Characteristics of Enteromorpha prolifera Biochars and Their Adsorption Performance and Mechanisms for Cr(VI)

被引：7
作者：
Chen Y.-Y. [1 ,2 ]
Hui H.-X. [1 ]
Lu S. [1 ]
Wang B.-Y. [1 ]
Wang Z.-J. [1 ]
Wang N. [1 ]
机构：
[1] College of Environmental Science and Engineering, Ocean University of China, Qingdao
[2] Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao
来源：
Huanjing Kexue/Environmental Science | 2017年 / 38卷 / 09期
关键词：
Adsorption; Biochar; Cr(VI); Enteromorpha prolifera; Mechanism;
D O I：
10.13227/j.hjkx.201701041
中图分类号：
学科分类号：
摘要：
This study aims to understand the recycling process of Enteromorpha prolifera by using the slow pyrolysis technology to prepare biochars under different temperatures and by characterizing the physicochemical properties of biochars. The results showed that a relatively high level pyrolysis of Enteromorpha prolifera could be reached when the temperature was up to 400℃. The yield rate and the ash content of biochars were negatively correlated with the pyrolysis temperature, while the carbon content was positively correlated. The specific surface area of Enteromorpha prolifera biochars was in the range of 44.54-317.82 m2·g-1. The biochar surface was in the shape of a honeycomb and rich in oxygen-containing functional groups, such as hydroxyl (-OH) and carboxyl (-COOH) groups. The adsorption experiments revealed that the adsorption of Cr(VI) onto Enteromorpha prolifera biochars followed the pseudo-second-order kinetics equation and Langmuir isotherm, indicating that the adsorption process was controlled by the fast reaction process and governed by monomolecular and chemical adsorption. The optimal pH for Cr(VI) adsorption onto Enteromorpha prolifera biochars was 2 and their adsorption capabilities were in the order of BC400>BC700>BC600>BC500>BC300 (the adsorption capacity of BC400 was 4.79 mg·g-1). The adsorption mechanism included the electrostatic interactions between biochar and anions (HCrO4- and Cr2O72-) and the complexation of oxygen-containing functional groups. © 2017, Science Press. All right reserved.
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页码：3953 / 3961
页数：8
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