H_3PO_4-微波改性松树锯末热解炭及其对典型有机污染物的吸附研究
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摘要
本文以废弃松树锯末热解炭(PyC)为原料,用磷酸浸泡-微波辐射的方法对其改性。其最佳改性条件是：磷酸质量分数50%,浸渍比(固液比)1∶5,微波功率380W,微波时间2min。经过改性,热解炭的吸附性能大大提高。采用SEM、比表面积测定、官能团测定、等电点测定、FTIR、 XRD、 XRF、元素分析、差热分析等对改性和未改性的热解炭进行表征,结果表明,改性之后热解炭的孔结构更为疏松,表面积大大增加,其表面发生了很大的变化。
以改性锯末热解炭(APC)为吸附剂,对氯苯酚(p-CP)、4-氯-2,5-二甲氧基硝基苯(CDNP)和对硝基苯酚(p-NP)为吸附质,研究了APC对吸附质的单组分静态吸附实验,吸附饱和活性炭的再生和APC对p-CP和p-NP的竞争吸附实验,对实验结果进行等温吸附模型和动力学模型拟合及热力学研究。静态实验考查的因素有：吸附剂用量、pH、盐浓度、平衡时间、初始浓度和温度。实验结果如下：
(1)APC对p-CP的吸附中,溶液最佳pH是2 (2)APO对CDNP的吸附中,溶液最佳pH是2 (3)APC对p-NP的吸附中,溶液最佳pH是6 (4)在p-CP和p-NP的竞争吸附中,APC优先吸附p-NP,在p-NP吸附达到平衡后,APC对p-CP的吸附也达到平衡。APC对混合溶液中某一组分的吸附量小于对其单组分体系的吸附量,APC对p-CP的吸附受竞争吸附的影响更大。
In this research, H3PO4-microwave method was used to modify the pine sawdust pyrolytic char(PyC). The best condition of modification was discussed.The percent of H3PO4concentration was50%, soaking ratio (solid-liquid ratio) for1:5, microwave power for380W, microwave time for2min. After modification, the adsorption performance of pyrolytic char was greatly improved. The characterization of PyC and modified PyC (APC) was analyzed by element analysis, BET, FTIR, XRF, SEM, XRD and Boehm titration. The results Indicated that the pore structure of APC was more loose, the surface area was increased, the surface structure of APC was changed greatly.
The research used APC as adsorbent, for removal parachlorophenol (ρ-CP),4-chlorine-2,5-dimethoxy nitrobenzene(CDNP) and paranitrophenol(ρ-NP) in a single system. The reuse of APC and competitive adsorption between ρ-CP and ρ-NP on APC were studied. The influence factors of adsorption conditions, such as adsorbent dosage, pH, contact time, salt concentration, initial concentration and temperature were investigated. The experimental results were as follows:
(1) In the adsorption of ρ-CP on APC, best solution pH was2 (2) In the adsorption of CDNP on APC, best solution pH was2 (3) In the adsorption of ρ-NP on APC, best solution pH was6 (4) In competitive adsorption between ρ-CP and ρ-NP, APC adsorbed p-NP preferentially, after the adsorption equilibrium of ρ-NP on APC, the adsorption of ρ-CP on APC became equilibrium.The adsorption quantity of a component in mixture is less than that in single component system. The adsorption of ρ-CP on APC is affected greater by competitive adsorption.
以改性锯末热解炭(APC)为吸附剂,对氯苯酚(p-CP)、4-氯-2,5-二甲氧基硝基苯(CDNP)和对硝基苯酚(p-NP)为吸附质,研究了APC对吸附质的单组分静态吸附实验,吸附饱和活性炭的再生和APC对p-CP和p-NP的竞争吸附实验,对实验结果进行等温吸附模型和动力学模型拟合及热力学研究。静态实验考查的因素有：吸附剂用量、pH、盐浓度、平衡时间、初始浓度和温度。实验结果如下：
(1)APC对p-CP的吸附中,溶液最佳pH是2
In this research, H3PO4-microwave method was used to modify the pine sawdust pyrolytic char(PyC). The best condition of modification was discussed.The percent of H3PO4concentration was50%, soaking ratio (solid-liquid ratio) for1:5, microwave power for380W, microwave time for2min. After modification, the adsorption performance of pyrolytic char was greatly improved. The characterization of PyC and modified PyC (APC) was analyzed by element analysis, BET, FTIR, XRF, SEM, XRD and Boehm titration. The results Indicated that the pore structure of APC was more loose, the surface area was increased, the surface structure of APC was changed greatly.
The research used APC as adsorbent, for removal parachlorophenol (ρ-CP),4-chlorine-2,5-dimethoxy nitrobenzene(CDNP) and paranitrophenol(ρ-NP) in a single system. The reuse of APC and competitive adsorption between ρ-CP and ρ-NP on APC were studied. The influence factors of adsorption conditions, such as adsorbent dosage, pH, contact time, salt concentration, initial concentration and temperature were investigated. The experimental results were as follows:
(1) In the adsorption of ρ-CP on APC, best solution pH was2
引文
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