College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
Molecules. 2022 Apr 15;27(8):2567. doi: 10.3390/molecules27082567.
Removal of steroid hormones from aqueous environment is of prevailing concern because of their adverse impact on organisms. Using biochar derived from biomass as adsorbent to remove pollutants has become more popular due to its low cost, effectiveness, and sustainability. This study evaluated the feasibility of applying corn straw biochar (CSB) and dewatered sludge biochar (DSB) to reduce 17β-estradiol (E2) from aquatic solutions by adsorption. The experimental results showed that the adsorption kinetics and isotherm behavior of E2 on the two biochars were well described by the pseudo-second-order (R2 > 0.93) and Langmuir models (R2 > 0.97). CSB has higher E2 adsorption capacity than DSB, and the maximum adsorption capacity was 99.8 mg/g obtained from Langmuir model at 298 K, which can be attributed to the higher surface area, porosity, and hydrophobicity of this adsorbent. Higher pH levels (>10.2) decreased the adsorption capacities of biochar for E2, while the ionic strength did not significantly affect the adsorption process. The regeneration ability of CSB was slightly better than that of DSB. The possible adsorption mechanism for E2 on biochar is suggested as π−π interactions, H−bonding, and micropores filling. These results indicated that CSB has more potential and application value than DSB on reducing E2 from aqueous solutions when considering economy and removal performance.
从水环境中去除类固醇激素是一个备受关注的问题，因为它们会对生物体造成不良影响。利用生物质衍生的生物炭作为吸附剂来去除污染物因其成本低、效果好和可持续性而变得越来越受欢迎。本研究评估了玉米秸秆生物炭（CSB）和脱水污泥生物炭（DSB）通过吸附从水溶液中去除 17β-雌二醇（E2）的可行性。实验结果表明，E2 在两种生物炭上的吸附动力学和等温线行为均可用准二级（R2>0.93）和朗缪尔模型（R2>0.97）很好地描述。CSB 对 E2 的吸附容量高于 DSB，在 298 K 时通过朗缪尔模型获得的最大吸附容量为 99.8 mg/g，这归因于该吸附剂具有更高的表面积、孔隙率和疏水性。较高的 pH 值（>10.2）会降低生物炭对 E2 的吸附容量，而离子强度对吸附过程的影响并不显著。CSB 的再生能力略优于 DSB。E2 在生物炭上的可能吸附机制被认为是π-π相互作用、氢键和微孔填充。这些结果表明，在考虑经济性和去除性能的情况下，CSB 比 DSB 更有潜力和应用价值，可用于从水溶液中去除 E2。
