from contaminated water. In the current research, the adsorbent was characterized before and after P loading by means of SEM-EDX, TEM, FTIR and XRD techniques. It was evidenced that the presence of P on the surface of the biochar (BC) could improve its efficiency to remove As(III) from contaminated environments. Adsorption kinetics were evaluated by performing batch-type experiments at varied times and pH values (5, 7 and 9). The kinetic study revealed that a contact time of 24 h was required to attain equilibrium and the experimental data were best fitted to the pseudo-second-order kinetic model (q = 17.1 mg g). In addition, several batch experiments were conducted with varied arsenic concentrations. During the adsorption tests, the maximum adsorption of As(III) was found at pH 5. The adsorption study further showed that compared to BC, PLBC depicted increased removal of As(III) from contaminated solutions. The adsorption experimental data showed the best fit to the Langmuir isotherm model (with R = 0.84), with maximum As(III) adsorption capacity reaching 30.76 mg g for PLBC.
一种新型的磷（P）修饰生物炭（PLBC）是通过热解药食同源植物蒲公英（TMHM）生物质并用磷酸二氢钾（KHPO）处理制得的。然后，将这种负载磷的生物炭作为吸附剂，用于去除受污染水中的砷（III）。在目前的研究中，通过 SEM-EDX、TEM、FTIR 和 XRD 技术对负载 P 前后的吸附剂进行了表征。结果表明，生物炭（BC）表面的 P 存在可以提高其从受污染环境中去除砷（III）的效率。通过在不同时间和 pH 值（5、7 和 9）下进行批式实验评估了吸附动力学。动力学研究表明，需要 24 小时的接触时间才能达到平衡，实验数据最好拟合伪二级动力学模型（q = 17.1 mg g）。此外，还进行了一系列不同砷浓度的批量实验。在吸附测试中，发现 pH 5 时砷（III）的最大吸附量。吸附研究进一步表明，与 BC 相比，PLBC 从受污染溶液中去除砷（III）的能力有所提高。吸附实验数据与 Langmuir 等温线模型拟合最好（R = 0.84），PLBC 的最大砷（III）吸附容量达到 30.76 mg g。
