Rubidium ion capture with composite adsorbent PMA@HKUST-1

Rubidium ion Capture with a phosphotungstic acid-functionalized finger-citron-residue-based carbon

“…Besides, the spectrum of FMC has three distinctive characteristic peaks at 3423 cm À1 , 1082 cm À1 and 464 cm À1 , representing the vibrational peaks of the Si-OH bond, the telescopic vibration of the Si-O bond, and the telescopic vibrational peak of the O-Si-O bond, respectively. 3,14,15 The characteristic peaks of FMC also appear in the spectrum of PTA@FMC materials, indicating that PTA@FMC has a similar structure as that of FMC materials. In addition, the infrared spectrum of PTA shows the characteristic peaks at 983 cm À1 and 892 cm À1 , which can be attributed to the telescopic vibration of the W]O bond and the telescopic vibration of the W-O-W bond, respectively.…”

“…Rubidium, a typical rare metal, has various applications in the eld of photocells, thermoelectric generators, alkali batteries, biological engineering, and medical industries. [1][2][3] In the recent few decades, due to the increasing demand for rubidium from industries, the price of the rubidium metal has been rocketing in comparison to those of other alkali metals. 3 Although, the total content of rubidium ions in brine lakes is relatively high, the concentration of rubidium ions in those lakes is in trace amounts.…”

“…[1][2][3] In the recent few decades, due to the increasing demand for rubidium from industries, the price of the rubidium metal has been rocketing in comparison to those of other alkali metals. 3 Although, the total content of rubidium ions in brine lakes is relatively high, the concentration of rubidium ions in those lakes is in trace amounts. 4 Consequently, the separation, condensation and purication of rubidium ions are regarded as hot issues pertinent to scientic research elds.…”

“…Studies in this attempt have been proved to be successful. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Heteropoly acids are certain substances that have adsorption affinities with heavy metal ions. 10 The introduction of a heteropoly acid on the adsorbent surface is thought to effectively enhance the chemical adsorption interactions of rubidium ions.…”

“…The use of PMA@HKUST-1 increased the adsorption amount of rubidium ions onto the adsorbents by approximately 28.5%. 3 Even then the PMA@HKUST-1 was imperfect. The microporous structure of HKUST-1 was seriously damaged aer the introduction of phosphomolybdic acid.…”