The current research was performed to examine the effects of date seed-derived biochar (DSDB) for remediation of hazardous metal ions (lead (II) and cadmium (II)) from binary and single systems. The maximum sorption uptakes of 0.484 and 0.798 mmol/g were recorded for lead (II) and cadmium (II) ions, respectively, at an equilibrium pH of 4.5. For both metal ions, DSDB produced quick kinetic uptake rates with most of the removal process (90%) completed within 60 mins. Different types of models were applied to depict lead (II) and cadmium (II) isotherms (Toth, Redlich–Peterson, Freundlich, and Langmuir) and kinetics (pseudo-first and -second order) data. Desorption method was attempted and DSDB was reutilized in five consecutive cycles successfully using 0.01 M HCl as elutant. During binary sorption, decreased uptake of cadmium (II) by DSDB was observed due to the presence of lead (II). In comparison to single solute system, the uptake of cadmium (II) was reduced to 26.5% while only 1.2% reduction for lead (II) was observed. While comparing the two multi-component isotherm models (Langmuir and Freundlich), the multicomponent Langmuir model performed well in describing the cadmium (II)+lead (II) binary isotherm with high accuracy.

中文翻译：

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枣籽衍生生物炭在去除铅 (II) 和镉 (II) 离子过程中的单一和竞争性吸附潜力

目前的研究旨在检查枣子衍生生物炭 (DSDB) 对修复二元和单一系统中有害金属离子（铅 (II) 和镉 (II)）的影响。在平衡 pH 值为 4.5 时，铅 (II) 和镉 (II) 离子的最大吸附量分别为 0.484 和 0.798 mmol/g。对于这两种金属离子，DSDB 产生了快速的动力学吸收率，大部分去除过程 (90%) 在 60 分钟内完成。应用不同类型的模型来描述铅 (II) 和镉 (II) 等温线（Toth、Redlich-Peterson、Freundlich 和 Langmuir）和动力学（伪一级和二级）数据。尝试了解吸方法，并且使用 0.01 M HCl 作为洗脱液，在连续五个循环中成功地重新利用了 DSDB。在二元吸附过程中，由于铅 (II) 的存在，观察到 DSDB 对镉 (II) 的吸收减少。与单一溶质系统相比，镉 (II) 的吸收减少至 26.5%，而铅 (II) 的吸收仅减少 1.2%。在比较两种多组分等温线模型（Langmuir 和 Freundlich）时，多组分 Langmuir 模型在描述镉（II）+铅（II）二元等温线方面表现良好，精度高。