KOH活化法制备棉秆基活性炭及其对含苯酚废水的吸附

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英文篇名：Preparation of Cotton Stalk Based Activated Carbon by KOH Activation and Its Adsorption Capacity for Phenol Wastewater 作者：谭文英 ; 程晓红 ; 李硕 ; 杨宇翔 英文作者：TAN Wenying;CHENG Xiaohong;LI Shuo;YANG Yuxiang;Material Science and Engineering College,Northeast Forestry University; 关键词：棉秆 ; 活性炭 ; 苯酚 ; 吸附 英文关键词：cotton stalk;;activated carbon;;phenol;;adsorb 中文刊名：生物质化学工程 英文刊名：Biomass Chemical Engineering 机构：东北林业大学材料科学与工程学院; 出版日期：2019-03-30 出版单位：生物质化学工程 年：2019 期：02 基金：南京领军型科技创业人才引进计划资助(1007012) 语种：中文; 页：17-22 页数：6 CN：32-1768/S ISSN：1673-5854 分类号：X703;TQ424.1

摘要

以农业废弃物棉秆为原料,采用氢氧化钾活化法制备活性炭,并用于吸附含苯酚废水中的苯酚。棉秆基活性炭的最佳制备条件为棉秆先炭化,以KOH溶液为活化剂,KOH与棉秆炭的质量比(物料比)1.5∶1,活化温度800℃、活化时间70 min,此条件下制备的棉秆活性炭亚甲基蓝的吸附值为342.33 mg/g,碘吸附值为1 368.65 mg/g,其BET比表面积达到了1 735.94 m~2/g,总孔容积0.36 cm~3/g,平均孔径2.33 nm。将此活性炭用于吸附苯酚,苯酚质量浓度60 mg/L的50 mL废水中,当pH值为7,吸附时间2 h,活性炭投放量为50 mg时,苯酚去除率最高可达98%。对此吸附过程进行动力学分析,结果表明准二级动力学模型能很好的描述此活性炭吸附苯酚的过程。
        The activated carbon, which was obtained with agricultural waste cotton stalk as raw material, was prepared by the activation of potassium hydroxide and used to adsorb phenol wastewater. The optimum preparation conditions for cotton stalk based activated carbon were carbonized cotton stalk, KOH as activator, mass ratio of KOH and carbonized cotton stalk(material ratio) 1.5∶1, activation temperature 800 ℃, activation time 70 min. Under these conditions, the adsorption value of methylene blue was 342.33 mg/g, and the iodine adsorption value was 1 368.65 mg/g. The BET specific surface area was 1 735.94 m~2/g, the total pore volume was 0.36 cm~3/g, and the average pore size was 2.33 nm. The activated carbon was used to adsorb phenol wastewater. When the amount of activated carbon was 50 mg, the mass concentration of phenol was 60 mg/L, the volume of wasterwater was 50 mL, the pH value was 7 and the adsorption time was 2 h, the removal rate of phenol was up to 98%. The kinetic analysis of the adsorption process showed that the pseudo-second-order kinetic model could better describe the process of the activated carbon adsorption of phenol.

引文

[1]郭冬生,黄春红.近10年来中国农作物秸秆资源量的时空分布与利用模式[J].西南农业学报,2016,29(4):948-954.
    [2]李海亮,汪春,孙海天,等.农作物秸秆的综合利用与可持续发展[J].农机化研究,2017(8):256-262.
    [3]IOANNIDOU O A,ZABANIOTOU A A,STAVROPOULOS G G,et al.Preparation of activated carbons from agricultural residues for pesticide adsorption[J].Chemosphere,2010,80(11):1328-1336.
    [4]ISLAM M S,ROUF M A.Waste biomass as sources for activated carbon production:A review[J].Bangladesh Journal of Scientific and Industrial Research,2013,47(4):347-364.
    [5]娄梅生.生物质炭活性炭的制备及其对苯酚废水吸附的研究[D].合肥:合肥工业大学,2013.
    [6]耿莉莉,兰海瑞,张宏喜.新疆棉秆基活性炭对苯酚吸附性能的研究[J].山东化工,2016,45(20):182-185.
    [7]TZVETKOV G,MIHAYLOVA S,STOITCHKOVA K,et al.Mechanochemical and chemical activation of lignocellulosic material to prepare powdered activated carbons for adsorption applications[J].Powder Technology,2016,299:41-50.
    [8]周丕严.H3PO4、KOH活化法桐壳基活性炭的制备及其吸附性能的研究[D].福建:福建师范学院,2007.
    [9]ABDEL-GHANI N T,EL-CHAGHABY G A,ELGAMMAL M H,et al.Optimizing the preparation conditions of activated carbons from olive cake using KOH activation[J].New Carbon Materials,2016,31(5):492-500.
    [10]NGUYEN T D,MOON J I,SONG J H,et al.Synthesis of activated carbon from rice husk using microwave heating induced KOH activation[J].Korean Journal of Materials Research,2012,22(6):321-327.
    [11]国家质量技术监督局.GB/T 12496.8—2015木质活性炭试验方法碘吸附值的测定[S].北京:中国标准出版社,2015:5.
    [12]国家质量技术监督局.GB/T 12496.10—1999木质活性炭试验方法亚甲基蓝吸附值的测定[S].北京:中国标准出版社,2000:3.
    [13]国家质量技术监督局.GB/T 12496.3—1999木质活性炭试验方法灰分含量的测定[S].北京:中国标准出版社,2000:1.
    [14]冉秀芝,许俊强,王敏,等.油茶饼粕活性炭的制备及其对苯酚的吸附动力学研究[J].西南大学学报:自然科学版,2014,36(5):20-27.
    [15]国家质量技术监督局.GB/T 13803.4—1999针剂用活性炭[S].北京:中国标准出版社,2000:4.
    [16]国家质量技术监督局.GB/T 13803.3—1999糖液脱色用活性炭[S].北京:中国标准出版社,2000:2.