当前位置：
X-MOL 学术
›
Green Chem.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A natural deep eutectic solvent-based aqueous biphasic system coupled with MoS2 photocatalytic reduction for green recovery of gold from thiosulfate solution
Green Chemistry ( IF 9.8 ) Pub Date : 2022-09-23 , DOI: 10.1039/d2gc02917k Guiping Zhu 1 , Junhui Yu 1 , Ru Zhang 1 , Ding Chen 1 , Xiaoyu Ma 1 , Lingling Zhao 1 , Qilan Huang 1 , Xiangjun Yang 1 , Shixiong Wang 1
Green Chemistry ( IF 9.8 ) Pub Date : 2022-09-23 , DOI: 10.1039/d2gc02917k Guiping Zhu 1 , Junhui Yu 1 , Ru Zhang 1 , Ding Chen 1 , Xiaoyu Ma 1 , Lingling Zhao 1 , Qilan Huang 1 , Xiangjun Yang 1 , Shixiong Wang 1
Affiliation
|
Aqueous two-phase system (ATPS) extraction combined with a natural deep eutectic solvent (NADES) is an environmentally friendly separation process. In this work, ATPSs were constructed for the first time using NADESs, inorganic salts, and water to extract gold thiosulfate from alkaline solutions. The crucial parameters were optimized, including the types of NADESs and salts, equilibrium pH, contact time, and the initial concentration of Au(I). Thermodynamics studies showed that Au(S2O3)23− was effectively extracted into a NADES-rich phase, and this was mainly driven by an increase in entropy. Studies on the extraction mechanism indicated that the anion Au(S2O3)23− replaces the anion Cl− in NADES molecules to generate stable ion pairs with N+ through electrostatic interaction; simultaneously, new hydrogen bonds form with the acidic component. Also, amorphous MoS2 was used directly for the photocatalytic reduction of gold in the NADES-rich phase. The results showed that MoS2 can be used for efficient recovery of Au(I) and it simultaneously regenerates the NADES without destroying the structure of the extractant. Finally, a continuous cyclic experimental model is constructed. After three cycles, the extraction rate of Au(S2O3)23− by NADES–ATPS is slightly reduced from 96.2% to 93.0%, and the reduction rate of Au(S2O3)23− by MoS2 is decreased from 100.0% to 95.0%; this indicates that NADES–ATPS had excellent cycling performance. The strategy of coupling NADES–ATPSs with photocatalytic reduction with amorphous MoS2 to recover gold from thiosulfate solution is expected to contribute to the sustainable and green industrial processes of gold.
中文翻译：
一种基于天然低共熔溶剂的水性双相体系与 MoS2 光催化还原相结合用于从硫代硫酸盐溶液中绿色回收金
水相两相系统 (ATPS) 萃取与天然低共熔溶剂 (NADES) 相结合是一种环保分离工艺。在这项工作中，首次使用 NADES、无机盐和水构建了ATPS，以从碱性溶液中提取硫代硫酸金。优化了关键参数，包括NADESs和盐的类型、平衡pH、接触时间和Au( I )的初始浓度。热力学研究表明，Au(S 2 O 3 ) 2 3-被有效地提取到富含 NADES 的相中，这主要是由熵的增加驱动的。萃取机理研究表明阴离子Au(S 2 O 3 )2 3-取代NADES分子中的阴离子Cl -通过静电作用与N +产生稳定的离子对同时，与酸性成分形成新的氢键。此外，无定形 MoS 2直接用于光催化还原富 NADES 相中的金。结果表明，MoS 2可用于Au( I )的高效回收，同时在不破坏萃取剂结构的情况下再生NADES。最后，构建了一个连续循环的实验模型。三个循环后，Au(S 2 O 3 ) 2 3−的提取率NADES-ATPS从96.2%略微降低到93.0%，MoS 2对Au(S 2 O 3 ) 2 3−的还原率从100.0%降低到95.0%；这表明 NADES-ATPS 具有出色的循环性能。将 NADES-ATPSs 与无定形 MoS 2光催化还原相结合以从硫代硫酸盐溶液中回收金的策略有望促进金的可持续和绿色工业过程。
更新日期：2022-09-23
中文翻译：
一种基于天然低共熔溶剂的水性双相体系与 MoS2 光催化还原相结合用于从硫代硫酸盐溶液中绿色回收金
水相两相系统 (ATPS) 萃取与天然低共熔溶剂 (NADES) 相结合是一种环保分离工艺。在这项工作中，首次使用 NADES、无机盐和水构建了ATPS，以从碱性溶液中提取硫代硫酸金。优化了关键参数，包括NADESs和盐的类型、平衡pH、接触时间和Au( I )的初始浓度。热力学研究表明，Au(S 2 O 3 ) 2 3-被有效地提取到富含 NADES 的相中，这主要是由熵的增加驱动的。萃取机理研究表明阴离子Au(S 2 O 3 )2 3-取代NADES分子中的阴离子Cl -通过静电作用与N +产生稳定的离子对同时，与酸性成分形成新的氢键。此外，无定形 MoS 2直接用于光催化还原富 NADES 相中的金。结果表明，MoS 2可用于Au( I )的高效回收，同时在不破坏萃取剂结构的情况下再生NADES。最后，构建了一个连续循环的实验模型。三个循环后，Au(S 2 O 3 ) 2 3−的提取率NADES-ATPS从96.2%略微降低到93.0%，MoS 2对Au(S 2 O 3 ) 2 3−的还原率从100.0%降低到95.0%；这表明 NADES-ATPS 具有出色的循环性能。将 NADES-ATPSs 与无定形 MoS 2光催化还原相结合以从硫代硫酸盐溶液中回收金的策略有望促进金的可持续和绿色工业过程。
京公网安备 11010802027423号