化工进展 ›› 2023, Vol. 42 ›› Issue (12): 6631-6640.DOI: 10.16085/j.issn.1000-6613.2023-0201
• 资源与环境化工 • 上一篇
马丽然1(), 张彦平1(), 李芬2, 李一兵1, 马行迪1
收稿日期:
2023-02-16
修回日期:
2023-04-06
出版日期:
2023-12-25
发布日期:
2024-01-08
通讯作者:
张彦平
作者简介:
马丽然(1999—),女,硕士研究生,研究方向为污水处理。E-mail:1553182459@qq.com。
基金资助:
MA Liran1(), ZHANG Yanping1(), LI Fen2, LI Yibing1, MA Xingdi1
Received:
2023-02-16
Revised:
2023-04-06
Online:
2023-12-25
Published:
2024-01-08
Contact:
ZHANG Yanping
摘要:
以废弃生物质核桃壳为原料,KOH为改性剂,制备了石墨化生物质炭WSC600K-B,并通过SEM、TEM、BET、XRD、拉曼光谱等对材料进行了表征,考察了其吸附磺胺甲唑(SMX)的性能和机理。研究结果表明,经KOH活化后,WSC600K-B表面呈现排列整齐的石墨晶格条纹,对应ID/IG为1.037,石墨化程度较高;孔隙结构大大提高,呈蜂窝煤状,孔隙均匀分布,比表面积增大为733.64m2/g。室温下,pH=5时,0.25g/L WSC600K-B对50mg/L SMX的去除率可达94.28%,吸附容量为203.64mg/g。WSC600K-B对SMX的吸附过程受pH和共存离子影响,pH越高去除率越低,共存离子会抑制吸附过程。吸附过程符合二级动力学模型以及Freundlich等温模型,为多分子层化学吸附,反应存在孔径填充、π-π堆积、氢键作用、疏水作用和静电作用,吸附行为是自发进行的放热反应。
中图分类号:
马丽然, 张彦平, 李芬, 李一兵, 马行迪. 石墨化生物质炭对磺胺甲唑的吸附性能[J]. 化工进展, 2023, 42(12): 6631-6640.
MA Liran, ZHANG Yanping, LI Fen, LI Yibing, MA Xingdi. Adsorption performance of sulfamethoxazole by graphitized biochar[J]. Chemical Industry and Engineering Progress, 2023, 42(12): 6631-6640.
样品 | SBET/m2·g-1 | 孔径/nm | V/cm3·g-1 |
---|---|---|---|
WSC600K | 6.00 | 63.30 | 0.0032 |
WSC600K-B | 733.64 | 3.44 | 0.2158 |
表1 BET比表面积结果
样品 | SBET/m2·g-1 | 孔径/nm | V/cm3·g-1 |
---|---|---|---|
WSC600K | 6.00 | 63.30 | 0.0032 |
WSC600K-B | 733.64 | 3.44 | 0.2158 |
准一级动力学模型 | 准二级动力学模型 | Elovich模型 | ||||||
---|---|---|---|---|---|---|---|---|
qe | k1 | R2 | qe | k2 | R2 | a | b | R2 |
172.530 | 0.281 | 0.893 | 190.190 | 0.002 | 0.999 | 84.319 | 48.270 | 0.907 |
表2 动力学模型参数
准一级动力学模型 | 准二级动力学模型 | Elovich模型 | ||||||
---|---|---|---|---|---|---|---|---|
qe | k1 | R2 | qe | k2 | R2 | a | b | R2 |
172.530 | 0.281 | 0.893 | 190.190 | 0.002 | 0.999 | 84.319 | 48.270 | 0.907 |
吸附剂 | qe/mg·g-1 | 数据来源 |
---|---|---|
玉米芯 | 0.13 | 张艳杰等[ |
苜蓿生物炭 | 47.88 | 俞伟等[ |
功能化玉米芯生物炭 | 162.08 | 陈建等[ |
WSC600K-B | 203.64 | 本文 |
表3 不同吸附剂对SMX的最大吸附容量
吸附剂 | qe/mg·g-1 | 数据来源 |
---|---|---|
玉米芯 | 0.13 | 张艳杰等[ |
苜蓿生物炭 | 47.88 | 俞伟等[ |
功能化玉米芯生物炭 | 162.08 | 陈建等[ |
WSC600K-B | 203.64 | 本文 |
温度 /K | Langmuir模型 | Freundlich模型 | Temkin模型 | ||||||
---|---|---|---|---|---|---|---|---|---|
qm | KL | R2 | 1/n | KF | R2 | b | KT | R2 | |
298 | 434.7826 | 0.1027 | 0.9732 | 0.6364 | 45.6069 | 0.9925 | 80.7375 | 1.6110 | 0.9634 |
308 | 462.9630 | 0.0561 | 0.9654 | 0.7005 | 29.6150 | 0.9973 | 78.3554 | 1.0420 | 0.9362 |
318 | 546.4481 | 0.0284 | 0.9827 | 0.7776 | 18.3722 | 0.9978 | 82.3473 | 0.6037 | 0.9438 |
表4 吸附等温模型参数
温度 /K | Langmuir模型 | Freundlich模型 | Temkin模型 | ||||||
---|---|---|---|---|---|---|---|---|---|
qm | KL | R2 | 1/n | KF | R2 | b | KT | R2 | |
298 | 434.7826 | 0.1027 | 0.9732 | 0.6364 | 45.6069 | 0.9925 | 80.7375 | 1.6110 | 0.9634 |
308 | 462.9630 | 0.0561 | 0.9654 | 0.7005 | 29.6150 | 0.9973 | 78.3554 | 1.0420 | 0.9362 |
318 | 546.4481 | 0.0284 | 0.9827 | 0.7776 | 18.3722 | 0.9978 | 82.3473 | 0.6037 | 0.9438 |
温度/K | Kd/L·mg-1 | ∆G⊖/kJ·mol-1 | ∆H⊖/kJ·mol-1 | ∆S⊖/kJ·mol-1·K-1 |
---|---|---|---|---|
288 | 98.8278 | -11.3796 | -55.8180 | 0.1543 |
298 | 65.9616 | -9.8366 | ||
308 | 26.0278 | -8.2936 | ||
318 | 11.5779 | -6.7506 |
表5 吸附热力学参数
温度/K | Kd/L·mg-1 | ∆G⊖/kJ·mol-1 | ∆H⊖/kJ·mol-1 | ∆S⊖/kJ·mol-1·K-1 |
---|---|---|---|---|
288 | 98.8278 | -11.3796 | -55.8180 | 0.1543 |
298 | 65.9616 | -9.8366 | ||
308 | 26.0278 | -8.2936 | ||
318 | 11.5779 | -6.7506 |
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