Department of Environmental Science, Babasaheb Bhimrao Ambedkar University, Lucknow, 226025, India.
Department of Environmental Science, Babasaheb Bhimrao Ambedkar University, Lucknow, 226025, India.
J Environ Manage. 2019 Oct 15;248:109235. doi: 10.1016/j.jenvman.2019.07.006. Epub 2019 Jul 13.
The present study is focusing on utilization of a new feedstock material for the preparation of biochar. The dry waste leaves litter of Tectona and Lagerstroemia speciosa was used for synthesizing the biochar at 800 °C for 1 h in muffle furnace represents as TB 800 and LB 800 and then used for the removal of As(III) and As(V) from aqueous solution. The prepared biochar materials had a crystalline structure and was characterized by using Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX), Brunaur emmit teller (BET), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Zeta potential, particle size and X-ray photoelectron spectroscopy (XPS). In regeneration study it was observed that prepared biochar material could be used up to four times with good removal percentage of Arsenic (III and V). The experimental data fitted well by Langmuir model for As(V) removal using TB 800 and LB 800, Freundlich model for As(III) removal by LB 800 and Temkin model for As(III) removal by TB 800. Pseudo-second-order kinetics was followed and best fitted with the obtained data of As(III) and (V) removal. Thermodynamics study revealed that the process of adsorption was endothermic for the removal of As(III) and exothermic for the adsorption of As(V) using TB 800 and LB 800. The adsorption capacity obtained for the removal of As(III) was 666.7 μg/g and 454.54 μg/g for TB 800 and LB 800, respectively and adsorption capacity for As(V) was 1250 μg/g for TB 800 and 714.28 μg/g was attained by LB 800.
本研究专注于利用一种新的原料制备生物炭。在马弗炉中，以 800°C 加热 1 小时，使用干燥的废物落叶（柚木和紫薇）作为合成生物炭的原料，分别表示为 TB800 和 LB800，然后用于从水溶液中去除 As(III)和 As(V)。所制备的生物炭材料具有结晶结构，并通过使用扫描电子显微镜（SEM）、能量色散 X 射线（EDX）、BET、傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、Zeta 电位、粒度和 X 射线光电子能谱（XPS）进行了表征。在再生研究中，观察到制备的生物炭材料可以使用四次，对砷（III 和 V）的去除率仍保持在较好的水平。使用 TB800 和 LB800 去除 As(V)的实验数据拟合 Langmuir 模型，LB800 去除 As(III)的实验数据拟合 Freundlich 模型，TB800 去除 As(III)的实验数据拟合 Temkin 模型。准二级动力学模型较好地拟合了 As(III)和 (V)的去除数据。热力学研究表明，TB800 和 LB800 对 As(III)的吸附过程是吸热的，对 As(V)的吸附过程是放热的。TB800 去除 As(III)的吸附容量为 666.7μg/g，LB800 为 454.54μg/g，TB800 去除 As(V)的吸附容量为 1250μg/g，LB800 为 714.28μg/g。
