College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
Int J Environ Res Public Health. 2020 Nov 12;17(22):8377. doi: 10.3390/ijerph17228377.
The occurrence of environmental endocrine disrupting chemicals (EDCs) in aquatic environments has caused extensive concern. Graphene-like magnetic sawdust biochar was synthesized using potassium ferrate (KFeO) to make activated sawdust biochar and applied for the removal of 17-estradiol (E2). The characterization showed that the surface morphology of five graphene-like magnetic sawdust biochars prepared with different preparation conditions were quite different. The specific surface area and pore structure increased with the increment of KFeO addition. The results have shown that graphene-like magnetic sawdust biochar (1:1/900 °C) had the best removal on E2. The experimental results indicated that pseudo-first-order kinetic model and the Langmuir model could describe the adsorption process well, in which the equilibrium adsorption capacity () of 1:1/900 °C were 59.18 mg·g obtained from pseudo-first-order kinetic model and the maximum adsorption capacity () of 1:1/900 °C were 133.45 mg·g obtained from Langmuir model at 298K. At the same time, lower temperatures, the presence of humic acid (HA), and the presence of NaCl could be regulated to change the adsorption reaction in order to remove E2. Adsorption capacity was decreased with the increase of solution pH because pH value not only changed the surface charge of graphene-like magnetic sawdust biochar, but also affected the E2 in the water. The possible adsorption mechanism for E2 adsorption on graphene-like magnetic sawdust biochar was multifaceted, involving chemical adsorption and physical absorption, such as H-bonding, π-π interactions, micropore filling effects, and electrostatic interaction. To sum up, graphene-like magnetic sawdust biochar was found to be a promising absorbent for E2 removal from water.
环境内分泌干扰物（EDCs）在水环境中的出现引起了广泛关注。使用高铁酸钾（KFeO）合成了类石墨烯磁性锯末生物炭，使其成为一种用于去除 17-雌二醇（E2）的活性锯末生物炭。表征表明，用不同制备条件制备的 5 种类石墨烯磁性锯末生物炭的表面形态差异很大。比表面积和孔结构随 KFeO 加量的增加而增加。结果表明，类石墨烯磁性锯末生物炭（1:1/900℃）对 E2 的去除效果最好。实验结果表明，准一级动力学模型和 Langmuir 模型均能很好地描述吸附过程，其中准一级动力学模型得到的 1:1/900℃的平衡吸附容量（q e）为 59.18mg·g -1 ，Langmuir 模型得到的 1:1/900℃的最大吸附容量（q m）为 133.45mg·g -1 ，均在 298K 时获得。同时，较低的温度、腐殖酸（HA）的存在和 NaCl 的存在可以调节吸附反应以去除 E2。吸附容量随溶液 pH 值的增加而降低，因为 pH 值不仅改变了类石墨烯磁性锯末生物炭的表面电荷，还影响了水中的 E2。类石墨烯磁性锯末生物炭对 E2 的吸附可能涉及多种吸附机制，包括氢键、π-π相互作用、微孔填充效应和静电相互作用等化学吸附和物理吸收。总之，类石墨烯磁性锯末生物炭被发现是一种很有前途的从水中去除 E2 的吸附剂。
