Sorption mechanisms of sulfamethazine to soil humin and its subfractions after sequential treatments.
Sorption mechanisms of sulfamethazine to soil humin and its subfractions after sequential treatments.
复制标题
DOI：
10.1016/j.envpol.2016.11.073
复制
发表时间：
2017-02
影响因子：
8.9
通讯作者：
Xiaoying Guo;Xiaofang Shen;Meng Zhang-;Haiyun Zhang;Weixiao Chen;Hui Wang;A. Koelmans;G. Cornelissen;S. Tao;Xilong Wang
中科院分区：
文献类型：
--
作者：
Xiaoying Guo;Xiaofang Shen;Meng Zhang-;Haiyun Zhang;Weixiao Chen;Hui Wang;A. Koelmans;G. Cornelissen;S. Tao;Xilong Wang
研究了从泥炭土及其亚组分中分离出的抗生素磺胺乙嗪（SMT）对人敏（HM）的吸附机理。HM处理包括去除灰分、o -烷基碳、脂质和木质素成分。HF/HCl脱灰处理去除了大量矿物（主要是硅酸盐），释放了一部分先前被阻断的疏水碳吸附域，使SMT的吸附性提高了33.3%。酸水解去o -烷基碳处理大大降低了HM样品的极性，从而减弱了吸附剂与水在界面上通过h键的相互作用，留下了更有效的吸附位点。范德华力和π-π相互作用等机制对SMT的吸附作用在2.04-2.50的倍数范围内增强。采用改进的索氏萃取/酸水解去除脂质/木质素组分后，计算有机碳含量归一化吸附增强指数eoc。结果表明，SMT的eoc -脂质（16.9%）高于eoc -木质素（10.1%），表明去除单位有机碳质量的脂质导致吸附强度的提高高于木质素。随着各组分逐渐从HM中去除，残余HM样品对SMT的吸附强度和等温非线性逐渐增强。HM样品SMT的kocvalues与其芳香碳含量呈正相关，表明HM中山梨酸苯环与芳香结构域之间的π-π电子给体-受体相互作用在其相互作用中起着重要作用。
Sorption mechanisms of an antibiotic sulfamethazine (SMT) to humin (HM) isolated from a peat soil and its subfractions after sequential treatments were examined. The treatments of HM included removal of ash, O-alkyl carbon, lipid, and lignin components. The HF/HCl de-ashing treatment removed a large amount of minerals (mainly silicates), releasing a fraction of hydrophobic carbon sorption domains that previously were blocked, increasing the sorption of SMT by 33.3%. The de-O-alkyl carbon treatment through acid hydrolysis greatly reduced polarity of HM samples, thus weakening the interaction between sorbents with water at the interfaces via H-bonding, leaving more effective sorption sites. Sorption of SMT via mechanisms such as van der Waals forces and π-π interactions was enhanced by factors of 2.04–2.50. After removing the lipid/lignin component with the improved Soxhlet extraction/acid hydrolysis, the organic carbon content-normalized sorption enhancement indexEocwas calculated. The results demonstrated that theEoc-lipidfor SMT (16.9%) was higher thanEoc-lignin(10.1%), implying that removal of unit organic carbon mass of lipid led to a higher increase in sorption strength than that of lignin. As each component was progressively removed from HM, the sorption strength and isotherm nonlinearity of the residual HM samples for SMT were gradually enhanced. TheKocvalues of SMT by HM samples were positively correlated with their aromatic carbon contents, implying that π-π electron donor-acceptor interactions between the benzene ring of sorbate and the aromatic domains in HM played a significant role in their interactions.