Rapid removal of Cr(VI) ions from aqueous solutions by the macroporous poly(<i>N, N</i>′‐dimethylamino ethyl methacrylate) hydrogels

Zhu, Weixia; Song, Hang; Du, Kaifeng; Zeng, Hao; Yao, Shun

doi:10.1002/app.38409

Cited by 14 publications

(7 citation statements)

References 24 publications

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“…Comparing with MD, the surfaces of PD and ED are dense and smooth. The rough and porous surface of MD is consistent with the findings of our previous research 16 . The SEM images of the polymer hydrogels after adsorption of dyes are shown in Figure 3(d-f).…”

Section: Characterizationsupporting

confidence: 92%

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Efficient Removal of Two Typical Anionic Dyes from Aqueous Solution by the Novel Polymer Hydrogels

2016

Chem Sci Trans

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Poly(N,N dimethylaminoethyl methacrylate) hydrogels (PDMAEMA) were optimized by pore-forming and copolymerization with polyethyleneimine (PEI) and the macroporous PDMAEMA together with the composite materials PEI/PDMAEMA were synthesized to remove anionic dyes from aqueous solution for the first time. The physicochemical properties of these materials were investigated by Fourier transform infrared spectroscopy (FT-IR), elemental analysis (E.A), thermogravimetric analysis (TGA) and scanning electron microscope (SEM). The adsorption behaviors of PDMAEMA, macroporous PDMAEMA and PEI/PDMAEMA for sunset yellow FCF and amaranth were compared. The results showed that the adsorption rate of macroporous PDMAEMA was faster than that of PDMAEMA, and the adsorption capacity was nearly unchanged; but for PEI/PDMAEMA, both adsorption rate and adsorption capacity were improved. The maximum adsorption capacity of PEI/PDMAEMA could reach 744.14 mg/g for SY FCF and 757.10 mg/g for amaranth, and the saturation adsorption time were both 1 h. The adsorption isotherms and kinetics were well fitted by Langmuir model and pseudo second-order model, respectively, and the adsorption mechanism was explained by electrical double layer theory. In addition, the desorption ratio of above 92% indicated that these adsorbing materials could be regenerated successfully for recycle and reuse. In a word, ED hydrogels have the excellent adsorption capability and could be employed as a new potential useful adsorbent for the decontamination and analysis of wastewater containing anionic dyes in large scale. RESEARCH ARTICLE 939Chem Sci Trans., 2016, 5(4), 938-954 solvent extraction, membrane filtration, adsorption etc., have been used to treat dye wastewater 1,4 . Among all these methods, adsorption is recognized as a very appealing way because of its easy availability, simplicity of design, amity to environment, high selectivity and efficiency, easy operation and recycling, etc. 4,5 . In recent years, many novel adsorbents have been developed, such as polystyrene 6 , lanatus rind 7 , chitosan 8 , mangrove barks 9 , polymer 10 , hydroxides 11 . Poly(N, N-dimethylaminoethyl methacrylate) (PDMAEMA) hydrogel, a cationic polymer, has received considerable attention because of the excellent adsorption ability. Tokuyama et al.,12 investigated that the adsorption capabilities of poly(2-(dimethylaminoethyl)methacrylate) gels for Pt(IV) and Au(III) were 0.2542 mmol/g and 0.2351 mmol/g, respectively, and the adsorption amount could be adjusted by temperature-swing. Dilek Solpan et al. 13 successfully synthesized the ternary mixtures of DMAEMA/ ethyleneglycol dimethacrylate (EGDMA)/water (H 2 O). The maximum adsorption values of Apollofix Red (AR) and Apollofix Yellow (AY) on the ternary mixtures are 131 mg/g and 111 mg/g, respectively. Although the adsorption capacity of PDMAEMA is better than the traditional adsorbents, there are still some shortcomings. On the one hand, the adsorption process is time-consuming. It took seven days to reach the adsorption balance ...

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Section: Characterizationsupporting

confidence: 92%

“…PDMAEMA and macroporous PDMAEMA hydrogels were prepared according to our previous report 16 and the macroporous gels were obtained in 5 wt% Na 2 SO 4 solution in this study. Composite material PEI/PDMAEMA was synthesized by amino radical polymerization.…”

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

Efficient Removal of Two Typical Anionic Dyes from Aqueous Solution by the Novel Polymer Hydrogels

2016

Chem Sci Trans

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“…Millions of people die on account of the diseases caused by drinking water contaminated with heavy metals [3,5]. Chromium (Cr) is highly toxic metal on account of its carcinogenic nature [6,7].…”

Section: Introductionmentioning

confidence: 99%

Anion Exchange Sorption of Chromate from Aqueous Solutions by Activated Carbon

Sultana

2018

Pak. J. Anal. Environ. Chem.

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Water decontamination from chromium (Cr) is of prime importance because of its carcinogenic nature. The sample of activated carbon was characterized by surface area analyzer, SEM/EDX, TGA, FTIR and PZC. This study was focused on adsorption of hexavalent chromium from the aqueous phase onto activated carbon. Both the temperature and pH had a positive effect on the chromate uptake by activated carbon. The chromate uptake at different pH values followed the trend: pH 2 > pH 3 > pH 4 > pH 5 > pH 7 > pH 8. The sorption maxima at pH 2 was explained on the basis of electrostatic attraction between the negatively charged chromate anions and positively charged surface of the activated carbon. Different models were tested to access the sorption maxima and to probe into the chromate adsorption mechanism. The thermodynamic parameters suggested that heat is needed to shift the hexavalent chromium from solution to the solid surface. It was concluded that the anion exchange sorption was involved in removing the chromate anion from the aqueous system into the surface of activated carbon.

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“…Giving further credence to the BIEE-crosslinking approach as an alternative to synthetically demanding and multistep controlled polymerization processes, in the present study we report on the synthesis of 3D structure-defined emissive (fluorescent) amphiphilic semi-IPN, consisting of BIEE-crosslinked pDMAEMA segments and embedded hydrophobic and nonconjugated/fluorescent poly(9-anthrylmethyl methacrylate) (pAnMMA) linear chains both prepared by reversible addition–fragmentation chain transfer (RAFT)-controlled radical polymerization. Although in this case the coordinating active part (pDMAEMA) [ 58 , 59 , 60 , 61 , 62 , 63 ] is not covalently bound to the fluorescent active component (pAnMMA), the semi-IPN network architecture promotes the reinforcement of interactions between the pDMAEMA-complexed transition metal ions and the anthracene moieties of the interlaced pAnMMA chains, thus promoting chelation-enhanced fluorescence quenching. Moreover, interlacing of the pAnMMA chains within the nonfluorescent pDMAEMA network diminishes phase separation phenomena (and, consequently, self-quenching effects).…”

Section: Introductionmentioning

confidence: 99%

Semi-Interpenetrating Polymer Networks with Predefined Architecture for Metal Ion Fluorescence Monitoring

et al. 2016

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Abstract:The development of new synthetic approaches for the preparation of efficient 3D luminescent chemosensors for transition metal ions receives considerable attention nowadays, owing to the key role of the latter as elements in biological systems and their harmful environmental effects when present in aquatic media. In this work, we describe an easy and versatile synthetic methodology that leads to the generation of nonconjugated 3D luminescent semi-interpenetrating amphiphilic networks (semi-IPN) with structure-defined characteristics. More precisely, the synthesis involves the encapsulation of well-defined poly(9-anthrylmethyl methacrylate) (pAnMMA) (hydrophobic, luminescent) linear polymer chains within a covalent poly(2-(dimethylamino)ethyl methacrylate) (pDMAEMA) hydrophilic polymer network, derived via the 1,2-bis-(2-iodoethoxy)ethane (BIEE)-induced crosslinking process of well-defined pDMAEMA linear chains. Characterization of their fluorescence properties demonstrated that these materials act as strong blue emitters when exposed to UV irradiation. This, combined with the presence of the metal-binding tertiary amino functionalities of the pDMAEMA segments, allowed for their applicability as sorbents and fluorescence chemosensors for transition metal ions (Fe 3+ , Cu 2+ ) in solution via a chelation-enhanced fluorescence-quenching effect promoted within the semi-IPN network architecture. Ethylenediaminetetraacetic acid (EDTA)-induced metal ion desorption and thus material recyclability has been also demonstrated.

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Rapid removal of Cr(VI) ions from aqueous solutions by the macroporous poly(N, N′‐dimethylamino ethyl methacrylate) hydrogels

Cited by 14 publications

References 24 publications

Efficient Removal of Two Typical Anionic Dyes from Aqueous Solution by the Novel Polymer Hydrogels

Efficient Removal of Two Typical Anionic Dyes from Aqueous Solution by the Novel Polymer Hydrogels

Anion Exchange Sorption of Chromate from Aqueous Solutions by Activated Carbon

Semi-Interpenetrating Polymer Networks with Predefined Architecture for Metal Ion Fluorescence Monitoring

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