铁氮改性生物炭同时吸附废水中四环素、铵和磷酸盐：动力学、等温线、热力学和机制。
Simultaneous adsorption of tetracycline, ammonium and phosphate from wastewater by iron and nitrogen modified biochar: Kinetics, isotherm, thermodynamic and mechanism.
机构信息
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055, Shaanxi, Xi'an, China; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, China.
State Engineering Research Center of Water Resources, Harbin Institute of Technology, Harbin, 150090, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
出版信息
Chemosphere. 2022 Apr;293:133574. doi: 10.1016/j.chemosphere.2022.133574. Epub 2022 Jan 8.
The simultaneous removal of various pollutants in wastewater is increasingly deserved attention. In this study, an efficient adsorbent Fe/N@BC was synthesized by Fe-N co-modification. The adsorbability of Fe/N@BC was evaluated using a mixture with tetracycline (TC), NH-N and POP. In comparison to BC, N@BC and Fe@BC, Fe/N@BC exhibited an excellent performance for simultaneously absorbing TC, NH-N and POP. The pseudo-first-order was used to describe the adsorption process of NH-N and POP, while the pseudo-second-order could be well fitted to TC adsorption data. The adsorption isotherms of TC, NH-N and POP were more in line with Sips model (Adj.R > 0.97). The maximum adsorption capacities of Fe/N@BC towards TC, NH-N and POP were 238.94, 111.87 and 165.02 mg g, respectively, which were 1.31-1.91 times than that of BC, N@BC and Fe@BC. The simultaneous adsorption mechanism mainly involved pore filling, electrostatic interaction, ion exchange, surface complexation, surface precipitation, H bond and π-π interaction. Furthermore, after six cycles, the removal efficiencies of TC, NH-N and POP were 75.3, 66.1 and 64.5% by Fe/N@BC, highlighting its promising potential to adsorb multi-pollutants from aqueous solution.
同时去除废水中的各种污染物越来越受到关注。在本研究中，通过 Fe-N 共修饰合成了一种高效的吸附剂 Fe/N@BC。使用含有四环素 (TC)、NH-N 和 POP 的混合物来评估 Fe/N@BC 的吸附能力。与 BC、N@BC 和 Fe@BC 相比，Fe/N@BC 对 TC、NH-N 和 POP 的同时吸附表现出优异的性能。准一级用于描述 NH-N 和 POP 的吸附过程，而准二级可以很好地拟合 TC 的吸附数据。TC、NH-N 和 POP 的吸附等温线更符合 Sips 模型（Adj.R > 0.97）。Fe/N@BC 对 TC、NH-N 和 POP 的最大吸附容量分别为 238.94、111.87 和 165.02 mg g，分别是 BC、N@BC 和 Fe@BC 的 1.31-1.91 倍。同时吸附的机制主要包括孔填充、静电相互作用、离子交换、表面络合、表面沉淀、氢键和 π-π 相互作用。此外，经过六次循环后，Fe/N@BC 对 TC、NH-N 和 POP 的去除效率分别为 75.3%、66.1%和 64.5%，这突出了其从水溶液中吸附多种污染物的有前途的潜力。
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