Page 204 - 《精细化工》2022年第1期

第 39 卷第 1 期 精 细 化 工 Vol.39, No.1
202 2 年 1 月 FINE CHEMICALS Jan. 2022

水处理技术与环境保护
铜渣基化学键合陶瓷材料吸附 Cr(Ⅵ)的性能及机理

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韦 宇，母维宏，罗中秋 ，周新涛
（昆明理工大学 化学工程学院，云南 昆明 650500）

摘要：以富含铁的铜渣（CS）为原料，在碱激发条件下制备了铜渣基化学键合陶瓷材料（CSCBC），将其用于
废水中 Cr(Ⅵ)的吸附。考察了吸附剂投加量、Cr(Ⅵ)初始质量浓度及溶液 pH 对 Cr(Ⅵ)吸附率的影响。通过吸附
动力学和热力学分析，结合吸附前后吸附材料结构表征，对其吸附机理进行了探讨。结果表明，当 Cr(Ⅵ)初始
质量浓度为 100 mg/L、pH=1、吸附剂投加量为 8 g/L 时，在 120 min 内达吸附平衡，Cr(Ⅵ)吸附率在 99%以上。
Langmuir 等温吸附模型计算所得最大理论吸附容量为 25.3 mg/g。与生物炭基铁氧化物复合材料、FeS 复合材料、
铁掺杂吸附剂等同类型吸附剂相比，CSCBC 对 Cr(Ⅵ)的吸附容量明显提高。CSCBC 对 Cr(Ⅵ)的吸附过程符合
准一级动力学模型和 Langmuir 等温吸附模型。其吸附机制主要是物理吸附和化学吸附同时作用的结果。6 次吸
附-解吸后，其吸附容量保持初次吸附容量的 75%以上。
关键词：铜渣；Cr(Ⅵ)；化学键合陶瓷；吸附；模型；水处理技术
中图分类号：X703 文献标识码：A 文章编号：1003-5214 (2022) 01-0194-10

Adsorption of Cr(Ⅵ) by copper slag based chemically bonded ceramics:

Property and mechanism

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WEI Yu, MU Weihong, LUO Zhongqiu , ZHOU Xintao
（Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China）

Abstract: Copper slag based chemically bonded ceramic material (CSCBC) was prepared from iron-rich
copper slag under alkali excitation, and was used to adsorb Cr(Ⅵ) in the waste water. The effects of
addition amount of adsorbent, initial mass concentration of Cr(Ⅵ) and pH of the solution on the adsorption rate
of Cr(Ⅵ) were investigated. The adsorption mechanism was discussed by the adsorption kinetics,
thermodynamics analysis and characterization of adsorbent before and after adsorption. The results showed
that the adsorption equilibrium could be reached within 120 min, the adsorption rate of Cr(Ⅵ) was up to
99% under the optimal conditions [adsorbent addition amount of 8 g/L, initial mass concentration of Cr(Ⅵ)
of 100 mg/L and pH=1]. The maximum theoretical adsorption capacity of 25.3 mg/g was obtained by
Langmuir isothermal adsorption model calculation. CSCBC had higher adsorption capacity of Cr(Ⅵ) than
the same type adsorbents such as biochar-based iron oxide composites, FeS composite and ion doped
adsorbent. The adsorption process of Cr(Ⅵ) by CSCBC was in accordance with the quasi-first order kinetic
model and Langmuir isotherm adsorption model. The adsorption mechanism could be explained from two
aspects of reduction and physical adsorption. The adsorption capacity remained more than 75% of the initial
adsorption capacity after 6 adsorption-desorption experiments.
Key words: copper slag; Cr(Ⅵ); chemically bonded ceramics; adsorption; model; water treatment technology

铬是工业废水中常见的有毒污染物，通常以 大于 Cr(Ⅲ)。此外，Cr(Ⅵ)迁移能力强、污染持续时
[1]
[2]
Cr(Ⅲ)和 Cr(Ⅵ)的形式存在 ，其中 Cr(Ⅵ)的毒性远 间久、易在人体内富集且难降解 ，对人体有致畸、

收稿日期：2021-07-18; 定用日期：2021-09-03; DOI: 10.13550/j.jxhg.20210734
基金项目：国家自然科学基金（21866018）；云南省万人计划“青年拔尖人才”
作者简介：韦 宇（1996—），男，硕士生，E-mail：13795920689@163.com。联系人：罗中秋（1987—），女，副教授，E-mail：
luozhongq@126.com；周新涛（1979—），男，教授，E-mail：zhouxt@kmust.edu.cn。