Study on adsorption of paraquat by coconut shell activated carbon

doi:10.14088/j.cnki.issn0439-8114.2022.23.012

Abstract

Abstract: The influencing factors and mechanism of paraquat removal by coconut shell charcoal modified by nitric acid were studied by batch adsorption technology. The effects of pH, rotational speed, dosage, temperature and initial concentration of YK-6 were studied. From the kinetic data, 6 h was used as the equilibrium time to determine the adsorption isotherm test. The adsorption data were fitted to Langmuir, Freundlich, Temkin and Brouers-Sotolongo （BS） adsorption isotherm models. When the pH was 2~9, the adsorption increased with the increase of pH, which was the result of the increase of the affinity between paraquat molecules and acidic functional groups on the surface of coconut shell carbon. Through Arrhenius formula fitting calculation, it was found that the process had an obvious chemical adsorption effect. BS isotherm model describes the adsorption process, the maximum adsorption energy of BS model measured at 37 ℃ was 88.47 mg/g. The Lagergren quasi-first-order, Lagergren quasi-second-order, Elovich and Avrami models were used to fit the kinetic results, and it was found that the Avrami model was the most suitable.

Key words: paraquat, adsorption, isothermal lines, dynamic model

CLC Number:

O647.31

FAN Kai-xuan, LI Meng-zhi, XIE Shang-hong, FENG Xiao-yun, LI Tao, LIANG Zhen, BAO Ji-hai. Study on adsorption of paraquat by coconut shell activated carbon[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(23): 69-73.

References

[1] 王胜武,张灵敏,李俊荣. 百草枯中毒治疗方法的探讨[J]. 内科急危重症杂志,2003,9(4):206-207.
[2] 曹鈺,董玉龙,胡海,等. 钙稳态失衡在百草枯中毒肺损伤中的作用[J]. 四川医学,2005,26(7):741-743.
[3] 田英平,石汉文,佟飞,等. 百草枯中毒的规范治疗[J]. 中华急诊医学杂志,2007,16(5):559-560.
[4] 单艳华,张勇刚. 血液灌流治疗急性百草枯中毒23例临床观察[J]. 新乡医学院学报,2006(4):397-398.
[5] 毕思远. 百草枯检测新方法及百草枯在小鼠体内死后再分布和死后弥散研究[D].石家庄:河北医科大学,2013.
[6] 石磊,杨月红,宁平,等. CTMAB-磷石膏对Cr(Ⅵ)的吸附动力学研究[J]. 化学世界,2015,56(5):297-302.
[7] 刘丽娜,赵金,陈莉,等. 茶多酚对急性百草枯中毒大鼠治疗作用的实验研究[J]. 中华劳动卫生职业病杂志,2000,18(3):158-160.
[8] VINHAL J O,LAGE M R,CARNEIRO J W M, et al. Modeling, kinetic, and equilibrium characterization of paraquat adsorption onto polyurethane foam using the ion-pairing technique[J]. Journal of environmental management,2015,156:200-208.
[9] HO Y S, MCKAY G.Sorption of dye from aqueous solution by peat[J]. Chemical engineering journal,1998,70(2):115-124.
[10] 王涛,余贵芬,王芳,等. 线性和非线性方法估计单宁酸共存下形成的无定形铝氧化物上菲的吸附等温线参数比较[J].土壤化学,2010,42(2):280-287.
[11] NJOKU V O, ASIF M, HAMEED B H.1.2,4-Dichlorophenoxyacetic acid adsorption onto coconut shell-activated carbon: Isotherm and kinetic modeling[J].Desalination and water treatment,2015,55(1):132-141.
[12] BROUERS F, SOTOLONGO O, MARQUEZ F, et al.Microporous and heterogeneous surface adsorption isotherms arising from levy distributions, Physica A: Statistical[J].Mechanics and its applications,2004,349(1):271-282.
[13] SHAARANI F W, HAMEED B H.Batch adsorption of 2,4-dichlorophenol onto activated carbon derived from agricultural waste[J]. Desalination,2010,255(3):159-164.
[14] HALL K R, EAGLETON L C, ACRIVOS A,et al.Pore and solid-diffusion kinetics in fixed-bed adsorption under constant-pattern conditions[J].Industrial and engineering chemistry research fundamentals,1966,5(2):212-223.
[15] 房百惠,李士贺,王童,等. 改性矿物材料钝化污泥土地利用过程中重金属的淋溶特性[J]. 环境污染与防治,2021,43(8):962-967.
[16] 李祎,程宏达,韩常玉. P3HB4HB/OA生物可降解共混物非等温结晶研究[J]. 塑料科技,2021,49(3):60-65.
[17] LOPES E C N,ANJOS F S C D,VIEIRA E F S,et al.An alternative Avrami equation to evaluate kinetic parameters of the interaction of Hg(II) with thin chitosan membranes[J]. Colloid Interface Sci, 2003,263(2):542-547.