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首页> 外文期刊>Colloids and Surfaces, A. Physicochemical and Engineering Aspects >cl- poly(acrylic acid-co- N-vinyl imidazole) hydrogel]]>
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cl- poly(acrylic acid-co- N-vinyl imidazole) hydrogel]]>

机译：<！[CDATA [CDATA [CDATA [CDATAS [PH响应于来自其水溶液的有机染料的响应吸附/解吸研究，通过KATIRA GUM- CL - 聚乙烯>斜体>（丙烯酸 -Co- n - 乙烯基咪唑）水凝胶]]>

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摘要

A pH responsive hydrogel was prepared by grafting of a mixture of acrylic acid (AA) andN-vinyl imidazole (NVI) onto the katira gum (KG) by free radical co-polymerization technique using KPS as initiator andN,N′-methylene-bis-acrylamide (MBA) as a cross-linking agent in water medium. The pH sensitive hydrogel was characterized by FTIR, XRD and SEM analysis. Swelling studies with water were carried out at different pH in which hydrogel showed two maxima at pH?=?4.5 and at pH?=?9. The hydrogel containing poly-ampholytic network intelligently responds in the swelling behaviour at different pH. The so prepared hydrogel was used as an adsorbent for the removal of cationic [methylene blue (MB), methyl violet (MV)] and anionic [Tartrazine (TA), Carmoisine-A (CR-A)] dyes from their aqueous solutions. The adsorption showed pH dependence. The cationic dyes were adsorbed at pH?=?7 and anionic dyes were adsorbed at pH?=?2 for TA and pH?=?3 for CR-A. The adsorption followed pseudo second order kinetics and Langmuir isotherm model. The amount of interaction between the hydrogel (adsorbent) and dye molecules (adsorbate) was studied using Gile’s model. The maximum adsorption capacity was found to be 331.5, 286.01, 273.5 and 201.53?mg/g for the MB, MV, CR-A and TA respectively. The cationic dyes were adsorbed strongly than anionic dyes by hydrogel. Various thermodynamics parameters such as Gibbs free energy change (ΔG°), enthalpy change (ΔH°), and entropy change (ΔS°) were also investigated. The removal of dyes by the hydrogel followed in the order MB?>?MV?>?CR-A?>?TA.
机译：通过使用KPS作为引发剂AndN，N'-甲基 - BIS将丙烯酸（AA）和N-乙烯基咪唑（NVI）的混合物接枝到Katira Gum（Kg）上的丙烯酸（AA）和N-乙烯基咪唑（NVI）与Katira Gum（kg）上的混合物来制备pH响应水凝胶。 - 丙烯酰胺（MBA）作为水培养基中的交联剂。通过FTIR，XRD和SEM分析表征pH敏感水凝胶。用水的肿胀研究在不同的pH下进行，其中水凝胶在pH？=Δ4.5和pHα=Δ= 9时显示出两个最大值。含有多水解网络的水凝胶在不同pH的肿胀行为中智能地响应。使用所制备的水凝胶作为去除阳离子[亚甲基蓝色（Mb），甲基紫（mV）]和阴离子[塔拉嗪（TA），甲酰基（TA），甲酰胺-A（Cr-A）]染料的吸附剂。吸附显示pH依赖性。将阳离子染料吸附在pHα=α=α.7和阴离子染料以在pH = =Δ2时被吸附在Ta和pHα和pH = 3中。吸附遵循伪二阶动力学和Langmuir等温模型。使用Gile的模型研究了水凝胶（吸附剂）和染料分子（吸附物）之间的相互作用的量。发现最大吸附能力为331.5,286.01,273.5和201.53Ωmg/ g，分别为Mb，mv，cr-a和ta。阳离子染料通过水凝胶的阴离子染料强烈吸附。还研究了各种热力学参数，例如Gibbs自由能量变化（ΔG°），焓变（ΔH°）和熵变（ΔS°）。通过水凝胶去除染料，遵循顺序Mb？> mv？>Δλαλτα.

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