在基质上原位生长的负载型吸附剂具有高吸附能力的优点,优异的再生性能,和对复杂废水的适应性。然而,很少考虑底物对负载型吸附剂吸附性能的影响,这将阻碍其发展和扩大应用。在这项研究中,不同基材的影响(Ti,Mo,W,CC)对负载型MoS2吸附剂的Ag+吸附行为进行了研究。吸附动力学,吸附机理,有序比较了这些支持的MoS2的可再生性。因此,在钨衬底(MoS2-W)上生长的MoS2对Ag(1.98mgcm-2和598.80mgg-1)具有显着的吸附能力,是其他三个受支持的MoS2的6.38-33倍。此外,MoS2-W还具有Ag+的超高分配系数(24.80mLcm-2),选择系数可达1984。XRD和电化学表征分析表明,负载型MoS2的Ag吸附性能与其非晶结构的程度呈正相关。衬底W具有极好的电性能,可能促进MoS2的无序生长,导致更多的活性位点暴露,并赋予MoS2-W出色的Ag+捕获性能。最后,负载型MoS2在5次吸附和解吸循环后保持了对Ag的高去除效率。本研究为促进负载型吸附剂回收重金属的实际应用提供了新的视角。
Supported-adsorbents growing on the substrate in situ are equipped with the advantages of high adsorption capacity, excellent regeneration performance, and adaptability to complex wastewater. However, the effects of substrate on the adsorption properties of supported-adsorbent are rarely considered, which will hinder its development and scale-up applications. In this study, the influences of different substrates (Ti, Mo, W, CC) on the Ag+ adsorption behavior of supported-MoS2 adsorbents were investigated. The adsorption kinetics, adsorption mechanism, and the renewability of these supported-MoS2 were compared orderly. As a result, MoS2 grown on a tungsten substrate (MoS2-W) exhibits a remarkable adsorption capacity for Ag+ (1.98 mg cm-2 and 598.80 mg g-1), which is 6.38-33 times more than the other three supported-MoS2. Moreover, the MoS2-W also possesses an ultrahigh distribution coefficient (24.80 mL cm-2) for Ag+, and the selection coefficient can reach 1984. XRD and electrochemical characterization analysis indicated that Ag+ adsorption performance of supported-MoS2 is positively correlated with the degree of its amorphous structure. Substrate W with the terrific electrical properties which may facilitate the disordered growth of MoS2, resulting in more active sites exposed, and endow MoS2-W with outstanding Ag+ capture performance. Finally, the supported-MoS2 retains a high removal efficiency of Ag+ after 5 cycles of adsorption and desorption. This study provides a novel perspective for promoting the practical application of supported-sorbents to recycle heavy metals.