改性甘蔗渣吸附水中镉和铅的研究

发布时间：2018-09-12 11:35

【摘要】：本论文选用制糖工业副产物—甘蔗渣为原料,制备了系列化学改性甘蔗渣,筛选出两种对Pb2+有较好吸附效果的吸附剂—环氧氯丙烷改性甘蔗渣和KMnO4改性甘蔗渣,一种对Cd2+有较好吸附效果的吸附剂—环氧氯丙烷-浓硫酸改性甘蔗渣。考察了吸附剂投加量、初始pH值、吸附时间、Cd2+与Pb2+初始浓度等因素对改性甘蔗渣吸附模拟废水中Cd2+和Pb2+效果的影响,研究了改性甘蔗渣对Cd2+和Pb2+的吸附动力学和吸附等温线,并对吸附机理进行了初步探讨,得到以下研究结果:(1)环氧氯丙烷改性甘蔗渣吸附Pb2+(初始浓度为10 mg/L)的最佳条件为:pH=7,吸附时间为60 min;吸附动力学符合准二级动力学方程,吸附等温线符合Langmuir方程,对Pb2+的理论饱和吸附量为41.67 mg/g;采用0.1 mol/L H2SO4溶液对改性甘蔗渣进行解吸再生,循环使用三次后,对Pb2+的吸附量仍有38.03 mg/g;环氧氯丙烷改性甘蔗渣对Pb2+的吸附机理为配位反应。(2)KMnO4(0.5 mmol/L)改性甘蔗渣吸附Pb2+(初始浓度为10 mg/L)的最佳条件为:投加量为1.5 g/L,pH=5,吸附时间为10 min;吸附动力学符合准二级动力学方程,吸附等温线符合Langmuir方程,理论饱和吸附量为18.03 mg/g;KMnO4(0.5 mmol/L)改性甘蔗渣对Pb2+的吸附机理是配位反应。(3)KMnO4(30 mmol/L)改性甘蔗渣吸附Pb2+(初始浓度为50 mg/L)的最佳条件为:投加量为0.5 g/L,pH=5,吸附时间为60 min;吸附动力学符合准二级动力学方程,吸附等温线符合Langmuir方程,理论饱和吸附量为307.7 mg/g;KMnO4(30 mmol/L)改性甘蔗渣中δ-MnO2与Pb2+形成了内层络合物。(4)环氧氯丙烷-浓硫酸改性甘蔗渣吸附Cd2+(初始浓度为10 mg/L)的最佳条件为:投加量为1g/L,pH=6,吸附时间为60 min;吸附动力学符合准二级动力学方程,吸附等温线符合Langmuir方程,理论饱和吸附量为21.79 mg/g;环氧氯丙烷-浓硫酸改性甘蔗渣对Cd2+的吸附机理是配位反应。
[Abstract]:In this paper, a series of chemically modified bagasse were prepared by using bagasse, a by-product of sugar industry, as raw material. Two kinds of adsorbents, epoxy chloropropane modified bagasse and KMnO4 modified bagasse, were selected. A good adsorbent for Cd2-epichlorohydrin-concentrated sulfuric acid modified bagasse. The effects of adsorbent dosage, initial pH value, initial concentration of CD2 and Pb2 on the adsorption of Cd2 and Pb2 in modified bagasse wastewater were investigated. The adsorption kinetics and isotherm of modified bagasse to Cd2 and Pb2 were studied. The adsorption mechanism was preliminarily discussed. The following results were obtained: (1) the optimal conditions for adsorption of Pb2 (initial concentration 10 mg/L) by epichlorohydrin modified bagasse were as follows: (1) the adsorption kinetics of bagasse modified by epichlorohydrin (10 mg/L) was as follows: (1) the adsorption kinetics of bagasse modified by epichlorohydrin was in accordance with the quasi second-order kinetic equation at 60 min;. The adsorption isotherm accorded with Langmuir equation. The theoretical saturated adsorption capacity of Pb2 was 41.67 mg/g;. The modified bagasse was desorbed and regenerated by 0.1 mol/L H2SO4 solution. The adsorption mechanism of Pb2 on bagasse modified by epichlorohydrin 38.03 mg/g; is coordination reaction. (2) the optimum conditions of KMnO4 (0.5 mmol/L) modified bagasse to adsorb Pb2 (initial concentration is 10 mg/L) are as follows: the dosage is 1.5 g / L ~ (-1) pH ~ (-1), the adsorption time is 10 min;. The adsorption kinetics accords with the quasi-second-order kinetic equation. The adsorption isotherm accords with Langmuir equation. The adsorption mechanism of bagasse modified with 18. 03 mg/g;KMnO4 (0. 5 mmol/L) on Pb2 is coordination reaction. (3) the optimal conditions for the adsorption of Pb2 (initial concentration 50 mg/L) by KMnO4 (30 mmol/L) modified bagasse are as follows: the dosage of 0. 5 g / L pH 5, and the adsorption time of 60 min;. In accordance with the quasi-second-order kinetic equation, The adsorption isotherm accords with Langmuir equation. The theoretical saturated adsorption capacity of 307.7 mg/g;KMnO4 (30 mmol/L) modified bagasse was 307.7 mg/g;KMnO4 (30 mmol/L) 未 -MnO2 formed an inner complex with Pb2. (4) the optimal conditions for the adsorption of Cd2 (initial concentration 10 mg/L) by epichlorohydrin-concentrated sulfuric acid modified bagasse were as follows: dosage of 1 g / L ~ (-1) pH ~ (+) ~ (6), adsorption time. The adsorption kinetics of 60 min; accords with the quasi-second-order kinetic equation. The adsorption isotherm accords with Langmuir equation, and the adsorption mechanism of Cd2 on bagasse modified by epichlorohydrin and concentrated sulfuric acid is 21.79 mg/g;.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;O647.33

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