This study highlights the significance of increasing the phytoremediation treatment of Nelumbo nucifera plant efficiency using treated nanoclay soil to adjust its surface charge. The treated nanoclay consisted of zeta potential values of -11.41, -28.7, and −42.5 mV for pH 4, 6, and 10, respectively. The biochemical oxygen demand (BOD), chemical oxygen demand (COD), and nitrate removals (NO₃⁻) for the reference samples were −6.1 %, −5%, and 10.2 %, respectively, without the plant and soil, on day 5 of observation. With the plant, the biochemical oxygen demand removal efficiency increased to 51.7 % when treated with as-received clay and followed by 78.7 %, 73.7 %, and 77.3 % when treated with nanoclay soil at pH 4, 6, and 10, respectively. The chemical oxygen demand removal efficiency also increased to 32.4 % when treated with as-received soil, followed by 66.7 %, 70 %, 62.7 % when treated with pH 4, 6, and 10, respectively. The significant changes were noticed on the N adsorption capacity represented by the NO₃⁻ removal efficiency of as-received clay increased from 18.1%–54.5%, 64.5 %, and 70 % when treated with pH 4, 6, and 10, respectively. Here, we suggest that the surface charge of nanoclay particles in the basic condition is the important step to allow high N adsorption.

这项研究强调了使用经过处理的纳米粘土土壤来调节其表面电荷，以提高对莲lum植物的植物修复处理的重要性。对于pH 4、6和10，处理过的纳米粘土的ζ电势值分别为-11.41，-28.7和-42.5 mV。生化需氧量（BOD），化学需氧量（COD）和硝酸清除（NO ₃ ^-在观察的第5天，不含植物和土壤的参考样品的）分别为-6.1％，-5％和10.2％。对于这种植物，当用原样的粘土处理时，生化需氧量去除效率提高到51.7％，而当用pH值为4、6和10的纳米粘土处理时，其生化需氧量去除效率分别提高到78.7％，73.7％和77.3％。用原样土壤处理时，化学需氧量去除效率也提高到32.4％，然后分别用pH 4、6和10处理时，化学需氧量去除效率分别提高到66.7％，70％，62.7％。注意到NO _3-代表的N吸附容量发生了显着变化^。分别用pH 4、6和10处理后，原样粘土的去除效率分别从18.1％–54.5％，64.5％和70％提高。在这里，我们建议在基本条件下纳米粘土颗粒的表面电荷是允许高氮吸附的重要步​​骤。