Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Journal of Safety and Environment》 2007-04
Add to Favorite Get Latest Update

Adsorption of Pb~(2+) by crystal δ-manganese dioxide prepared by hydrothermal method

ZHU Li-jun1,ZHANG Jin-chi2,ZAI De-xin1,CHAI Jia-jue2,WANG Xian2(1 Department of Chemistry and Material Science,Information Science and Technology College,Nanjing Forest University,Nanjing 210037,China;2 Department of Environment Ecology,Forest Resources and Environment College,Nanjing Forest University,Nanjing 210037,China)  
The present article takes as its aim the introduction to our renovated hydrothermal method in preparing δ-MnO2 along with its study on the adsorption of Pb2+.At the same time,the paper has also discussed the effect of pH and salty concentration on the adsorption in comparison with the non-crystal manganese.Our experimental results have shown that the given method can be made highly successful in synthesizing crystal δ-manganese dioxide free from impurities.When samples produced with our method were tested by way of X-ray diffraction and infrared spectrum,it is found that the δ-MnO2 crystal measurement is worse with small grain diameters.The samples δ-MnO2 produced in our innovated method display a lot of surface hydroxyl functional groups(Mn—OH),which prove to adsorb heavy metal Pb2+ of different initial densities at the temperature of 25 ℃.The experimental results of ours also indicate that the Pb2+ adsorption is likely to increase with initial density comparatively increased.To be exact,when the initial density150 mg/L,the Pb2+ adsorption would increase sharply.And,then,when the initial density 210 mg/L and the Pb2+ adsorptiongets to saturation,the experimental data proves to agree with Langmuir equation,Freundlich equation and Temkin equation,with the best model in correspondence with the isothermal adsorption data of Pb2+ as in the Temkin-equation.Under the same experimental conditions,the adsorptive capacities of the δ-MnO2 pair of Pb2+ prove to be stronger than the non-crystal manganese dioxide.Last of all,compared with non-crystal manganese under the same condition,the variation of the two adsorbents in absorption efficiency trends to be slight.To the same adsorbent,the increase of pH may result in a corresponding increase of the adsorption efficiency.To the δ-MnO2,on the condition of 1 pH4.5,the adsorption efficiency may increase with the increase of pH when pH 5.22,and the Pb2+ totally adsorbed.On the other hand,when 0.05salty concentration0.15,the adsorption efficiency would increase with the increase of salty concentration,and then would stand still at 0.15.However,when the salty concentration0.15,the adsorption efficiency would decrease as the salty concentration increases.
【Fund】: 江苏省重点自然科学基金资助项目(BK2001208);; 南京市科技发展资助项目(20012117)
【CateGory Index】: X132
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
Chinese Journal Full-text Database 1 Hits
1 LIANG Hui-feng1, ZHANG Meng-cun2(1.Department of Chemistry,Xingtai College,Xingtai 054001,China;2.Department of Resource and Environment Engineering, Xingtai Vocationcal Technological College, Xingtai 054035, China);Effect of pH Value on Adsorption and Desorption of Cd~(2+) at δ-MnO_2[J];Environmental Science & Technology;2009-04
Chinese Journal Full-text Database 10 Hits
1 LANG Hui-feng~(1,2), MA Zi-chuan~1, ZHANG Jie~2, WEI Yu~1(1 College of Chemistry, Hebei Normal University, Shijiazhuang 050016, China; 2 Department of Chemistry, Xingtai College, Xingtai 054001, Hebei, China);Adsorption of As(Ⅴ) by nascent manganese dioxide[J];Journal of Safety and Environment;2005-01
2 ZHAO Dongjun~(1)) LU Anhuai WANG Lijuan ZHENG Xishen LIU Rui GUO Yanjun(School of Earth and Space Sciences, Peking University, Beijing, 100871; ()~(1)));Mineralogical Characteristics Study of Natural Cryptomelane in the Xialei Manganese Deposit, Guangxi[J];Acta Scicentiarum Naturalum Universitis Pekinesis;2005-06
3 XIA Xi(Institute of Applied Chemistry,Xinjiang University, Urumqi,Xinjiang 830046,China);Crystal structure,preparation and discharge performancefor manganese dioxides and related manganese oxides(Ⅰ)[J];Battery Bimonthly;2004-06
4 XIA Xi(Institute of Applied Chemistry,Xinjiang University, Urumqi,Xinjiang 830046,China);Crystal structure,preparation and discharge performance for manganese dioxides and related manganese oxides(Ⅱ)[J];Battery Bimonthly;2005-01
5 CHEN Jian\|lin\+1, MA Wei\|lin\+1, HAN Xi\|qiu\+1, WANG Ji\|qing\+2,WANG Ying\+1 (1.Second Institute of Oceanography, SOA, Hangzhou 310012, China; 2.Institute of Nuclear Research, Shanghai 201800, China);A brief description of the polymetallic nodules and their relevant factors in the East Pacific Ocean[J];DONGHAI MARINE SCIENCE;1999-03
6 MA Wei\|lin\+\{1,2\},JIN Xiang\|long\+2,CHEN Jian\|lin\+2,SU Xin\+3,ZHANG Wei\|yan\+2 (1 Earth Science Department of Zhejiang University,Hangzhou 310027,China;2 Second Institute of Oceanography SOA, Key Lab of Submarine Geoscience of SOA,Hangzhou 31001;Geological characteristics of Co-rich crusts from the Mid-Pacific Seamounts Area[J];Donghai Marine Science;2002-03
7 LUAN Xi-wu(Institute of Oceanology,the Chinese Academy of Sciences,Qingdao 266071,China);Cobalt-rich ferromanganese crusts formation——Evidences of hydrogenous origin[J];Journal of Marine Sciences;2006-02
8 Chu Wei * Liu Deyao You Jinkua Yang Yong Lin Zugeng (State Key Laboratory for Physical Chemistry of Solid Surface, Inst. of Phys. Chem.,Dept.of Chem.,Xiamen Univ.,Xiamen 361005);Structural and Electrochemical Studies on Todorokite/Vernadite as Cathodes for Rechargeable Lithium Ion Batteries[J];ELECTROCHEMISTRY;1999-01
9 FENG Xiong han1, LIU Fan1, TAN Wen feng1, Wang Yi jun1, LIU Xiang wen2(1. Key Laboratory of Subtropical Soil Resources and Environment, Huazhong Agriculture University, Wuhan 430070, China; 2. Analytical Center of China University of Geosciences, Wuha;The factors influencing synthesis of birnessite in alkali media[J];Geochimica;2002-05
10 PAN Jiahua LIU Shuqin (Institute of Mineral Resources, CAGS,Beijing,100037) Eric DeCarlo (Department of Oceanography, Hawaii University, USA);The Effects of Marine Phospharization on Element Concentration of Cobalt-rich Crusts[J];Acta Geosicientia Sinica;2002-05
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved