Liu Chen, Yan Xin, Zhang He-Xin, Yang Jian-Ming, Yoon Keun-Byoung
School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China.
School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China.
Heliyon. 2024 Jul 26;10(15):e35169. doi: 10.1016/j.heliyon.2024.e35169. eCollection 2024 Aug 15.
Novel silicone-modified biochar adsorbents (BPS-MBCs) were prepared by utilizing waste black peanut shell (BPS) as a raw biochar and gamma-amino-propyl triethoxysilane (silicone) as an inorganic modifier. The novelty of this work is that the incorporation of silicone into BPS can rise the specific surface area and porosity of BPS-MBCs and elevate their adsorptions for copper (II). Sorption kinetics data for copper (II) were molded using five kinetic equations [i.e. Lagergren 1st-order and 2nd-order, intraparticle diffusion (IN-D), Elovich, and Diffusion-chemisorption]. The equilibrium adsorption data for copper (II) were analyzed using two-parameter isotherm equations [i.e. Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin] and three-parameter Sips, Redlich-Peterson and Toth isotherm models. It was validated that copper (II) sorption on BPS-MBCs matched better with pseudo-2nd-order kinetic, Diffusion-chemisorption and Langmuir isotherm models. The maximal q of BPS-MBC-400 was near 284 mg/g at 45 °C. By multi-phase fitting of IN-D modelling, intra-particle diffusion coefficient (k) and diffusion coefficient of external mass-transfer (D) for copper (II) were calculated. The low sorption energy from Temkin and mean free energy from D-R modellings implied that copper (II) sorption was initiated by weak non-covalent bond interactions. Thermodynamic parameters indicated that copper (II) on BPS-MBCs was an endothermic and spontaneous process. Recycling of BPS-MBC-400 for copper (II) suggested it has excellent reusability. The major mechanism of copper (II) on BPS-MBCs is possibly comprised of multiple processes, such as physical adsorption (electrostatic attraction), chemical adsorption (adsorption from functional groups, chelation, and ion exchange) and diffusion-chemisorption. Based on these findings, it is expects that BPS-MBCs are promising sorbents for copper (II) eradication from Cu(II)-including wastewater.
以废弃黑花生壳（BPS）为原料生物炭，γ-氨丙基三乙氧基硅烷（硅氧烷）为无机改性剂，制备了新型硅改性生物炭吸附剂（BPS-MBCs）。这项工作的新颖之处在于，将硅氧烷掺入BPS中可以提高BPS-MBCs的比表面积和孔隙率，并提高它们对铜（II）的吸附能力。使用五个动力学方程[即 Lagergren 一级和二级、颗粒内扩散（IN-D）、Elovich 和扩散-化学吸附]对铜（II）的吸附动力学数据进行建模。使用双参数等温方程[即 Langmuir、Freundlich、Dubinin-Radushkevich 和 Temkin]以及三参数 Sips、Redlich-Peterson 和 Toth 等温模型分析铜（II）的平衡吸附数据。验证了铜（II）在BPS-MBCs上的吸附与伪二级动力学、扩散-化学吸附和 Langmuir 等温模型匹配得更好。在45°C下，BPS-MBC-400的最大q接近284mg/g。通过IN-D模型的多相拟合，计算了铜（II）的颗粒内扩散系数（k）和外部传质扩散系数（D）。Temkin的低吸附能和D-R模型的平均自由能表明铜（II）的吸附是由弱非共价键相互作用引发的。热力学参数表明，BPS-MBCs上的铜（II）是一个吸热且自发的过程。BPS-MBC-400对铜（II）的循环利用表明它具有出色的可重复使用性。铜（II）在BPS-MBCs上的主要机制可能包括多个过程，如物理吸附（静电吸引）、化学吸附（官能团吸附、螯合和离子交换）和扩散-化学吸附。基于这些发现，预计BPS-MBCs是从含铜（II）废水中去除铜（II）的有前景的吸附剂。
