In this study, a
new Fe3O4/CNT@PDA hybrid magnetic nanocomposite
was synthesized
through a simple, environmentally friendly, cost-effective way to
remove the metribuzin herbicide and was characterized by FT-IR spectroscopy,
transmission electron microscopy , and Brunauer–Emmett–Teller
analysis. In this research, four adsorption isotherms, namely Langmuir,
Freundlich, Dubinin–Radoslovich, and Temkin were applied, and
the best results were obtained with the Freundlich model indicating
multilayer adsorption. The adsorption kinetics was more consistent
with the pseudo-second-order kinetics. The intraparticle diffusion
model proposed that the adsorption mechanism was predominantly under
the control of film diffusion. The thermodynamic parameters suggested
that the uptake of metribuzin onto Fe3O4/CNT@PDA
was physisorption, spontaneous, and exothermic and decreased the randomness
process in nature. This study showed that the Fe3O4/CNT@PDA hybrid magnetic nanocomposite can be an effective
adsorbent for removing herbicides such as metribuzin in drinking water
sources.
The purpose of this study is to investigate Microplastic pollution (MPs) in important ports of the northern coast of the Persian Gulf. MPs were identified on the northern shores of the Persian Gulf in three compartments: sediment, seawater, and four species of fish. In December 2019, sampling was conducted in 7 sampling areas. In this study, 357 MPs were identified in all samples. The predominant polymer in MPs was polypropylene (PP) and later polyethylene (PE). The most polluted areas in terms of MPs in sediments, seawater, and fish were Bushehr, Bandar Abbas, and Qeshm. The fiber was the predominant form of MPs in all sampling stations and those samples taken from the surface seawater, sediments, and fish. The presence of fishing ports with fishing tools, commercial ports, the tourist attractions, and the tourist industry in these areas was an important factor controlling the distribution of MPs in these areas.
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