以一种水生植物凤眼莲为原料,利用浸渍-焙烧一步制备了一种氧化镁/生物炭复合材料(MgO-WBC),通过正交选出最优工艺条件进行制备和表征,吸附实验考察了氨氮初始浓度、反应时间和反应温度对吸附过程的影响。结果表明:最佳制备工艺为氯化镁投加量0.015mol/g,固液比30:1,焙烧温度600℃,焙烧时间1.5h。MgO负载到复合材料表面。MgO-WBC对氨氮的吸附过程符合伪二阶动力学方程,Freundlich模型对吸附行为的拟合更好,25℃时对低浓度氨氮溶液的吸附量可达6.68mg/g。通过热力学数据可知吸附过程吸热,可自发进行。
Using water hyacinth as raw material,a magnesia/biochar material (MgO-WBC) was prepared by impregnation-pyrolysis one-step method.The optimum process conditions were selected by orthogonal design for preparation and characterization of the materials.The effects of initial concentration of ammonia nitrogen,reaction time and temperature on the adsorption process were discovered by adsorption experiment.The results showed that the optimum preparation process was obtained at magnesium chloride concentration of 0.015mol/g,solid-liquid ratio of 30:1,calcination temperature of 600℃ and calcination time of 1.5h.MgO successfully loaded onto composite surface.The adsorption process of ammonia nitrogen by MgO-WBC accorded with pseudo second order kinetics model.Freundlich model fitted the adsorption behavior better,and the adsorption capacity of low concentration ammonia-nitrogen solution at 25℃ was 6.68mg/g.The thermodynamic data revealed that the adsorption process was endothermic and could be carried out spontaneously.
[1] 蒋春燕,石凤丽,李英杰,等.生物炭制备及其在水污染控制中的应用[J].化工新型材料,2019,47(5):235-239.
[2] Medyńska-Juraszek Agnieszka.Biochar as a soil amendment[J].Soil Science Annual,2016,67(3):100053178.
[3] Woolf D,Amonette J E,Street-Perrott F A,et al.Sustainable biochar to mitigate global climate change[J].Nature Communications,2010,1(1):56.
[4] Yin Qianqian,Liu Mengtian,Li Yonghua,et al.Computational study of phosphate adsorption on Mg/Ca modified biochar structure in aqueous solution[J].Chemosphere,2020,269:129374.
[5] 鲍磊,白永辉,李凡.生物质炭材料的制备及应用研究进展[J].化工新型材料,2019,47(7):54-59.
[6] 孙静儒,费晓雯,曹广添.水葫芦资源化利用前景及其研究进展[J].黑龙江畜牧兽医,2017(15):88-90.
[7] Fang Ci,Zhang Tao,Li Ping,et al.Application of magnesium modified corn biochar for phosphorus removal and recovery from swine wastewater[J].International Journal of Environmental Research and Public Health,2014,11(9):9217-9237.
[8] Patel Seema.Threats,management and envisaged utilizations of aquatic weed Eichhornia crassipes:an overview[J].Reviews in Environmental Science and Bio/Technology,2012,11(3):249-259.
[9] 王芳.磁性活性炭的制备及其氨氮吸附机理[J].化工新型材料,2018,46(6):210-213,217.
[10] 马升峰,许延辉,郭文亮,等.氯化镁焙烧分解磷酸镧的反应机制研究[J].稀有金属,2021,45(8):980-988.
[11] 范友华,喻宁华,邓腊云,等.氧化镁负载的油茶壳基生物炭的制备及其吸附镉性能研究[J].湖南林业科技,2019,46(3):1-8.
[12] 许珊珊,林存旺,丁亚磊,等.MgO/活性炭催化臭氧化降解有机物的作用机制[J].环境科学,2018,39(2):838-843.
[13] 孟庆瑞,崔心红,朱义,等.载氧化镁水生植物生物炭的特性表征及对水中磷的吸附[J].环境科学学报,2017,37(8):2960-2967.
[14] Uchimiya Minori,Lima Isabel M,Klasson K T,et al.Immobilization of heavy metal ions (CuⅡ,CdⅡ,NⅡI,and PbⅡ) by broiler litter-derived biochars in water and soil[J].Journal of Agricultural and Food Chemistry,2010,58(9):5538-5544.
[15] Keiluweit Marco,Nico Peter S,Johnson Mark G,et al.Dynamic molecular structure of plant biomass-derived black carbon (biochar)[J].Environmental Science & Technology,2010,44(4):1247-1253.
[16] 张康,吴小清,张华,等.磁性水葫芦生物炭对废水中六价铬的吸附性能[J].桂林理工大学学报,2020,40(1):193-200.
[17] Li Ronghua,Wang Jim J,Zhou Baoyue,et al.Recovery of phosphate from aqueous solution by magnesium oxide decorated magnetic biochar and its potential as phosphate-based fertilizer substitute[J].Bioresource Technology,2016,215:209-214.
[18] Yang Qi,Wang Xiaolin,Luo Wei,et al.Effectiveness and mechanisms of phosphate adsorption on iron-modified biochars derived from waste activated sludge[J].Bioresource Technology,2018,247:537-544.
[19] 王光泽,曾薇,李帅帅.铈改性水葫芦生物炭对磷酸盐的吸附特性[J].环境科学,2021,42(10):4815-4825.
[20] 杭嘉祥,李法云,梁晶,等.镁改性芦苇生物炭对水环境中磷酸盐的吸附特性[J].生态环境学报,2020,29(6):1235-1244.
[21] Salman Sami D,Rasheed Israa M,Mohammed Alaa K.Adsorption of heavy metal ions using activated carbon derived from Eichhornia (water hyacinth)[J].IOP Conference Series:Earth and Environmental Science,2021,779(1):012074.
[22] 李安玉,李双莉,余碧戈,等.镁浸渍生物炭吸附氨氮和磷:制备优化和吸附机理[J].化工学报,2020,71(4):1683-1695.
基金资助
国家自然科学基金(21507060);江苏省研究生实践创新计划(SJCX22-0449);国家级大学生创新创业训练计划项目(202110291085Z)
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