Read by QxMD icon Read

Removal Of Metal Ions

Qiantao Shi, Amalia Terracciano, Ying Zhao, Chaoyang Wei, Christos Christodoulatos, Xiaoguang Meng
Activated carbon (AC) is commonly used in faucet and pitcher filters for lead (Pb(II)) removal in homes. This study evaluated the Pb(II) removal performance of AC and metal oxides (e.g. Fe(OH)3 and TiO2 ), as well as the co-existing ions' effect on Pb(II) removal. Results showed that metal oxides had higher adsorption capacity (28.9-51.5 mg/g) than AC (21.2 mg/g). Pb(II) was inner-spherically adsorbed onto both AC and metal oxides surfaces. Among various metal ions, calcium (Ca(II)) demonstrated dramatic effects on Pb(II) removal ability of AC, while it had no effect on Pb(II) adsorption by metal oxides...
August 3, 2018: Science of the Total Environment
Zachary D McClure, Samuel Temple Reeve, Alejandro Strachan
Recrystallization of glasses is important in a wide range of applications including electronics and reactive materials. Molecular dynamics (MD) has been used to provide an atomic picture of this process, but prior work has neglected the thermal transport role of electrons, the dominant thermal carrier in metallic systems. We characterize the role of electronic thermal conductivity on the velocity of recrystallization in Ni using MD coupled to a continuum description of electronic thermal transport via a two-temperature model...
August 14, 2018: Journal of Chemical Physics
V Vijaya Kumar, C Ramesh Kumar, A Suresh, S Jayalakshmi, U Kamachi Mudali, N Sivaraman
Four types of polybenzimidazole (PBI)-based polymers ( m -PBI, p -PBI, pyridine-based m -PBI and alkylated m -PBI) have been prepared and characterized. Extraction behaviour of heavy metal ions, viz. U(VI), Th(IV) and Pd(II), with these polymers was investigated. Distribution ratios for the extraction of these metal ions were measured as a function of nitric acid concentration. Extraction data reveal that, in general, p -PBI exhibits a higher distribution ratio for U(VI), Th(IV) and Pd(II) compared with the other polymeric resins evaluated in the present study...
June 2018: Royal Society Open Science
Thembaninkosi G Gaule, Mark Andrew Smith, Katarzyna M Tych, Pascale Pirrat, Chi H Trinh, Arwen R Pearson, Peter F Knowles, Michael John McPherson
Copper amine oxidases (CuAOs) are metalloenzymes that reduce molecular oxygen to hydrogen peroxide during catalytic turnover of primary amines. In addition to Cu2+ in the active site, two peripheral calcium sites, ca. 32 Å from the active site, have roles in Escherichia coli amine oxidase (ECAO). The buried Ca2+ (Asp533, Leu534, Asp535, Asp678, Ala 679) is essential for full-length protein production, while the surface Ca2+ (Glu573, Tyr667, Asp670, Glu672) modulates biogenesis of the 2,4,5-trihydroxyphenylalanine quinone (TPQ) cofactor...
August 15, 2018: Biochemistry
Ahmed Hamdy, Mohamed K Mostafa, Mahmoud Nasr
Nanoscale zero-valent iron (nZVI) particles were investigated for the removal of methylene blue (MB) from aqueous solutions and the treatment of textile industry effluents. The nZVI material was characterized by XRD, TEM, EDS, FTIR, and SEM. It was demonstrated that several functional groups such as C-H, C = C, C-C, and C-O contributed to MB reduction. At initial MB concentration of 70 mg/L, the optimum pH was 6, achieving a removal efficiency of 72.1% using an nZVI dosage of 10 g/L, stirring rate of 150 rpm, and temperature of 30 °C within 30 min...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Jia-Qi Tang, Jiang-Bo Xi, Jun-Xia Yu, Ru-An Chi, Jia-Dong Chen
A novel combined biosorption-precipitation process has been designed and applied to recycle Pb2+ from low concentration lead containing wastewater. Pb2+ was firstly removed selectively from wastewater by pyromellitic dianhydride (PMDA) modified sugarcane bagasse (SB) fixed-bed column, and then, it was desorbed into the concentrated eluate and recycled by adding chemical precipitant. Adsorption performance of the column and optimum desorption and precipitation condition for Pb2+ were investigated in detail. Results showed that the as-prepared column could efficiently remove Pb2+ from aqueous solution and optimum condition for Pb2+ precipitation in eluate was at pH 3...
August 10, 2018: Environmental Science and Pollution Research International
Manish Sharma, Parth Sarthi Nayak, Shreyasi Asthana, Dipankar Mahapatra, Manoranjan Arakha, Suman Jha
The last decade has observed a rapid advancement in utilising biological system towards bioremediation of metal ions in the form of respective metal nanostructures or microstructures. The process may also be adopted for respective metal nanoparticle biofabrication. Among different biological methods, bacteria-mediated method is gaining great attention for nanoparticle fabrication due to their eco-friendly and cost-effective process. In the present study, silver nanoparticle (AgNP) was synthesised via continuous biofabrication using Aeromonas veronii , isolated from swamp wetland of Sunderban, West Bengal, India...
August 2018: IET Nanobiotechnology
Ponnusamy Senthil Kumar, Akshaya S Nair, Ananya Ramaswamy, Anbalagan Saravanan
The present research is focused on the removal of Zn(II) ions from aqueous solution using nano zero-valent iron impregnated cashew nut shell (NZVI-CNS). The present system was investigated in batch mode operation. NZVI-CNS was prepared by the liquid-phase reduction process. The results showed that the NZVI-CNS exhibited superior adsorption capacity for the removal of Zn(II) ions. Adsorption isotherm and kinetic models were applied to explain the nature of the adsorption process. Adsorption kinetic data followed the pseudo-first order kinetic model...
August 2018: IET Nanobiotechnology
Camila Stefanne Dias Costa, Bruno Galdeano Mello Queiroz, Richard Landers, Meuris Gurgel Carlos da Silva, Melissa Gurgel Adeodato Vieira
The alginate extraction residue (RES) from the Brazilian Sargassum filipendula was successfully employed as biosorbent in this binary equilibrium study, revealing a greater affinity and selectivity for Cr(III) than for Zn(II). Experimental results also revealed that the process is of endothermic nature and well adjusted by Langmuir-Freundlich binary model. The X-ray photoelectron spectroscopy (XPS) analysis revealed that coordination with hydroxyl groups of RES prevailed in Cr removal, followed by carboxyl-metal complexation...
August 8, 2018: Environmental Science and Pollution Research International
Loai Aljerf
Tannery industrial effluent is rich in heavy metals and basic dyes as bromocresol purple (BCP), poses an economic problem and a serious danger to the environment. This research had evaluated the importance of the adsorption properties of a modified clinoptilolite (CL) (a type of zeolite) for the removal of BCP dye and some heavy metals as total chromium (tCr) in the ammoniac phase. The modified adsorbent was prepared by mixing solid waste (SW) and CL in a ratio 10:1. The CL, SW, and CL-SW materials were characterized and the adsorption behavior of the later to BCP and tCr was completely studied...
July 31, 2018: Journal of Environmental Management
Yali Guo, Xing Xu, Yanan Shang, Baoyu Gao
Herein, we fabricated a novel carbohydrate-based adsorbent by using the pomelo peel (PP) as the biocarrier. The virgin PP was embedded with hydrous zirconium oxide (HZO) nanoparticle, forming the HZO-PP composites for highly efficient fluoride adsorption. Characteristics of HZO-PP were determined by TEM, SEM, XPS, XRD, BET surface area, and FTIR. The result showed that HZO nanoparticles have been successfully anchored onto the inner pore of PPs, which play a significant role in defluorination. It is favorable for fluoride uptake with more acidic solution, which greatly enhanced the interfacial reaction between the fluoride ions and protonated HZO through electrostatic interaction or electro-dipole interaction...
July 31, 2018: Environmental Science and Pollution Research International
Henry Cameron, Maria Teresa Mata, Carlos Riquelme
The use of microalgae in biotechnological processes has received much attention worldwide. This is primarily due to the fact that they are inexpensive to grow, requiring only sunlight and CO2 , whilst lending themselves to a range of uses, such as to reduce CO2 levels, as fish feed, in biofuel production, for the generation of secondary metabolites of interest, and in bioremediation. These features mean that microalgae are excellent candidates for the implementation of a range of eco-friendly technologies. Here, we investigated the behavior and feasibility of the use of the microalgal strain Tetraselmis marina AC16-MESO against heavy metal contamination focused on potential use in bioremediation...
2018: PeerJ
George C diCenzo, Klaudia Debiec, Jan Krzysztoforski, Witold Uhrynowski, Alessio Mengoni, Camilla Fagorzi, Adrian Gorecki, Lukasz Dziewit, Tomasz Bajda, Grzegorz Rzepa, Lukasz Drewniak
Ensifer ( Sinorhizobium ) sp. M14 is an efficient arsenic-oxidizing bacterium (AOB) that displays high resistance to numerous metals and various stressors. Here, we report the draft genome sequence and genome-guided characterization of Ensifer sp. M14, and we describe a pilot-scale installation applying the M14 strain for remediation of arsenic-contaminated waters. The M14 genome contains 6874 protein coding sequences, including hundreds not found in related strains. Nearly all unique genes that are associated with metal resistance and arsenic oxidation are localized within the pSinA and pSinB megaplasmids...
July 27, 2018: Genes
Emmanuel Abu-Danso, Sirpa Peräniemi, Tiina Leiviskä, Amit Bhatnagar
Cellulose nanofibers (CNFs) tethered with sulphur as anionic ligand were synthesized from medical absorbent cotton by dissolution with NaOH, CO(NH2 )₂ followed by mechanical intrusion of sulphur from SC(NH₂)₂ at an elevated temperature. The solid-phase CNFs embedded with sulphur complexes possessed negative sites which were used to remove cationic metals viz., Pb(II) and Cd(II) from synthetic and industrial wastewater. The physicochemical properties of the CNFs were analyzed by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), pH at point of zero charge (pHpzc ) and X-ray photoelectron spectroscopy (XPS)...
July 12, 2018: Environmental Pollution
Yanhong Zhang, Changqing Zhu, Fuqiang Liu, Yuan Yuan, Haide Wu, Aimin Li
Adsorption is one of the most widely used and effective wastewater treatment methods. The role of ionic strength (IS) in shaping the adsorption performances is much necessary due to the ubiquity of electrolyte ions in water body and industrial effluents. The influences of IS on adsorption are rather complex, because electrolyte ions affect both adsorption kinetics and thermodynamics by changing the basic characteristics of adsorbents and adsorbates. For a given adsorption system, multiple or even contradictory effects of IS may coexist under identical experimental conditions, rendering the dominant mechanism recognition and net effect prediction complicated...
July 21, 2018: Science of the Total Environment
Iulia Simona Bădescu, Dumitru Bulgariu, Iftikhar Ahmad, Laura Bulgariu
Biosorption is considered one of the most promising methods for removal of metal ions from aqueous effluents, due to its low-cost and eco-friendly characteristics. However, the exhausted biosorbents loaded with metal ions, obtained at the end of biosorption processes, are still a problem which should be solved to increase the applicability of biosorption on an industrial scale. In this study are examined three possibilities for the valorisation of exhausted biosorbents loaded with metal ions, namely: (i) regeneration and reuse of biosorbents in multiple biosorption cycles, (ii) the use of exhausted biosorbents as fertilizers for soils poor in essential microelements, and (iii) the pyrolysis of exhausted biosorbents, under well defined conditions...
October 15, 2018: Journal of Environmental Management
Zhongying Wang, Alison Sim, Jeffrey J Urban, Baoxia Mi
We investigated the removal of heavy metals from water by two-dimensional MoS2 nanosheets suspended in aqueous solution, and restacked as thin film membranes, respectively. From these studies we elucidated a new heavy metal ion removal mechanism that involves a reduction-oxidation (redox) reaction between heavy metal ions and MoS2 nanosheets. Ag+ was used as a model species and MoS2 nanosheets were prepared via chemical exfoliation of bulk powder. We found that the Ag+ removal capacity of suspended MoS2 nanosheets was as high as ∼4000 mg/g and adsorption accounted for less than 20% of removal, suggesting the reduction of Ag+ to metallic silver as a dominant removal mechanism...
August 14, 2018: Environmental Science & Technology
Yunjeong Lee, Seungki Lee, Chang Min Jin, Jung A Kwon, Taewook Kang, Inhee Choi
Assembling metallic nanoparticles and trapping target molecules within the probe volume of the incident light are important in plasmonic detection. Porous solid structures with three-dimensionally integrated metal nanoparticles would be very beneficial in achieving these objectives. Currently, porous inorganic oxides are being prepared under stringent conditions and further subjected to either physical or chemical attachment of metal nanoparticles. In this study, we propose a facile method to fabricate large-scale porous and flexible three-dimensional (3D) plasmonic networks...
August 13, 2018: ACS Applied Materials & Interfaces
Sivamani Sivalingam, Sujit Sen
Nanoporous green materials like nanozeolite has been in focus for their superb efficiency to treat industrial wastewater. The study reports ultrasound assisted hydrothermal method as a very fast method to convert industrial fly ash from different sources of eastern India to nanozeolite X for efficient removal of toxic dyes and metals from industrial effluent. The pure nanosized zeolite X was synthesized rapidly at 20 min of ultrasound treatment after alkali fusion. The efficiency of nanozeolite X was determined in terms of the adsorption capacity towards various divalent ions such as Zn2+ , Cu2+ , Cd2+ , Pb2+ , Ni2+ , Ca2+ , and Mg2+ as well as various dyes such as methylene blue, crystal violet, indigo carmine, and Congo red...
July 20, 2018: Chemosphere
Yan Wang, Ronghou Liu
The physicochemical properties and adsorption capacities of yak manure biochar (SP350-YMB) and modified yak manure biochar by H2 O2 (AC-YMB) were investigated. Results showed the oxygen content and the carboxyl group content of manure biochar increased by 63.4% and 101%, and the ash content decreased 42% after modification, respectively. Compared to SP350-YMB, the adsorption capacities of heavy metal ions (Pb2+ , Cu2+ , Cd2+ and Zn2+ ) were enhanced by AC-YMB in single-metal and multi-metal solutions. The maximum adsorption capacity of Pb2+ increased from 76...
July 1, 2018: Science of the Total Environment
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"