2,4-dinitrophenol (DNP) is found in small amounts in the effluent of many wastewater treatment plants. The contamination of drinking water with this pollutant, even in trace amounts, causes toxicity, health problems, and unfavorable taste and odor. This study aims to compare the efficiency of non-modified and modified dried sludge adsorbents in removing 2,4 DNP from aqueous solutions. The results of 2,4DNP removal by high-performance liquid chromatography method at the wavelength of 360 nm in a batch mode were obtained by changing the influential factors including contact time, pH, initial concentration of the contaminant, and adsorbent dosage. Eventually, the results were analyzed by kinetic and isotherm models. In this research, the optimal time was obtained as 60 min and pH as seven for all three adsorbents. The results showed that the removal percentage increases by rising adsorbent dosage and reducing contaminant concentration. The correlation coefficient value of linear and non-linear led that in kinetic studies, it follows the pseudo-second order model. In contrast, in isotherm studies, examining linear and non-linear models of isotherms showed that the data for every three types of adsorbents follow the Freundlich model well. The adsorption process is highly dependent on pH and affects the adsorbent surface properties, ionization degree, and removal percentage. At high pH, hydroxide ions (OH) compete with 2,4 DNP molecules for the adsorption sites. The adsorption occurs quickly and gradually reaches a constant value because, over time, the adsorption sites are occupied until reaching a saturated limit. By increasing the adsorbent dosage, the adsorption percentage increased significantly, which is due to the fact that higher amounts of adsorbent cause more adsorption sites.

在许多污水处理厂的流出物中发现少量 2,4-二硝基苯酚 (DNP)。这种污染物对饮用水的污染，即使是微量的，也会导致毒性、健康问题以及令人不快的味道和气味。本研究旨在比较未改性和改性干污泥吸附剂从水溶液中去除 2,4 DNP 的效率。通过改变接触时间、pH、污染物初始浓度和吸附剂用量等影响因素，得到高效液相色谱法在360 nm波长处批量去除2,4DNP的结果。最后，通过动力学和等温线模型分析结果。在本研究中，所有三种吸附剂的最佳时间为 60 分钟，pH 值为 7。结果表明，随着吸附剂用量的增加和污染物浓度的降低，去除率增加。线性和非线性的相关系数值导致在动力学研究中，它遵循伪二阶模型。相比之下，在等温线研究中，检查等温线的线性和非线性模型表明，每三种类型的吸附剂的数据都很好地遵循 Freundlich 模型。吸附过程高度依赖于 pH 值，并影响吸附剂的表面性质、电离度和去除百分比。在高 pH 值下，氢氧根离子 (OH) 与 2,4 DNP 分子竞争吸附位点。吸附发生得很快并逐渐达到一个恒定值，因为随着时间的推移，吸附位点被占据直到达到饱和极限。通过增加吸附剂用量，