Preliminary assessment of modified Kazakh natural zeolites as possible sorbents for MnO4- removal from aqueous solutions.

Abstract

A natural zeolite of Kazakh origin, as well as its three different types of chemically modified versions, were assessed from the point of view of permanganate removal yield from aqueous solutions. Modification was carried out by means of di-dodecyl-dimethyl-ammonium bromide surfactant treatment type (1). Types (2) and (3) were treated prior to DDAB wth HCl or NaCl, respectively. All sorbents display broad ranges of particle size distribution. Modification of the natural form enhances the specific surface as well as the pore volume, yet influences not in the same way the sorption yield. The process is slow, however, short-and long-term effectiveness are affected by preparation procedures. The most promising yield is exhibited by the natural zeolite that was subject to a combined acid-surfactant treatment.

Recyclable Adsorbents for Potash Brine Desalination Based on Silicate Powder: Application, Regeneration and Utilization

“…As for albite, we noticed an increase in the intensity of most of the peaks, which was possibly due to the dissolution of some amorphous impurities and the increased crystallinity of the sample [44,50]. However, the disappearance of peaks in the 2θ region of 30-33 • and 41-43 • was observed, which indicated a partial dissolution of albite according to the reaction [51]:…”

Rice Husk Cellulose-Based Adsorbent to Extract Rare Metals: Preparing and Properties

“…Adsorption is considered to be one of the rather cheap and simple techniques to apply not only in the purification processes of various aqueous systems but also in hydrometallurgy [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ], including rare earth element (REE) technology [ 26 , 27 , 28 ]. In recent years, the creation of sorbents based on waste materials, in particular those of plant nature, has represented a broad independent research direction [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ].…”