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Removal Of Metal Ions

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https://www.readbyqxmd.com/read/30342403/removing-cr-vi-in-water-via-visible-light-photocatalytic-reduction-over-cr-doped-srtio-3-nanoplates
#1
Dong Yang, Xuyang Zhao, Xiaoyan Zou, Zhiyuan Zhou, Zhongyi Jiang
It is crucial to develop a high-efficiency visible-light responsive photocatalyst for settling the increasing contamination stemmed from toxic heavy metal ions in wastewater. In this study, Cr-doped SrTiO3 (CrSTO) nanoplates were synthesized by a facile one-pot solvothermal method with ethylene glycol as both the solvent and morphology controller. The resultant CrSTO nanoplates are about 100 nm in size and 20 nm in thickness, which are composed of SrTiO3 nanocrystals about 19 nm in diameter. Furthermore, they possess the mesopore 3...
October 15, 2018: Chemosphere
https://www.readbyqxmd.com/read/30340672/wastewater-degradation-by-iron-copper-nanoparticles-and-the-microorganism-growth-rate
#2
Tareq W M Amen, Osama Eljamal, Ahmed M E Khalil, Nobuhiro Matsunaga
Nowadays, trends in wastewater treatment by zero-valent iron (ZVI) were turned to use bimetallic NZVI particles by planting another metal onto the ZVI surface to increase its reactivity. Nano size zero-valent iron/copper (NZVI/Cu0 ) bimetallic particles were synthesized in order to examine its toxicity effects on the wastewater microbial life, kinetics of phosphorus, ammonia stripping and the reduction of chemical oxygen demand (COD). Various concentrations of NZVI/Cu0 and operation conditions both aerobic and anaerobic were investigated and compared with pure NZVI experiment...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340005/chitosan%C3%A2-g%C3%A2-maleic-acid-for-effective-removal-of-copper-and-nickel-ions-from-their-solutions
#3
Ahmed G Ibrahim, Alaaeldine Sh Saleh, Emad M Elsharma, Essam Metwally, Tharwat Siyam
Pollution of the environment associated with discharging the toxic heavy metals in water makes us focus the light to solve this problem. In continuation of our efforts, we aim in this work to utilize the graft copolymer (chitosan‑g‑maleic acid) to purify water from copper and nickel ions. The graft copolymer has been synthesized using gamma radiation and the grafting conditions have been optimized by studying the influence of acetic acid concentration (0.5-10% V/V), monomer concentration (5-17.5% w/v), chitosan concentration (0...
October 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30339539/utilization-of-pleurotus-eryngii-biosorbent-as-an-environmental-bioremedy-for-the-decontamination-of-trace-cadmium-ii-ions-from-water-system
#4
Farah Amin, Farah Naz Talpur, Aamna Balouch, Muhammad Kashif Samoon, Hassan Imran Afridi, Muhammad Ali Surhio
In many parts of the world, cadmium metal concentration in drinking water is higher than some international guideline values. To reduce its level below the safety limit, a sustainable and environmental friendly approach is crucial. Thereby, present article introduce an efficient, non-pathogenic and a novel fungal biosorbent Pleurotus eryngii for the removal of Cd(II) ions from aqueous system. The efficiency of P. eryngii were improved and optimized by investigating many significant factors such as; pH, biosorbent dose, initial Cd(II) ion concentration, temperature and contact time...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30339533/comparison-of-the-photocatalytic-performance-of-tio-2-ac-and-tio-2-cnt-nanocomposites-for-methyl-orange-photodegradation
#5
Liping Wang, Jingru Guo, Jingjing Dang, Xiaojun Huang, Si Chen, Weisheng Guan
To enhance the photocatalytic degradation efficiency of TiO2 on methyl orange (MO) removal, TiO2 /AC (activated carbon) and TiO2 /CNT (carbon nanotube) composites were synthesized. The prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The photocatalytic performance of the obtained composites were investigated by the degradation of MO under UV irradiation (254 nm, 365 nm). The results revealed that the prepared nanocomposite showed higher MO degradation efficiency than pure nano-TiO2 ...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30336006/polyaniline-nanofiber-electrodes-for-reversible-capture-and-release-of-mercury-ii-from-water
#6
Yoonseob Kim, Zhou Lin, Intak Jeon, Troy Van Voorhis, Timothy M Swager
π-Conjugated polyaniline nanofiber networks are an attractive material platform for reversible and selective capture and release of toxic heavy metal ions from water. The nanofiber geometry facilitates fastsorption kinetics, sulfur functionalization of the backbone for improved adsorption, and electrochemical control of the oxidation (charge) state for reversible triggered sorption/desorption of metal ions. These active materials also function as sensors in that the sorption of mercury ions can be detected by analysis of cyclic voltammograms...
October 18, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/30326337/the-stability-of-the-compounds-formed-in-the-process-of-removal-pb-ii-cu-ii-and-cd-ii-by-steelmaking-slag-in-an-acidic-aqueous-solution
#7
Liyun Yang, Tingting Wen, Liping Wang, Takahiro Miki, Hao Bai, Xin Lu, Huafang Yu, Tetsuya Nagasaka
The potential feasibility of steel slag as a low cost removal agent for heavy metal ions Pb(II), Cu(II) and Cd(II) in acidic conditions was investigated in this study. The initial pH effect on heavy metal ion removal efficiency, the compounds formed after heavy metal ion removal, and the binding force of metals with the compounds were determined. The results showed that the efficiency of removing heavy metal ions by steel slag was low at low initial pH levels, yet it sharply increased and then became stable as the initial pH increased...
October 13, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/30321205/a-comprehensive-analysis-of-biosorption-of-metal-ions-by-macroalgae-using-icp-oes-sem-edx-and-ftir-techniques
#8
Izabela Michalak, Małgorzata Mironiuk, Krzysztof Marycz
In the present study, a comprehensive approach to the biosorption process was proposed. Biosorption of Cr(III), Mn(II) and Mg(II) ions by a freshwater macroalga Cladophora glomerata was examined using several advanced techniques including FTIR (Fourier Transform Infrared Spectroscopy), ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometry) and SEM-EDX (Scanning Electron Microscopy with Energy Dispersive X-Ray Spectroscopy). The enriched biomass can become a valuable, bioactive feed additive for different breeds of animals...
2018: PloS One
https://www.readbyqxmd.com/read/30318157/characteristics-and-mechanisms-of-cadmium-adsorption-onto-biogenic-aragonite-shells-derived-biosorbent-batch-and-column-studies
#9
Huu Tap Van, Lan Huong Nguyen, Van Dang Nguyen, Xuan Hoan Nguyen, Thanh Hai Nguyen, Tien Vinh Nguyen, Saravanamuth Vigneswaran, Jörg Rinklebe, Hai Nguyen Tran
Calcium carbonate (CaCO3 )-enriched biomaterial derived from freshwater mussel shells (FMS) was used as a non-porous biosorbent to explore the characteristics and mechanisms of cadmium adsorption in aqueous solution. The adsorption mechanism was proposed by comparing the FMS properties before and after adsorption alongside various adsorption studies. The FMS biosorbent was characterized using nitrogen adsorption/desorption isotherm, X-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy, Fourier-transform infrared spectroscopy, and point of zero charge...
October 11, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/30315530/using-phytoremediation-by-decaying-leaves-and-roots-of-reed-phragmites-austrates-plant-uptake-to-treat-polluted-shallow-groundwater-in-kuwait
#10
Hana'a Burezq, Amjad Aliewi
Phytoremediation is the use of plants and their associated microorganisms, to remove or degrade biochemically the pollutants from the soil and groundwater environment. It is an emerging technology for water/soil/agricultural remediation, which offers a low-cost flexible technique suitable for use against a number of different types of contaminants in a variety of media. This research illustrates that this technology can be used to reduce the concentration of pollutants in Kuwait shallow groundwater to improve the efficiency of irrigation for greenery purposes...
October 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30315528/molecular-design-of-macrocyclic-compounds-for-complete-removal-of-thallium-i-from-wastewater
#11
Zhuo Zhao, Huan Tian, Menglong Zhang, Yongxiang Yang, Hongliang Zhang
Design of new adsorbents for complete removal of thallium(I) from wastewater is of significant importance. Based on the theory of binding ability between crown ether and metal ion, a kind of Tl(I)-selected crown ether, thio-18-crown-6 ether, was designed. Subsequently, modeling calculations were performed to investigate the microscopic interaction between 18-crown-6 ether and its sulfur-substituted derivatives with Tl+ . The results showed that thio-18-crown-6 ether generally showed higher affinity to Tl+ than 18-crown-6...
October 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30311734/ultrafast-removal-of-cd-ii-by-green-cyclodextrin-metal-organic-framework-based-nanoporous-carbon-adsorption-mechanism-and-application
#12
Chang Liu, Peng Wang, Xueke Liu, Xiaotong Yi, Donghui Liu, Zhiqiang Zhou
Heavy metals contaminated water has been identified as a significant threat to human health. To develop safe and rapid water treatment techniques is necessary. Herein, we synthesized an eco-friendly γ-cyclodextrin MOF-based nanoporous carbon (γ-CD MOF-NPC) material and conducted comprehensive characterization, and found its rapid and effective Cd(II) removal capacity. The γ-CD MOF-NPC could effectively sequester most of cadmium ions within 1 min, and it still demonstrated excellent adsorption ability under various conditions, including different pH, adsorbent dosage and coexisting ions...
October 12, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/30310908/acylhydrazone-functionalized-benzimidazole-based-metallogel-for-the-efficient-detection-and-separation-of-cr-3
#13
Hong Yao, Jiao Wang, Qi Zhou, Xiao-Wen Guan, Yan-Qing Fan, You-Ming Zhang, Tai-Bao Wei, Qi Lin
Chromium(iii) is a kind of microelement and can be converted to the more toxic chromium(vi), which is a carcinogen, by redox cycling. Thus, the development of novel materials for the detection and removal of Cr3+ is a very important issue. A novel metallogel chemosensor (BMG-Fe) based on functionalized benzimidazole (BM) and Fe3+ was constructed, which could fluorescently detect and separate Cr3+. The detection limit of BMG-Fe for Cr3+ is 2.62 × 10-8 M, and it exhibited high sensitivity and selectivity for Cr3+...
October 12, 2018: Soft Matter
https://www.readbyqxmd.com/read/30307449/coordination-structure-conversion-of-protonated-bisporphyrinato-terbium-iii-double-decker-complexes-and-creation-of-a-kondo-assembly-by-electron-injection-on-the-au-111-surface
#14
Tomoko Inose, Daisuke Tanaka, Jie Liu, Mizu Kajihara, Puneet Mishra, Takuji Ogawa, Tadahiro Komeda
The first step towards the synthesis of single-molecule magnet (SMM)-based spintronics devices is the organization and manipulation of magnetic molecules on surfaces. Our previous studies on bulk crystals demonstrated that protonated porphyrinato double-decker complexes [Tb(Hoep)(oep)] (oep = 2,3,7,8,12,13,17,18-octaethylporphyrinato) are not SMMs; however, once a hydrogen is removed to produce their neutral radical forms, [Tb(oep)2], they convert to SMMs. These intriguing properties encouraged us to examine the electronic/spin properties of these complexes and their chemical conversion ability after their transfer onto a metal substrate, similar to the environment required for the practical application of SMMs...
October 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/30303465/enhanced-immobilization-of-mercury-ii-from-desulphurization-wastewater-by-edta-functionalized-graphene-oxide-nanoparticles
#15
Jiaxing Sun, Heng Chen, Dongxu Qi, Hao Wu, Changsong Zhou, Hongmin Yang
Graphene oxide (GO) is a new promising nanometer material in a superconductor and wastewater heavy metal ions removal for its functionalized groups. Ethylenediaminetetraacetic acid functionalized graphene oxide complexes (EDTA-GO) was produced by a realizable silanization chemical reaction. Characteristics of Hg(II) removal in desulphurization wastewater was also under investigation. The chemical composition and microstructures of the EDTA-GO adsorbents were characterized by X-ray photoelectron spectroscopy (XPS), Transmission electron microscope (TEM), Scanning Electron Microscopy (SEM) analyses...
October 10, 2018: Environmental Technology
https://www.readbyqxmd.com/read/30302321/adsorptive-removal-of-noxious-cadmium-from-aqueous-solutions-using-poly-urea-formaldehyde-a-novel-polymer-adsorbent
#16
Mohammad Hadi Dehghani, Samira Tajik, Ahmad Panahi, Mostafa Khezri, Ahmad Zarei, Zoha Heidarinejad, Mahmood Yousefi
Cadmium is a heavy metal toxic that enters water resources through industrial, household, agricultural waste and non-sanitary landfill of urban and industrial wastes. Pollution of water resources by cadmium increases incidence of diseases including Itai-Itai, kidney disorders, cancer, chromosome effects and kidney tubular damages in low exposures. The aim of this study is to study the efficiency of a new poly urea-formaldehyde adsorbent in the removal cadmium ions from aqueous solutions. The effect of different variables such as initial pH, contact time, initial concentration of cadmium and test of real wastewater samples were evaluated...
2018: MethodsX
https://www.readbyqxmd.com/read/30293027/a-biomimetic-sio-2-chitosan-composite-as-highly-efficient-adsorbent-for-removing-heavy-metal-ions-in-drinking-water
#17
Jinyun Liu, Yu Chen, Tianli Han, Mengying Cheng, Wen Zhang, Jiawei Long, Xiangqian Fu
Highly efficient adsorbents for drinking water purification are demanded since the contaminants are generally in a low concentration which makes it difficult for conventional adsorbents. Herein, we present a novel biomimetic SiO2 @chitosan composite as adsorbent with a high adsorption capability towards heavy metal ions including As(V) and Hg(II). The hollow leaf-like SiO2 scaffold within the adsorbent has a stable chemical property; while on the surface SiO2 , the chitosan nanoparticle provide a large amount of active sites such as amino and hydroxyl groups for adsorbing heavy metal ions...
October 2, 2018: Chemosphere
https://www.readbyqxmd.com/read/30291614/removal-of-vanadium-and-palladium-ions-by-adsorption-onto-magnetic-chitosan-nanoparticles
#18
Maryam Omidinasab, Nadereh Rahbar, Mehdi Ahmadi, Babak Kakavandi, Farshid Ghanbari, George Z Kyzas, Susana Silva Martinez, Neemat Jaafarzadeh
Chitosan (CS), synthesized from chitin chemically extracted from shrimp shells, was used for the synthesis of magnetic chitosan nanoparticles (Fe3 O4 -CSN), which makes the adsorbent easier to separate. Fe3 O4 -CSN was used for the removal of toxic metals such as vanadium (V(V)) and palladium (Pd(II)) ions from aqueous solutions. Influencing factors on the adsorption process such as pH, contact time, adsorbent dosage, and agitation speed were investigated. A competitive adsorption of V(V) and Pd(II) ions for the active sites was also studied...
October 6, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30290871/a-green-method-to-synthesize-flowerlike-fe-oh-3-microspheres-for-enhanced-adsorption-performance-toward-organic-and-heavy-metal-pollutants
#19
Xiaole Zhao, Yingchun Su, Shubin Li, Yajun Bi, Xiaojun Han
Dyestuffs and heavy metal ions in water are seriously harmful to the ecological environment and human health. Three-dimensional (3D) flowerlike Fe(OH)3 microspheres were synthesized through a green yet low-cost injection method, for the removal of organic dyes and heavy metal ions. The Fe(OH)3 microspheres were characterized by thermal gravimetric analysis (TGA), Fourier transform infrared (FT-IR), and transmission electron microscopy (TEM) techniques. The adsorption kinetics of Congo Red (CR) on Fe(OH)3 microspheres obeyed the pseudo-second-order model...
November 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30290867/facile-one-step-synthesis-of-functionalized-biochar-from-sustainable-prolifera-green-tide-source-for-enhanced-adsorption-of-copper-ions
#20
Yuan Gao, Xiuzhen Zhu, Qinyan Yue, Baoyu Gao
The use of biochars formed by hydrothermal carbonization for the treatment of contaminated water has been greatly limited, due to their poorly developed porosity and low content of surface functional groups. Also, the most common modification routes inevitably require post-treatment processes, which are time-consuming and energy-wasting. Hence, the objective of this research was to produce a cost-effective biochar with improved performance for the treatment of heavy metal pollution through a facile one-step hydrothermal carbonization process coupled with ammonium phosphate, thiocarbamide, ammonium chloride or urea, without any post-treatment...
November 2018: Journal of Environmental Sciences (China)
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