以竹笋壳为吸附剂,碱性湖蓝BB(MBB)及碱性艳蓝R(BBR)为吸附质,考察了竹笋壳对碱性染料吸附过程的动力学和热力学行为,以及吸附剂投加量、吸附剂粒径、染料初始浓度、吸附时间、温度、离子强度和水体pH等多种因素对吸附性能的影响,并结合SEM和FT-IR光谱分析,初步探讨了竹笋壳对染料的吸附机制。结果表明,25℃下,2.0g/L 140目竹笋壳在中性条件下处理350mg/L碱性染料溶液时,吸附平衡时间为60min,MBB和BBR的吸附量分别为174.4mg/g和148.9mg/g。竹笋壳对碱性染料的吸附行为符合Langmuir等温吸附方程,热力学参数ΔH、ΔG和ΔS均为负值,说明该吸附过程可自发进行,低温利于吸附。动力学数据分别用准一级吸附动力学方程、准二级吸附动力学方程和颗粒内扩散方程进行拟合,表明该吸附过程符合拟二级动力学模型(R2=0.999),吸附过程主要由化学吸附控制,主要分为表面吸附和内扩散吸附两个阶段。
The removal of hazardous dyes of methylene blue BB and basic brilliant blue R in aqueous media were studied with agricultural bamboo shoot shell as adsorbent.The effects of adsorbent on the basic dye adsorption process were investigated in detail,such as the adsorption kinetics and thermodynamics,particle size of adsorbent,the initial concentration of dyes,adsorption time,the temperature,ionic strength and pH of system.At 25℃,the adsorption equilibrium time of 60 min,2.0g·L-1 140 mesh bamboo shoot shells in the neutral of 350mg·L-1 basic dye solution,the results showed the adsorption capacity of MBB and BBR were 174.4mg·g-1 and 148.9mg·g-1,respectively.The Langmuir adsorption isotherm model fitted the adsorption process well.The enthalpy (ΔH),free energy (ΔG) and entropy (ΔS)changes of adsorption were all negative.The adsorption of MBB and BBR was spontaneous and exothermic process,and therefore,low temperature was advantageous to the adsorption.The kinetic data were fitted by the first-order adsorption kinetic equation,the second-order adsorption kinetic equation and the diffusion equation in the particle.The results of kinetic showed that the adsorption of MBB and BBR could be described by the pseudo-second order kinetic model,and controlled by the chemical reaction(R2=0.999).The MBB and BBR adsorption process comprised two steps:surface adsorption and intraparticle diffusion adsorption.
[1] Fei X,Li W,Zhu S,et al.Simultaneous treatment of dye wastewater and surfactant wastewater by foam separation:experimental and mesoscopic simulation study[J].Separation Science,2018,53(10):1604-1610.
[2] Qiu G,Wu Y,Qi L,et al.Study on the degradation of azo dye wastewater by zero-valent Iron[J].Nature Environment and Pollution Technology,2018,17(2):479-483.
[3] Kang L,Du H L,Du X,et al.Study on dye wastewater treatment of tunable conductivity solid-waste-based composite cementitious material catalyst[J].Desalination and Water Treatment,2018,125:296-301.
[4] Sharma S,Hasan A,Kumar N,et al.Removal of methylene blue dye from aqueous solution using immobilized Agrobacterium fabrum biomass along with iron oxide nanoparticles as biosorbent[J].Environmental Science and Pollution Research,2018,25(9):1-11.
[5] Cotillas S,Llanos J,Canizares P,et al.Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation[J].Electrochimica Acta,2018,263:1-7.
[6] Lu N,Wang Y Q,Luo M,et al.Simulated study on the degradation of monoand bi-component dye wastewater by TiO2/H3PW12O40 film excited under solar-like radiation[J].Polish Journal of Environmental Studies,2019,28(3):1805-1812.
[7] Akankshakalra H P,Hui C W,Mackey H,et al.Adsorption of dyes from water on to bamboo-based activated carbon-error analysis method for accurate isotherm parameter determination[J].Journal of Water Science and Engineering,2019,1(1):1-11.
[8] Chen J,Liu S,Ge H,et al.A hydrophobic bio-adsorbent synthesized by nanoparticle-modified graphene oxide coated corn straw pith for dye adsorption and photocatalytic degradation[J].Environmental Technology,2019:1-13.
[9] Hasri,Mudasir,Ummas H.Adsorption of Cd(Ⅱ) metal Ion on adsorbent beads from biomass Saccharomycess cereviceae-Chitosan[J].Journal of Physics Conference Series,2018,954(1):012020.
[10] Yu J,Zhang X,Wang D,et al.Adsorption of methyl orange dye onto biochar adsorbent prepared from chicken manure[J].Water Science & Technology A Journal of the International Association on Water Pollution Research,2018,77(5/6):1303-1312.
[11] Khan T A,Nazir M.Enhanced adsorptive removal of a model acid dye bromothymol blue from aqueous solution using magnetic chitosan-bamboo sawdust composite:Batch and column studies[J].Environmental Progress and Sustainable Energy,2015,34(5):1444-1454.
[12] 李辉宇.黄甜竹笋壳对水溶液中六价铬的吸附性能研究[D].福州:福州大学,2016.
[13] Ashirmori M,Katayama T,Aoyama E,et al.Study on splitting of bamboo fibers due to freezing and tensile strength of FRTP using bamboo fibers[J].JSME International Journal Series A Solid Mechanics and Material Engineering,2004,47(4):566-569.
[14] Thwe M M,Liao K.Effects of environmental aging on the mechanical properties of bamboo-glass fiber reinforced polymer matrix hybrid composites[J].Composites Part A (Applied Science and Manufacturing),2002,33(1):0-52.
[15] 陈延兴.竹笋壳纤维的研发及应用[D].武汉:武汉纺织大学,2010.
[16] 翁晴.改性笋壳对结晶紫的吸附性能研究[J].湘潭大学自然科学学报,2015,37(3):71-77.
[17] Zhang W,Li H,Kan X,et al.Adsorption of anionic dyes from aqueous solutions using chemically modified straw[J].Bioresource Technology,2012,117:40-7.
[18] Gupta K,Khatri O P.Reduced graphene oxide as an effective adsorbent for removal of malachite green dye:plausible adsorption pathways[J].Journal of Colloid and Interface Science,2017,501:11-21.
[19] 刘蕾,付临汝,杜馨,等.联合改性污泥吸附剂去除废水中铬(Ⅵ)[J].环境化学,2018,37(12):2596-2602.
[20] 陈锦诗,孙诗乐,黄文海,等.CaF2-CR杂化吸附材料对乙基紫的吸附性能研究[J].化学试剂,2018,40(10):937-942.
[21] 赵丹华.CaF2-WAGGS杂化吸附材料的制备及应用研究[J].水处理技术,2012,38(8):51-54.
[22] Guo J,Chen S,Liu L,et al.Adsorption of dye from wastewater using chitosan-CTAB modified bentonites[J].Journal ofColloid and Interface Science,2012,382(1):61-66.
[23] Li L,Qi G,Wang B,et al.Fulvic acid anchored layered double hydroxides:a multifunctional composite adsorbent for the removal of anionic dye and toxic metal[J].Journal of Hazardous Materials,2018,343:19-28.
[24] Pauletto P S,Goncalves J O,Pinto L A A,et al.Single and competitive dye adsorption onto chitosan-based hybrid hydrogels using artificial neural network modeling[J].Journal of Colloid and Interface Science,2020,560:722-729.
[25] Zhang J M,Zhong Z W,Zhu D P,et al.Application of bamboo shoot shell in color removal from methylene blue solution[J].Applied Mechanics and Materials,2014,675-677:489-492.
[26] 刘瑶,杜平,王玉萍.染料化合物在改性介孔TiO2上的吸附[J].环境化学,2014,33(6):976-984.
[27] Sui H,Li L,Zhu X,et al.Modeling the adsorption of PAH mixture in silica nanopores by molecular dynamic simulation combined with machine learning[J].Chemosphere,2016,144:1950-9.
[28] Zhang R,Yan W,Jing C,et al.Experimental and molecular dynamic simulation study of perfluorooctane sulfonate adsorption on soil and sediment components[J].Journal of Environmental Sciences,2015,29:131-8.
[29] 赵丹华,观丙林,陈宗坚,等.改性甘蔗渣吸附剂的制备及其对直接桃红12B的吸附性能研究[J].化工新型材料,2018,46(2):259-263,267.
[30] 赵宁波,魏亮亮,宋旭刚,等.四环素在典型土壤中的吸附行为·吸附动力学·热力学特征[J].安徽农业科学,2017,45(16):57-62.
[31] Li J,Sun R,Hao C,et al.The behavior of the adsorption of cytochrome C on lipid monolayers:A study by the Langmuir-Blodgett technique and theoretical analysis[J].Biophysical Chemistry,2015,205:33-40.
[32] Wang H,Yuan X Z,Zeng G,et al.Removal of malachite green dye from wastewater by different organic acid-modified natural adsorbent:kinetics,equilibriums,mechanisms,practical application,and disposal of dye-loaded adsorbent[J].Environmental Science and Pollution Research International,2014,21(19):11552-11564.
[33] 赵宇,阮文辉,汤佳鹏,等.SH15树脂吸附胞二磷胆碱的热力学及动力学研究[J].离子交换与吸附,2009,25(3):208-217.