甘蔗渣炭对废水中Cr(Ⅵ)的吸附
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摘要
以甘蔗渣为原料,在真空氛围下炭化,制得甘蔗渣炭。采用SEM、FTIR、BET等方法对炭化前后的甘蔗渣进行表征,研究了甘蔗渣炭对废水中Cr(Ⅵ)的吸附效果。结果显示,炭化前甘蔗渣孔结构较少,结构较平整;炭化后甘蔗渣出现大量孔隙,比表面积大大增加。甘蔗渣化学结构发生了变化,产生新的官能团,吸附效果大大提高。炭化甘蔗渣吸附废水中Cr(Ⅵ)的最佳工艺条件为:吸附温度25℃,初始废水p H=1,炭化后甘蔗渣加入量14 g/L,吸附时间120 min,转速120 r/min。在此条件下处理初始浓度50 mg/L的废水时,去除率达到94. 5%,最大吸附量4. 805 mg/g。Langmuir等温吸附模型、拟二级动力学方程能更好的反应吸附过程。
Sugarcane bagasse is used as raw material to carbonize bagasse in a vacuum atmosphere. The bagasse carbonized before and after carbonization was characterized by SEM,FTIR and BET. The adsorption effect of bagasse carbon on Cr( Ⅵ) in wastewater was studied. The results show that the pore structure of bagasse before charring is relatively small and the structure is relatively smooth. After coking,a large number of pores appear in the bagasse and the specific surface area increases greatly. And the carbonized bagasse chemical structure has changed,resulting in new functional groups,the adsorption effect is greatly enhanced. The optimum conditions for the adsorption of Cr( Ⅵ) in waste water were as follows:the adsorption temperature was 25 ℃,the initial wastewater p H was 1,the amount of bagasse was carbonized 14 g/L,the adsorption time was 120 min,120 r/min. When the wastewater with the initial concentration of 50 mg/L was treated under this condition,the removal rate reached 94. 5% and the maximum adsorption capacity was 4. 805 mg/g. The results show that the Langmuir isothermal adsorption model can better reflect the adsorption process. Adsorption kinetics results show that the adsorption process follows the pseudo-second-order kinetic equation.
Sugarcane bagasse is used as raw material to carbonize bagasse in a vacuum atmosphere. The bagasse carbonized before and after carbonization was characterized by SEM,FTIR and BET. The adsorption effect of bagasse carbon on Cr( Ⅵ) in wastewater was studied. The results show that the pore structure of bagasse before charring is relatively small and the structure is relatively smooth. After coking,a large number of pores appear in the bagasse and the specific surface area increases greatly. And the carbonized bagasse chemical structure has changed,resulting in new functional groups,the adsorption effect is greatly enhanced. The optimum conditions for the adsorption of Cr( Ⅵ) in waste water were as follows:the adsorption temperature was 25 ℃,the initial wastewater p H was 1,the amount of bagasse was carbonized 14 g/L,the adsorption time was 120 min,120 r/min. When the wastewater with the initial concentration of 50 mg/L was treated under this condition,the removal rate reached 94. 5% and the maximum adsorption capacity was 4. 805 mg/g. The results show that the Langmuir isothermal adsorption model can better reflect the adsorption process. Adsorption kinetics results show that the adsorption process follows the pseudo-second-order kinetic equation.
引文
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[19] Singha B,Das S K. Biosorption of Cr(VI)ions from aqueous solutions:Kinetics,equilibrium,thermodynamics and desorption studies[J]. Colloids and Surfaces B:Biointerfaces,2011,84(1):221-232.
[20]李江兵,夏明,丁纯梅,等.酸改性活性炭对废水中六价铬吸附效果的研究[J].环境与健康杂志,2013(1):69-71.
[21]鲁秀国,段建菊,黄林长,等.炭化核桃壳对废水中Cr(Ⅵ)的吸附[J].化工环保,2016(6):611-616.
[2]丁绍兰,常娥,齐建敏.废弃皮革制品屑对六价铬的吸附性能研究[J].中国皮革,2012(3):1-3.
[3]张庆乐,董建,张丽青,等.草酸改性杨树叶对六价铬的吸附性能[J].环境工程,2015(5):64-69.
[4] Park D,Lim S,Yun Y,et al. Reliable evidences that the removal mechanism of hexavalent chromium by natural biomaterials is adsorption-coupled reduction[J]. Chemosphere,2007,70(2):298-305.
[5] Muthusamy S,Venkatachalam S,Jeevamani P M K,et al.Biosorption of Cr(VI)and Zn(II)ions from aqueous solution onto the solid biodiesel waste residue:mechanistic,kinetic and thermodynamic studies[J]. Environmental Science and Pollution Research,2014,21(1):593-608.
[6] Singha B,Das S K. Biosorption of Cr(VI)ions from aqueous solutions:Kinetics,equilibrium,thermodynamics and desorption studies[J]. Colloids and Surfaces B:Biointerfaces,2011,84(1):221-232.
[7]何忠明,王琼,付宏渊,等.柚子皮吸附去除水中的六价铬和砷[J].环境工程,2016(S1):299-302.
[8]韦学玉,刘志刚,万耀强,等.磁性壳聚糖纳米材料对水中Cu(Ⅱ)吸附性能的研究[J].华东交通大学学报,2017(4):129-136.
[9]张明明.生物炭改性材料的制备及其对水体中六价铬的吸附机理研究[D].长沙:湖南大学,2016.
[10]张双杰,邢宝林,黄光许,等.核桃壳水热炭对六价铬的吸附特性[J].化工进展,2016(3):950-956.
[11]刘超,杨永哲,宛娜.铝污泥吸附六价铬的特征和机理[J].环境工程学报,2013(1):97-102.
[12]周晓倩,郭华明,赵凯.改性天然菱铁矿去除水中六价铬[J].环境工程学报,2015,9(9):4171-4177.
[13]谭秋荀,张可方,赵焱,等.活性氧化铝对六价铬的吸附研究[J].环境科学与技术,2012(6):130-133.
[14]郭方颖.改性磁性氧化石墨烯材料制备及其对水中六价铬离子的吸附机理研究[D]长沙:湖南大学,2016.
[15]刘中华,范传芳,张记市,等.啤酒糟及其生物炭吸附废水中Cr(Ⅵ)[J].齐鲁工业大学学报:自然科学版,2017(4):19-24.
[16] Kwak H W,Kim M K,Lee J Y,et al. Preparation of beadtype biosorbent from water-soluble Spirulina platensis extracts for chromium(VI)removal[J]. Algal Research,2015(7):92-99.
[17]黄增尉,周泽广.交联壳聚糖处理电镀废水中铬(Ⅵ)的研究[J].广西民族大学学报:自然科学版,2006,12(4):100-103.
[18] Gagrai M K,Das C,Golder A K. Reduction of Cr(VI)into Cr(III)by Spirulina dead biomass in aqueous solution:Kinetic studies[J]. Chemosphere,2013,93(7):1366-1371.
[19] Singha B,Das S K. Biosorption of Cr(VI)ions from aqueous solutions:Kinetics,equilibrium,thermodynamics and desorption studies[J]. Colloids and Surfaces B:Biointerfaces,2011,84(1):221-232.
[20]李江兵,夏明,丁纯梅,等.酸改性活性炭对废水中六价铬吸附效果的研究[J].环境与健康杂志,2013(1):69-71.
[21]鲁秀国,段建菊,黄林长,等.炭化核桃壳对废水中Cr(Ⅵ)的吸附[J].化工环保,2016(6):611-616.