木醋液改性羟基磷灰石对溶液中Cd2+的吸附特性

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (1): 312-322.

所属专题：新型功能材料

木醋液改性羟基磷灰石对溶液中Cd²⁺的吸附特性

杨晨琛¹, 万亚珍¹, 梅丹丹², 张文辉¹, 张爽爽¹, 周灿¹

1.郑州大学化工学院,郑州 450000;
2.河南力浮科技有限公司,郑州 450000

收稿日期:2021-08-26 修订日期:2021-09-27 出版日期:2022-01-15 发布日期:2022-02-10
通信作者: 万亚珍,博士,教授。E-mail:1842169297@qq.com
作者简介:杨晨琛(1997—),女,硕士研究生。主要从事铅、镉污染农田土壤修复的研究。E-mail:915033798@qq.com
基金资助:
郑州市重大科技创新专项(2019CXZX0077)

Adsorption Characteristics of Cd²⁺ in Solution by Hydroxyapatite Modified with Wood Vinegar

YANG Chenchen¹, WAN Yazhen¹, MEI Dandan², ZHANG Wenhui¹, ZHANG Shuangshuang¹, ZHOU Can¹

1. School of Chemical Engineering, Zhengzhou University, Zhengzhou 450000, China;
2. Henan Lifu Technology Limited Company, Zhengzhou 450000, China

Received:2021-08-26 Revised:2021-09-27 Online:2022-01-15 Published:2022-02-10

摘要/Abstract

摘要： 水体中存在Cd²⁺会危害人体健康,Cd²⁺污染的去除是一个需要解决的问题。以羟基磷灰石(HAP)和低成本的木醋液(WV)为原料,通过水浴搅拌制备了木醋液改性羟基磷灰石(WV-HAP),并将其应用于去除溶液中Cd²⁺的研究。利用XRD、FT-IR、SEM、BET对WV-HAP进行了表征,通过吸附试验探究溶液初始pH、初始离子浓度、接触时间和温度对WV-HAP对Cd²⁺吸附特性的影响。结果表明:在吸附剂添加量2 g/L、温度298 K、Cd²⁺初始浓度100 mg/L、pH=5、吸附时间4 h时,WV-HAP的平衡吸附容量为46.43 mg/g;WV-HAP对Cd²⁺的吸附过程符合Langmuir等温吸附模型和准二级动力学模型;热力学研究表明吸附过程是吸热的;通过对吸附Cd²⁺前后的WV-HAP进行表征,发现吸附机制主要是表面吸附、孔道吸附和离子交换。WV-HAP表现出优于HAP的对溶液中Cd²⁺的吸附能力,是一种潜在的Cd²⁺吸附材料。

关键词: 羟基磷灰石, 木醋液, 木醋液改性羟基磷灰石, 吸附, Cd²⁺污染, 水处理, 离子交换

Abstract: The presence of Cd²⁺ in water endangers human health, and the removal of Cd²⁺ pollution is a problem that needs to be solved. Wood vinegar modified hydroxyapatite (WV-HAP) was prepared by water bath stirring with hydroxyapatite (HAP) and low cost wood vinegar (WV), and it was used to remove Cd²⁺ from solution. WV-HAP was characterized by XRD, FT-IR, SEM and BET. The effects of initial pH, initial ion concentration, contact time and temperature on the adsorption characteristics of WV-HAP were investigated through adsorption experiments. The results show that the equilibrium adsorption capacity of WV-HAP is 46.43 mg/g under the conditions of adsorbent dosage of 2 g/L, temperature 298 K, initial concentration of Cd²⁺100 mg/L, pH=5 and adsorption time 4 h. The adsorption process of Cd²⁺ by WV-HAP conform to Langmuir isothermal adsorption model and quasi-second-order kinetic model. Thermodynamic study shows that the adsorption process is endothermic. Through the characterization of WV-HAP before and after Cd²⁺ adsorption, it is found that the adsorption mechanisms are mainly surface adsorption, pore adsorption and ion exchange. The adsorption capacity of WV-HAP to Cd²⁺ in solution is better than that of HAP, and WV-HAP is a potential Cd²⁺ adsorption material.

Key words: hydroxyapatite, wood vinegar, wood vinegar modified hydroxyapatite, adsorption, Cd²⁺ pollution, water treatment, ion exchange

中图分类号:

X523

杨晨琛, 万亚珍, 梅丹丹, 张文辉, 张爽爽, 周灿. 木醋液改性羟基磷灰石对溶液中Cd²⁺的吸附特性[J]. 硅酸盐通报, 2022, 41(1): 312-322.

YANG Chenchen, WAN Yazhen, MEI Dandan, ZHANG Wenhui, ZHANG Shuangshuang, ZHOU Can. Adsorption Characteristics of Cd²⁺ in Solution by Hydroxyapatite Modified with Wood Vinegar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(1): 312-322.

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木醋液改性羟基磷灰石对溶液中Cd²⁺的吸附特性

Adsorption Characteristics of Cd²⁺ in Solution by Hydroxyapatite Modified with Wood Vinegar

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