Using cotton as the template and hydrotalcite as precursor,biomimetic Zn/Ti/Fe complex metal oxide(LDO) was prepared to the removal of NO3-N in water.The adsorption characteristics of NO3-N from aqueous solution by LDO and its influencing factors,such as the solution contact time,dosage,pH and initial concentration were analyzed.The adsorption behavior and mechanism were also discussed.The morphologies of samples were characterized by SEM.The results indicated that LDO had the cotton fiber's own fiber morphology.The removal rate of NO3-N was up to 88.76% when reaction time was 120min,the dosage of LDO was 0.67g/L,pH value was 7.0,temperature was 25℃and the concentration of NO3-N was 50mg/L.The equilibrium adsorption capacity was 66.57mg/g.Effluent concentration achieved Chinese “drinking water health standards” (GB 5749—2006).LDO adsorption of NO3-N had a suitable pH range.The kinetic adsorption process was fitted by pseudo-second-order kinetic model,and the adsorption was mainly chemical adsorption.Langmuir equation could simulate the material process of isothermal adsorption of NO3-N.The fitting results indicated that the adsorption of NO3-N was monolayer adsorption.Regeneration experiments showed that LDO had better regeneration under ultraviolet light,and could be reused more than three times.
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基金资助
国家自然科学基金(51278418)
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