Research Progress of Chemical Fixation of Heavy Metals in Soil by Silicate and Phosphate
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1 ENVIRONMENTAL SCIENCE AND MANAGEMENT X53 A Research Progress of Chemical Fixation of Heavy Metals in Soil by Silicate and Phosphate Xu Chao 1 Chen Bingrui 1 Lv Gaoming 1 Zhou Hang 2 Zeng Min 3 Liao Bohan 2 1. College of Forestry Central South University of Forestry and Technology Changsha China 2. Biotechnology Core Facilities Central South University of Forestry and Technology Changsha China 3. Science and Technology Bureau Changsha China Abstract According to the heavy metal ion migration transformation rule the heavy metal pollution in soil can be treated by physical chemical biological methods and each repair method has their advantages and disadvantages. Environmental mineralogical method has the advantages of low cost and high efficiency. This paper describes two kinds of representative environmental minerals silicate and phosphate from the performance of silicate and phosphate mineral properties reaction mechanism and effect of heavy metal ions on soil survey of silicates and phosphates research progress in remediation of heavy metal pollution of soil. It also expounded the silicates and phosphates on the different effects of heavy metal ions as well as the factors affecting its role and proposed current problems and deficiencies. Key words silicate phosphate soil remediation heavy metal pollution
2 c 6-7 b Si O SiO 2 Al 2 O 3 Fe 2 O 3 CaO MgO Al 2 O 3 2SiO 2 α - β - 30 ph PbAl 3 PO 4 2 OH 5 H 2 O logksp Pb 5 PO 4 3 Cl 9 165
3 97% 96% 98% Basta McGowen 3 10 g kg % 95. 8% 94. 6% Pb > Cu > Cd > Zn % ~ 100% Al 3 + Si 4 + Na + K + 40 Ca 2 + Mg 2 + NaOH NH + 4 Garcia Sancheza NaP1 21 Zn Cd Mn Co Cu Pb Zn Cd Cr Cr > Cu > Zn > Cd > Pb Cr > > Zn > Cu > Cd Cr > Zn > Cd > Cu > Pb 13 Oreraetal 14 Cd 2 + > Cu 2 + > Zn 2 + > Ni 2 + ph Hg 2 + > Ag + > Cd 2 + Cd 2 + > 4. 1 ph Ag + > Hg Zn > Cu > Pb ph ph 23 ph Cr 6 + > Cu 2 + > Pb 2 + H + > Cd ph 3. 2 ph K sp ph Cao 17 11% ~ 55% 53% % 15% 18 Wang 19 99% 166
4 5. 2 SO 2-4 S 2 - Chatteriee 5. 3 ph 2 Eh 4. 3 / / 5. 4 ph 2 1 Zn J D Zn Cd 3. D Cu Pb 4 Barter R M. Zeolites and clay minerals as sorbents and / molecular sieves M. New York Academic Press J Ma Q Y Samuel J T Logan et a1. In situ lead immobilization by apatite J. Environ Sci Technol Cu 2 + > Zn 2 + > Ni 2 + > Cd 2 + Coles Pb Cd 2 + < 2 mmol L X D Cao Rhue D R Chen S B et a1. Mechanisms of lead copper and zinc retention by phosphate rock J. Environ 25 Pollut Ryan J A Zhang P C Hesterberg D Sayers D E Pb 2 + > Cu 2 + > Zn 2 + > Mn 2 + > Cd 2 + Chou J. Formation of chloropyromorphite in a lead - contaminated soil amended with hydroxyapatite J. Environ Sci Technol J Cheng S F Zeng Y H. In - situ immobilization of cadmium and lead by different amendments in two contaminated soils J. Water Air Soil Pollut A G Sanchez E A Ayusot and O J Bias. Sorption of heavy metals from industrial waste water by low - contmineral silicates J. Clay Minerals P Misaelides A Godelitsas V Charistos. Heavy metal uptake byzeoliferous rocks form Metaxades Thrace Greece 167
5 exploratorystudy J. J Radioanalytical Nuclear Chem and Contaminated Soils Using Phosphate Rocks J. Environ Sci J Steenbruggen G Holiman G. The Synthesis of Zeolites from Fly Ashand The Properties of the Zeolite Products J. J Geochemical Exploration Davidovits J. Recent progresses in concretes for nuclearwaste and uranium waste containment J. Concrete International Davidovits J. Geopolymerice concretes for environmental protection J. Concrete International Cao R X lena Q M Chen M et al. Phosphate - include metal immobilization in a contaminated site J. Evironm Pollut Bradl H. B. Adsorption of heavy metal ions on soils and soils constituents J. J Colloid Interface Sci Halim M Conte P Piccolo A. Potential availability of heavy metals to phytoextraction from contaminated soils induced by exogenous humanic substances J. Chemosphere Ma Q Y. Lead immobilization from Aqueous Solutions Technol Kucharskil R Nowosielska S Kowski M L et al. The use of indigenous plant species and calcium phosphate for the stabilization of highly metal - polluted sites in southern Poland J. Plant and Soil J Elzahabi M Yong R N. ph influence on sorption characteristics of heavy metal in the vadose zone J. Engin Geol J Coles C A Yong R N. Aspects of kaolinite characterization and retention of Pb and Cd J. Applied Clay Sci Sezer G A Turkmenoglu A G Gokturk E H. Mineralogical and sorption characteristics of Ankara clay as a landfill liner J. Applied Geochem 檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲檲 131 u rel I = 槡 u 2 rel A + u 2 rel M + u 2 rel V 3 + u 2 rel V 1 + u 2 rel V 4 + u 2 rel C + u 2 rel V = u I = u rel I I = mg /L = mg /L 5 k = 2 95% U = ku I = = mg /L c = ± mg /L 3 / mg /L ± mg /L 1 S. JJF S. GB S. JJG
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