钴锌铁氧体改性生物炭对水中结晶紫的吸附性能研究  

Adsorption Performance of Crystal Violet in Aqueous Phase by Cobalt Zinc Ferrite Modified Biochar

作　　者：李易 郑芝佳[2,3] 张梦霏 袁喜 黄应平 田海林[3] 唐次来[2,3] LI Yi;ZHENG Zhi-jia;ZHANG Meng-fei;YUAN Xi;HUANG Ying-ping;TIAN Hai-lin;TANG Ci-lai(College of Biological and Pharmaceutical Sciences,China Three Gorges University,Yichang 443002,Hubei Province,China;College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei Province,China;Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang 443002,Hubei Province,China)

机构地区：[1]三峡大学生物与制药学院,湖北宜昌443002 [2]三峡大学水利与环境学院,湖北宜昌443002 [3]三峡库区生态环境教育部工程研究中心(三峡大学),湖北宜昌443002

出　　处：《中国农村水利水电》2024年第7期78-84,94,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(21972073,22206108)。

摘　　要：染料在生产和生活中广泛使用,导致环境中染料污染问题频发,尤其是水体,对生态系统和人体健康带来潜在危害。生物炭具有来源广泛且符合“双碳”的要求,被广泛用于环境污染治理。但由于原始生物炭的吸附能力差,且缺乏选择性。因此,对生物炭改性是最常用的方法。为了提高生物炭对染料结晶紫(CV)的吸附效果,研究以橙子皮为原料,通过共沉淀-热解法制备钴锌铁氧体改性的磁性生物炭(Co_(0.5)Zn_(0.5)Fe_(2)O_(4)@BC)。采用X射线衍射(XRD)、电子扫描显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、比表面积及孔径分析仪(BET)、Zeta电位仪对改性前后的生物炭进行详细表征。实验结果表明,改性后产生介孔结构,显著增加了材料的比表面积,而且增加了材料的表面正电荷,提高材料的pH适应性,从而促进生物炭对CV的吸附效果。通过批处理实验考察不同实验条件对Co_(0.5)Zn_(0.5)Fe_(2)O_(4)@BC吸附CV的影响,并对吸附动力学和吸附等温线进行拟合,发现Co_(0.5)Zn_(0.5)Fe_(2)O_(4)@BC对CV的吸附性能显著提高,去除率可达到99.64%,相较于单独的BC(41.94%)和Co0.5Zn0.5Fe2O4(26.78%)吸附能力显著增强。一级动力学和Langmuir模型更好地拟合吸附过程和吸附等温线。吸附过程是单层吸附,以物理吸附为主,最大吸附量为227.59 mg/g。Co_(0.5)Zn_(0.5)Fe_(2)O_(4)@BC在pH 5~11都能有效地吸附CV。常见的共存阴阳离子稍微促进Co_(0.5)Zn_(0.5)Fe_(2)O_(4)@BC对CV的吸附。在自来水和长江水中,吸附效果比纯水中好。这说明该材料具有很好的抗干扰能力。经过5次循环后对CV的去除率仍能达到69.75%。研究为CV污染水体的处理提供一种潜在材料,也为生物炭改性对染料废水的吸附提供一种新思路。Dyes are widely used in production and daily life,leading to frequent dye pollution in the environment,especially in water bod⁃ies,which poses potential risks to ecosystem and human health.Biochar has a wide range of sources and meets the requirements of“dual car⁃bon”,and is widely used in environmental pollution control.However,due to its poor adsorption capacity and lack of selectivity,modifica⁃tion is the most commonly used method to improve its sorption capacity.In order to improve the adsorption of crystal violet(CV)by biochar,magnetic biochar modified with cobalt-zinc ferrite(Co_(0.5)Zn_(0.5)Fe_(2)O_(4)@BC)was prepared from orange peel by coprecipitation-pyrolysis method.X-ray diffraction(XRD),scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FT-IR),specific surface area and pore size analyzer(BET)and Zeta potentiometer were used to characterize the biochar before and after modification.The experimental results showed that Co_(0.5)Zn_(0.5)Fe_(2)O_(4)@BC produced mesoporous structure,which significantly increased the specific surface area of the materi⁃al.Moreover,the surface positive charge of the material is increased,and the pH adaptability of the material is improved.Thus,it promoted the adsorption of CV by biochar.The effects of different experimental conditions on the adsorption of CV by modified biochar were investigat⁃ed through batch experiments.The adsorption kinetics and isotherm were fitted using different models.It was found that the adsorption capaci⁃ty of Co_(0.5)Zn_(0.5)Fe_(2)O_(4)@BC for CV was significantly improved,and the removal rate reached 99.64%,which was significantly improved com⁃pared with the raw biochar(41.94%)and Co0.5Zn0.5Fe2O4(26.78%).The first-order kinetics and Langmuir model better fit the adsorption process and adsorption isotherm.The adsorption process was monolayer adsorption,mainly physical adsorption,and the maximum adsorp⁃tion capacity was 227.59 mg/g.The modified biochar could effectively adsorb CV at pH 5~11.Common co-exis

关 键 词：生物炭 钴锌铁氧体 结晶紫 吸附动力学 

分 类 号：X703[环境科学与工程—环境工程]