Efficacy of persulfate-based advanced oxidation process (US/PS/Fe3O4) for ciprofloxacin removal from aqueous solutions

Abstract

Research evidence has shown that pollution of surface and underground waters is the leading sources of environmental and health-related problems. Disposed unused therapeutic drugs have been known to contaminate underground water and also offer drug resistance to infection-causing bacterial. This research seeks to evaluate the use of US/PS/Fe 3 O 4 for the removal of ciprofloxacin (CIP-F) from aqueous solutions. The research also seeks to obtain the optimum set of conditions about which the highest removal efficiency of CIP-F is obtained by monitoring the used pH, Fe 3 O 4 nanoparticles (NPs) concentration, PS concentration, CIP-F concentration, and contact time. The analysis was done using a UV-Vis spectrophotometer (Cecil model CE102) set at 280 nm. The result shows that a 98.43% removal efficiency is achievable after optimization if the separation parameters were set to the optimum conditions (pH = 5, CIP-F concentration = 200 mg/L, PS concentration = 0.15 mol/L, Fe 3 O 4 concentration = 0.01 g/L and contact time = 45 min). The reaction was also observed to follow the pseudo-first-order reaction model. Since the results obtained show that US/PS/Fe 3 O 4 can effectively and efficiently aid the surface adsorption of CIP-F from aqueous solutions, it is therefore recommended based on experimental findings that US/PS/Fe 3 O 4 be used for removing CIP-F from effluents.

Studying adsorption of methylene blue onto chitosan – mangetite composite

“…Có nhiều phương pháp để loại bỏ các chất màu nói chung và MB ra khỏi nguồn nước như phương pháp oxi hóa [2], phương pháp hóa học [3], phương pháp sinh học [4] nhưng phương pháp hấp phụ được nhiều nghiên cứu lựa chọn bởi chi phí xử lý thấp, hiệu quả cao, công nghệ đơn giản [5][6][7][8][9]. Cho đến nay, rất nhiều các chất hấp phụ đã được sử dụng để loại bỏ MB ra khỏi môi trường nước như CNTs [8], các oxit kim loại [10], vỏ trấu [11], mùn cưa [12], … Tuy nhiên các chất này có dung lượng hấp phụ thấp, thời gian hấp phụ kéo dài.…”

The impact of COVID-19 on stock returns of listed firms on the stock market: Ghana's experience

“…A study by Olufemi and Bolanle (2018) on the examination of the international portfolio diversification of the Nigeria Stock Market concluded that the Nigerian stock market has suffered from the shocks of crises. Based on such findings, Ahmadi et al (2020) pointed out that the stock market is safe for investors before the COVID-19 crises, but in these times, COVID-19 has made it difficult to invest.…”

“…The COVID-19 pandemic which has affected many, resulting in deaths had also greatly impacted the stock exchange market all over the world. A study by Ahmadi et al (2020) on the effects of COVID-19 outbreak on the Nigerian stock exchange performance pointed out that there is a loss in stock returns. It was further revealed that the returns on stocks have seen high levels of volatility under the period of COVID-19.…”

“…Researchers have in various ways attempted to ascertain the impact of pandemics including COVID-19, but these studies were much focused on the impact on economies. Few studies were also conducted with focus of the impact on the stock exchange markets (Ahmadi et al, 2020;Liu et al, 2020). In Ghana, even though scholars and experts in the field of economics and finance have expressed their opinions and perceptions on the effect of the pandemic on the Ghana Stock Exchange, there has been no study conducted to that effect.…”

Iron (II) Absorption from Groundwater by Natural Peat Soil at its in-Situ Conditions.(Dept.C)

“…The removal % of Pb (II) using Kaolinite/Smectite reached 75 % at 120 min. In [42], indicated that US/PS/Fe 3 O 4 process can effectively and efficiently aid the surface adsorption of CIP-F from aqueous solutions with 98.3% of removal efficiency percentage at pH = 5, CIP-F concentration= 200 mg/L, PS concentration = 0.15 mol/L and Fe 3 O 4 concentration = 0.01 g/L at a resident time of 45 min.…”