Mechanism and kinetics of aluminum dissolution during copper sorption by acidity paddy soil in South China

Soil aggregates were prepared from a bulk soil collected from paddy soil in the Taihu Lake region and aluminum（Al） dissolution, solution p H changes during copper（Cu2＋） sorption were investigated with static sorption and magnetic stirring. Kinetics of Cu2＋sorption and Al dissolution were also studie...

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Published inJournal of environmental sciences (China) Vol. 34; no. 8; pp. 100 - 106
Main Authors Liu, Peiya, Li, Yujiao, Wen, Qinliang, Dong, Changxun, Pan, Genxing
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.08.2015
Subjects
Adsorption
Aggregate
Agriculture
Aluminum - chemistry
Aluminum dissolution
China
Copper - chemistry
Cu2
Cu2 + sorption
Hydrogen-Ion Concentration
Kinetics
Oryza - growth & development
Soil - chemistry
Soil Pollutants - chemistry
Solubility
吸附过程
土壤团聚体
机理
溶解动力学
酸性水稻土
铜吸附
铝溶出
China, People's Rep., Tai Hu L
China, People's Rep
pH
Aggregate
Cu2+ sorption
Aluminum dissolution
Cu(2+) sorption
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Summary:Soil aggregates were prepared from a bulk soil collected from paddy soil in the Taihu Lake region and aluminum（Al） dissolution, solution p H changes during copper（Cu2＋） sorption were investigated with static sorption and magnetic stirring. Kinetics of Cu2＋sorption and Al dissolution were also studied by magnetic stirring method. No Al dissolution was observed until Cu2＋sorption was greater than a certain value, which was 632, 450, 601 and674 mg/kg for sand, clay, silt, and coarse silt fractions, respectively. Aluminum dissolution increased with increasing Cu2＋sorption and decreasing solution p H. An amount of dissolved Al showed a significant positive correlation with non-specific sorption of Cu2＋（R2〉 0.97）, and it was still good under different p H values（R2〉 0.95）. Copper sorption significantly decreased solution p H. The magnitude of solution p H decline increased as Cu2＋sorption and Al dissolution increased. The sand and clay fraction had a less Al dissolution and p H drop due to the higher ferric oxide, Al oxide and organic matter contents. After sorption reaction for half an hour, the Cu2＋sorption progress reached more than 90% while the Al dissolution progress was only 40%, and lagged behind the Cu2＋sorption. It indicated that aluminum dissolution is associated with non-specific sorption.
Bibliography:Aggregate Cu2＋ sorption Aluminum dissolution pH
Soil aggregates were prepared from a bulk soil collected from paddy soil in the Taihu Lake region and aluminum（Al） dissolution, solution p H changes during copper（Cu2＋） sorption were investigated with static sorption and magnetic stirring. Kinetics of Cu2＋sorption and Al dissolution were also studied by magnetic stirring method. No Al dissolution was observed until Cu2＋sorption was greater than a certain value, which was 632, 450, 601 and674 mg/kg for sand, clay, silt, and coarse silt fractions, respectively. Aluminum dissolution increased with increasing Cu2＋sorption and decreasing solution p H. An amount of dissolved Al showed a significant positive correlation with non-specific sorption of Cu2＋（R2〉 0.97）, and it was still good under different p H values（R2〉 0.95）. Copper sorption significantly decreased solution p H. The magnitude of solution p H decline increased as Cu2＋sorption and Al dissolution increased. The sand and clay fraction had a less Al dissolution and p H drop due to the higher ferric oxide, Al oxide and organic matter contents. After sorption reaction for half an hour, the Cu2＋sorption progress reached more than 90% while the Al dissolution progress was only 40%, and lagged behind the Cu2＋sorption. It indicated that aluminum dissolution is associated with non-specific sorption.
11-2629/X
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1001-0742
1878-7320
DOI:10.1016/j.jes.2015.02.008