摘要
为了实现漆渣生物质(LBM)资源化,探究了LBM对模拟废水中阳离子型染料亚甲基蓝(MB)和阴离子型染料刚果红(CR)的吸附去除潜力,分析了体系pH值、离子强度、LBM投加量和温度对LBM吸附MB和CR的影响,并基于扫描电子显微镜(SEM)、X射线衍射分析(XRD)及傅里叶红外光谱分析(FTIR)进一步表征吸附行为.结果表明:准二级动力学模型和Langmuir等温吸附模型可分别较好地描述LBM对MB和CR的吸附动力学(R^(2)>0.98)和等温吸附特征(R^(2)>0.96).LBM对MB和CR的最大吸附量分别为114.29 mg·g^(-1)和112.99 mg·g^(-1)(30℃).染料初始浓度100 mg·L^(-1)条件下,LBM对MB和CR的去除率随投加量的增加而增大,投加0.2 g时,MB和CR的去除率分别为95.94%和76.38%;一定温度范围内,温度的升高会促进LBM对MB(10~40℃)和CR(10~50℃)的吸附;MB和CR在LBM上的吸附受pH值或离子强度的影响均表现出相反的趋势,其中,MB的去除率随pH的升高而增加,CR的去除率随pH的升高而减小.5次吸附再解吸循环后,吸附态MB的解吸率均在78%左右,而吸附态CR的解吸率均<5.65%,说明MB吸附态LBM有再生潜力,而CR吸附态LBM属一次性材料,表明染料废水处理中可合理利用LBM这一材料.上述吸附过程是氢键作用、π-π键相互作用、静电作用及沉淀吸附等共同作用的结果.
This study aims to optimize the utilization of lacquer residue biomass (LBM) as a resource,investigating its potential for adsorption and removal of cationic dye methylene blue (MB) and anionic dye Congo red (CR) in simulated wastewater.The analysis considers the effects of pH,ionic strength,LBM dosage,and temperature on the adsorption of MB and CR by LBM.The adsorption behavior was further characterized using scanning electron microscopy (SEM),X-ray diffraction (XRD),and Fourier-transform infrared spectroscopy (FTIR).The results indicated that the pseudosecond-order kinetic model and Langmuir isothermal adsorption model could effectively characterize the adsorption kinetics (R^(2)>0.98) and isothermal adsorption (R^(2)>0.96) of MB and CR.The maximum adsorption amounts of MB and CR by LBM were 114.29 mg·g^(-1)and 112.99 mg·g^(-1) (30℃)respectively.Under an initial dye concentration of 100 mg·L^(-1),the removal rates of MB and CR by LBM increased with the dosage increase.When the LBM dosage was 0.2 g,the removal rate of MB and CR reached 95.94%and 76.38%respectively.The increase of temperature within a certain range promoted the adsorption of MB (10~40℃)and CR (10~50℃)by LBM.The adsorption of MB and CR on LBM showed opposite trends with changes in pH or ionic strength.The removals of MB increased with the increase of pH,while the removals of CR decreased.After five adsorption and desorption cycles,the desorption rates of adsorbed MB were about 78%,while the desorption rates of adsorbed CR were less than 5.65%,suggesting that MB adsorbed LBM has regeneration potential,while CR adsorbed LBM is a disposable material.Therefore,LBM can be effectively used in dye wastewater treatment.These characteristics result from the combined effects of hydrogen bonding,π-πbonding interactions,electrostatic interactions and precipitation adsorption.
作者
陆欣悦
廖敏
谢晓梅
邱浩
夏庆
郭斌
樊春林
LU Xinyue;LIAO Min;XIE Xiaomei;QIU Hao;XIA Qing;GUO Bin;FAN Chunlin(Zhejiang Key Laboratory of Agricultural Resources and Environment,College of Environmental and Resource Science of Zhejiang University,Hangzhou 310058;Experimental Teaching Center,College of Environment and Resources(Zhejiang University),Hangzhou 310058;Ningbo Ferno Biotechnology Co.,Ltd,Ningbo 315502)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第4期82-94,共13页
Acta Scientiae Circumstantiae
基金
国家重点研发计划项目(No.2018YFC1800400)。
关键词
漆渣生物质
亚甲基蓝
刚果红
吸附去除
lacquer residue biomass
methylene blue
Congo red
removal by adsorption
