CLEAN-Soil Air Water
·
2013
·Vol. 41
·期 10
·992-1001
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IF 2.046
Sui Wang,Jing Wei,Shasha Lv,Zhiyong Guo,Feng Jiang
A magnetic-sulfonic graphene nanocomposite (G-SO 3 H/Fe 3 O 4 ) was synthesized and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. It was used for removal of three cationic dyes: safranine T (ST), neutral red (NR), victoria blue (VB), and three anionic dyes: methyl orange, brilliant yellow, and alizarin red, from environmental water. The experimental conditions were optimized, including pH, amount of adsorbent, adsorption kinetics, adsorption isotherms, ionic strength, etc. The results show that G-SO 3 H/Fe 3 O 4 can adsorb cationic dyes more efficiently and selectively than anionic dyes at pH 6.0. In the first 10 min of adsorption time, more than 93% of the cationic dyes were removed by the sorbent. Adsorption kinetics follow the pseudo-second-order kinetic model well. The adsorption isotherm coincided with Langmuir and Freundlich adsorption models. The maximum adsorption capacities of G-SO 3 H/Fe 3 O 4 for ST, NR, and VB dyes were 199.3, 216.8, and 200.6 mg g −1 . The adsorbed cationic dyes were eluted by using different pH values of ethanol as the solvent. The established method was simple, sensitive, and rapid, and was suitable for the adsorption of cationic dyes in environmental water.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2014
·
IF 2.129
Linlin Wang,Yizhong Shen,Shaopu Liu,Jidong Yang,Wanjun Liang,Dan Li,Youqiu He
The interactions of topotecan hydrochloride (THC), neutral red (NR) and thioglycolic acid (TGA) capped CdTe/CdS quantum dots (QDs) built a solid base for the controlling of the fluorescent reversible regulation of the system. This study was developed by means of ultraviolet–visible (UV–vis) absorption, fluorescence (FL), resonance Rayleigh scattering (RRS) spectroscopy and transmission electron microscopy (TEM). Corresponding experimental results revealed that the fluorescence of TGA-CdTe/CdS QDs could be effectively quenched by NR, while the RRS of the QDs enhanced gradually with the each increment of NR concentration. After the addition of THC, the strong covalent conjugation between NR and THC which was in carboxylate state enabled NR to be dissociated from the surface of TGA-CdTe/CdS QDs to form more stable complex with THC, thereby enhancing the fluorescence of the TGA-CdTe/CdS QDs-NR system. What is more, through analyzing the optical properties and experimental data of the reaction between TGA-CdTe/CdS QDs and NR, the possible reaction mechanism of the whole system was discussed. This combination of multiple spectroscopic techniques could contribute to the investigation for the fluorescent reversible regulation of QDs and a method could also be established to research the interactions between camptothecin drugs and dyes.
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BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Yan Zhao,Weijia Cao,Zhen Wang,Bowen Zhang,Kequan Chen,Pingkai Ouyang
In this study, Actinobacillus succinogenes NJ113 microbial electrolysis cells (MECs) were used to enhance the reducing power responsible for succinic acid production from corncob hydrolysate. During corncob hydrolysate fermentation, electric MECs resulted in a 1.31-fold increase in succinic acid production and a 1.33-fold increase in the reducing power compared with those in non-electric MECs. When the hydrolysate was detoxified by combining Ca(OH) 2 , NaOH, and activated carbon, succinic acid production increased from 3.47 to 6.95 g/l. Using a constant potential of −1.8 V further increased succinic acid production to 7.18 g/l. A total of 18.09 g/l of succinic acid and a yield of 0.60 g/g total sugar were obtained after a 60-h fermentation when NaOH was used as a pH regulator. The improved succinic acid yield from corncob hydrolysate fermentation using A. succinogenes NJ113 in electric MECs demonstrates the great potential of using biomass as a feedstock to cost-effectively produce succinate.
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CARBON
·
2017
·
IF 6.337
Jianliang Xiao,Jifei Zhang,Weiyang Lv,Yihu Song,Qiang Zheng
Comprehensive treatment of multifarious contaminations in waterbody demands multifunctional adsorbents with easy reusability , high efficiency, and broad-spectrum adsorption performance. Herein hydrothermally reduced graphene oxide/poly (vinyl alcohol) (TRGO/PVA) aerogels fulfilling these requirements were developed via a facile and green in situ hydrothermal reduction followed by direct sol-aerogel transformation strategy. The interfacial interaction between TRGO sheets and PVA macromolecules as proved by various methods could effectively prevent TRGO from aggregation, which improves mechanical and adsorption performances and assures reusability of aerogels. The aerogels demonstrate an attractive broad-spectrum universality in adsorbing diverse cationic, anionic and nonionic dyes, surpassing most adsorbents that could only remove either positively or negatively charged dyes. The aerogels demonstrate a promising synergetic effect for adsorption two oppositely charged dyes, exhibiting the highest total adsorption amount (>900 mg/g) among known absorbents for removing mixed dyes. Besides, the aerogels after hydrophobic modification are able to effectively adsorb common oils and organic solvents spilling on water. Furthermore, the aerogels are compressible, dimension stable and solvent resistive and can be easily regenerated, bringing a great superiority in the comprehensive treatment of multiple contaminations in waterbody.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Hong Niu,Dan Song,Haibo Mu,Wuxia Zhang,Feifei Sun,Jinyou Duan
Mushroom Inonotus obliquus ( I. obliquus ), a folk medicine, has been widely used to treat several human malicious tumors since 16th century. In this study, three homogenous biomolecules (designated IOA1, IOA2 and IOA3) were prepared from the alkali extract of I. obliquus . Their molecular weights were measured to be 6.1 × 10 4 , 2.9 × 10 4 and 3.5 × 10 4 g/mol respectively and all of them were characterized as lignin–carbohydrate complexes mainly comprised lignin as well as −25% carbohydrates. Antioxidant assays indicated that all of them exhibited pronounced reductive power and strong scavenging activities on DPPH and hydroxyl radicals in vitro . Immunological tests showed that they could also significantly stimulate nitric oxide production and phagocytic activity in RAW 264.7 macrophages. These results implied that the lignin–carbohydrate complexes extracted from I. obliquus might be used as novel natural antioxidants or immunostimulants in functional foods or pharmaceutical candidates.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 3
·45697
·
IF 1.86
Jing Ren,Chunqiu Yan,Qingwen Liu,Qingbiao Yang,Guanxiu Lu,Yan Song,Yaoxian Li
Amidoxime-modified polyacrylonitrile nanofibrous films (AOPAN NFs) were prepared via an electrospinning technique. The traditional preparation methods for amidoximated polyacrylonitrile (AOPAN) solution were changed and improved. First, the PAN solution was modified by hydroxylamine hydrochloride to produce an AOPAN solution, and then, a small amount of inhibitor was added to the AOPAN solution for electrospinning. We found that the crosslinking of the AOPAN solution was inhibited by the addition of a small amount of inhibitor; at the same time, the storage time of the AOPAN solution was prolonged. In addition, the prepared AOPAN solution was electrospun into nanofibrous films, which could be used as excellent adsorption materials for Cu(II), Pb(II), and methyl orange (MO) after drying. The maximal adsorption capacities for Cu(II), Pb(II), and MO were 143.47, 178.57, and 68.07 mg/g, respectively. The adsorption capacities of the nanofibrous films were more than 50% that of the first adsorption after four recycling runs; this indicated the reusability of the nanofibrous films for water treatment. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45697.
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Materials
·
2016
·Vol. 9
·期 4
·230
·
IF 2.728
Lili Ren,Yingchun Cai,Limin Ren,Hong Yang
Beeswax was modified through the direct blending of nano-TiO2, chitosan, acid dyes, and neutral dyes. With the varied modified beeswax, hot waxing was conducted on compressed poplar wood. Treated wood surfaces were characterized with scanning electron microscopy and thermogravimetric analysis. Results show that the C, O, N, Au, S, and Ti elements in modified beeswax successfully penetrated into pits of compressed poplar wood, imparting rich colors to the wood surface. The blending of 10% (mass fraction) beeswax, 0.2% chitosan, and 0.05% neutral red was the best treatment for mulation for improving the in-surface staining uniformity, durability, surface gloss, contact angle, and texture conspicuity of compressed poplar.Keywords:beeswax;chitosan;nano-TiO2;dye;hot waxing;surface properties of compressed wood
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 31
·12126-12135
·
IF 8.262
Jianliang Xiao,Weiyang Lv,Zhou Xie,Yeqiang Tan,Yihu Song,Qiang Zheng
π–π interactions between graphene and organic dyes with a conjugate aromatic structure play a key role in the field of high-efficiency, broad-spectrum adsorbents for the removal of water contaminants. L-Cysteine reduced graphene oxide (RGO-Cys) has a good conjugate structure and dispersity in aqueous solution, endowing it with great adsorption efficiency towards anionic, nonionic and cationic dyes with a conjugate aromatic structure mainly via π–π interactions, as proved by the Raman spectrum and special adsorption experiments. The maximum adsorption capability for anionic indigo carmine (IC) and cationic neutral red (NR) is as high as 1005.7 mg g−1 and 1301.8 mg g−1, respectively, the former being the highest among those reported for adsorbents known to date. The total adsorption amount in mixed dye solutions is even higher (>3500 mg g−1), the highest total capability for simultaneous adsorption of anionic and cationic dyes in their solution mixtures. The π–π stacking adsorption mechanism ensures RGO-Cys to be used as a broad-spectrum adsorbent with high efficiency for many kinds of dye contaminants in water while the remnant carboxyl groups on graphene nanosheets facilitate effective adsorption towards Cu2+ with a capability as high as 139.2 mg g−1, opening up many possibilities for the use of graphene in water cleaning including disinfection, decontamination, and desalination.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Meihong Liu,Qing Chen,Kuan Lu,Wenqiang Huang,Zhenhua Lü,Choumou Zhou,Sanchuan Yu,Congjie Gao
High energy consumption and membrane fouling are the two major obstacles that limit the extensive application of nanofiltration technology in treatment of textile and dyeing wastewaters. In this work, traditional polyamide (PA) thin-film composite (TFC) nanofiltration membrane was modified with diethanolamine (DEA) for improved water permeability and antifouling property in the removal of dyes from aqueous solution. The DEA-modified PA-TFC membrane was fabricated by a facile approach of pouring the DEA-aqueous solution on the surface of the nascent polyamide membrane prepared via interfacial polymerization between trimesoyl chloride and piperazine. The covalent attachment of DEA molecules was found to make membrane surface more hydrophilic and less negatively charged while having no influence on the morphological structure and compactness of the active layer. Compared with the traditional PA-TFC membrane, the steady-state water fluxes of the DEA-modified PA-TFC membrane to dye aqueous solutions of Congo red, methyl blue, sunset yellow and neutral red were higher by more than 37.0%, the flux decline ratios due to membrane fouling were lower by at least 35.0%, while the dye removal remained constant, and furthermore, the dye molecules adsorbed and deposited on membrane surface could be more readily washed off by simple hydraulic washing.
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RSC Advances
·
2017
·Vol. 7
·期 20
·12185-12193
·
IF 3.108
Yuhua Zhang,Keming Jiang,Degang Qing,Bing Huang,Jiayi Jiang,Shumei Wang,Chunyan Yan
Camptotheca acuminata Decne (Nyssaceae) is a major natural source of the anticancer drug camptothecin (CPT) and its derivatives. The leaves and stems are two of the main regions that accumulate CPT in C. acuminata. In this study, we successfully isolated cambial meristematic cells (CMCs) and dedifferentiated cells (DDCs) from C. acuminata stems and leaves, identified their characteristic features using micrograph analysis, and assessed their hypersensitivity to γ-irradiation and zeocin. The growth and kinetics curves of CMCs and DDCs were also studied. Furthermore, the accumulation of CPT and 10-hydroxycamptothecin (HCPT)—a more potent and less toxic CPT derivative—was assessed by liquid chromatography, and the transcriptional levels of nine genes encoding key enzymes involved in CPT and HCPT biosynthesis was assessed using quantitative real-time polymerase chain reaction (PCR) in CMCs and DDCs. The results showed that CMCs induced were particularly hypersensitive to γ-irradiation and zeocin and presented with abundant and small vacuoles, whereas DDCs were not. The above morphological and physiological characteristics of CMCs were consistent with previous reports. B5 medium was determined as the best growth medium for CMCs and DDCs. The accumulation of CPT and HCPT was higher in CMCs than DDCs, and the expression of IPI, G10H, ASA1, TSB, TDC1, TDC2, and STR was significantly upregulated in CMCs compared with DDCs; HMGR2 and HMGR3 were downregulated in CMCs. We speculate that the high accumulation of CPT and HCPT in CMCs was due to the upregulation of these seven genes.
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JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Hongyan Tang,Jun He,Liting Hao,Feng Wang,Huapeng Zhang,Yuhai Guo
A thin film composite (TFC) nanofiltration membrane was fabricated through interfacial polymerization on microporous poly(tetrafluoroethylene) (PTFE) substrates, which were fabricated by bi-stretching process (longitudinal and transverse stretching). Multilayers were formed on PTFE substrate via physical twining and chemical linkage. Impacts of bi-stretching ratios on separation properties of TFC nanofiltration membrane were deeply investigated. Results indicate that the increase of longitudinal stretching ratio increased the length of fibrils and induced larger pore sizes and porosities, which resulted in lower values of rejection and higher permeate flux. However, the increase of transverse stretching ratio induced that the pore sizes declined and the porosities increased, which may be due to interlaced fibrils. Accordingly, it induced higher values of rejection and permeate flux. The obtained TFC nanofiltration membrane exhibited good acid stability (over 30 days) and high stability on long term (over 90 days). It could be potentially employed in nanofiltration process.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 10
·5807-5821
·
IF 2.599
Xiao Jianliang,Lv Weiyang,Xie Zhou,Song Yihu,Zheng Qiang
It is a challenge to develop broad-spectrum, high-efficiency, easy-recyclable adsorbents for the removal of water contaminants. Herein, l -cysteine-reduced graphene oxide/poly(vinyl alcohol) (CRG/PVA) ultralight aerogels with good mechanical strength and reusability are prepared via a direct sol–aerogel transition strategy by freeze drying. At optimized composition, the aerogel shows high adsorption efficiency toward both cationic and anionic dyes, overcoming the defect of many traditional adsorbents that usually can only remove one type of organic dyes. The adsorption is proved to involve in π – π interaction between CRG and dyes, endowing the aerogel with universality in adsorbing a wide range of conjugated dyes. Moreover, a remarkable synergetic effect is observed for removal of two oppositely charged dyes from aqueous system, yielding exceptionally high total adsorption capacities surpassing all known adsorbents examined for removing binary dyes. Thus, the CRG/PVA aerogel demonstrates great potential for usage as reusable, high-efficiency, and broad-spectrum adsorbent in water treatment.
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