Intercalation and separation of isomeric nitrophenols using the anionic clay, Mg2Al(OH)6(CO3)0.5·nH2O and the structurally related layered hydroxy salt, Ni3Zn2(OH)8(CH3COO)2·mH2O

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL Applied Clay Science Pub Date : 2023-10-01 DOI:10.1016/j.clay.2023.107053

Bhojaraj , C. Nethravathi , Michael Rajamathi

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Abstract

Intercalative sorption of isomeric nitrophenolates (NP) was investigated in two different layered hydroxide materials - anionic clay, magnesium aluminium layered double hydroxide (MgAl-LDH) through reconstructive mechanism and the structurally related layered hydroxy salt, Ni₃Zn₂(OH)₈(CH₃COO)₂·mH₂O (NiZn-LHS) through ion-exchange. Intercalation of NP isomers was confirmed by powder X-ray diffraction and infrared spectroscopy. The NP uptake by the layered hydroxide materials was quantified by high performance liquid chromatography. Both the layered hydroxide materials exhibit selective intercalation from the nitrophenolate mixtures. The order of preference is 4-NP > > 2-NP > 3-NP in MgAl-LDH and 4-NP > 2-NP > > 3-NP in NiZn-LHS. The bias in intercalation could be attributed to (1) the concentration of the phenolate ions influenced by the pKa of the isomer and (2) extent of H-bonding of the nitro group of the isomer with the hydroxide slabs. The 4-isomer with lower pKa and better H-bonding with the adjacent hydroxide slabs is preferentially intercalated. The anionic clays can be used to sorb out nitrophenols as well as separate them from their mixtures.

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用阴离子粘土Mg2Al(OH)6(CO3)0.5·nH2O和结构相关的层状羟基盐Ni3Zn2(OH)8(CH3COO)2·mH2O插层分离异构体硝基苯酚

研究了异构体硝基苯酚(NP)在两种不同的层状氢氧化物材料上的插层吸附，即阴离子粘土、镁铝层状双氢氧化物(MgAl-LDH)和结构相关的层状羟基盐Ni3Zn2(OH)8(CH3COO)2·mH2O (NiZn-LHS)通过离子交换作用。通过粉末x射线衍射和红外光谱分析证实了NP异构体的插层作用。采用高效液相色谱法定量了层状氢氧化物材料对NP的吸收。两种层状氢氧化物材料均表现出从硝基酚混合物中选择性插层。优先顺序为4-NP >比;2-NP祝辞MgAl-LDH中的3-NP和4-NP >2-NP祝辞比;NiZn-LHS中的3-NP。这种插层偏差可归因于(1)同分异构体的pKa对酚酸离子浓度的影响;(2)同分异构体的硝基与氢氧化物板的氢键程度。pKa较低、与相邻氢氧根板氢键较好的4-异构体优先插层。阴离子粘土可以用来吸收硝基酚，也可以把它们从混合物中分离出来。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...