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天然黄铁矿对RhB和SRB的吸附特性比较研究
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Abstract:
以黄铁矿为吸附剂，研究其对阳离子染料罗丹明B(RhB)和阴离子染料酸性桃红(SRB)的不同吸附特性，比较吸附时间、pH和温度对黄铁矿粉末吸附RhB和SRB的影响。结果表明，黄铁矿吸附RhB和SRB的过程都符合准二级动力学模型；而等温吸附过程更符合Langmuir吸附模型。同时，热力学研究证明了黄铁矿吸附RhB和SRB是自发进行的，升高温度有利于黄铁矿粉末对RhB和SRB的吸附。经过两次煅烧后的黄铁矿，对RhB和SRB的吸附不足初始的40%，说明不具备多次重复利用的价值。
Pyrite was used as adsorbent to study the different adsorption characteristics of pyrite powder on cationic dye rhodamine B (RhB) and anionic dye sulforhodamine B (SRB). The effects of adsorption time, pH and temperature on the adsorption of RhB and SRB by pyrite powder were compared. The results showed that the processes of pyrite to adsorb RhB and SRB conformed to pseudo-second-order model. Pyrite can be better described by the Langmuir adsorption model for the isothermal adsorption process of RhB and SRB. The increase of temperature is beneficial to the adsorption of pyrite to RhB and SRB. At the same time, the thermodynamic study showed that the two adsorption processes were spontaneous. After calcination for two times, the initial adsorption of RhB and SRB was less than 40% of the initial adsorption, indicating that it did not have the value of repeated reuse.
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