Effect of ferrolysis and organic matter accumulation on chromate adsorption characteristics of an Oxisol-derived paddy soil

被引:7
|
作者
Hua, Hui [1 ,2 ]
Zhao, Zhenjie [1 ]
Xu, Renkou [1 ]
Chang, E. [3 ]
Fang, Di [4 ]
Dong, Ying [1 ]
Hong, Zhineng [1 ]
Shi, Renyong [1 ]
Jiang, Jun [1 ]
机构
[1] Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, POB 821, Nanjing, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Southeast Univ, Inst Informat Sci & Technol, Nanjing 210096, Peoples R China
[4] Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China
基金
中国国家自然科学基金;
关键词
Oxisol; Paddy soil; Fe (hydro)oxides; Chromate adsorption and desorption; Adsorption mechanisms; VARIABLE-CHARGE SOILS; CULTIVATION SIGNIFICANTLY ALTERS; STIRRED FLOW CHAMBER; DESORPTION; PHOSPHATE; KINETICS; IRON; SORPTION; REMOVAL; BIOCHAR;
D O I
10.1016/j.scitotenv.2020.140868
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
How paddy cultivation influences the adsorption isotherms, envelopes, and the kinetics of hexavalent chromate (Cr(VI)) on Fe (hydro)oxide-rich paddy soil, as well as the mechanisms involved, remain largely unaddressed. To this end, the Cr(VI) adsorption characteristics on a paddy soil, in comparison with its parent upland Oxisol, were studied. The results showed that Cr(VI) adsorption capacities (Q(m)(ad)) were higher in the surface Oxisol than in the same layer of paddy soil. The Q(m)(ad) increased by 18.0% and 413% after removal of soil organic matter (SOM) from the surface Oxisol and paddy soil layers, respectively, indicating that Cr(Vl) adsorption was considerably inhibited by SOM. The adsorption and desorption isotherms demonstrated that non-electrostatic adsorption was mainly responsible for Cr(VI) adsorption, accounting for 59.37%-83.42% of Cr(VI) adsorption capacities. The negative shift of the zeta potential-pH curves with Cr(VI) loading further corroborated the finding that non-electrostatic adsorption is largely responsible for Cr(VI) retention. Cr(VI) adsorption at equilibrium, obtained by the stirred flow chamber technique, and the free Fe (hydro)oxides (Fe-d) contents were in the same order, suggesting that Fe d are the main adsorbents for Cr(Vl). Therefore, paddy cultivation has had a profound impact on the electrochemical properties of the Oxisol and on subsequent Cr(VI) adsorption characteristics.
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页数:9
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