A New Type Polymer Sorbents for Gold Sorption from Acid Solutions
I.A.Aliyev, A.A.Azizov, U.I.Yaqubova, N.M.Sadikhov
Abstract: This study evaluated the simple methods to improve the sorptional capability of polymeric sorbent to gold (III) ions. The polymeric sorbent is produced on the basis of phosphochlorinated industrial synthetic butadiene rubber SBR, as a result of the modification thereof by an oxidative chlorophosphorylation. In order to improve sorption efficiency of sorbents to gold ions, the non-covalent immobilization of organic sulfur containing compound to the polymer matrix was carried out. The gold embedded polymer matrix was characterized by SEM, EDX, XRD and visible absorption spectroscopy. The obtained results indicated that the polymeric sorbent contained metallic form of zero-valent gold. It was found that the average particle size of elemental gold crystals was 28, 31 nm. These results support that the sorption of gold ions by non-covalent organic sulfur compounds immobilizated polymer sorbent could be an alternative method for recovery of metallic zero-valent gold from gold solution.
Keywords: Sorption, Nanogold, phosphochlorinated polymer.
Pages: 35 – 43 | Full PDF Paper
Phytochemical Investigation of Antimicrobial Activity Leaves Extract of Kigelia africana
Rehab Mobark, Osman Mohammed and Khidir Tajelseir Othman Mustafa
Abstract: The leaves of Kigelia africana. The family of Bignoniaceae and commonly called the ohm shutter as important source for treatment in complementary medicine. The Sudanese varieties are one of the best in the market, which prompted investigation of leaves extracts. The 96% ethanolic extract exhibited significant antimicrobial activity and highlighted the biological monitoring of activity in order to isolate the active metabolites from the chloroform extract of the leaves. The presence of sterols and triterpenes, carotenoids, coumarins, alkaloids, saponins, tannins, flavonoid and carbohydrates was confirmed by phytochemical screening of the diethyl ether, methanolic and aqueous extracts. The leaves extract was monitored by analytical and preparative TLC. From the above mention extract we prepare cream and ointment as antibacterial and antifungal dosage forms.
Keywords: phytochemical screening, extract, Kigelia africana leaves, antimicrobial activity, Minerals content.
Pages: 44 – 50 | Full PDF Paper