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design for recycling

Rupa Salian, Suhas Wani, Ramamohan Reddy, Mukund Patil
Brewing industry releases large quantities of wastewater after product generation. Brewery wastewater contains organic compounds which are biodegradable in nature. These biodegradable wastes can be recycled and reused and hence considered as suitable products for agriculture. But before using wastewater for agriculture, it is better to evaluate the phytotoxic effects of wastewater on crops. Hence, the main objective of this study is to evaluate the effects of brewery effluent on seed germination and growth parameters of selected crop species like chickpea (Cicer arietinum), maize (Zea mays), and pigeon pea (Cajanus cajan)...
January 17, 2018: Environmental Science and Pollution Research International
Huiping Chen, Nan Chen, Chuanping Feng, Yu Gao
Ag6Si2O7, a visible light-driven photocatalyst, has attracted considerable attention owing to its enormous environmental remediation potential. In this work, a magnetic iron(II,III) oxide/titania/silver silicate (Fe3O4/TiO2/Ag6Si2O7) nanocomposite was synthesized by anchoring TiO2 and Ag6Si2O7 on the surface of Fe3O4 nanoparticles. The morphology, crystal structure, as well as the spectroscopic, magnetic, and photocurrent properties of the as-prepared Fe3O4/TiO2/Ag6Si2O7 nanocomposite were studied. Methylene blue (MB) was used for evaluating the photocatalytic performance under simulated visible light...
January 6, 2018: Journal of Colloid and Interface Science
Shao-Hua Wu, Biao Zhang, Fang-Fang Wang, Zhen-Zhen Mi, Jian-Jun Sun
A sensitive and selective electrochemical Hg2+ sensor was developed based on T-Hg2+-T structure and exonuclease (Exo) III -assisted target recycling amplification at heated gold disk electrode (HAuDE). First, a DNA signal probe P1 was for the first time designed and labeled with ferrocene (Fc) near the attached SH-5'-end, so as to shorten the distance between Fc and the electrode and enhance the initial current of Fc compared with that labeled at the 3'-end far from the electrode. Then the signal amplification was achieved by Exo III-assisted Hg2+ recycling...
January 5, 2018: Biosensors & Bioelectronics
Ahmed Salama, Peter Hesemann
N-guanidinium chitosan acetate, a new chitosan derivative, was prepared via direct guanylation reaction between chitosan and cyanamide in the presence of scandium (III) triflate. Treatment of N-guanidinium chitosan acetate with 3-(trihydroxysilyl)-1-propanesulphonic acid followed by sol-gel reaction allowed accessing N-guanidinium chitosan silica hybrid material. The new ionic microhybrid was characterized using 13C and 29Si solid state NMR, IR spectroscopy, scanning electron microscopy and thermogravimetry...
January 9, 2018: International Journal of Biological Macromolecules
Songsong Tang, Yuan Gu, Huiting Lu, Haifeng Dong, Kai Zhang, Wenhao Dai, Xiangdan Meng, Fan Yang, Xueji Zhang
Herein, a highly-sensitive microRNA (miRNA) detection strategy was developed by combining bio-bar-code assay (BBA) with catalytic hairpin assembly (CHA). In the proposed system, two nanoprobes of magnetic nanoparticles functionalized with DNA probes (MNPs-DNA) and gold nanoparticles with numerous barcode DNA (AuNPs-DNA) were designed. In the presence of target miRNA, the MNP-DNA and AuNP-DNA hybridized with target miRNA to form a "sandwich" structure. After "sandwich" structures were separated from the solution by the magnetic field and dehybridized by high temperature, the barcode DNA sequences were released by dissolving AuNPs...
April 3, 2018: Analytica Chimica Acta
Yan Lv, Lin Yue, Qian Li, Baoyi Shao, Sen Zhao, Haitao Wang, Shijia Wu, Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol-gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB)...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Guanjun Chang, Li Yang, Junxiao Yang, Mark P Stoykovich, Deng Xu, Jiaxi Cui, Dapeng Wang
Supramolecular chemistry has provided versatile and affordable solutions for the design of intelligent soft materials, but it cannot be applied in stiff materials. This paper describes a new concept for the design of high-performance supramolecular thermosets by using the noncovalent cation-π interaction as cross-linking. These supramolecular thermosets are a class of infusible and insoluble stiff polymers having excellent mechanical properties even at temperatures exceeding 300 °C. The cation-π interaction can be locally and reversibly installed and removed by aqueous treatments at high or low pH, respectively...
January 5, 2018: Advanced Materials
Michael Duss, Livia Salvati Manni, Laurent Moser, Stephan Handschin, Raffaele Mezzenga, Henning J Jessen, Ehud M Landau
The unique molecular architecture of lipidic cubic phases (LCPs) and their cubosome dispersions comprise a well-defined, curved bilayer that spans the entire 3-D material space, encompassing a network of two periodic, curved and non-intersecting three-dimensional aqueous channels. The ensuing large lipid/water interfacial area renders these biomaterials an interesting matrix for the lateral immobilization of organocatalysts to catalyze organic reactions in confined water. Herein, we report for the first time the design, synthesis, assembly and characterization of catalytically active LCPs and cubosomes, and demonstrate their applicability as self-assembled, biomimetic and recyclable nanoreactor scaffolds...
January 9, 2018: ACS Applied Materials & Interfaces
Cong Huang, Wen-Zong Liu, Zhi-Ling Li, Shu-Ming Zhang, Fan Chen, Hua-Rong Yu, Sen-Lin Shao, Jun Nan, Ai-Jie Wang
Elemental sulfur (S0) is always produced during bio-denitrification and desulfurization process, but the S0 yield and purification quality are too low. Till now, no feasible approach has been carried out to efficiently recover S0. In this study, we report the S0 generation and recovery by a newly designed, compact, biofilm formed membrane filtration reactor (BfMFR), where S0 was generated within a Thauera sp. strain HDD-formed biofilm on membrane surface, and then timely separated from the biofilm through membrane filtration...
November 24, 2017: Water Research
Huan Liu, Hongjun Chen, Shan Wang, Qing Liu, Sen Li, Xueer Song, Jiaojiao Huang, Xin Wang, Lishan Jia
To improve the microalgae production in batch cultivation, a cultivation mode that continuously pre-harvesting Spirulina platensis from photobioreactor (PBR) with culture medium recycling was proposed. For realizing the continuously pre-harvesting cultivation mode, a Spirulina platensis culture column PBR with overflowing device was designed, which could adjust pre-harvesting rate through the overflowing device. By adjusting the pre-harvesting rate, the biomass concentration could be kept when biomass accumulation and pre-harvesting biomass were equal...
December 18, 2017: Bioresource Technology
Dan Xu, Winston Duo Wu, Hao-Jun Qi, Rui-Xia Yang, Wei-Qiao Deng
Design and synthesis of adsorbents for efficient decontamination of hazardous contaminants Hg2+ from wastewater, based on a facile and economical strategy, is an attractive target. Here, a novel sulfur rich microporous polymer (sulfur content of 31.4 wt %) with high surface area as well as densely populated sulfur atom with fast accessibility was reported to remove mercury (II) from water. The as prepared polymer (SMP) exhibited high binding affinity, high adsorption capacities, rapid adsorption kinetics, and good recyclability for Hg2+...
December 29, 2017: Chemosphere
Ze Meng, Gayani Chandrasena, Rebekah Henry, Ana Deletic, Peter Kolotelo, David McCarthy
Stormwater constructed wetlands are not well characterised for their ability to remove pathogens which can pose public health risks during stormwater harvesting activities. This study investigated the behaviour of faecal indicator organism Escherichia coli (E. coli) and reference pathogen Campylobacter spp. in stormwater constructed wetlands, using a case study system located in Melbourne, Australia. Grab sampling and event-based monitoring revealed influent concentrations of E. coli were typical of other urban stormwater studies, yet Campylobacter concentrations were orders of magnitude above those urban stormwater studies used to develop the Australian Guidelines for Water Recycling, reached levels typical of raw domestic wastewater...
December 21, 2017: Water Research
Yanshan Liang, Jiaqi Liu, Qisheng Zhong, Lingling Shen, Jinting Yao, Taohong Huang, Ting Zhou
An on-line supercritical fluid extraction coupled with supercritical fluid chromatography method was developed for the determination of four major aromatic constituents in vanilla. The parameters of supercritical fluid extraction were systematically investigated using single factor optimization experiments and response surface methodology by a Box-Behnken Design. The modifier ratio, split ratio and the extraction temperature and pressure were the major parameters which have significant effects on the extraction...
December 28, 2017: Journal of Separation Science
Adela P Galvín, Jesús Ayuso, Auxi Barbudo, Manuel Cabrera, Antonio López-Uceda, Julia Rosales
In general terms, plant managers of sites producing construction wastes assess materials according to concise, legally recommended leaching tests that do not consider the compaction stage of the materials when they are applied on-site. Thus, the tests do not account for the real on-site physical conditions of the recycled aggregates used in civil works (e.g., roads or embankments). This leads to errors in estimating the pollutant potential of these materials. For that reason, in the present research, an experimental procedure is designed as a leaching test for construction materials under compaction...
December 27, 2017: Environmental Science and Pollution Research International
Yong Cui, Chunxia Tan, Jingjing Jiao, Zijian Li, Yan Liu, Xing Han
Supramolecular containers featuring both high catalytic activity and high enantioselectivity represent a design challenge of practical importance. Here we demonstrate that a chiral octahedral coordination cage can be constructed by using twelve enantiopure Mn(salen)-derived dicarboxylic acids as linear linkers and six Zn4-p-tert-butylsulfonylcalix[4]arene clusters as tetravalent four-connected vertices. The porous cage features a large hydrophobic cavity (~3944 Ǻ3) decorated with catalytically active metallosalen species and is shown to be an efficient and recyclable asymmetric catalyst for the oxidative kinetic resolution of racemic secondary alcohols and the epoxidation of olefins with up to >99% ee...
December 26, 2017: Angewandte Chemie
Sonia Gómez-Lavín, María Fresnedo San Román, Inmaculada Ortiz, Jesús Fernández, Pedro de Miguel, Ane Urtiaga
Lindane (γ-hexachlorocyclohexane) manufacture in Spain generated nearly 200,000tonnes of HCH wastes; near 160,000tonnes were originated by the Inquinosa factory located in Sabiñánigo (northern Spain) and were deposited in unlined landfill sites. This study reports for the first time the content of polychlorinated dibenzo-p-dioxin/dibenzofuran (PCDD/Fs) in non-recycled HCH wastes that had been disposed in the Bailín landfill site in Sabiñánigo. Samples from solid HCH powder residues (white HCH and δ-paste wastes) and the dense non-aqueous phase liquids (DNAPLs), as well as landfill leachates, soil and sediments have been characterized...
December 21, 2017: Science of the Total Environment
Xi Zhou, Yujiao Wang, Qi Peng, Weisheng Liu
A multifunctional fluorescent probe BHN-Fe3O4@SiO2 nanostructure for Fe3+ was designed and developed. It has a good selective response to Fe3+ with fluorescence quenching and can be recycled using an external magnetic field. With adding EDTA (2.5 × 10-5 M) to the consequent product Fe3+-BHN-Fe3O4@SiO2, Fe3+ can be removed from the complex, and its fluorescence probing ability recovers, which means that this constituted on-off type fluorescence probe could be reversed and reused. At the same time, the probe has been successfully applied for quantitatively detecting Fe3+ in a linear mode with a low limit of detection 1...
December 19, 2017: Nanoscale Research Letters
Oday H Ahmed, Mohammednoor Altarawneh, Mohammad Al-Harahsheh, Zhong-Tao Jiang, Bogdan Z Dlugogorski
Hydrogen halides (HCl/HBr) represent major halogen fragments from the thermal decomposition of halogen laden materials, most notably PVC and brominated flame retardants (BFRs). Co-pyrolysis of halogen-containing solid waste with metal oxides is currently deployed as a mainstream strategy to treat halogen content as well as to recycle the valuable metallic fraction embedded in electric arc furnace dust (EAFD) and e-waste. However, designing an industrial-scale recycling facility necessitates accurate knowledge on mechanistic and thermo-kinetic parameters dictating the interaction between metal oxides and hydrogen halides...
December 15, 2017: Physical Chemistry Chemical Physics: PCCP
Lanlan Hui, Yi Su, Tingting Ye, Zhao Liu, Qingchang Tian, Chuanjiang He, Yueqi Zhao, Pu Chen, Xiaojia Wang, Weidong Han, Yan Luo, Ben Wang
Cancer cells metastasize and are transported in the bloodstream, easily reaching any site in the body through the blood circulation. A method designed to assess the number of circulating tumor cells (CTCs) should be validated as a clinical tool for predicting the response to therapy and monitoring disease progression in patients with cancer. Although CTCs are detectable in many cases, they remain unavailable for clinic usage due to their high testing cost, tedious operation and poor clinical relevance. Herein, we developed a regeneratable microchip for isolating CTCs that is available for robust cell heterogeneity assays on-site without the need for a sterile environment...
December 13, 2017: ACS Applied Materials & Interfaces
Yaguang Zhang, Dan Jia, Wanqi Sun, Xue Yang, Chuanbo Zhang, Fanglong Zhao, Wenyu Lu
Sophorolipids (SLs) are biosurfactants with widespread applications. The yield and purity of SLs are two important factors to be considered during their commercial large-scale production. Notably, SL accumulation causes an increase in viscosity, decrease in dissolved oxygen and product inhibition in the fermentation medium. This inhibits the further production and purification of SLs. This describes the development of a novel integrated system for SL production using Candida albicans O-13-1. Semicontinuous fermentation was performed using a novel bioreactor with dual ventilation pipes and dual sieve-plates (DVDSB)...
December 13, 2017: Microbial Biotechnology
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