Department of Environmental Health Engineering, School of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran.
Social Determinants of Health Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
PLoS One. 2020 Apr 14;15(4):e0231045. doi: 10.1371/journal.pone.0231045. eCollection 2020.
A green synthesis approach was conducted to prepare amine-functionalized bio-graphene (AFBG) as an efficient and low cost adsorbent that can be obtained from agricultural wastes. In this study, bio-graphene was successfully used to remove Ciprofloxacin (CIP) from synthetic solutions. The efficacy of adsorbent as a function of operating variables (i.e. pH, time, AFBG dose and CIP concentration) was described by a polynomial model. A optimal99.3% experimental removal was achieved by adjusting the mixing time, AFBG dose, pH and CIP concentration to 58.16, 0.99, 7.47, and 52.9, respectively. Kinetic model revealed that CIP diffusion into the internal layers of AFBG controls the rate of the process. Furthermore, the sorption process was in monolayer with a maximum monolayer capacity of 172.6 mg/g. Adsorption also found to be favored under higher CIP concentrations. The thermodynamic parameters (ΔG°<0, ΔH°>0, and ΔS°>0) demonstrated that the process is endothermic and spontaneous in nature. The regeneration study showed that the AFBG could simply regenerated without significant lost in adsorption capacity.
采用绿色合成方法制备胺功能化生物石墨烯（AFBG）作为一种高效、低成本的吸附剂，可从农业废弃物中获得。本研究成功地利用生物石墨烯从合成溶液中去除环丙沙星（CIP）。吸附剂作为操作变量（即 pH、时间、AFBG 剂量和 CIP 浓度）的函数的功效通过多项式模型进行了描述。通过将混合时间、AFBG 剂量、pH 和 CIP 浓度分别调整为 58.16、0.99、7.47 和 52.9，可实现 99.3%的实验去除率。动力学模型表明，CIP 扩散到 AFBG 的内层控制着该过程的速率。此外，吸附过程是单层的，最大单层容量为 172.6mg/g。吸附也被发现更有利于较高的 CIP 浓度。热力学参数（ΔG°<0、ΔH°>0 和 ΔS°>0）表明该过程本质上是吸热和自发的。再生研究表明，AFBG 可以在不显著损失吸附能力的情况下简单地再生。
