MWCNTs改性凹凸棒土对水中Cr (VI)的吸附研究

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Abstract

As a kind of cheap natural clay, the attapulgite (APT) was modified by carboxyl multi-walled carbon nanotubes (MWCNTs). The MWCNTs/attapulgite composites were characterized by XRD, FT-IR and FE-SEM. The results indicated that the MWCNTs/APT composites were successfully synthesized by the modification reaction with MWCNTs on APT. The isothermal adsorption experiments of Cr(VI) on the MWCNTs/APT composites showed that the maximum adsorption capacity was obtained over 14.9mg/g under pH of 2 and adsorption time for 12h at 293.15K. The adsorption of Cr(VI) on the MWCNTs/APT composites followed a pseudo-first-order kinetic model and the experimental data were best fitted the Langmuir isotherm model. The negative values of ΔG^o and the positive values of ΔH^o and ΔS^o indicated that it was spontaneous, endothermic and entropy-increasing nature of this adsorption process. Compared with pure APT clay and carboxyl MWCNTs, such MWCNTs/APT composites could effectively improve the adsorption performance for Cr(VI), and would have a good application prospect in the wastewater treatment containing chromium.

Key words： attapulgite multi-walled carbon nanotubes composites chromium (VI) adsorption

Received: 09 October 2016

PACS:	X703
	X131.2
	TQ028

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	Articles by authors
	WANG Cai-yun
	LIU Lian
	LI Chuang
	JIANG Ting-ting
	CHEN Wei-jia
	WANG Li-hong
	ZHANG Xiao-liang

Cite this article:

WANG Cai-yun,LIU Lian,LI Chuang等. Adsorption of Cr(VI) on the MWCNTs/attapulgite composites[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(6): 2179-2186.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I6/2179

[1]	Bhattacharya A K, Naiya T K, Mandal S N, et al. Adsorption, kinetics and equilibrium studies on removal of Cr(VI) from aqueous solutions using different low-cost adsorbents[J]. Chemical Engineering Journal, 2008,137(3):529-541.
[2]	刘新,冷言冰,谷仕艳,等.油菜秸杆外壳对水溶液中六价铬的吸附作用[J]. 中国环境科学, 2015,35(6):1740-1748.
[3]	Jung C, Heo J, Han J, et al. Hexavalent chromium removal by various adsorbents:Powdered activated carbon, chitosan, and single/multi-walled carbon nanotubes[J]. Separation and Purification Technology, 2013,106(6):63-71.
[4]	秦泽敏,董黎明,刘平,等.零价纳米铁吸附去除水中六价铬的研究[J]. 中国环境科学, 2014,34(12):3106-3111.
[5]	Gadhave A, Waghmare J. Removal of heavy metal Ions from wastewater by carbon nanotubes (CNTs)[J]. International Journal of Engineering Sciences & Research Technology, 2014,3(7):226-236.
[6]	杜珮雯,党宏钰,张永祥.改性沸石和铁粉的复合材料处理水中六价铬的研究[J]. 中国环境科学,2015,35(5):1384-1390.
[7]	Li R J, Liu L F, Yang F L. Removal of aqueous Hg(Ⅱ) and Cr(VI) using phytic acid doped polyaniline/cellulose acetate composite membrane[J]. Journal of Hazardous Materials, 2014,280:20-30.
[8]	聂宁,丁远昭,李喜青.制备斜发沸石和零价铁复合材料处理水中的六价铬污染[J]. 中国环境科学, 2013,33(3):443-447
[9]	Mu B, Wang A Q. Adsorption of dyes onto palygorskite and its composites:A review[J]. Journal of Environmental Chemical Engineering, 2016,4(1):1274-1294.
[10]	孙楠,田伟伟,张颖.HCPA-UF-MBR组合工艺处理低温高色高氨氮水源水研究[J]. 中国环境科学, 2015,35(12):3620-3627.
[11]	Li M S, Zhou S Y, Xue A L, et al. Fabrication of porous attapulgite hollow fiber membranes for liquid filtration[J]. Materials Letters, 2015,161:132-135.
[12]	Zhang Z F,Wang W B,Wang A Q. Highly effective removal of methylene blue using functionalized attapulgite via hydrothermal process[J]. Journal of Environmental Sciences, 2015,33(7):106-115.
[13]	高淑玲,杨翠玲,罗鑫圣,等.坡缕石黏土污泥对水相中亚甲基蓝吸附研究[J]. 中国环境科学, 2014,34(1):78-84.
[14]	Luo C, Tian Z, Yang B, et al. Manganese dioxide/iron oxide/acid oxidized multi-walled carbon nanotube magnetic nanocomposite for enhanced hexavalent chromium removal[J]. Chemical Engineering Journal, 2013,234:256-265.
[15]	Lv X, Xu J, Jiang G M, et al. Removal of chromium (VI) from wastewater by nanoscale zero-valent iron particles supported on multiwalled carbon nanotubes[J]. Chemosphere, 2011,85(7):1204-1209.
[16]	Selen V, Güler O, Özer D, et al. Synthesized multi-walled carbon nanotubes as a potential adsorbent for the removal of methylene blue dye:kinetics, isotherms, and thermodynamics[J]. Desalination and Water Treatment, 2015,57(19):1-13.
[17]	Atieh M A. Removal of Chromium (VI) from polluted water using carbon nanotubes supported with activated carbon[J]. Procedia Environmental Sciences, 2011,4:281-293.
[18]	Chen L F, Liang H W, Lu Y, et al. Synthesis of an attapulgite clay@carbon nanocomposite adsorbent by a hydrothermal carbonization process and their application in the removal of toxic metal ions from water[J]. Langmuir, 2011,27(14):8998-9004.
[19]	Liu W J, Yang T, Xu J, et al. Preparation and adsorption property of attapulgite/carbon nanocomposite[J]. Environmental Progress & Sustainable Energy, 2015,34(2):437-444.
[20]	Mubarak N M, Thines R K, Sajuni N R, et al. Adsorption of chromium (VI) on functionalized and non-functionalized carbon nanotubes[J]. Korean Journal of Chemical Engineering, 2014, 31(9):1582-1591.
[21]	王彬,龚继来,杨春平,等.磁性多壁碳纳米管吸附去除水中罗丹明B的研究[J]. 中国环境科学, 2008,28(11):1009-1013.
[22]	Kumar A S K, Jiang S J, Tseng W L. Effective adsorption of chromium(VI)/Cr(Ⅲ) from aqueous solution using ionic liquid functionalized multiwalled carbon nanotubes as a super sorbent[J]. Journal of Materials Chemistry A, 2015,3:7044-7057.
[23]	Quan G X, Zhang J, Guo J, et al. Removal of Cr(VI) from aqueous solution by nanoscale zero-valent iron grafted on acid-activated attapulgite[J]. Water Air Soil Pollution, 2014,225(6):1-11.
[24]	Cui H, Qian Y, Li Q, et al. Fast removal of Hg(Ⅱ) ions from aqueous solution by amine-modified attapulgite[J]. Applied Clay Science, 2013,72(2):84-90.
[25]	Wang X H, Wang C Y. Chitosan-poly(vinyl alcohol)/attapulgite nanocomposites for copper(Ⅱ) ions removal:pH dependence and adsorption mechanisms[J]. Colloids and Surfaces A, 2016, 500:186-194.
[26]	Fan Q H, Shao D D, Hu J, et al. Comparison of Ni2+ sorption to bare and ACT-graft attapulgites:effect of pH, temperature and foreign ions[J]. Surface Science, 2008,602:778-785.
[27]	Tao L, Song X W, Yuan J L, et al. Adsorption of Cr(VI) from aqueous solution by purified attapulgite[J]. Advanced Materials Research, 2014,1051:583-587.