文献类型： 外文期刊

作者： Liang, Ting ¹ ; Zhou, Guopeng ³ ; Chang, Danna ¹ ; Ma, Zhengbo ¹ ; Gao, Songjuan ⁴ ; Nie, Jun ⁵ ; Liao, Yulin ⁵ ; Lu, Yanhong ⁵ ; Fan, Hongli ¹ ; Zou, Chunqin ² ; Cao, Weidong ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arid & Semiarid A, Beijing 100081, Peoples R China

2.China Agr Univ, Coll Resources & Environm Sci, Key Lab Plant Soil Interact, Minist Educ,Natl Acad Agr Green Dev, Beijing 100193, Peoples R China

3.Anhui Agr Univ, Coll Resources & Environm, Anhui Prov Engn & Technol Res Ctr Intelligent Manu, Anhui Prov Key Lab Farmland Ecol Conservat & Nutri, Hefei 230036, Peoples R China

4.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China

5.Hunan Acad Agr Sci, Soil & Fertilizer Inst Hunan Prov, Changsha 410125, Peoples R China

关键词： Cd(II); Fe-modified biochar; DOM; FT-ICR MS; EEM-PARAFAC; Acidic functional groups

期刊名称：BIOCHAR （ 影响因子：12.7； 五年影响因子：13.1 ）

ISSN： 2524-7972

年卷期： 2024 年 6 卷 1 期

页码：

收录情况： SCI

摘要： Fe-modified biochar (FB) and co-using Chinese milk vetch and rice straw (MR) are two effective ways for mitigating the cadmium (Cd) contamination in paddy fields in southern China. Nevertheless, the effects of FB combined with MR on Cd passivation mechanism remain unclear. In the current study, the strengthening effects of FB induced by MR were found and the mechanisms of the extracted dissolved organic matter (DOM) from the co-decomposition of MR on Cd alleviation were investigated through pot experiment and adsorption experiment. Pot experiment demonstrated that co-incorporating FB and MR decreased available Cd by 23.1% and increased iron plaque concentration by 11.8%, resulting in a 34.7% reduction in Cd concentrations in brown rice compared with addition of FB. Furthermore, co-using FB and MR improved available nutrients in the soil. The molecular characteristics of DOM derived from the decomposition of MR (DOM-MR) were analyzed by fluorescence excitation emission matrix spectroscopy-parallel factor analysis (EEM-PARAFAC) and Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS). Results showed that lignin/carboxylic-rich alicyclic molecules and protein/amino sugar were the main compounds, potentially involved in the Cd binding. Adsorption experiments revealed that the addition of DOM-MR improved the functional groups, specific surface area, and negative charges of FB, inducing the strengthening of both physisorption and chemisorption of Cd(II). The maximum adsorption capacity of Fe-modified biochar after adding DOM-MR was 634 mg g-1, 1.30 times that without the addition of DOM-MR. This study suggested that co-incorporating MR, and FB could serve as an innovative practice for simultaneous Cd remediation and soil fertilization in Cd-polluted paddy fields. It also provided valuable insights and basis that DOM-MR could optimize the performances of Fe-modified biochar and enhance its potential for Cd immobilization. Chinese milk vetch and rice straw strengthened the Cd remediation by biochar. Soil DOM was the key influencing factor on soil Cd immobilization. DOM optimized the properties of biochar and produced richer functional groups. The combination of DOM and biochar had a higher specific surface area than biochar alone. DOM strengthened the physisorption and chemisorption capacities of Cd(II) on biochar.