Adsorption of nitroimidazole antibiotics from aqueous solutions on self-shaping porous biomass carbon foam pellets derived from Vallisneria natans waste as a new adsorbent
Adsorption of nitroimidazole antibiotics from aqueous solutions on self-shaping porous biomass carbon foam pellets derived from Vallisneria natans waste as a new adsorbent
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苦草废料自成型多孔生物质碳泡沫颗粒作为新型吸附剂吸附水溶液中的硝基咪唑抗生素
DOI：
10.1016/j.scitotenv.2019.01.412
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发表时间：
2019-05-10
影响因子：
9.8
通讯作者：
Yu, Zebin
中科院分区：
文献类型：
--
作者：
Sun, Lei;Wan, Shungang;Yu, Zebin
粉末状生物质吸附剂可以潜在地从废水中去除抗生素，然而，在使用后回收或分离吸附剂是困难的。采用模具辅助成型的方法制备生物质炭泡沫颗粒（BCFPs），无需压实，且添加粘结剂代替粉末吸附剂，目前鲜有报道。为此，以苦草废弃物为前驱体，探讨了BCFPs的形成机理，并研究了BCFPs对甲硝唑（MNZ）和二甲硝咪唑（DMZ）的吸附性能和吸附机理。最佳制备条件为：苦苣苔与ZnCl 2的质量比为1：2. 4，炭化温度为600 ℃，炭化时间为90 min。BCFPs的Brunauer-Emmett-Teller比表面积、总孔体积和孔隙体积分别为92256 m（2）g（-1）、0.421 cm（3）g（-1）和0.386 cm（3）g（-1）。MNZ和DMZ的吸附过程均符合准一级动力学模型。MNZ和DMZ的吸附等温线分别符合Langmuir模型和Dubininin-Radushkevic模型，最大单分子吸附容量分别为64.23和82.58 mg g（-1）。吸附过程的性质是吸热和自发的。MNZ和DMZ在BCFPs上的吸附机理主要为氢键、π-π相互作用和填充作用。利用苦草废弃物制备具有高机械强度和优良吸附性能的生物碳复合材料是可行的，不需要压实和任何粘结剂。BCFPs是一种易分离、可回收的吸附剂，平均回收率为99.6%。(C)2019 Elsevier B. V.版权所有。
Powdered biomass adsorbents can potentially remove antibiotics from wastewater However, recovering or separating the adsorbents after use is difficult. The preparation of mold-assisted shaping of biomass carbon foam pellets (BCFPs) without compaction and addition of binder instead of powdered adsorbent, is rarely reported. Therefore, the study explored the formation mechanism of BCFPs by using Vallisneria natans (V. natans) waste as precursor and investigated the adsorption performance and mechanisms of metronidazole (MNZ) and dimetridazole (DMZ) onto BCFPs. The optimal preparation conditions were V. natans-and-ZnCl2 mass ratio of 1:2.4, carbonization temperature of 600 degrees C, and time of 90 min. BCFPs exhibited uniform size, excellent floatability, and abundant micropores. The Brunauer-Emmett-Teller specific surface area, total pore volume, and micropore volume of BCFPs were 92256 m(2) g(-1), 0.421 cm(3) g(-1),and 0.386 cm(3) g(-1) respectively. The adsorption process of MNZ and DMZ was both described well by pseudo-first-order kinetic model. However, the isotherm data fitted well with Langmuir for MNZ and Dubinin-Radushkevic model for DMZ, with a maximum monolayer adsorption capacity of 64.23 and 82.58 mg g(-1), respectively. The nature of the adsorption process is endothermic and spontaneous. The adsorption mechanisms of MNZ and DMZ onto BCFPs were mainly hydrogen bonding, pi-pi interactions, and micropore filling. Preparation of BCFPs with high mechanical strength and excellent adsorption capacity from V. natans waste without compaction and any binder is feasible. furthermore, BCFPs are easily separated and recyclable adsorbents, and their average recovery rate was 99.6%. (C) 2019 Elsevier B.V. All rights reserved.