木本泥炭对Cr(Ⅵ)的吸附性能
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摘要
以木本泥炭为吸附材料,用于去除水中的Cr(Ⅵ).研究了溶液pH值、吸附时间、木本泥炭用量、缓冲液浓度和初始浓度对Cr(Ⅵ)吸附的影响,以及溶液pH值对Cr(Ⅵ)解吸附的影响.结果表明,木本泥炭对Cr(Ⅵ)的去除率随溶液pH值的增大而减小,当溶液pH值为4时,木本泥炭对Cr(Ⅵ)的吸附能力最强,3.33 g·L~(-1)木本泥炭对100 mg·L~(-1)Cr(Ⅵ)的吸附量为29. 98 mg·g~(-1);当磷酸盐缓冲液浓度在0. 10—0.20 mol·L~(-1)范围内时,随着缓冲液浓度的增大Cr(Ⅵ)的吸附量逐渐减小;木本泥炭对Cr(Ⅵ)的吸附符合准一级反应动力学,其吸附等温线符合Langmuir吸附模型;当溶液pH值小于6时,Cr(Ⅵ)的解吸率低于0.32%.
Woody peat was an used as adsorbent for the removal of Cr( Ⅵ) form aqueous solutions.The effects of solution pH,contract time,dosage of woody peat,buffer concentration and the initial concentration of Cr( Ⅵ) on the removal rate of Cr( Ⅵ) were investigated. The influence of pH on the desorption of Cr( Ⅵ) was examined also. The results show that the removal rate of Cr( Ⅵ) in aqueous solutions decreased with the increase of solution pH and the concentration of phosphate buffer( 0. 10 to 0. 20 mol·L~(-1)). The maximum adsorption amount of 29.98 mg·g~(-1) was obtained under an initial pH of 4 for 100 mg·L~(-1)Cr( Ⅵ) treated with 3.33 g·L~(-1)woody peat. The adsorption kinetics of Cr( Ⅵ) followed the pseudo-first-order kinetic model,and the adsorption isotherm data fitted well with the Langmuir equation. The desorption rate of Cr( Ⅵ) was less than 0.32% when the solution pH was lower than 6.
Woody peat was an used as adsorbent for the removal of Cr( Ⅵ) form aqueous solutions.The effects of solution pH,contract time,dosage of woody peat,buffer concentration and the initial concentration of Cr( Ⅵ) on the removal rate of Cr( Ⅵ) were investigated. The influence of pH on the desorption of Cr( Ⅵ) was examined also. The results show that the removal rate of Cr( Ⅵ) in aqueous solutions decreased with the increase of solution pH and the concentration of phosphate buffer( 0. 10 to 0. 20 mol·L~(-1)). The maximum adsorption amount of 29.98 mg·g~(-1) was obtained under an initial pH of 4 for 100 mg·L~(-1)Cr( Ⅵ) treated with 3.33 g·L~(-1)woody peat. The adsorption kinetics of Cr( Ⅵ) followed the pseudo-first-order kinetic model,and the adsorption isotherm data fitted well with the Langmuir equation. The desorption rate of Cr( Ⅵ) was less than 0.32% when the solution pH was lower than 6.
引文
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[18]李营,陈平,李长海,等.弱碱性树脂对Cr(Ⅵ)的吸附-解吸性能研究[J].应用化工,2011,40(10):1686-1688.LI Y,CHEN P,LI C H,et al. Study on the adsorption-desorption of weakly basic resin for Cr(Ⅵ)[J]. Applied Chemical Industry,2011,40(10):1686-1688(in Chinese).
[19]苏文海.二苯碳酰二肼光度法测定水中六价铬方法的改进[J].环境科学导刊,2009,28(5):77-78.SHU W H. Improvement of diphenylcarbohydrazide spectrophotometric method used to determine hexavalent chromium in the Water[J].Environmental Science Survey,2009,28(5):77-78(in Chinese).
[20]周小瑞,于凤文,韦一,等.汽爆铜藻对模拟废水中Cr(Ⅵ)的吸附特性研究[J].高校化学工程学报,2018,32(2):464-471.ZHOU X R,YU F W,WEI Y,et al. Adsorption characteristic of chromium from imitated wastewater by steam-exploded sargassum horneri[J]. Journal of Chemical Engineering of Chinese Universities,2018,32(2):464-471(in Chinese).
[21]徐跃年.泥炭吸附铬离子的机理研究[J].环境保护,1995,5:15.XU Y N. Study on the mechanism of adsorption of chromium ions by peat[J]. Environmental Protection,1995,5:15(in Chinese).
[22]王玥,秦帆,唐燕华,等.玉米芯改性吸附剂对水中Cr(Ⅵ)的吸附性能研究[J].森林工程,2018,34(1):65-70.WANG Y,QIN F,TANG Y H,et al. Adsorption characteristics of chromium(Ⅵ)by modified corncob[J]. Forest Engineering,2018,34(1):65-70(in Chinese).
[23] BARAL S S,DAS S N,CHAUDHURY G R,et al. Adsorption of Cr(Ⅵ)using thermally activated weed salvinia cucullata[J]. Chemical Engineering Journal,2008,139(2):245-255.
[2] KASIULIENCE A,CARABANTE I,BHATTACHARYA P,et al. Removal of metal(oid)s from contaminated water using iron-coated peat sorbent[J]. Chemosphere,2018,198:290-296.
[3] SINGH R,MISRA V,SINGH R P. Removal of hexavalent chromium from contaminated ground water using zero-valent iron nanoparticles[J]. Environmental Monitoring&Assessment,2012,184(6):3643-3651.
[4]王后锦,吴晓婧,王亚玲,等.二氧化钛纳米管阵列光电催化同时降解苯酚和Cr(Ⅵ)[J].催化学报,2011,32(4):637-642.WANG H J,WU X Q,WANG Y L,et al. Simultaneous removal of phenol and Cr(Ⅵ)by Ti O2nanotube array photoelectrocatalysis[J].Chinese Journal of Catalysis,2011,32(4):637-642(in Chinese).
[5]肖轲,徐夫元,降林华,等.离子交换法处理含Cr(Ⅵ)废水研究进展[J].水处理技术,2015,41(6):6-11.XIAO K,XU F Y,JIANG L H,et al. The treatment of hexavalent chromium wastewater by ion exchange method[J]. Technology of Water Treatment,2015,41(6):6-11(in Chinese).
[6]李雯,张光华,刘林涛.硅胶负载微波交联壳聚糖对制革废水中Cr(Ⅵ)的吸附研究[J].西部皮革,2010,32(1):33-35.LI W,ZHANG G H,LIU L T. Silica gel based cross-linked chitosan prepared under microwave irradiation as Cr(Ⅵ)adsorbent[J]. West Leather,2010,32(1):33-35(in Chinese).
[7]褚效中,赵宜江,徐继明,等.高比表面积活性炭的制备及对Cr(Ⅵ)吸附的研究[J].环境工程学报,2010,4(2):315-318.CHU X Z,ZHAO Y J,XU J M,et al. Preparation of activated carbon with high specific surface area and study on Cr(Ⅵ)adsorption[J].Chinese Journal of Environmental Engineering,2010,4(2):315-318(in Chinese).
[8]赖长鸿,颜增光,廖博文,等.皇竹草生物炭的结构特征及其对Cr(Ⅵ)的吸附性能[J].农业环境科学学报,2016,35(6):1188-1193.LAI C H,YAN Z G,LIAO B W,et al. Structural feature and chromium(Ⅵ)adsorption of biochar derived from pennisetum hydridum[J]. Journal of Agro-Environment Science,2016,35(6):1188-1193(in Chinese).
[9]王忠强,张心昱,孟宪民,等.泥炭形成过程对泥炭基质替代物研究的启示[J].自然资源学报,2012,27(7):1252-1258.WANG Z Q,ZHANG X Y,MENG X M,et al. The enlightenment of nature peat formation to peat substitute research[J]. Journal of Natural Resources,2012,27(7):1252-1258(in Chinese).
[10]孟宪民.我国泥炭资源的储量、特征与保护利用对策[J].自然资源学报,2006,21(4):567-574.MENG X M. The deposit,characteristic and exploitation strategy of peat resources in China[J]. Journal of Natural Resources,2006,21(4):567-574(in Chinese).
[11] LEN-TORRES A,CUERDA-CORREA E M,FERNNDEZ-GONZLEZ C,et al. On the use of a natural peat for the removal of Cr(Ⅵ)from aqueous solutions[J].Journal of Colloid&Interface Science,2012,386(1):325.
[12] KNNEN M,JAUHIAINEN J,LAIHO R,et al. Physical and chemical properties of tropical peat under stabilised land uses.[J]. Mires&Peat,2015,16(8):1-13.
[13]姚冬梅,付春香,李萍.泥炭对重金属离子的吸附性能[J].黑龙江科技大学学报,2006,16(1):38-40.YAO D M,FU C X,LI P. Specific properties of adsorption for heavy metal ions on peat[J]. Journal of Heilongjiang Institute of Science&Technology,2006,16(1):38-40(in Chinese).
[14]马宏瑞,黄宁选,张景飞,等.泥炭对溶液中铬的吸附及其在制革废水处理中的应用[J].环境化学,2003,22(6):596-600.MA H R,HUANG N X,ZHANG J F,et al. Hong,Cr(Ⅲ)adsorption from aqueous solution by peat and its application to tannery wastewater[J]. Environmental Chemistry,2003,22(6):596-600(in Chinese).
[15]邵志国,王起超,刘汝海,等.汞在泥炭上的吸附特征研究[J].土壤通报,2005,36(1):108-112.SHAO Z G,WANG Q C,LIU R H,et al. Characteristics of adsorption and desorption of mercury on peat[J]. Chinese Journal of Soil Science,2005,36(1):108-112(in Chinese).
[16]马海洋,陈清,石伟琦,等.木本泥炭施用对香蕉园土壤养分状况的影响[J].中国南方果树,2017,46(3):51-56.MA H Y,CHEN Q,SHI W,et al. Effects of application of woody peat on soil nutrient status in banana orchard[J]. South China Fruits,2017,46(3):51-56(in Chinese).
[17]陈硕,聂海斌,谭钧,等.木本泥炭促进设施番茄生长和改良土壤的效果[J].中国蔬菜,2015,1(10):42-46.CHEN S,NIE H B,TAN J,et al. Effect of wood peat on greenhouse tomato growth and soil improvement[J]. China Vegetables,2015,1(10):42-46(in Chinese).
[18]李营,陈平,李长海,等.弱碱性树脂对Cr(Ⅵ)的吸附-解吸性能研究[J].应用化工,2011,40(10):1686-1688.LI Y,CHEN P,LI C H,et al. Study on the adsorption-desorption of weakly basic resin for Cr(Ⅵ)[J]. Applied Chemical Industry,2011,40(10):1686-1688(in Chinese).
[19]苏文海.二苯碳酰二肼光度法测定水中六价铬方法的改进[J].环境科学导刊,2009,28(5):77-78.SHU W H. Improvement of diphenylcarbohydrazide spectrophotometric method used to determine hexavalent chromium in the Water[J].Environmental Science Survey,2009,28(5):77-78(in Chinese).
[20]周小瑞,于凤文,韦一,等.汽爆铜藻对模拟废水中Cr(Ⅵ)的吸附特性研究[J].高校化学工程学报,2018,32(2):464-471.ZHOU X R,YU F W,WEI Y,et al. Adsorption characteristic of chromium from imitated wastewater by steam-exploded sargassum horneri[J]. Journal of Chemical Engineering of Chinese Universities,2018,32(2):464-471(in Chinese).
[21]徐跃年.泥炭吸附铬离子的机理研究[J].环境保护,1995,5:15.XU Y N. Study on the mechanism of adsorption of chromium ions by peat[J]. Environmental Protection,1995,5:15(in Chinese).
[22]王玥,秦帆,唐燕华,等.玉米芯改性吸附剂对水中Cr(Ⅵ)的吸附性能研究[J].森林工程,2018,34(1):65-70.WANG Y,QIN F,TANG Y H,et al. Adsorption characteristics of chromium(Ⅵ)by modified corncob[J]. Forest Engineering,2018,34(1):65-70(in Chinese).
[23] BARAL S S,DAS S N,CHAUDHURY G R,et al. Adsorption of Cr(Ⅵ)using thermally activated weed salvinia cucullata[J]. Chemical Engineering Journal,2008,139(2):245-255.