期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 49, 期 15, 页码 9280-9288出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b01530
关键词
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资金
- BSF, The United States-Israel Binational Science Foundation [2010438]
- Israeli Ministry of Trade and Industry, Kamin Project [54914]
The presence of nanoconcentrations of persistent pharmaceuticals in treated wastewater effluent and in surface water has been frequently reported. A novel organic inorganic hybrid sorbent based on adsorbing quarternized poly vinyl-pyridinium-co-styrene (QPVPcS) to montmorillonite (MMT) was designed for the removal of the anionic micropollutants. QPVPcS-clay composites were characterized by X-ray diffraction, FTIR., thermal gravimetric analysis, Zeta potential and element analysis. Based on these measurements polymer clay micro- and nanostructures, as a function of polymer loading, were suggested. The affinity of the anionic pharmaceutical, diclofenac (DCF), to the composite was high and did not decrease dramatically with an increase of ionic strength, indicating that the interactions are not only electrostatic. The presence of humic acid (HA) did not hinder DCF removal by the composite; whereas, its filtration by granulated activated carbon (GAG) was compromised in the presence of HA. The kinetics and adsorption at equilibrium of DCF to the composite and to GAG were measured and modeled by the time dependent Langmuir equation. The adsorption of DCF to the composite was significantly faster than to GAG. Accordingly, the filtration of micro- and nanoconcentrations of DCF by composite columns, in the presence of HA, was more efficient than by GAG columns.
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