Adsorptive Removal of Bisphenol A Using N-Doped Biochar Made of Ulva prolifera
Adsorptive Removal of Bisphenol A Using N-Doped Biochar Made of Ulva prolifera
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利用石莼 N 掺杂生物炭吸附去除双酚 A
DOI：
10.1007/s11270-017-3516-0
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发表时间：
2017-09
期刊：
影响因子：
--
通讯作者：
Luo Yongming
中科院分区：
文献类型：
--
作者：
Lu Jian;Zhang Cui;Wu Jun;Luo Yongming
浒苔（U. prolifera）是一种海洋大型藻类，由于海洋富营养化而能够形成绿潮，其过量的生物量已成为沿海地区环境和经济发展的巨大负担。由于绿潮爆发，海滩上堆满了新鲜的浒苔生物量，因此采集了浒苔样本。通过快速水热碳化工艺制备了氮含量为2.6%的掺氮碳吸附剂（浒苔基生物炭），用于吸附去除被称为内分泌干扰物（EDC）的双酚A（BPA）。生物炭的 Brunauer-Emmet-Teller (BET) 比表面积为 25.43 m2 g−1，超出了许多藻类生物炭的比表面积。使用基于 U. prolifera 的生物炭实现了 BPA 的高效吸附去除。大部分 BPA 在 4 小时内被去除。 BPA 在 U. prolifera 基生物炭上的吸附动力学符合二阶模型。当pH从4.0增加到10.0时，实验吸附容量从9.38±0.11到9.68±0.21mg·g−1略有变化，表明大多数情况下废水pH对藻类生物炭吸附BPA的影响可以忽略不计。 Langmuir 等温线与 BPA 吸附数据吻合良好。高温可以增强生物炭对 BPA 的吸附。根据 Langmuir 模型，当温度从 25 °C 升高到 45 °C 时，BPA 的吸附容量（Qm）从 33.30 mg g−1 增加到 84.19 mg g−1。高离子强度导致BPA吸附量增加。当离子强度从 0 增加到 500 mM 时，吸附容量 (Qm) 几乎翻倍。这些发现表明了一种以低成本处理沿海地区过量的浒苔生物量和控制酚类 EDC 污染的有前途的方法。
Excess biomass of Ulva prolifera (U. prolifera) which is a marine macroalgae capable of forming green tides due to the marine eutrophication has become a huge burden for both environment and economic development in the coastal zone. U. prolifera samples were collected from a beach that was piled up with fresh U. prolifera biomass due to the outbreak of green tide. The N-doped carbon adsorbent (U. prolifera-based biochar) with N content of 2.6% was prepared through a rapid hydrothermal carbonization process, and used for the adsorptive removal of bisphenol A (BPA) known as endocrine-disrupting chemicals (EDCs). The Brunauer-Emmet-Teller (BET) specific surface area of the biochar was 25.43 m2 g−1, which was beyond those of many algal biochars. Efficient adsorptive removal of BPA using U. prolifera based biochar was achieved. Most of BPA was removed within 4 h. The adsorption kinetics of BPA on U. prolifera based biochar fitted second-order model. The experimental adsorption capacities slightly changed from 9.38 ± 0.11 to 9.68 ± 0.21 mg g−1 when the pH increased from 4.0 to 10.0, indicating that the influence of wastewater pH on the adsorption of BPA by the algal biochar can be neglected in most cases. The Langmuir isotherm fitted well with the BPA adsorption data. High temperature could enhance BPA adsorption on the biochar. According to the Langmuir model, the adsorption capacity (Qm) of BPA increased from 33.30 to 84.19 mg g−1 when the temperature increased from 25 to 45 °C. High ionic strength led to the increase in the adsorption of BPA. The adsorption capacity (Qm) almost doubled when the ionic strength increased from 0 to 500 mM. These findings indicate a promising way to treat the excess U. prolifera biomass in coastal zone and control phenolic EDCs pollution at low cost.
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