Shaker Azza M, Khedawy Mohamed, Moneer Abeer A, El-Mallah Nabila M, Ramadan Mohamed S
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.
Marine Pollution Department, Environmental Division, National Institute of Oceanography and Fisheries, NIOF, Alexandria, Egypt.
BMC Chem. 2025 Jan 10;19(1):12. doi: 10.1186/s13065-024-01363-4.
Surfactant-modified biochar is a viable adsorbent for eliminating Cr(VI) from synthetic wastewater. The biochar obtained from the zea mays plant (BC) was tailored with sodium dodecyl sulfate (SDS) as an anionic surfactant forming SDS-BC adsorbent. Different controlling conditions have been evaluated including pH of the solution, biomass concentration, primary Cr(VI) concentration, time of adsorption, and temperature. Under the best controlling circumstances, the percentage of removal has attained 99%. The pseudo-second-order kinetic model best described the removal process, according to the kinetic data, while the Temkin model, one of the applicable adsorption isotherm models, well expressed the adsorption process. The thermodynamic parameters were computed, which disclosed the spontaneity and exothermic character of the Cr(VI) elimination. According to the regeneration cycles, SDS-BC was cost-effective and had a good removal capability.
表面活性剂改性生物炭是一种从合成废水中去除六价铬的可行吸附剂。以玉米植株制备的生物炭（BC）用阴离子表面活性剂十二烷基硫酸钠（SDS）进行改性，形成SDS - BC吸附剂。研究了不同的控制条件，包括溶液pH值、生物质浓度、初始六价铬浓度、吸附时间和温度。在最佳控制条件下，去除率达到了99%。动力学数据表明，准二级动力学模型能最好地描述去除过程，而Temkin模型作为适用的吸附等温线模型之一，能很好地表达吸附过程。计算了热力学参数，结果表明六价铬的去除过程具有自发性和放热特性。根据再生循环，SDS - BC具有成本效益且去除能力良好。
