This work demonstrates a simple approach for the efficient removal of tetracycline (TC) antibiotic from an aqueous solution. The in situ-adsorption removal method involved instant precipitation formation of mixed metal hydroxides (MMHs), which could immediately act as a sorbent for capturing TC from an aqueous solution, by employing layered double hydroxide (LDH) components including magnesium and aluminum ions in alkaline conditions. By using this approach, 100% removal of TC can be accomplished within 4 min under optimized conditions. The fast removal possibly resulted from an instantaneous adsorption of TC molecules onto the charged surface of MMHs via hydrogen bonding and electrostatically induced attraction. The results revealed that our removal technique was superior to the use of LDH as a sorbent in terms of both removal kinetics and efficiency. Moreover, the recovery of captured TC was tested under the influence of various common anions. It was found that 98% recovery could be simply achieved by using phosphate, possibly due to its highly charged density. Furthermore, this method was successful for efficient removal of TC in real environmental water samples.

Temporal oscillations of the cerium(IV)-catalysed Belousov-Zhabotinsky reaction under addition of various Brconcentrations are investigated. The relationship between the induction period and Brconcentration, which is a controlling species in the BZ oscillating reaction, is reported. The oscillations of the Ce(IV) catalyst are followed by using UV-Vis spectrophotometric methods under closed batch and oxygen free systems. Experimental observations demonstrate that increasing Brconcentration decreases the induction period exponentially, whereas it increases the oscillation period linearly. The results reveal that the oscillations without induction period are observed by the addition of 1.0 × 10 −2 M Brconcentration. Addition of Brinto the BZ solution mainly involves the process A of the FKN mechanism. Numerical results reveal that the addition of Brincreases the production of BrMA, but decreases the induction period.