核桃壳吸附去除水中罗丹明B的响应曲面优化及机理
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摘要
以废弃核桃壳为原料,制备低成本吸附剂,用于吸附废水中的染料罗丹明-B。采用响应曲面法研究pH、吸附剂投加量、初始染料浓度和接触时间对核桃壳吸附罗丹明B的影响,并对试验条件进行优化。研究结果表明,pH对核桃壳吸附罗丹明B的吸附容量影响显著,且当pH值为3.50,吸附剂投加量为0.05 g,初始染料浓度为175 mg/L,接触时间为80 min时,核桃壳对罗丹明B的吸附效果最好。相较于Freundlich模型,Langmuir模型更适合模拟核桃壳对罗丹明B的吸附。核桃壳对罗丹明B的吸附过程符合准二级动力学,且热力学计算表明该吸附过程是一个自发的吸热过程。红外光谱结果表明核桃壳上的-OH、-NH等官能团是罗丹明B的主要结合位点。研究结果表明核桃壳是一种具有潜力的吸附剂,可以有效去除废水中的罗丹明B染料。
A low cost adsorbent of walnut shell obtained from agricultural wastes was used to absorb dye rhodamine-B from aqueous solution. Response surface methodology(RSM) had been explored to study the influences of pH, adsorbent dosage, initial dye concentration and contact time on rhodamine-B adsorption and optimize the experimental conditions. The results indicated that pH has the significant effect on the adsorption process, and the optimal condition was pH value of 3.50, adsorbent dosage of 0.05 g, initial dye concentration of 175 mg/L, and contact time of 80 min. The Langmuir isotherm model was more applicable for describing the adsorption than Freundlich isotherm model. The kinetic study indicated that the experimental data were well fitted by the pseudo-second-order model, and thermodynamic study demonstrated that the adsorption was a spontaneous and endothermic process. The FTIR analysis indicated the functional groups of-OH,-NH on the walnut shell were the active binding sites for rhodamine B adsorption. The results revealed that WNS was a promising adsorbent to remove rhodamine B dye from wastewater.
A low cost adsorbent of walnut shell obtained from agricultural wastes was used to absorb dye rhodamine-B from aqueous solution. Response surface methodology(RSM) had been explored to study the influences of pH, adsorbent dosage, initial dye concentration and contact time on rhodamine-B adsorption and optimize the experimental conditions. The results indicated that pH has the significant effect on the adsorption process, and the optimal condition was pH value of 3.50, adsorbent dosage of 0.05 g, initial dye concentration of 175 mg/L, and contact time of 80 min. The Langmuir isotherm model was more applicable for describing the adsorption than Freundlich isotherm model. The kinetic study indicated that the experimental data were well fitted by the pseudo-second-order model, and thermodynamic study demonstrated that the adsorption was a spontaneous and endothermic process. The FTIR analysis indicated the functional groups of-OH,-NH on the walnut shell were the active binding sites for rhodamine B adsorption. The results revealed that WNS was a promising adsorbent to remove rhodamine B dye from wastewater.
引文
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[20] ZAMOUCHE M, HAMDAOUI O. Sorption of rhodamine B by cedar cone: Effect of pH and ionic strength[J]. Energy Procedia, 2012, 18(18): 1228-1239.
[21] HAMDAOUI O. Intensification of the sorption of rhodamine B from aqueous phase by loquat seeds using ultrasound[J]. Desalination, 2011, 271(1-3): 279-286.
[22] CAO J S, LIN J X, FANG F, et al. A new absorbent by modifying walnut shell for the removal of anionic dye: Kinetic and thermodynamic studies[J]. Bioresource Technology, 2014, 24(13): 199-205.
[23] TANG X R, DAI C, LI C, et al. Removal of methylene blue from aqueous solution using agricultural residue walnut shell: Equilibrium, kinetic, and thermodynamic studies[J]. Journal of Chemistry, 2017, 14(3): 1-10.
[24] KHAMPARIA S, JASPAL D K. Xanthium strumarium L. seed hull as a zero cost alternative for rhodamine B dye removal[J]. Journal of Environmental Management, 2017, 45(6): 498-506.
[25] 卢燕. 活性炭吸附罗丹明B的研究[J]. 四川理工学院学报(自然科学版), 2010, 23(6): 692-694.
[2] 许丽梅,康靖,曾勇明,等. SERS技术应用于食品中罗丹明B的快速检测[J]. 食品工业科技, 2017, 39(24): 238-242.
[3] 史会剑,朱大伟,胡欣欣,等. 印染废水处理技术研究进展探析[J]. 环境科学与管理, 2015, 40(2): 74-77.
[4] 胡必清,朱亚伟. 印染废水的化学法处理研究进展[J]. 印染, 2016(13): 46-50.
[5] HASSAN M M, CARR C M. A critical review on recent advancements of the removal of the reactive dyes from dyehouse effluent by ion-exchange adsorbents[J]. Chemosphere, 2018, 46(20): 201-219.
[6] HOLKAR C R, JADHAV A J, PINJARI D V, et al. A critical review on textile wastewater treatments: Possible approaches[J]. Journal of Environmental Management, 2016, 44(18): 351-366.
[7] KHAN R, BHAWANA P, FULEKAR M H. Microbial decolorization and degradation of synthetic dyes: A review[J]. Reviews in Environmental Science and Bio-Technology, 2013, 12(1): 75-97.
[8] AFROZE S, SEN T K. A review on heavy metal ions and dye adsorption from water by agricultural solid waste adsorbents[J]. Water and Soil Pollution, 2018, 44(7): 225-229.
[9] ALTUN T, PEHLIVAN E. Removal of Cr(VI) from aqueous solutions by modified walnut shells[J]. Food Chemistry, 2012, 41(2): 693-700.
[10] MOKRI H S G, MODIRSHAHLA N, BEHNAJADY M A, et al. Adsorption of C.I. acid red 97 dye from aqueous solution onto walnut shell: Kinetics, thermodynamics parameters, isotherms[J]. International Journal of Environmental Science and Technology, 2015, 33(12): 1401-1408.
[11] DAHRI M K, KOOH M R R, LIM L B L. Water remediation using low cost adsorbent walnut shell for removal of malachite green: Equilibrium, kinetics, thermodynamics and regeneration studies[J]. Journal of Environmental Chemical Engineering, 2014, 32(2): 1434-1444.
[12] DENIZ F. Effective removal of maxilon red GRL from aqueous solutions by walnut shell: Nonlinear kinetic and equilibrium models[J]. Environmental Progress & Sustainable Energy, 2014, 33(2): 396-401.
[13] 唐然肖,李妍,范胜男,等. 核桃壳粉对阳离子染料结晶紫的吸附特性[J]. 河北大学学报(自然科学版), 2018, 38(3): 254-261.
[14] ZHANG J J, YAN X L, HU X Y, et al. Direct carbonization of Zn/Co zeolitic imidazolate frameworks for efficient adsorption of Rhodamine B[J]. Chemical Engineering Journal, 2018, 23(15): 640-647.
[15] 王丽聪. 石墨对印染废水中罗丹明B的吸附研究[J]. 四川化工, 2017, 20(2): 48-51.
[16] YU J X, LI B H, SUN X M, et al. Adsorption of methylene blue and rhodamine B on baker's yeast and photocatalytic regeneration of the biosorbent[J]. Biochemical Engineering Journal, 2009, 45(2): 145-151.
[17] 李丹,金修齐,王朋,等. 水稻秸秆生物炭对罗丹明B的吸附与降解[J]. 环境工程学报, 2017, 11(9): 5195-5200.
[18] KHAN T A, DAHIYA S, ALI I. Use of kaolinite as adsorbent: Equilibrium, dynamics and thermodynamic studies on the adsorption of rhodamine B from aqueous solution[J]. Applied Clay Science, 2012, 69(21): 58-66.
[19] PARDESHI S D, SONAR J P, ZINE A M, et al. Kinetic and thermodynamic study of adsorption of methylene blue and rhodamine B on adsorbent prepared from hyptis suaveolens (vilayti tulsi)[J]. Journal of the Iranian Chemical Society, 2013, 10(6): 1159-1166.
[20] ZAMOUCHE M, HAMDAOUI O. Sorption of rhodamine B by cedar cone: Effect of pH and ionic strength[J]. Energy Procedia, 2012, 18(18): 1228-1239.
[21] HAMDAOUI O. Intensification of the sorption of rhodamine B from aqueous phase by loquat seeds using ultrasound[J]. Desalination, 2011, 271(1-3): 279-286.
[22] CAO J S, LIN J X, FANG F, et al. A new absorbent by modifying walnut shell for the removal of anionic dye: Kinetic and thermodynamic studies[J]. Bioresource Technology, 2014, 24(13): 199-205.
[23] TANG X R, DAI C, LI C, et al. Removal of methylene blue from aqueous solution using agricultural residue walnut shell: Equilibrium, kinetic, and thermodynamic studies[J]. Journal of Chemistry, 2017, 14(3): 1-10.
[24] KHAMPARIA S, JASPAL D K. Xanthium strumarium L. seed hull as a zero cost alternative for rhodamine B dye removal[J]. Journal of Environmental Management, 2017, 45(6): 498-506.
[25] 卢燕. 活性炭吸附罗丹明B的研究[J]. 四川理工学院学报(自然科学版), 2010, 23(6): 692-694.