鸡蛋壳废料对水体中Cr(Ⅵ)的吸附特征与机理
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摘要
利用鸡蛋壳废料对水中的Cr(Ⅵ)进行吸附处理,研究溶液p H、振荡时间、投加量和温度对鸡蛋壳废料吸附水体中Cr(Ⅵ)的特征和吸附机理。结果表明,在含有1 mg/L的Cr(Ⅵ)溶液的100 m L吸附体系中,鸡蛋壳废料可在30 min内完成吸附过程。溶液p H=2.5时,吸附量最大。鸡蛋壳投加量为1.0 g时,平衡吸附容量为0.0917 mg/g。利用鸡蛋壳去除水中Cr(Ⅵ)的最佳工艺参数为振荡时间30 min,初始p H为3.0,投加量2.0 g,体系温度35℃。鸡蛋壳对Cr(Ⅵ)的吸附过程用Langmiur和Freundlich方程能较好拟合,其中理论饱和吸附量在20℃、30℃和40℃时分别为0.1944、0.2034和0.2096 mg/g。吸附的焓变为8.76×10-3k J/mol,熵变为-45.96 J/(mol·K),吉布斯自由能变均为正值,变化范围是4.357~9.693 k J/mol。鸡蛋壳对Cr(Ⅵ)的吸附过程主要为物理性的单分子层和多分子层吸附。
The egg shell was used for Cr( Ⅵ) adsorption from aqueous solution. The p H,shake time,dosage and temperature were investigated to explore the characteristics and mechanism of the adsorption process. The results showed that in the 100 m L solution system contained 1 mg / L Cr( Ⅵ),the adsorption process could be completed by egg shell within 30 min. The maximum adsorption capacity was observed at p H 2. 5. The equilibrium adsorption capacity was 0. 0917 mg / g when the dosage of egg shell was 1. 0 g. The optimal conditions of egg shell Cr( Ⅵ) adsorption were original p H 3. 0,egg shell dosage of 2. 0 g,shake time of 30 min with temperature at35℃. Both of Langmiur and Fruendlich equations were fitted the sorption data very well,and the theoretical saturated adsorption capacityies at 20℃,30℃,40℃ were 0. 1944,0. 2034 and 0. 2096 mg / g,respectively. The adsorption enthalpy was 8. 76 × 10- 3k J / mol and the entropy was- 45. 96 J / mol. K,and all the Gibbs free energy change were positive with the range of 4. 357- 9. 693 k J / mol. The adsorption of Cr( Ⅵ) by egg shell mainly was a physical monolayer and multi-layer process.
The egg shell was used for Cr( Ⅵ) adsorption from aqueous solution. The p H,shake time,dosage and temperature were investigated to explore the characteristics and mechanism of the adsorption process. The results showed that in the 100 m L solution system contained 1 mg / L Cr( Ⅵ),the adsorption process could be completed by egg shell within 30 min. The maximum adsorption capacity was observed at p H 2. 5. The equilibrium adsorption capacity was 0. 0917 mg / g when the dosage of egg shell was 1. 0 g. The optimal conditions of egg shell Cr( Ⅵ) adsorption were original p H 3. 0,egg shell dosage of 2. 0 g,shake time of 30 min with temperature at35℃. Both of Langmiur and Fruendlich equations were fitted the sorption data very well,and the theoretical saturated adsorption capacityies at 20℃,30℃,40℃ were 0. 1944,0. 2034 and 0. 2096 mg / g,respectively. The adsorption enthalpy was 8. 76 × 10- 3k J / mol and the entropy was- 45. 96 J / mol. K,and all the Gibbs free energy change were positive with the range of 4. 357- 9. 693 k J / mol. The adsorption of Cr( Ⅵ) by egg shell mainly was a physical monolayer and multi-layer process.
引文
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[17]Loukidou M.X.,Zouboulis A.I.,Karapantsios T.D.,et al.Equilibrium and kinetic modeling of chromium(VI)biosorption by Aeromonas caviae.Colloids and Surfaces A:Physicochemical and Engineering Aspects,2004,242(1-3):93-104
[18]Tong K.S.,Jain K.M.,Kassim A.A.Adsorption of copper ion from its aqueous solution by a novel biosorbent Uncaria gambir:Equilibrium,kinetics,and thermodynamic studies.Chemical Engineering Journal,2011,170(1):145-153
[2]Nataliya Z.,Zaitsev V.,Walcarius A.Chromium(VI)removal via reduction-sorption on bi-functional silica adsorbents.Journal of Hazardous Materials,2013,250-251:454-461
[3]爦ahan S.,Samac爦.,Karyal爦.,et al.Development of a new on-line system for the sequential speciation and determination of chromium species in various samples using a combination of chelating and ion exchange resins.Talanta,2014,120(3):391-397
[4]许友泽,杨志辉,向仁军.铬污染土壤的微生物修复.环境化学,2011,30(2):555-560Xu Youze,Yang Zhihui,Xiang Renjun.Reduction of chromium contaminated soils by microorgansim.Environmental Chemistry,2011,30(2):555-560(in Chinese)
[5]金文杰,薛晗,曾凡超,等.新型颗粒粉煤灰净水剂对六价铬的吸附.环境工程,2012,(30):1-4,35Jin Wenjie,Xue Han,Zeng Fanchao,et al.Adsorption of hexavalent charomium on new purifying agent of aranular fly ash.Enviromental Engineering,2012,(30):1-4,35(in Chinese)
[6]Tewari N.,Guha B.K.,Vasudevan P.et al.Adsorption study of hexavalent chromium by bentonite clay.Asian Journal of Chemistry,2005,17(4):2184-2190
[7]谭秋荀,张可方,赵焱,等.活性氧化铝对六价铬的吸附研究.环境科学与技术,2012,35(6):130-133Tan Qiuxun,Zhang Kefang,Zhao Yan,et al.Adsorption of hexavalent chromium by activated alumina.Environmental Science&Technology,2012,35(6):130-133(in Chinese)
[8]司伟达,王旭清,韩兆鹏,等.鸡蛋壳资源的再开发及研究进展.农产品加工,2014,295(10):36-37Si Weida,Wang Xuqing,Han Zhaopeng,et al.Progress of re-development and research on the eggshell resources.Farm Products Processing,2014,295(10):36-37(in Chinese)
[9]张浏,冯景伟,陈云峰,等.鸡蛋壳废料对水中磷的吸附性能研究.环境科学与技术,2011,34(6):67-71Zhang Liu,Feng Jingwei,Chen Yunfeng,et al.Adsorptive performance of phosphate onto eggshell waste.Environmental Science&Technology,2011,34(6):67-71(in Chinese)
[10]胡巧开,邓真丽,陈芳.鸡蛋壳-粉煤灰复合处理酸性含氟废水.粉煤灰综合利用,2005,58(1):45-46Hu Qiaokai,Deng Zhenli,Chen Fang.The treatment of acid flouride-containing wastewater by eggshell-fly ash system.Fly Ash Comprehensive Utilization,2005,58(1):45-46(in Chinese)
[11]谢永彬,刘敬勇,刘凯,等.甘蔗渣对水中Cr(Ⅵ)吸附性能的实验研究.水科学与工程技术,2012,(6):39-42Xie Yongbin,Liu Jingyong,Liu Kai,et al.Study on the biosorption of Cr(Ⅵ)in aqueous solution using bagasse.Water Sciences and Engineering Technology,2012,(6):39-42(in Chinese)
[12]马宏飞,韩秋菊,李薇,等.废茉莉花茶渣对Cr(Ⅵ)的吸附研究.科学技术与工程,2012,25(12):6554-6557Ma Hongfei,Han Qiuju,Li Wei,et al.Research on the adsorption of Cr(VI)with waste jasmine tea dust.Science Technology and Engineering,2012,25(12):6554-6557(in Chinese)
[13]范春辉,张颖超,花莉.粉煤灰基沸石对亚甲基蓝和Cr(Ⅲ)的共吸附行为-Ⅰ.吸附动力学和吸附热力学.环境工程学报,2012,6(11):3923-3927Fan Chunhui,Zhang Yinchao,Hua Li.Co-adsorption behavior of methylene blue(MB)and Cr(Ⅲ)on synthesized zeolite from fly ash:Ⅰ.Adsorption kinetics and thermodynamics.Chinese Journal of Environmental Engineering,2012,6(11):3923-3927(in Chinese)
[14]Ncibi M.C.,Mahjoub B.,Seffen M.,et al.Sorption dynamic investigation of chromium(VI)onto Posidonia oceanica fibres:Kinetic modelling using new generalized fractal equation.Biochemical Engineering Journal,2009,46(2):141-146
[15]赵芳,吴晓芙,张艳丽,等.固液相离子吸附体系中吸附剂浓度效应与Langmuir方程的适用性.环境化学,2007,26(3):335-338Zhao Fang,Wu Xiaofu,Zhang Yanli,et al.Adsorbent effect and applicability of langmuir equation for describing ion adsorption in liquid/solid systems.Environmental Chemistry,2007,26(3):335-338(in Chinese)
[16]Mustafa M.N.,Pierzynski G.M.The Freundlich adsorption isotherm constants and prediction of phosphorus bioavailability as affected by different phosphorus sources in two Kansas soils.Chemosphere,2014,99:72-80
[17]Loukidou M.X.,Zouboulis A.I.,Karapantsios T.D.,et al.Equilibrium and kinetic modeling of chromium(VI)biosorption by Aeromonas caviae.Colloids and Surfaces A:Physicochemical and Engineering Aspects,2004,242(1-3):93-104
[18]Tong K.S.,Jain K.M.,Kassim A.A.Adsorption of copper ion from its aqueous solution by a novel biosorbent Uncaria gambir:Equilibrium,kinetics,and thermodynamic studies.Chemical Engineering Journal,2011,170(1):145-153