Synthesis of Cost-Effective Pomelo Peel Dimethoxydiphenylsilane-Derived Materials for Pyrene Adsorption: From Surface Properties to Adsorption Mechanisms

Abstract

This study investigated the adsorption behaviors of pyrene (PYR) on a pomelo peel adsorbent (PPA), biochar (PPB), and H3PO4-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 m2 g–1), 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–1. 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.

Preparation and Modification of Mullite Whiskers/Cordierite Porous Ceramics for Cu2+ Adsorption and Removing

“…The positive value of Δ H o indicates that the adsorption process is an endothermic process. The positive value of Δ S o indicates that there is an increase in the randomness at the solid–solution interface and it is also entropically favored during the adsorption process . Therefore, the adsorption of Cu 2+ by MCK is a spontaneous endothermic process.…”

“…The positive value of ΔS o indicates that there is an increase in the randomness at the solid− solution interface and it is also entropically favored during the adsorption process. 44 Therefore, the adsorption of Cu 2+ by MCK is a spontaneous endothermic process. ACS Omega http://pubs.acs.org/journal/acsodf Article 2.2.7.…”

Development and Evaluation of Cellulose/Graphene-Oxide Based Composite for Removing Phenol from Aqueous Solutions

“…Several methods, such as chemical oxidation, photocatalytic degradation, microbial degradation, solvent extraction, and adsorption, have been developed to remove phenols and their derivatives from aqueous media [ 6 ]. Among them, adsorption is most popular due to its numerous advantages, e.g., higher removal efficiency, low adsorbent regeneration cost, low secondary pollution, low energy consumption, and easy operation [ 7 , 8 ]. Therefore, many studies focus on the adsorptive removal of phenol from aqueous systems.…”