College of Resources and Environment, Northeast Agricultural University, No.600 Changjiang Road, Xiangfang District, Harbin, 150030, China.
College of Resources and Environment, Northeast Agricultural University, No.600 Changjiang Road, Xiangfang District, Harbin, 150030, China.
Chemosphere. 2023 Jan;311(Pt 1):136884. doi: 10.1016/j.chemosphere.2022.136884. Epub 2022 Oct 17.
In this study, crayfish shell biochar (CSB) was modified by introducing vitamin C (VC) with abundant surface functional groups. CSB was impregnated with VC at different ratios and its capacity to adsorb tetracycline (TC) from water was analyzed. The physicochemical properties of CSB were determined by N adsorption-desorption isotherm analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. The effects of various factors on adsorption such as the pH, TC concentration, time, and salt ion concentrations were also investigated. Based on the chemical structure of VC, VC can provide CSB with more oxygen-containing functional groups such as hydroxyl groups. The results showed that the CSB modified with VC (CSB-VC) exhibited excellent adsorption of TC, and CSB-VC with an impregnation ratio of 2 (gVC/gCSB) had the greatest adsorption performance (saturated adsorption capacity, Q = 293.36 mg/g), whereas the adsorption performance of CSB alone was about 50% lower (Q = 172.16 mg/g). The optimal impregnation ratio VC improved the adsorption performance of CSB after modification to 70.4% of the original. Hydrogen bonding, p-p conjugation, pi-pi electron donor-acceptor effect, and π-π interactions were identified as the main adsorption mechanisms. CSB-VC was highly effective over a wide range of pH values and at high ion concentrations. Experiments demonstrated the effective regeneration of the adsorbent after multiple cycles, thereby indicating its excellent reusability. It should be noted that the adsorption capacity was good under different water quality conditions, and thus it should exhibit stable adsorption performance under complex water environment conditions.
在这项研究中，通过引入富含表面官能团的维生素 C (VC) 对小龙虾壳生物炭 (CSB) 进行了改性。将 CSB 以不同的比例浸渍在 VC 中，并分析其从水中吸附四环素 (TC) 的能力。通过 N 吸附-解吸等温线分析、X 射线衍射和傅里叶变换红外光谱对 CSB 的物理化学性质进行了测定。还研究了各种因素对吸附的影响，如 pH、TC 浓度、时间和盐离子浓度。根据 VC 的化学结构，VC 可以为 CSB 提供更多的含氧官能团，如羟基。结果表明，用 VC 改性的 CSB（CSB-VC）对 TC 表现出优异的吸附性能，浸渍比为 2（gVC/gCSB）的 CSB-VC 具有最大的吸附性能（饱和吸附容量 Q=293.36mg/g），而单独的 CSB 的吸附性能约低 50%（Q=172.16mg/g）。最佳浸渍比 VC 使改性后 CSB 的吸附性能提高了 70.4%。氢键、p-p 共轭、pi-pi 电子供体-受体效应和π-π 相互作用被确定为主要的吸附机制。CSB-VC 在很宽的 pH 值范围和高离子浓度下都具有很高的效率。实验证明了吸附剂在多次循环后能够有效再生，从而表明其具有良好的可重复使用性。应该注意的是，在不同的水质条件下吸附容量都很好，因此它应该在复杂的水环境条件下表现出稳定的吸附性能。
