Cosorption of anionic and cationic radioactive nuclides is highly desired toward the total cleaning of radioactive contaminated wastewater. A 2D/2D multifunctional nanocomposite of MgAl-LDH/graphene oxide (GO) was fabricated using coagulation and applied for the cosorption of Sr²⁺ and SeO₄^2– from aqueous solution. The cosorption was synergetically enhanced with the copresence of each species and showed a maximum Sr²⁺ removal of 2.435 mmol/g of GO. The synergetic effect occurs only in the MgAl-LDH/GO nanocomposite because of the synchronized effect of MgAl-LDH, GO, and alkaline cations, which were not present in pure GO. The SeO₄^2– removal occurred by the interchange of the NO₃^– anion from the LDH, while the removal of Sr²⁺ occurred through coordination with carboxyl/alkoxy (−COO^–/-CO^–) groups in GO by the ring opening of epoxides. The cosorption efficiencies of Sr²⁺ and SeO₄^2– were stable in the wide pH range of 4–10. The binary (Na₂SeO₄ + SrCl₂) and ternary (Na₂SeO₄ + SrCl₂ + M⁺/M²⁺ = other metal ions or A^n– = other negative ions) systems enhanced the cosorption of Sr²⁺ and SeO₄^2– in the presence of other alkali and alkali earth metals and other anions compared with the single system. The Sr²⁺ and SeO₄^2– sorption densities were superior to previously reported values. The combined multifunctional ability and environmentally benign nature of the MgAl-LDH/GO composite is promising as a sustainable material for the total remediation of Sr²⁺ and SeO₄^2– radioactive surrogates and can also be extended to wide combinations of divalent anions and cations.

中文翻译：

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2D / 2D氧化石墨烯双层氢氧化物纳米复合材料对SeO ₄ ^2–和Sr ²⁺放射性替代物的吸附特性

阴离子和阳离子放射性核素的共吸附非常需要对放射性污染废水进行全面清洁。MgAl-LDH /氧化石墨烯（GO）的2D / 2D多功能纳米复合材料是通过凝聚法制备的，并用于水溶液中Sr ²⁺和SeO ₄ ^2–的共吸附。每种物质的共存会协同增强共吸附，并显示最大Sr ²⁺去除量为2.435 mmol / g GO。由于MgAl-LDH，GO和碱性阳离子（纯GO中不存在）的同步作用，因此仅在MgAl-LDH / GO纳米复合材料中产生协同作用。SeO ₄ ^{2 –的}去除是由于NO ₃ ^–的交换而发生的^。LDH中的阴离子，而Sr ²⁺的去除则是通过环氧化物的开环与GO中的羧基/烷氧基（-COO ^– / -CO ^–）配位而发生的。在4-10的宽pH范围内，Sr ²⁺和SeO ₄ ^2–的共吸附效率是稳定的。二元（Na ₂ SeO ₄ + SrCl ₂）和三元（Na ₂ SeO ₄ + SrCl ₂ + M ⁺ / M ²⁺ =其他金属离子或A ^{n –} =其他负离子）系统增强了Sr ²⁺和SeO ₄^{2 –}与单一系统相比，存在其他碱金属和碱土金属以及其他阴离子。Sr ²⁺和SeO ₄ ^2–的吸附密度优于以前报道的值。MgAl-LDH / GO复合材料的多功能功能和环境友好特性相结合，有望成为可持续修复Sr ²⁺和SeO ₄ ^2–放射性替代物的可持续材料，还可以扩展为二价阴离子和阳离子的广泛组合。