Mg/Al layered double hydroxides (LDH) intercalated by Ethylenediamine-tetramethylene phosphonic acid (EDTMP) was synthesized to remove Pb²⁺ and Cd²⁺ from aqueous solutions, and the intercalation of EDTMP enhanced the adsorption capacity of LDH for both of the heavy metal ions. At a pH of 6.5 and with an optimal intercalation amount of 20% EDTMP, the 20EDT-LDH composite demonstrated an adsorption capacity of 249.82 mg/g for Pb²⁺ and 160.85 mg/g for Cd²⁺, resulting in a removal rate of 64.34% for Pb²⁺ and 99.93% for Cd²⁺. 20EDT-LDH showed great resistance to interference ions, as it maintained satisfying adsorption performance when a much higher concentration of K⁺ and Ca²⁺ than that of Pb²⁺ and Cd²⁺ were present, with the adsorption capacity of Pb²⁺ and Cd²⁺ being greater than 83.4% and 66.3% of the maximum adsorption capacity, respectively. This was due to the strong chelation ability of EDTMP with Pb²⁺ and Cd²⁺, as confirmed by characterizations after adsorption of 20EDT-LDH with Pb²⁺ and Cd²⁺. Moreover, the affinity between EDTMP and LDH was revealed via Independent Gradient Model based on the Hirshfeld partition of molecular density (IGMH) and Hirshfeld surface analysis.

合成了乙二胺四亚甲基膦酸(EDTMP)插层的Mg/Al层状双氢氧化物(LDH)，用于去除水溶液中的Pb ²⁺和Cd ²⁺ ，EDTMP的插层增强了LDH对两种重金属离子的吸附能力。在pH为6.5、最佳插层量为20% EDTMP时，20EDT-LDH复合材料对Pb 2+ 的吸附能力为249.82 mg/g，对Cd 2+ 的吸附能力为160.85 mg/g，Pb 2+ 的去除率为64.34%，^{Cd 2+}的^去除率为^99.93 % 。20EDT-LDH表现出很强的抗干扰离子能力，当K浓度更高时，它仍能保持令人满意的吸附性能⁺和Ca ²⁺的吸附量均高于Pb ²⁺和Cd ^{2+ ，其中Pb 2+}和Cd ²⁺的吸附量分别大于最大吸附量的83.4%和66.3%。这是由于EDTMP与Pb ²⁺和Cd ²⁺具有很强的螯合能力，正如20EDT-LDH与Pb ²⁺和Cd ^{2+吸附后的表征所证实的}。此外，EDTMP 和 LDH 之间的亲和力通过基于分子密度赫什菲尔德分区 (IGMH) 和赫什菲尔德表面分析的独立梯度模型揭示。