Composition Of Beads Research Articles

Efficient removal of nitrogen and phosphorus in aqueous solutions using modified water treatment residuals-sodium alginate beads.

A high-performance sorbent, modified water treatment residuals-sodium alginate beads (WTR-SA beads), was prepared through a series of salt and combined thermal roasting composite modification between water treatment residuals and sodium alginate. The properties of modified WTR-SA beads composites were characterized by SEM-EDS, FT-IR, XRD, and BET. The adsorption performance of WTR-SA beads was investigated in removing nitrogen and phosphorus from wastewater. Compared to the unmodified WTR, the removal efficiency of nitrogen and phosphorus onto the modified WTR-SA beads was increased from 22.34 and 77.13% to 95.14 and 98.31%, respectively. The adsorption capacities of nitrogen and phosphorus onto the modified WTR-SA beads were reach a maximum of 2.52 mg/g and 6.45 mg/g, respectively. The adsorption behavior can be well described using a quasi-second-order kinetic model and Langmuir isotherm model. The thermodynamic properties of nitrogen adsorption indicated that the adsorption was spontaneous and exothermic. On the contrary, the adsorption process of phosphorus is an endothermic reaction. The adsorption of nitrogen by modified WTR-SA beads is mainly carried out through ion exchange and hydroxyl complexation, and ion exchange plays a major role in it. While, the adsorption of modified WTR-SA beads on phosphorus is affected by three actions: ligand exchange, chemical precipitation, and ion exchange, which ligand exchange is the main effect. Based on these results, it can be concluded that the modified WTR-SA beads are a high efficiency adsorbent for removing nitrogen and phosphorus from domestic and industrial wastewater.

X-ray spectroscopy study of ancient glass beads at Hor-Ek, Thailand

In ancient time, it is well known that glasses have been used in ornament and decorative objects in Thailand for several hundred years as implied by archaeological evidences such as glass beads and decorative glasses. In this work, the blue and red colored glass beads selected from the Hor-Ek archaeological site in Nakhon Pathom province (central Thailand) have been characterized chemical composition using a scanning electron microscope coupled with energy dispersive X-ray spectroscopy (SEM-EDS) and a particle induced X-ray emission spectroscopy (PIXE). Cu-K-edge XANES (X-ray absorption near edge structure) of the selected samples is also carried out in fluorescent mode in order to determine the oxidation state. The results showed that the beads are all the LMHK-based glass (low magnesia, high potash). The red and blue tonalities are affected by copper with different oxidation states, and/or the summation of copper and cobalt. The shape and composition of these ancient glass beads are similar to those collected from other four sites in southern Thailand such as Khlong Thom, Phu Khao Thong, Nang Yon, and Thung Thuk and the foreign countries such as India, China, and Vietnam. These detailsindicate the long-distance trade and exchange network in ancient maritime.

Compositional Analysis of Glass Beads from Huron-Wendat Contexts at the Notre-Dame-de-Lorette Mission Site, Quebec

Glass trade beads recovered during the 2018 excavations of the Notre-Dame-de-Lorette Mission Site (CeEu-11), the site of a c. 1673–1697 Huron-Wendat village at L’Ancienne-Lorette (Quebec), were analyzed using Laser Ablation - Inductively Coupled Plasma - Mass Spectrometry (LA-ICP-MS). This minimally invasive analysis, conducted with permission from the Huron-Wendat Nation of Quebec, provides information about glass bead recipes that can be compared to other known samples from across eastern North America. This paper presents compositional analysis results for 78 artifacts (mainly simple, drawn varieties of blue and white beads) and compares the L’Ancienne-Lorette glass bead compositions to those from other seventeenth-century Wendat archaeological sites in the Western Great Lakes and in Southern Ontario. These sites were occupied both prior to and after the ca. 1650 dispersal of Huron-Wendat people from Wendake. From this research, historic Wendat trade networks and population movements can be inferred.

From sand to sea: tracing the production and trade in glass beads from the 10th-century Cirebon shipwreck in the Java Sea

Around the year 970 CE, a merchant ship carrying an assortment of goods from East Africa, Persia, India, Sri Lanka, Southeast Asia, and China foundered and sank to the bottom of the Java Sea. Thousands of beads made from many different materials—ceramic, jet, coral, banded stone, lapis lazuli, rock crystal, sapphire, ruby, garnet, pearl, gold, and glass—attest to the long-distance movement and trade of these small and often precious objects throughout the Indian Ocean world. The beads made of glass are of particular interest, as closely-dated examples are very rare and there is some debate as to where glass beads were being made and traded during this period of time. This paper examines 18 glass beads from the Cirebon shipwreck that are now in the collection of Qatar Museums, using a comparative typological and chemical perspective within the context of the 10th-century glass production. Although it remains uncertain where some of the beads were made, the composition of the glass beads points to two major production origins for the glass itself: West Asia and South Asia.

Glass beads from Guishan in Iron Age Taiwan: Inter-regional bead exchange between Taiwan, Southeast Asia and beyond

Archaeological excavations at Guishan in the southern end of Taiwan have recovered more than a hundred glass beads dating to mid-1st millennium CE. This research investigates the exchange of glass beads between Guishan, eastern Taiwan and Southeast Asia, by analysing the styles, chemical composition and microstructure of 64 glass beads from Guishan, using SEM-EDS, EPMA and LA-ICP-MS. The findings suggest that beads with an m-Na-Al glass and v-Na-Ca composition are the most common, supporting evidence for bead exchange between Guishan and Southeast Asia, originated in South Asia and Western Asia. Furthermore, most m-Na-Al glasses were coloured by copper, and different types of copper-based additives may have been used for different colours, indicating the beads may be derived from multiple production centres or workshops via Southeast Asia. Conversely, the glass bead compositions suggest that glass bead exchange between other contemporary sites in Taiwan is less evident at Guishan, except for one type of yellow glass bead containing bone ash which is different. This bone-ash containing yellow glass at Guishan is firstly identified in Iron Age Taiwan as well as around the South China Sea region. Its counterparts are also found from archaeological sites in southeastern and coastal eastern Taiwan, which might indicate small scale glass bead exchange. This evidence together suggests a dynamic glass bead exchange network between Guishan, eastern Taiwan, Southeast Asia and beyond.

Middle Bronze Age Long Distance Exchange through Europe and Beyond

Abstract The introduction of the folding stool and the single-edged razor into Southern Scandinavia, as well as the testimony of chariot use during the Nordic Bronze Age Period II (1500-1300 BC), give evidence of the transfer of ideas from the Mediterranean to the North. Recent analyses of the chemical composition of blue glass beads from well-dated Danish Bronze Age burials have revealed evidence for the opening of long distance exchange routes around 1400 BC between Egypt, Mesopotamia and South Scandinavia. When including comparative material from glass workshops in Egypt and finds of glass from Mesopotamia, it becomes clear that glass from those distant lands reached Scandinavia. The routes of exchange can be traced through Europe based on finds of amber from the North and glass from the South.

The chemical composition and manufacturing technology of glass beads excavated from the Hetian Bizili site, Xinjiang

The Hetian Bizili site in Lop County, located on the southern route of the Silk Road in Xinjiang, China, was a trade and cultural hub between the East and the West in ancient times. In 2016, a large number of glass beads were unearthed from the 40 tombs excavated on this site. In this study we determined the chemical compositions and manufacturing technology of bodies and decorations of twelve glass beads from the M5 tomb of Bizili by using LA-ICP-AES, EDXRF, Raman Spectrometry, and SR-μCT. The chemical compositions of the beads were all Na2O–CaO–SiO2, with plant ash mainly used as a flux. Lead antimonate and lead stannate were used as the opacifying agents. We detected elevated levels of boron and high levels of phosphorus in some beads: this is discussed in the context of the type of flux used and the possible use of a P-rich opacifier. Some of the beads with high contents of aluminum may potentially come from Pakistan. In terms of manufacturing technology, the craftsmen made ‘eye’ beads in different ways and also trail decorated beads.

Environment responsive Al3+ networked chitosan-gelatin spherical beads for the effective removal of organic pollutants from aqueous solutions

In order to remove noxious Congo Red (CR), Acid Red 1 (AR1) and Reactive Red 2 (RR2) dye molecules from water, an environment responsive and biodegradable spherical chitosan-gelatin biopolymeric beads were designed and embedded with Al3+ ions. The surface morphology, specific surface area, crystalline phases, elemental composition and thermal properties of the CAG spherical beads had examined. Adsorption experiments were explored to investigate the adsorption properties of dye molecules on CAG spherical beads. The adsorption parameters like solution pH, contact time, co-existing ions, adsorbent dosage and regeneration studies were optimized using batch experiment method. The maximum adsorption efficiency of CR, AR1, and RR2 dye molecules on CAG spherical beads were 34.89, 32.36 and 33.63 mg/g, respectively. The adsorption system fits well with pseudo-second-order kinetics and Freundlich isotherm model. The molecular interactions followed in the adsorption mechanisms were the electrostatic force of attraction, surface complexation and hydrogen bondings that exist between dye molecules and the CAG spherical beads. The CAG spherical beads could be regenerated up to six consecutive cycles using an aqueous 0.1 M NaOH solution. The study emphasizes that the fabricated CAG spherical beads could act as a potential adsorbent in the water/wastewater treatment process.

Removal of Organic Dyes by Using Cellulose-Chitosan-Nanowires Hybrid Composition Beads

Organic dyes are mostly used in textile, paper, plastic, and other industries. These industries can be toxic and harmful to environment and human. Adsorption is the most efficient method to control wastewater that contains dyes. Cellulose-Chitosan beads was mainly used in the adsorption. To increase and enhance the organic dyes removal capacity of these beads, titanium dioxide nanowires (TiO2Nw) as used to achieve novel Cs-Cell-nanowires hybrid composites. Ultralong hydroxyapatite nanowires was prepared and used to enhance the mechanical and thermal properties of beads. On the other hand, the beads composition was prepared with spherical white shape. Internal structure of beads and other composition were studied by using Attenuated Total Reflectance (ATR) spectroscopy, scanning electron microscopy (SEM), lazer diffraction (LD), thermal analysis (TG, DSC, DTG, and DTA). The beads are tested with five different organic dyes which include Methyl blue (MB), Acid alizarin Black (AAB) as cationic dyes, and Methyl orang (MO), Methyl red (MR) and Eriochrome black T (EBT) as anionic dyes. The results indicate that the beads have the ability to remove MB, EBT,AAB but do not have the ability to remove MO and MR. So, the Cell-CS- HAPNw- TiO2Nw beads can be considered as the promising adsorption for MB, EBT, and AAB from aqueous solutions.

A Basic Study for Manufacturing High Refractive Beads from the Waste Fluorescent Glass

This study was carried out to get the optimum conditions for manufacturing high refractive glass beads from waste fluorescent lamp glass. Chemical composition, X-ray diffraction pattern, particle size distribution, refractive index of glass beads, and the effect of air mixing ratio and ejection rate were investigated. The obtained results are as follows. The X-ray diffraction pattern and chemical composition of glass beads made of waste fluorescent glass are similar to common glass except ReO2 0.0108 wt%, BaO 0.071 wt%, NiO 0.0039 wt% and CaO 7.8 wt% but 11.7 wt% of common glass. The glass beads made of waste fluorescent lamp glass have the narrower particle size distribution of and the higher refractive index than the glass beads made of common glass. The optimal conditions of kiln operation for manufacturing glass beads from waste fluorescent lamp glass are 20 m/sec of ejection rate, 1.7 of air mixing ratio, and 940°C of temperature.

Effect of Bead Composition, PVS Type, and Recovery Medium in Cryopreservation of Bleeding Heart ‘Valentine’—Preliminary Study

Bleeding heart (Lamprocapnos spectabilis (L.) Fukuhara) is a valuable ornamental and medicinal perennial. To date, there are few studies focused on cryopreservation of this species, although it could be useful in storage and breeding. This research is aimed at analyzing the effect of bead composition, type of plant vitrification solution (PVS), and the recovery medium of cryopreservation of bleeding heart. Shoot tips of L. spectabilis ‘Valentine’ were used in the study. The explants were precultured on modified Murashige and Skoog medium (MS; 1962), supplemented with 9% sucrose, 1.0-mg·L−1 kinetin (KIN), and 2.62-mg·L−1 abscisic acid. Next, in the first experiment, the shoot tips were embedded in 3% calcium alginate, based either on an MS medium or distilled sterile water. The produced synseeds were inoculated on the recovery medium with 3.0-mg·L−1 KIN, 0.5-mg·L−1 6-benzyladenine (BA), or cytokinin–free control. Based on the results of the first study, in the second experiment, precultured shoot tips were embedded in 3% calcium alginate based on MS medium and dehydrated with PVS2 or PVS3 for various durations. The pre-treated explants were plunged in liquid nitrogen and, after rewarming, inoculated on the recovery MS medium with 0.5-mg·L−1 BA. PVS3 was more effective in securing the shoot tips than PVS2. The highest recovery level (68.3%) was reported after a 150-min pretreatment with PVS3. Explants from this experimental combination also proliferated the highest number of shoots, as well as those with the greatest length. On the other hand, a higher share of dry weight was found in PVS2-derived shoots (13.5–18.2%) compared with plants produced after PVS3 treatment (10.6–11.4%). The obtained results here can serve as a good basis for further studies related to synthetic seeds and cryopreservation of bleeding heart.

Influence of interparticle structuring on the surface energetics of a binary powder system.

The structuring of component particles in binary compositions affects the solid-solid interfacial properties. This work reports the effect of interparticle interactions in binary powder compositions of D-Mannitol and glass beads through the heterogeneity data obtained from Finite Dilution Inverse Gas Chromatography (FD-IGC). Three different scenarios viz. structured, random and segregated systems of the binary powder composition were considered for the analysis in the IGC column. Binary mixtures with large size disparity between the components produced structured mixtures exhibiting a guest-host type of interactions and energetic homogeneity irrespective of the energetics of the finer component. Random and segregated systems revealed a heterogeneous trend in the data indicating preferential probing of the active sites of the composition, particularly at the lower probe coverages. The results demonstrate that in the multicomponent binary systems the surface energetics is influenced by the solid-solid interfaces and structuring of the component particles within the mix i.e., the surface energy analysis could reveal a mixing behavior in powders. Furthermore, an adsorption energy distribution model based on Boltzmann statistics and simulation fitting approach was employed to deconvolute the distribution of the changing energy landscape of the binary mixtures.

Development and Mechanical Characterization of HGMS-EHS-Reinforced Hollow Glass Bead Composites.

Hollow glass microsphere-reinforced epoxy hollow spheres (HGMS–EHSs) were prepared by a “rolling ball method” using expanded polystyrene beads, HGMSs, and epoxy resin (EP). The three-phase epoxy syntactic foam (epoxy/HGMS–EHS–HGMS composite) was fabricated by combining HGMS–EHS as a lightweight filler with EP and HGMS by a “molding method”. The HGMS–EHS and epoxy curing agent systems were well mixed by scanning electron microscopy. Experiments show that higher HGMS–EHS stack volume fraction, lower HGMS–EHS layer number, higher HGMS–EHS diameter, lower HGMS–EHS density, higher HGMS volume fraction, and lower HGMS density result in a decrease in the density of the three-phase epoxy syntactic foam. However, the above factors have the opposite effect on the compressive strength of the three-phase epoxy syntactic foam. Therefore, in order to obtain the “high-strength and low-density” three-phase epoxy syntactic foam, the influence of various factors should be considered comprehensively to achieve the best balance of compressive strength and density of the three-phase epoxy syntactic foam. This can provide some advice for the preparation of buoyancy materials for deep sea operations.

Enhanced removal of Methyl Orange from aqueous solution by Chitosan-CaCl2 beads

Use of low-cost and environmental friendly sorbents has been studied as an ideal alternative to the current costly methods of removing textile dyes especially methyl orange from wastewater. In present study, the adsorption affinity of chitosan (CS)-CaCl2 beads towards anionic acid dye, methyl orange was investigated by performing batch adsorption experiments. The surface morphology and elemental composition of CS-CaCl2 beads were examined using Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-ray Spectroscopy (EDX) respectively. The effects of initial dye concentration (20 to 100 mg/L), adsorbent dosage (0.05 g to 0.5 g), contact time (0 to 48 h), and agitation speed (0 to 300 rpm) were also studied to evaluate the efficacy of adsorption. Adsorption isotherm data of CS-CaCl2 fitted well to Langmuir (R2 = 0.9964) isotherm model, indicating that homogenous adsorbent surface. Kinetic studies showed that the sorption process followed pseudo-second-order rate that involves chemisorption process, indicating that the adsorption nature of dye on CS-CaCl2 adsorbent. Based on the results, CS-CaCl2 beads could be alternative cost effective adsorbents gaining prominence as a method for the removal of anionic acid dye from textile effluent. In conclusion, this study demonstrated a profound impact on improvement in water quality.

SYNTHESIS AND CHARACTERIZATION OF ALGINATE-CARBOXYMETHIL CELLULOSE BEADS FROM CORN STALK (Zea mays) WITH CROSSLINK VARIATION C4H6O4Zn

<em>Corn stalk has a high cellulose content, so that it is potential to be used as a composition for making alginate-carboxymethyl cellulose beads. Alginate and cellulose are biodegradable, renewable and non-meltable polymers that have wide applications in various industrial sectors. The purpose of this study was to determine the effect of crosslinking agent C<sub>4</sub>H<sub>6</sub>O<sub>4</sub>Zn on the adsorption and shape of beads. The varied concentrations of C<sub>4</sub>H<sub>6</sub>O<sub>4</sub>Zn are 3%; 5% and 10%. Characterization of alginate-carboxymethyl cellulose beads composites using Fourier Transform InfraRed (FTIR), and Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX).</em> <em>Based on research, the highest swelling value is obtained at 5% C<sub>4</sub>H<sub>6</sub>O<sub>4</sub>Zn crosslink which is 59.68%. FTIR data shows the appearance of wave numbers at 1413 cm<sup>-1</sup> which indicates the presence of C-O Na groups, while at wave number 458 cm<sup>-1</sup> indicates the presence of Zn-O groups. SEM-EDX data with a 5% C<sub>4</sub>H<sub>6</sub>O<sub>4</sub>Zn crosslink has a round shape with a wrinkled surface, multiple grooves causing a non-homogeneous surface. Whereas in C<sub>4</sub>H<sub>6</sub>O<sub>4</sub>Zn 10% the surface is almost smooth</em>

A novel impedimetric sensor for detecting LAMP amplicons of pathogenic DNA based on magnetic separation

A novel impedimetric sensor was developed for the detection of loop mediated isothermal amplification (LAMP) amplicons of various foodborne pathogens through combining with a microfluidic system and magnetic separation procedure. The amplified nucleic acid products (amplicons) of the LAMP reaction can adsorb on magnetic beads surface via electrostatic adsorption process. The obtained nucleic acid-magnetic bead composites were re-dispersed in deionized water and the impedance response was measured by injecting the nucleic acid-magnetic bead composites into the microfluidic system. On account of the quite low conductivity (1˜2 μS cm―1) of deionized water, the weak change of charge can be detected by impedance. Thus the abundant negative charges of nucleic acids in the composites can produce an obviously reduction of impedance signal. Based on the principle, the developed impedimetric sensing method was used for sensing various foodborne pathogens including Escherichia coli O157:H7 (E. coli O157:H7), Vibrio parahaemolyticus (V. parahaemolyticus), Staphylococcus aureus (S. aureus), and Listeria monocytogenes (L. monocytogenes), which achieved a low detection limit (10 copies). Compared with the conventional gel electrophoresis method, our method is more sensitive and faster, which has a potential for fast and sensitive detection of the LAMP products of various targets.

Low percolation 3D Cu and Ag shell network composites for EMI shielding and thermal conduction

Metal-coated polymer bead based composites are promising as electromagnetic interference (EMI) shielding and thermally conductive materials because they form a percolation 3D metal shell network at very low filler content. Herein, we fabricated 3D Cu/Ag shell network composites through electroless plating of metal on polymer beads and a simple hot pressing technique. Cu and Ag shells provide a continuous network for electron and heat conduction; thus, yielding excellent EMI shielding effectiveness of 110 dB at a 0.5 mm thickness and a thermal conductivity of 16.1 W m−1K−1 at only 13 vol % of metal filler. The properties of composites depend on the size of polystyrene (PS) beads and large size metal-coated PS bead composites exhibit higher electrical conductivity, EMI shielding effectiveness, and thermal conductivity than small size bead composites. These results are ascribed to the reduction in the number of contact interfaces between metal-coated beads, which minimizes the interfacial resistance. This study is set to pave the way for designing advanced EMI shielding and thermal conductive materials by a scalable and efficient synthesis approach.

Glass Beads, Markers of Ancient Trade in Sub-Saharan Africa: Methodology, State of the Art and Perspectives

Glass beads have been produced and traded for millennia all over the world for use as everyday items of adornment, ceremonial costumes or objects of barter. The preservation of glass beads is good and large hoards have been found in archaeological sites across the world. The variety of shape, size and colour as well as the composition and production technologies of glass beads led to the motivation to use them as markers of exchange pathways covering the Indian Ocean, Africa, Asia, Middle East, the Mediterranean world, Europe and America and also as chronological milestones. This review addresses the history of glass production, the methodology of identification (morphology, colour, elemental composition, glass nanostructure, colouring and opacifying agents and secondary phases) by means of laboratory based instruments (LA-ICP-MS, SEM-EDS, XRF, NAA, Raman microspectroscopy) as well as the mobile instruments (pXRF, Raman) used to study glass beads excavated from sub-Saharan African sites. Attention is paid to the problems neglected such as the heterogeneity of glass (recycled and locally reprocessed glass). The review addresses the potential information that could be extracted using advanced portable methods of analysis.

Elemental Composition of Glass Beads Excavated from Saleh Davoud Tombs in Susa by micro-PIXE: Evidences of Trade of Glass Artifacts During the Parthian Period

Elemental Composition of Glass Beads Excavated from Saleh Davoud Tombs in Susa by micro-PIXE: Evidences of Trade of Glass Artifacts During the Parthian Period

Cellulose acetate beads modified with cadmium sulfide and Methylene blue for adsorbent-assisted photoelectrochemical detection of copper(II) ions.

A multi-functional hybrid of cellulose acetate with cadmium sulfide and Methylene blue (CA/CdS/MB) in a bead composition was synthesized and investigated as a photosensor-adsorbent for the rapid, selective, and sensitive detection, and adsorption of Cu(II) ions. These hybrid CA-modified beads are composed of multiple adsorption active sites and possess a surface area of 58 cm2g-1. They are an efficient adsorbent with a maximum adsorption capacity of 0.57mgg-1. Photoelectrochemical (PEC) detection of Cu(II) was accomplished by modifying the beads on a glassy carbon electrode. The beads containing 20mmol of sulfur displayed the widest linear analyticalrange (0.1-290nM) and the lowest detection limit (16.9nM) for Cu(II) with high selectivity and reliable reproducibility. The successful application of the beads has provided a new insight for the selection of a responsive photoactive material for a PEC assay, as well as an effective adsorbent material for Cu(II) ions. Graphical abstract A multi-functional hybrid of cellulose acetate with cadmium sulfide and Methylene blue (CA/CdS/MB) in a bead composition was synthesized and investigated as a photosensor-adsorbent for the rapid, selective and sensitive detection and adsorption of Cu(II) ions.