Modified oyster shell material and its PCBs adsorption characteristics

doi:10.16085/j.issn.1000-6613.2017.05.030

Abstract

Abstract: With ferrous sulfate as the source of iron,the nano iron modified oyster shell material was prepared by the in-situ potassium borohydride reduction. The microstructure of the modified oyster shell material was characterized and its persistent organic adsorption performance of polychlorinated biphenyl (PCBs) was discussed. The experimental results showed that the particle size of nano iron in the modified oyster shell was uniform and had high degree of dispersion;the modified oyster shell material had excellent PCBs wastewater treatment performance. The PCBs adsorption rates of the modified oyster shell material could reach 96% and the adsorption amount is 2.97mg/g at the suitable reaction conditions:the solution temperature of 25℃,the initial PCBs concentration of 5mg/L,and the reaction time of 180min. These results clearly indicated that the modified material had good industrial application prospect as a low-cost and efficient adsorbent for treatment of persistent organic wastewater. Adsorption isotherm researches showed that the equilibrium data were found to follow the Langmuir adsorption isotherm closely. The adsorption was easy to implementand the increment of temperature was helpful to the adsorption. Analyzing from the point of the adsorption kinetics,the adsorption process conforms to pseudo-second-order equation (R²>0.99) ;the chemical adsorption was the main process; the adsorption rate was controlled by both the external diffusion and internal diffusion.

Key words: oyster shell, modified material, PCBs, adsorption, kinetics

摘要： 以硫酸亚铁为铁源，通过硼氢化钾原位还原-负载制得纳米铁改性牡蛎壳材料，并对其微观结构进行表征，探讨改性后的牡蛎壳材料对持久性有机物多氯联苯（PCBs）的吸附性能。实验结果表明：改性牡蛎壳材料中纳米铁颗粒粒径均匀且分散度较高，改性后的牡蛎壳材料具有很好的PCBs废水处理能力；当处理时间为180min，溶液温度和初始PCBs浓度分别为25℃和5mg/L时，改性材料对PCBs的吸附率达96%，吸附量为2.97mg/g。改性材料可作为一种廉价、高效的持久性有机废水吸附剂，具有很好的工业应用前景。吸附等温线研究表明，Langmuir方程能较好地描述改性材料的PCBs吸附行为，吸附较容易，升高温度有利于吸附；从吸附动力学角度分析，吸附过程符合准二级动力学模型（R²>0.99），以化学吸附为主，吸附速率由表面扩散与颗粒内扩散联合控制。

关键词: 牡蛎壳, 改性材料, 多氯联苯, 吸附, 动力学

CLC Number:

X703.1

FAN Liwei, ZHOU Hua, LU Zexiang, XIONG Lifeng, HAI Reti. Modified oyster shell material and its PCBs adsorption characteristics[J]. Chemical Industry and Engineering Progress, 2017, 36(05): 1802-1810.

范立维, 周华, 卢泽湘, 熊丽凤, 海热提. 牡蛎壳改性材料及其吸附多氯联苯的性能[J]. 化工进展, 2017, 36(05): 1802-1810.

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