Abstract In this study, pine leaves powder (PiP) and dandelion flower powder (DFP) were repurposed to synthesize layered double hydroxides (LDHs) to form a base for sorbents used in perchlorate remediation from wastewater. The effects of the adsorbent dose, pH, thermodynamics, and coexisting ions were evaluated in batch experiments. The results revealed that 0.1 g adsorbent (PiP-LDH and DFP-LDH) removed 97% and 93% of perchlorate contaminants, respectively. In this study, the correlation coefficient of pseudo-second-order was higher than pseudo-first-order for all the LDHs. The kinetic and isotherm studies showed the best uptake of perchlorate in the short time was by PiP-LDH, followed by DFP-LDH (20 min and 40 min, respectively). The calculated and experimental values of adsorption at the equilibrium state also concurred with the pseudo-second-order model. The prepared LDHs were mesoporous. The surface area of PiP-LDH provided more adsorption sites, rendering it more suitable for perchlorate adsorption compared with the other two LDHs. The model suggests Physico-chemical interactions behind the sorption of perchlorate by LDHs. The adsorption was more influenced by anions i.e, PO43− > SO42− > NO3 than monovalent anions due to the increase in the charge radius values. The prepared LDHs could be of great benefit to the environmental remediation of wastewater bodies.

中文翻译：

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通过经济高效的松叶和蒲公英花粉层双氢化物 (LDH) 吸附剂对高氯酸盐的环境修复前景

摘要 在这项研究中，松叶粉 (PiP) 和蒲公英花粉 (DFP) 被重新用于合成层状双氢氧化物 (LDH)，以形成用于废水中高氯酸盐修复的吸附剂的基础。在批量实验中评估了吸附剂剂量、pH、热力学和共存离子的影响。结果表明，0.1 g 吸附剂（PiP-LDH 和 DFP-LDH）分别去除了 97% 和 93% 的高氯酸盐污染物。在本研究中，所有 LDH 的伪二阶相关系数高于伪一阶。动力学和等温线研究表明，在短时间内对高氯酸盐的最佳吸收是 PiP-LDH，其次是 DFP-LDH（分别为 20 分钟和 40 分钟）。平衡态吸附的计算值和实验值也与伪二阶模型一致。制备的LDHs是介孔的。与其他两种 LDH 相比，PiP-LDH 的表面积提供了更多的吸附位点，使其更适合高氯酸盐吸附。该模型表明了 LDH 吸附高氯酸盐背后的物理化学相互作用。由于电荷半径值的增加，吸附受阴离子的影响更大，即 PO43->SO42->NO3 比单价阴离子的影响更大。制备的LDHs对废水体的环境修复有很大的好处。该模型表明了 LDH 吸附高氯酸盐背后的物理化学相互作用。由于电荷半径值的增加，吸附受阴离子的影响更大，即 PO43->SO42->NO3 比单价阴离子的影响更大。制备的LDHs对废水体的环境修复有很大的好处。该模型表明了 LDH 吸附高氯酸盐背后的物理化学相互作用。由于电荷半径值的增加，吸附受阴离子的影响更大，即 PO43->SO42->NO3 比单价阴离子的影响更大。制备的LDHs对废水体的环境修复有很大的好处。