化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (2) : 173-178.

科学研究

改性核桃壳炭基吸附材料对Cu²⁺的吸附性能研究

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Removal of Cu²⁺ from aqueous solution using walnut shell-based activated carbon with pyrolusite modification

He Lizhi¹, Wang Meicheng¹, Yao Sicong¹, Zou Hongjing², Zuo Xiaoli², Chen Yao¹

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Received		Published
2018-09-19		2020-02-20
Issue Date	Revised Date
2020-03-02	2018-09-19

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摘要

利用核桃壳作为原料制备出普通核桃壳活性炭 (WS)和软锰矿改性核桃壳活性炭 (WS_Mn),探讨了WS_Mn中改性剂软锰矿的最佳添加量,并对2种活性炭进行了表面特性分析,研究了2种活性炭对溶液中Cu²⁺的吸附特性。结果表明:当软锰矿添加量为1% (质量分数)时,WS_Mn的孔隙结构更加发达,以微孔和中孔为主,比表面积为1433.13m²/g,总孔容为0.9083cm³/g,比表面积比未添加软锰矿的核桃壳活性炭提高了27.16%。室温下,当活性炭投加量为6g/L,Cu²⁺溶液质量浓度为200mg/L,溶液初始pH=4.3,吸附平衡时间为1h时,WS_Mn和WS对溶液中Cu²⁺的去除率分别为95.5%和73.67%。准二级动力学方程和Langmuir吸附等温方程能准确地描述2种活性炭对Cu²⁺的吸附过程。

Abstract

Unmodified (WS) and pyrolusite modified activated carbons (WS_Mn) were developed from walnut shell.The optimized addition of pyrolusite in the activated carbons production was also discussed.Analysis of surface characteristics and Cu²⁺ adsorption performance in the solution for both activated carbons were carried out.The BET surface area and pore volume of WS_Mn was up to 1433.13m²/g and 0.9083cm³/g,the BET surface area was 27.16% higher than WS's.Compared with WS,the pore structure of WS_Mn was more developed with mesopores and micropores.At room temperature,with the 200mg/L Cu²⁺,pH=4.3,6g/L adsorbent and 60min reaction,the maximum removal rate of Cu²⁺ could be 95.5% and 73.67% for WS_Mn and WS,respectively.For both activated carbons the adsorption kinetics was fitted well with the pseudo-second order model and the adsorption isotherm followed Langmuir model.

关键词

核桃壳 / 活性炭 / 改性 / 重金属离子吸附

Key words

walnut shell / activated carbon / modification / heavy metal ion-adsorption

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改性核桃壳炭基吸附材料对Cu²⁺的吸附性能研究[J]. 化工新型材料, 2020, 48(2): 173-178 DOI:

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