| 钠化改性河南南部膨润土吸附亚甲基蓝性能分析 |
| 摘要点击 1160 全文点击 342 投稿时间：2022-02-24 修订日期：2022-04-09 |
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| 中文关键词 钠基膨润土 吸附 亚甲基蓝 吸附机制 动力学模型 |
| 英文关键词 sodium-based bentonite adsorption methylene blue adsorption mechanism kinetics model |
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| 中文摘要 |
| 以河南南部天然钙基膨润土为原料，通过钠化改性得到了钠基膨润土.通过调控吸附剂用量、亚甲基蓝（MB）浓度、吸附时间、溶液pH值和温度，分析对比了天然钙基膨润土（PRT-1）、钙基提纯膨润土（PRT-1T）和钠基膨润土（PRT-1Na）对MB的去除效率.同时，对PRT-1T和PRT-1Na对MB的吸附动力学和吸附机制进行了研究.结果表明，由于PRT-1Na有更大的比表面积、更高的阳离子交换容量和更丰富的羟基结构，表现出对MB更好的吸附效果.在同等吸附条件下，PRT-1Na的吸附效果是PRT-1的4倍，PRT-1T是PRT-1的2倍.在20℃，pH为6，PRT-1Na用量为1.0 g，吸附时间为2 h，MB为500 mL，且初始浓度为500 mg·L-1时，MB去除率高达99.89%.另外，PRT-1Na对MB染料废水的吸附既存在物理吸附也有化学吸附，Elovich模型对PRT-1T和PRT-1Na吸附MB染料废水的过程拟合度均高，但伪一级动力学模型对PRT-1Na拟合效果最好. |
| 英文摘要 |
| Natural calcium-based bentonite from southern Henan province was used as raw material, and sodium-based bentonite was obtained through sodium modification. The removal efficiency of natural calcium-based bentonite (PRT-1), calcium-based purified bentonite (PRT-1T), and sodium-based bentonite (PRT-1Na) on MB was analyzed and compared by regulating the adsorbent dosage, methylene blue (MB) concentration, adsorption time, solution pH, and temperature. Meanwhile, the adsorption kinetics and adsorption mechanism of PRT-1T and PRT-1Na on MB were investigated. The results showed that PRT-1Na exhibited better adsorption of MB due to its larger specific surface area, higher cation exchange capacity, and more abundant hydroxyl structure. Under the same adsorption conditions, the adsorption effect of PRT-1Na was four times that of PRT-1, and PRT-1T was twice that of PRT-1. At 20℃, a pH of 6, PRT-1Na dosage of 1.0 g, adsorption time of 2 h, 500 mL of MB, and an initial concentration of 500 mg·L-1, the MB removal rate was as high as 99.89%. In addition, there was both physical and chemical adsorption of PRT-1Na on MB dye wastewater, and the Elovich model fitted well for both PRT-1T and PRT-1Na adsorption of MB dye wastewater; however, the pseudo first-order kinetic model fitted best for PRT-1Na. |
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