Synthesis of aluminum-doped ion-sieve manganese oxides powders with enhanced adsorption performance

Publication date: Available online 10 September 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Guotai Zhang, Jingze Zhang, Yuan Zhou, Guicai Qi, Yongmin Wu, Chunxi Hai, Weiping TangAbstractAl-doped lithium manganese oxides Li1.6AlxMn1.6-xO4 were successfully prepared by sol–gel synthesis and solid state reactions. Protonated samples were obtained by further acid treatment. Experiments were performed to study the effects of physical properties including the Al3+ doping content x and calcination temperature for optimizing the synthesis of H1.6AlxMn1.6-xO4 ion-sieve pursing nice performance such as enlarging the adsorption capacity and minimizing dissolution loss of manganese. The characteristics of a series of Al-doped ion-sieve were studied by XRD, SEM and EDS. The crystal structure was kept well after Al doping from XRD analysis. SEM and EDS showed that Al was uniformly distributed in the sample. The valence state of Mn in Al-doped ion-sieve precursor was analyzed by XPS. Adsorption/desorption experiments were carried out to evaluate the amounts of lithium extraction, lithium adsorption capacity and the manganese and aluminum dissolution loss of the ion-sieve. The results showed that the Al-doped H1.6Mn1.6O4 ion-sieve exhibited higher absorption capacity (which approached 32.6 mg g-1 while the undoped one reached only 27.6 mg g-1). Furthermore, the dissolution loss of manganese and aluminum from the Al-doped ion-sieve were the...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research