Abstract：
:In this study, a surface chemical-modified rice husk biochar with abundant amino groups and disulfide bonds for the removal of cadmium was prepared using cystamine dihydrochloride as a modification ligand and glutaraldehyde as a crosslinker. The biochars were characterized by Fourier transform infrared spectrometry (FTIR), elemental analysis, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetry analysis (TGA), and nitrogen sorption (BET) before and after modification. The adsorption properties of the modified biochars for Cd (II) were investigated in detail via adsorption isotherm models, adsorption kinetics models, and selective adsorption experiments. The surfaces of the cystamine-modified biochars with granular nanopolymers of sufficient functional groups of primary amine and disulfide linkage rendered the biochar surface more conducive to electrostatic attraction and surface complexation. The theoretical maximum adsorption capacity of the modified biochars (81.02 mg g-1) was almost 10-fold greater than that of the raw biochars (8.347 mg g-1) for Cd (II). Besides, the cystamine-modified biochars had a better affinity for Cd (II) compared to other heavy metals (Zn, As, Cd, Co, Ni, Cr), showing six-fold greater affinity for Cd (II) than Zn2+. The results of this study indicate that the modification of biochars derived from rice husks shows great potential in the removal of Cd (II) from contaminated water.
journal_name
Int J Mol Scijournal_title
International journal of molecular sciencesauthors
Chen R,Zhao X,Jiao J,Li Y,Wei Mdoi
10.3390/ijms20071775subject
Has Abstractpub_date
2019-04-10 00:00:00issue
7issn
1422-0067pii
ijms20071775journal_volume
20pub_type
杂志文章abstract：:Arterial calcification, the deposition of calcium-phosphate crystals in the extracellular matrix, resembles physiological bone mineralization. It is well-known that extracellular nucleotides regulate bone homeostasis raising an emerging interest in the role of these molecules on arterial calcification. The purinergic ...
journal_title：International journal of molecular sciences
pub_type： 杂志文章,评审
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更新日期：2020-10-15 00:00:00
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journal_title：International journal of molecular sciences
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journal_title：International journal of molecular sciences
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journal_title：International journal of molecular sciences
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更新日期：2020-08-11 00:00:00
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journal_title：International journal of molecular sciences
pub_type： 杂志文章,评审
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更新日期：2018-12-11 00:00:00
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journal_title：International journal of molecular sciences
pub_type： 杂志文章
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journal_title：International journal of molecular sciences
pub_type： 杂志文章
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journal_title：International journal of molecular sciences
pub_type： 杂志文章,评审
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更新日期：2015-06-19 00:00:00
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journal_title：International journal of molecular sciences
pub_type： 临床试验,杂志文章
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更新日期：2019-12-01 00:00:00
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