秸秆掺杂与煅烧改性沸石吸附铜锌离子的特性
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摘要
为增强天然沸石去除重金属离子污染的能力,采用掺杂秸秆和高温煅烧对其进行改性,研究其对Cu~(2+)和Zn~(2+)静态吸附和动态吸附性能。结果表明,改性沸石对Cu~(2+)和Zn~(2+)的吸附等温线符合Langmuir方程,理论饱和吸附容量分别为4 043 mg Cu/kg和4 087 mg Zn/kg。吸附动力学曲线可采用Lagergren准二级动力学方程来描述。吸附热力学参数吸附自由能变ΔG <0、吸附焓变ΔH> 0、吸附熵变ΔS> 0,吸附势E <8 k J/mol。改性沸石对Cu~(2+)和Zn~(2+)吸附过程为以物理吸附为主的自发、吸热过程。
Zeolite was modified with the doped wheat straw and calcinations in order to reinforce the capacity to remove heavy metals from the contaminated system. The experiments were arranged to investigate the static and kinetic adsorption performance of modified zeolite. Results showed that the adsorption isotherms of Cu~(2+),Zn~(2+)ions were in accord with Langmuir. The theoretical saturated adsorption capacity was4 043 mg Cu/kg,4 087 mg Zn/kg. The kinetics data fitted Pseudo-second-order equation. Adsorption thermodynamics were calculated as follow,Gibbs free energy change ΔG < 0,enthalpy change ΔH > 0,entropy change ΔS > 0,and the adsorption potential E < 8 kJ/mol. The adsorption of Cu~(2+),Zn~(2+)ions on modified zeolite were spontaneous endothermic process dominated by physical adsorption.
Zeolite was modified with the doped wheat straw and calcinations in order to reinforce the capacity to remove heavy metals from the contaminated system. The experiments were arranged to investigate the static and kinetic adsorption performance of modified zeolite. Results showed that the adsorption isotherms of Cu~(2+),Zn~(2+)ions were in accord with Langmuir. The theoretical saturated adsorption capacity was4 043 mg Cu/kg,4 087 mg Zn/kg. The kinetics data fitted Pseudo-second-order equation. Adsorption thermodynamics were calculated as follow,Gibbs free energy change ΔG < 0,enthalpy change ΔH > 0,entropy change ΔS > 0,and the adsorption potential E < 8 kJ/mol. The adsorption of Cu~(2+),Zn~(2+)ions on modified zeolite were spontaneous endothermic process dominated by physical adsorption.
引文
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[22]万山.生物活性炭对水溶液中铜、锌离子吸附效果的测定与分析[J].湖北理工学院学报,2016,32(4):17-20.
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[2] Arjoon A,Olaniran A O,Pillay B. Co-contamination of water with chlorinated hydrocarbons and heavy metals:challenges and current bioremediation strategies[J]. International Journal of Environmental Science and Technology,2013,10(2):395-412.
[3] Garcia C M,Romero F A,Aragon M S,et al. Evaluation of remediation techniques in soils affected by residual contamination with heavy metals and arsenic[J]. Journal of Environmental Management,2017,191:228-236.
[4] Lan S,Leng Z H,Guo N,et al. Sesbania gum-based magnetic carbonaceous nanocomposites:Facile fabrication and adsorption behavior[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects,2014,446:163-171.
[5] Koodyńska D,Krukowska B J,Kazmierczak R J,et al.Uptake of heavy metal ions from aqueous solutions by sorbents obtained from the spent ion exchange resins[J]. Microporous and Mesoporous Materials,2017,244:127-136.
[6] Mohammad K U. A review on the adsorption of heavy metals by clay minerals,with special focus on the past decade[J]. Chemical Engineering Journal,2017,308:438-462.
[7]朱家亮,郝硕硕,吴文惠,等.改性沸石对铜吸附性能的研究[J].西南大学学报:自然科学版,2012,34(11):52-56.
[8]杨敏,柯俊锋,何晓曼,等.氢氧化钠改性沸石对水中Cu2+的吸附特性研究[J].环境污染与防治,2017,39(3):314-318.
[9]李方文,魏先勋,李彩亭,等.煅烧-碱溶法制粉煤灰类沸石吸附剂及其在处理含铅废水中的应用[J].环境污染治理技术与设备,2002,3(10):61-63,67.
[10] Agudelo J L,Hensen E M,Giraldo S A,et al. Influence of steam-calcination and acid leaching treatment on the VGO hydrocracking performance of faujasite zeolite[J]. Fuel Processing Technology,2015,133:89-96.
[11]杨炳飞,林海,董颖博.氢氧化钠预处理和盐热复合改性对沸石氨氮吸附性能的影响[J].硅酸盐学报,2017(2):303-311.
[12]杨攀,林荣英,张柏茂,等.天然斜发沸石除硅补铝改性对海水中K+的吸附性能研究[J].福州大学学报,2017,45(3):418-423.
[13] Li B,Yang L,Wang C Q,et al. Adsorption of Cd(II)from aqueous solutions by rape straw biochar derived from different modification processes[J]. Chemosphere,2017,175:332-340.
[14] Coelho G F,Goncalves A C,Novoa M J C,et al. Competitive and non-competitive cadmium,copper and lead sorption/desorption on wheat straw affecting sustainability in vineyards[J]. Journal of Cleaner Production,2016,139:1496-1503.
[15] Xu P,Sun C X,Ye X Z,et al. The effect of biochar and crop straws on heavy metal bioavailability and plant accumulation in a Cd and Pb polluted soil[J]. Ecotoxicology and Environmental Safety,2016,132:94-100.
[16]李晋,陈灏,潘纲,等. Zn(II)在δ-MnO2和γ-MnOOH两种矿物上吸附的初始溶质浓度效应[J].环境科学学报,2006,26(10):1606-1610.
[17]李见云,郑宾国,化全县,等.沸石粉对溶液中铜的吸附性能研究[J].中国农学通报,2011,27(14):240-243.
[18] McBride M B,Richards B K,Steenhuis T,et al. Long term leaching of trace elements in a heavily sludge-amended[J]. Soil Science,1999,164:613-623.
[19] Gomes P C,Fontes M P F,da Silva A G,et al. Selectivity sequence and competitive adsorption of heavy metals by Brazilian soils[J]. Soil Science of Society American Journal,2001,65:1115-1121.
[20] Cao X,Ma L Q,Rhue D R,et al. Mechanisms of lead,copper,and zinc retention by phosphate rock[J]. Environmental Pollution,2004,13(13):435-444.
[21]李鱼,王晓丽,张正,等.表层沉积物(生物膜)非残渣态组分的选择性萃取分离及其吸附铜/锌的特性[J].高等学校化学学报,2006,27(12):2285-2290.
[22]万山.生物活性炭对水溶液中铜、锌离子吸附效果的测定与分析[J].湖北理工学院学报,2016,32(4):17-20.
[23]臧传锋.纤维素基重金属吸附材料的制备及吸附性能研究[D].苏州:苏州大学,2016.
[24] Li R J,Liu L F,Yang F L. Removal of aqueous Hg(II)and Cr(VI)using phytic acid doped polyaniline/cellulose acetate composite membrane[J]. Journal of Hazardous Materials,2014,280:20-30.
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