Removal of Tetracycline Hydrochloride (TCH) in Simulated Wastewater by Zero-Valent Iron with Ultrasonic Irradiation (US-ZIV)

Abstract

In this study, ultrasonic radiation zero-valent iron is used to remove tetracycline hydrochloride in aqueous solution. Zero-valent iron was characterized by SEM and XRD. The mechanism of tetracycline hydrochloride removal process by zero-valent iron was proposed. The effects of initial pH, zerovalent iron dosage, ultrasonic power and tetracycline hydrochloride concentration on the removal of tetracycline hydrochloride in the US-ZVI system were studied in detail. The US-ZVI system produces strong reducing agent •H and new Fe 2+ , which can rapidly reduce tetracycline hydrochloride. The results show that with the US-ZVI system, a lower initial pH helps accelerate the removal of tetracycline hydrochloride. In addition, with the US-ZVI system, with the increase of initial zero-valent iron dosage can promote the degradation of tetracycline hydrochloride. However, compared with pH, the zerovalent iron dosage has less effect on the degradation of tetracycline hydrochloride. In addition, the ultrasonic wave improves the degradation of tetracycline hydrochloride by zero-valent iron. The higher the ultrasonic power, the better the removal effect of tetracycline hydrochloride. However, the initial tetracycline hydrochloride dosage has hardly affected on the degradation efficiency of tetracycline hydrochloride. And the improvement of degradation rate is mainly due to the synergy between US and ZVI. Then, the recycling experiments were carried out. Finally, according to liquid chromatographymass spectrometry results, the degradation pathway of tetracycline hydrochloride was proposed.

Porous BiVO4/Boron-Doped Diamond Heterojunction Photoanode with Enhanced Photoelectrochemical Activity

“…In general, the active oxidant species include superoxide radicals (•O 2 − ), •OH, and holes (h + ). Herein, the common scavengers include ethylene diamine tetra-acetic acid (EDTA), isopropyl alcohol (IPA), and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), which correspond to the h + , •OH, and •O 2 − , respectively [50]. The quenching experiments results show that the TCH degradation rate of the M30 is significantly limited by the addition of scavengers (Figure 6d).…”

Fabrication of easy separable and reusable MIL-125(Ti)/MIL-53(Fe) binary MOF/CNT/Alginate composite microbeads for tetracycline removal from water bodies

“…However, humans could not completely metabolize TCs and around 50–80% of the applied dosage is secreted via urine 7 . Thence, numerous developing techniques have been used for TCs removal from wastewater including; adsorption 8 , 9 , ultrasonic irradiation 10 , photocatalytic degradation 11 – 13 , membrane process 14 , and fenton oxidation 15 . Among the mentioned techniques; adsorption has been considered as the most favorable technique for the removal of TCs from wastewater owing to it is simple, economic, low-energy consumption, etc.…”