Adsorption of phenol from simulated wastewater by organic bentonite

doi:10.16085/j.issn.1000-6613.2017.02.046

Abstract

Abstract: Commercial organic bentonite was used as adsorbent to treat the phenol simulated wastewater. The microstructure and surface chemical properties of organic bentonite were characterized by N₂ physical adsorption analyzer,scanning electron microscope (SEM)and Fourier transform infrared spectroscopy (FTIR). Effects of adsorption time,dosage of adsorbent,temperature and solution pH on phenol adsorption performance were investigated and the kinetic characteristics in adsorption process was also studied. The results showed that organic bentonite belongs to the typical mesoporous materials in which the specific surface area and total pore volume can reach 31.7m²/g and 0.113cm³/g,and the pore size distribution is in the range of 3-24nm. Moreover,the organic bentonite exhibits obvious lamellar structure and rich surface functional groups. Adsorption time,adsorbent dosage,temperature and solution pH are the important factors on phenol removal. When adsorption time is 120min,adsorbent dosage is 2g,temperature is 30℃and solution pH is 7,the phenol removal rate and adsorption capacity of organic bentonite can reach 71.32% and 1.78 mg/g,respectively. The adsorption of phenol on organic bentonite follows the pseudo-second-order kinetic model.

Key words: organic bentonite, phenol, waste water, adsorption, kinetics, removal rate

摘要： 以商品化有机膨润土为吸附剂来处理含酚模拟废水，在利用低温N₂物理吸附仪、扫描电镜（SEM）和傅里叶红外光谱仪（FTIR）系统研究有机膨润土微观结构及表面化学性质的基础上，系统考察了吸附时间、吸附剂用量、温度及溶液pH等因素对模拟废水中苯酚吸附特性的影响，并探讨其吸附过程的动力学。结果表明，该有机膨润土的比表面积及总孔容分别可达31.7m²/g和0.113cm³/g，孔径主要分布在3~24nm，属于典型的介孔材料，且具有明显的片层结构和较为丰富的表面官能团。吸附时间、吸附剂用量、温度及溶液pH是影响苯酚脱除的重要因素。当吸附时间为120min、吸附剂用量为2g、温度为30℃、溶液pH为7时，有机膨润土对模拟废水中苯酚的脱除率和吸附量分别为71.32%和1.78mg/g。有机膨润土对苯酚的吸附过程可用伪二级动力学模型描述。

关键词: 有机膨润土, 苯酚, 废水, 吸附, 动力学, 脱除率

CLC Number:

TD875.5
X52

CHEN Huanli, XING Baolin, CHEN Lunjian, XU Bing, SU Yu, GUO Hui. Adsorption of phenol from simulated wastewater by organic bentonite[J]. Chemical Industry and Engineering Progree, 2017, 36(02): 735-741.

陈焕利, 邢宝林, 谌伦建, 徐冰, 苏毓, 郭晖. 有机膨润土对模拟废水中苯酚的吸附特性[J]. 化工进展, 2017, 36(02): 735-741.

References

[1] 刘淑琴,张军,梁杰,等.煤炭地下气化的综合利用前景[J].煤炭科学技术,2003,31(7):50-53. LIU S Q,ZHANG J,LIANG J,et al.Outlook on comprehensive utilization of underground coal gasification[J].Coal Science and Technology,2003,31(7):50-53.
[2] FRIEDMANN S J,UPADHYE R,KONG F M.Prospects for underground coal gasification in carbon-constrained world[J]. Energy Procedia,2009,1(1):4551-4557
[3] 朱铭,徐道一,孙文鹏,等.解决大气环境污染的新途径:煤地下气化[C]//2009中国可持续发展论坛暨中国可持续发展研究会学术年会论文集(上册).北京:中国人口·资源与环境,2009:213-217. ZHU M,XU D Y,SUN W P,et al.A new way to solve the environmental pollution of the atmosphere:underground coal gasification[C]//2009 China Sustainable Development Forum and China Institute of sustainable development Academic Annual Conference.Beijing:China Population Resources and Environment,2009:213-217.
[4] MICHAEL J H,C.FLETCHER M.Groundwater pollutants from underground coal gasification[J].Water Research,1978,12(7):463-469.
[5] STUERMER D H,NG D J,MORRIS C J.Organic contaminants in groundwater near an underground coal gasification site in northeastern Wyoming[J].Environmental Science & Technology,1982,16(9):582-587.
[6] 张锦,李圭白,马军.含酚废水的危害及处理方法的应用特点[J].化学工程师,2001(2):36-37. ZHANG J,LI G B,MA J.Detriment and treatment method of wastewater containing phenols[J].Chemical Engineer,2001(2):36-37.
[7] 斯琴高娃,乌云,田艳飞.浅析苯酚对环境的污染[J].内蒙古石油化工,2006(12):50-51. SIQIN G W,WU Y,TIAN Y F.An analysis of phenol pollution on the environment[J].Inner Mongolia Petrochemical Industry,2006(12):50-51.
[8] 国家环境保护总局、国家质量监督检验检疫总局.地表水环境质量标准:GB 3838-2002[S].北京:中国环境科学出版社,2002. State Environmental Protection Administration of China,General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China.Environmental quality standards of surface water:GB3838-2002[S].Beijing:China Environmental Science Press,2002.
[9] 孙志斌,武巧仙.含酚废水处理方法及进展[J].精细与专用化学品,2012,20(8):49-53. SUN Z B,WU Q X.Treatment process and progress of wastewater containing phenols[J].Fine and Specialty Chemicals,2012,20(8):49-53.
[10] 李玉标.含酚废水的处理方法[J].净水技术,2005,24(2):51-54. LI Y B.Treatment of wastewater containing phenols[J].Water Purification Technology,2005,24(2):51-54.
[11] 朱利中,陈宝梁.膨润土吸附材料在有机污染控制中的应用[J].化学进展,2009,21(2/3):420-429. ZHU L Z,CHEN B L.Use of bentonite-based sorbents in organic pollutant abatements[J].Progress in Chemistry,2009,21(2/3):420-429.
[12] MA J F,ZHU L Z.Removal of phenols from water accompanied with synthesis of organo-bentonite in one-step process[J].Chemosphere,2007,68(10):1883-1888.
[13] 叶力佳,刘建远.有机膨润土的制备及结构表征[J].中国非金属矿工业导刊,2008(3):31-33. YE L J,LIU J Y.Study on preparation and structure characterization of organobentonite[J].China Non-Metallic Mining Industry Herald,2008(3):31-33.
[14] 唐文广,聂锦旭.有机膨润土吸附废水中苯酚的机理[J].净水技术,2011,30(1):49-52. TANG W G,NIE J X.Mechanism of phenol removal in wastewater by organic modified bentonite adsorption[J].Water Purification Technology,2011,30(1):49-52.
[15] GREGG S J,SING K S W.Adsorption,surface area and porosity[M].London:Academic Press,1982:111-218.
[16] 李静.有机膨润土的制备、表征及其对废水中酚类化合物的吸附研究[D].太原:太原理工大学,2013. LI J.Preparation、characterization of organic bentonite and its adsorption for phenolic compounds in wastewaters[D].Taiyuan:Taiyuan University of Technology,2013.
[17] ROUQUEROL J,SING K S W. Adsorption at the gas-solid and liquid-solid interface,studies in surface science and catalysis[M].Elseiver,1982:163-164.
[18] 郑玉婴,王灿耀,傅明连.膨润土有机改性的FTIR和XRD研究[J].光谱学与光谱分析,2005,25(11):181-186. ZHENG Y Y,WANG C Y,FU M L.Research of FTIR and XRD study on the organic modification of bentonites[J]. Spectroscopy and Spectral Analysis,2005,25(11):181-186.
[19] 张灿.芳基有机膨润土对水中酚类化合物的吸附性能研究[D].杭州:浙江工商大学,2010. ZHANG C.Study on the adsorption of phenolic compounds by aryl organobentonites from water[D].Hangzhou:Zhejiang Gongshang University,2010.
[20] 刘学贵,郑维涛,王祝敏,等.十六烷基溴化铵有机改性天然钠基膨润土的研究[J].化学工程师,2010,178(7):5-7. LIU X G,ZHENG W T,WANG Z M,et al.Study on natural Na-base bentonite modificated by CTMAB[J].Chemical Engineer,2010,178(7):5-7.
[21] 赵振国.吸附作用应用原理[M].北京:化学工业出版社,2005:75-144. ZHAO Z G.Application principle of adsorption[M].Beijing:Chemical Industry Press,2005:75-144.
[22] 张斌,孟昭福,李婷,等.两性修饰膨润土对苯酚吸附的动力学研究[J].干旱地区农业研究,2012,30(3):200-204. ZHANG B,MENG Z F,LI T,et al.Adsorption kinetics of phenol on bentonite modified with BS-18[J].AgriculturalResearch in the Arid Areas,2012,30(3):200-204.
[23] 苏锦,王清萍,金晓英,等.纳米有机膨润土对苯酚的吸附性能研究[J].环境污染与防治,2010,32(3):39-42. SU J.WANG Q P,JIN X Y,et al.The removal of phenol from aqueous solutions using nano-organo bentonite[J]. Environmental Pollution & Control,2010,32(3):39-42.
[24] STUMM W,MORGAN J J.水化学[M].汤宏霄,译.北京:科学出版社,1987. STUMM W,MORGAN J J. Aquatic chemistry[M].TANG H X,trans.Beijing:Science Press,1987.
[25] ALLEN S J,MCKAY G,KHADER K Y H.Intraparticle diffusion of a basic dye during adsorption onto sphagnum peat[J].Environmental Pollution,1989,56(1):39-50.