以制备的多孔氮化硼为吸附剂,利用X射线光电子能谱技术(XPS)和BET对其进行表征,并探讨了所制备吸附剂对废水中镉和镍吸附和解吸的影响因素。吸附5min后,吸附时间的延长对镉和镍的去除率无影响;投加量的增加,使重金属镉和镍的去除率得到显著提高;pH不高于6时,去除率随pH的升高而增加。pH不高于3时,镉和镍的解吸率较高;温度升高对解吸反应有利;超声比水浴更有助于解吸率的提高,且缩短解吸平衡时间。X射线衍射、扫描电镜和红外光谱分析表明解吸后的多孔氮化硼晶型结构及表面形貌未发生明显变化,但镉和镍的吸附导致表面官能团位置发生偏移。
The prepared porous boron nitride was used as an adsorbent,characterized by XPS and BET,and the factors affecting the adsorption and desorption of cadmium(Cd) and nickel(Ni) in wastewater were discussed.After 5 minutes of adsorption,the extension of the adsorption time had no effect on the removal rate of Cd and Ni.The increase of the dosage increased the removal rate of heavy metal Cd and Ni significantly.When the pH was not higher than 6,the removal rate was worth increasing with the pH high and increasing.When the pH was not higher than 3,the desorption rate of Ca and Ni was higher,the temperature increase was beneficial to the desorption reaction.Ultrasound was more helpful than the water bath to improve the desorption rate,and shorten the desorption equilibrium time.XRD,SEM and FT-IR analysis showed that the crystal structure and surface morphology of the porous boron nitride after desorption did not change significantly,but the adsorption of Ca and Ni caused the position of the surface functional groups to shift.
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基金资助
国家自然科学基金(51608165)
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