荒漠区河流非常规水源砷氟协同去除材料研究
Research and development of ecological materials for unconventional water sources in rivers in desert areas——Taking arsenic and fluorine synergistic removal materials as an example
To address the issue of excessive arsenic (As) and fluorine (F) concentrations in unconventional water sources of rivers in desert areas,iron-modified corncob biochar was prepared in accordance with the principle of “treating waste with waste and using local materials”.The synergistic removal effect and adsorption mechanism of this modified biochar material on As and F in water were investigated.The effects of initial concentration,adsorption time,pH value,coexisting ions and other factors on the adsorption were explored.The materials were characterized and analyzed by scanning electron microscopy,specific surface area meter,infrared spectroscopy,X-ray and other techniques.The results show that the iron-type biochar loaded with micron-sized coal gangue powder (coal gangue/Fe@CCBC) is a mesoporous biochar with excellent pore structure,which can quickly adsorb As and F ions in water within 6 h.The optimal adsorption pH of coal gangue/Fe@CCBC for As and F is 4.0-5.0.The isothermal adsorption conforms to the Langmuir model,and the kinetic adsorption conforms to the pseudo-second-order kinetic model.$\mathrm{CO}_{3}^{2-}$ is the most influential ion on the adsorption effect.Hydroxyl (—OH) is a substance that plays a key role in the adsorption process.Metal modification can add a large amount of metal hydroxyl (M—OH) to the surface of carbon.M—OH can chemically fix As and F through complexation and ion exchange.Experiments show that coal gangue/Fe@CCBC is an adsorption material that can effectively remove As and F from water.This study provides a new way to remove the combined pollution of As and F in unconventional source water.
Modified biochar / adsorption mechanism / collaborative removal / fluorine / arsenic
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鄂尔多斯科技重大专项(ZD20232315)
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