Wei Zhengwen, Zhang Yaoyao, Wang Wei, Dong Suiming, Jiang Tingbo, Wei Donghui
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang'an University, No. 126 Yanta Road, Xi'an 710054, Shaanxi, China.
School of Water and Environment, Chang'an University, Xi'an 710054, P.R. China.
ACS Omega. 2020 Apr 16;5(16):9465-9476. doi: 10.1021/acsomega.0c00689. eCollection 2020 Apr 28.
This study investigated the adsorption behaviors of pyrene (PYR) on a pomelo peel adsorbent (PPA), biochar (PPB), and HPO-modified (HPP), NaOH-activated (NPP), and dimethoxydiphenylsilane-treated (DPDMS-NPP) pomelo peel materials. SEM, FTIR, and elemental analyses of DPDMS-NPP's surface structure showed that the material was characterized by a well-developed porous structure, a large specific surface area (698.52 m g), and an abundance of phenyl functional groups. These properties enhance the PYR adsorption performance of DPDMS-NPP. Experimental results indicated that the adsorption capacity of DPDMS-NPP was significantly affected by the amount of material used and the initial concentration of PYR. Kinetic assessments suggested that PYR adsorption on PPA, NPP, and DPDMS-NPP could be accurately described by the pseudo second-order model. The adsorption process was controlled by several mechanisms, including electron donor-acceptor (EDA), electrostatic, and π-π interactions as well as film and intraparticle diffusion. The adsorption isotherm studies showed that PYR adsorption on DPDMS-NPP and PPA was well described by the Langmuir model and the maximum Langmuir adsorption capacity of DPDMS-NPP was 531.9 μg g. Overall, the results presented herein suggested that the use of DPDMS-NPP adsorbents constitutes an economic and environmentally friendly approach for the mitigation of PYR contamination risks.
本研究考察了芘（PYR）在柚子皮吸附剂（PPA）、生物炭（PPB）以及经HPO改性（HPP）、NaOH活化（NPP）和二甲氧基二苯基硅烷处理（DPDMS-NPP）的柚子皮材料上的吸附行为。对DPDMS-NPP的表面结构进行扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和元素分析表明，该材料具有发达的多孔结构、较大的比表面积（698.52 m²/g）以及丰富的苯基官能团。这些特性增强了DPDMS-NPP对PYR的吸附性能。实验结果表明，DPDMS-NPP的吸附容量受所用材料量和PYR初始浓度的显著影响。动力学评估表明，PYR在PPA、NPP和DPDMS-NPP上的吸附可用准二级模型准确描述。吸附过程受多种机制控制，包括电子供体-受体（EDA）、静电和π-π相互作用以及膜扩散和颗粒内扩散。吸附等温线研究表明，DPDMS-NPP和PPA对PYR的吸附可用朗缪尔模型很好地描述，DPDMS-NPP的最大朗缪尔吸附容量为531.9 μg/g。总体而言，本文给出的结果表明，使用DPDMS-NPP吸附剂是一种减轻PYR污染风险的经济且环保的方法。
