scholarly journals Comparison of The Sorption Kinetics of Lead(II) and Zinc(II) on Titanium Phosphate Ion-Exchanger

2020 ◽  
Vol 21 (2) ◽  
pp. 447 ◽  
Author(s):  
Marina V. Maslova ◽  
Vladimir I. Ivanenko ◽  
Nataliya Yu. Yanicheva ◽  
Natalia V. Mudruk
Keyword(s):  
Low Cost ◽  
Effective Diffusion ◽  
Kinetic Studies ◽  
Zinc Ion ◽  
Sorption Kinetics ◽  
Titanium Phosphate ◽  
Industrial Wastes ◽  
High Concentration ◽  
Fast Kinetics ◽  
Lead And Zinc

The treatment of heavy metal-contaminated wastewater is an important action to reduce The negative impacts of industrial wastes on water bodies. This work focuses on The application of a low-cost titanium (IV) phosphate sorbent of TiO(OH)H2PO42H2O chemical composition toward lead and zinc ions depending on their concentration and The temperature of The solution. The kinetic studies showed that The values of The rate of intraparticle diffusion and The effective diffusion coefficients for Zn2+ were considerably higher than those for Pb2+. To explain The difference between The sorption kinetics rates for Pb2+ and Zn2+, The effective radius and dehydration degree of The adsorbed ions were calculated. The sorbent capability of The lead and zinc ion removal and its excellent efficiency in The presence of a high concentration of calcium ions were demonstrated using simulated mine water. Due to The fast kinetics and The high exchange capacity of titanium phosphate toward divalent ions, this sorbent can be considered as a promising material for The concentration and immobilization of heavy metals into The phosphate matrix.

scholarly journals Biotechnology of Rhodococcus for the production of valuable compounds

2020 ◽  
Vol 104 (20) ◽  
pp. 8567-8594 ◽  
Author(s):  
Martina Cappelletti ◽  
Alessandro Presentato ◽  
Elena Piacenza ◽  
Andrea Firrincieli ◽  
Raymond J. Turner ◽  
...  
Keyword(s):  
Waste Disposal ◽  
Low Cost ◽  
Value Added ◽  
Industrial Wastes ◽  
Bioactive Molecules ◽  
High Concentration ◽  
Metabolic Versatility ◽  
Wide Range ◽  
Valuable Compounds ◽  
Medical Relevance

Abstract Bacteria belonging to Rhodococcus genus represent ideal candidates for microbial biotechnology applications because of their metabolic versatility, ability to degrade a wide range of organic compounds, and resistance to various stress conditions, such as metal toxicity, desiccation, and high concentration of organic solvents. Rhodococcus spp. strains have also peculiar biosynthetic activities that contribute to their strong persistence in harsh and contaminated environments and provide them a competitive advantage over other microorganisms. This review is focused on the metabolic features of Rhodococcus genus and their potential use in biotechnology strategies for the production of compounds with environmental, industrial, and medical relevance such as biosurfactants, bioflocculants, carotenoids, triacylglycerols, polyhydroxyalkanoate, siderophores, antimicrobials, and metal-based nanostructures. These biosynthetic capacities can also be exploited to obtain high value-added products from low-cost substrates (industrial wastes and contaminants), offering the possibility to efficiently recover valuable resources and providing possible waste disposal solutions. Rhodococcus spp. strains have also recently been pointed out as a source of novel bioactive molecules highlighting the need to extend the knowledge on biosynthetic capacities of members of this genus and their potential utilization in the framework of bioeconomy. Key points • Rhodococcus possesses promising biosynthetic and bioconversion capacities. • Rhodococcus bioconversion capacities can provide waste disposal solutions. • Rhodococcus bioproducts have environmental, industrial, and medical relevance.

scholarly journals Carbamoylethylated Wood Pulp as a New Sorbent for Removal of Hg (II) from Contaminated Water: Isotherm and Kinetic Studies

2020 ◽  
Author(s):  
A. Hashem ◽  
A. J. Fletcher ◽  
A. Safri ◽  
A. Ghith ◽  
D. M. Hussein
Keyword(s):  
Sorption Capacity ◽  
Low Cost ◽  
Nitrogen Concentration ◽  
Textural Properties ◽  
Kinetic Studies ◽  
Surface Heterogeneity ◽  
Sorption Process ◽  
Wood Pulp ◽  
Sorption Kinetics ◽  
Order Kinetic

Abstract Mercury is a persistent, heavy metal present in watercourses, and this paper presents the synthesis of a new, low-cost sorbent, based on wood pulp, for the targeted removal of Hg (II) from aqueous solutions. Carbamoylethylated wood pulp sorbents were obtained from the reaction of wood pulp with acrylamide, in basic media, to produce a suite of materials with varying nitrogen concentration (0.251.51%). Batch sorption techniques were used to determine the sorption capacity of each sorbent for Hg (II), as a function of pH, contact time, as well as sorbate and sorbent concentrations. The samples were evaluated for bulk and surface chemistry (nitrogen concentration and FTIR) as well as surface morphology and textural properties (SEM and surface area measurements). Sorption analysis via Langmuir, Freundlich and Temkin models, showed that the data were best represented by the Temkin isotherm model suggesting influence from surface heterogeneity in the adsorption process. Langmuir analysis provides an indication of the maximum sorption uptake at 787.6 mg g−1, while Freundlich analysis shows the sorption process to be favourable but with some slight suppression at low concentrations. The results indicate the importance of nitrogen concentration and corresponding sorption capacity in Hg (II) sorption kinetics and are consistent with the recovery rates observed. Sorption tests demonstrate that these sorbents have remarkable potential, which is validated through 39% removal of Hg (II) from aqueous solution, and modelling of the kinetic data showed that the system closely flows a pseudo-second-order kinetic model.

Challenges and strategies of zinc anode for aqueous zinc-ion batteries

2021 ◽  
Author(s):  
Weixin He ◽  
Shiyong Zuo ◽  
Xijun Xu ◽  
Liyan Zeng ◽  
Li Liu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Low Cost ◽  
Zinc Ion ◽  
Dendrite Growth ◽  
Cycling Stability ◽  
Zinc Anode ◽  
Challenges And Strategies

The obstacles of dendrite growth, hydrogen evolution, corrosion and passivation of the zinc anode seriously restrict the cycling stability of aqueous zinc-ion batteries which possess high safety and low cost.

A High-Performance Free-Standing Zn Anode for Flexible Zinc-Ion Batteries

Nanoscale ◽  
2021 ◽  
Author(s):  
Chenxi Gao ◽  
Jiawei Wang ◽  
Yuan Huang ◽  
Zixuan Li ◽  
Jiyan Zhang ◽  
...  
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Low Cost ◽  
High Energy ◽  
Zinc Ion ◽  
High Energy Density ◽  
Free Standing ◽  
Energy Device ◽  
Zn Anode ◽  
Significant Attention

Zinc-ion batteries (ZIBs) have attracted significant attention owing to their high safety, high energy density, and low cost. ZIBs have been studied as a potential energy device for portable and...

Improved photocatalytic conversion of high−concentration ammonia in water by low−cost Cu/TiO2 and its mechanism study

Chemosphere ◽  
2021 ◽  
Vol 274 ◽  
pp. 129689
Author(s):  
Jianpei Feng ◽  
Xiaolei Zhang ◽  
Guan Zhang ◽  
Ji Li ◽  
Wei Song ◽  
...  
Keyword(s):  
Low Cost ◽  
Mechanism Study ◽  
High Concentration

scholarly journals Synthesis of poly (n-butyl acrylate) with tempo by nitroxide mediated polymerization method

2021 ◽  
pp. 096739112110245
Author(s):  
Amrita Sharma ◽  
PP Pande
Keyword(s):  
Butyl Acrylate ◽  
Low Cost ◽  
Polymerization Process ◽  
Polymerization Reaction ◽  
High Concentration ◽  
Acrylate Monomer ◽  
Controlled Polymerization ◽  
Acrylate Monomers ◽  
Nitroxide Mediated Polymerization ◽  
Polymerization Method

It has been observed that acrylate monomers are very difficult to polymerize with the low cost nitroxide catalyst 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO). Therefore, costly acyclic nitroxides such as N-tert-butyl-N-(1-diethylphosphono-2,2-dimethyl)-N-oxyl, (SG1), 2,2,5-Trimethyl-4-phenyl-3-azahexane-3-nitroxide (TIPNO) and TIPNO derivatives have to be used for the polymerization of the acrylic acid derivatives. There are very few reports on the use of TEMPO-derivatives toward the polymerization of n-butyl acrylate. Generally different reducing agents viz. glucose, ascorbic acid, hydroxyacetone etc. have been used to destroy excess TEMPO during the polymerization reaction. The acrylate polymerizations fail in the presence of TEMPO due to the strong C–O bond formed between the acrylate chain end and nitroxide. To the best of our knowledge, no literature report is available on the use of TEMPO without reducing agent or high temperature initiators, toward the polymerization of n-butyl acrylate. The present study has been carried out with a view to re-examine the application of low cost nitroxide TEMPO, so that it can be utilized towards the polymerization of acrylate monomers (e.g. n-butyl acrylate). We have been able to polymerize n-butyl acrylate using the nitroxide TEMPO as initiator (via a macroinitiator). In this synthesis, a polystyrene macroinitiator was synthesized in the first step from TEMPO, after this TEMPO end-capped styrene macroinitiator (PSt-TEMPO) is used to polymerize n-butyl acrylate monomer. The amount of macroinitiator taken was varied from 0.05% to 50% by weight of n-butyl acrylate monomer. The polymerization was carried out at 120°C by bulk polymerization method. The experimental findings showed a gradual increase in molecular weight of the polymer formed and decrease in the polydispersity index (PDI) with increase in amount of PSt-TEMPO macroinitiator taken. In all experiments conversion was more than 80%. These results indicate that the polymerization takes place through controlled polymerization process. Effect of different solvents on polymerization has also been investigated. In the following experiments TEMPO capped styrene has been used as macroinitiator leading to the successful synthesis of poly n-Butyl acrylate. It has been found that styrene macroinitiator is highly efficient for the nitroxide mediated polymerization, even in very small concentration for the synthesis of poly n-butyl acrylate. High concentration of macroinitiator results in the formation of block copolymers of polystyrene and poly ( n-butyl acrylate) viz. polystyrene-block-poly-( n-butyl acrylate). The use of TEMPO toward controlled polymerization is of much importance, because it is the nitroxide commercially available at the lowest cost.

Electrochemically induced structural reconstruction in promoting Zn storage performances of CaMn3O6 cathode for superior long life aqueous Zn-ion battery

2021 ◽  
Author(s):  
peisheng guo ◽  
gongzheng yang ◽  
Chengxin Wang
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Storage Systems ◽  
Low Cost ◽  
Zinc Ion ◽  
Manufacturing Processes ◽  
Energy Storage Systems ◽  
Long Life

Aqueous zinc-ion batteries (AZIBs) have been regarded as alternative and promising large-scale energy storage systems due to their low cost, convenient manufacturing processes, and high safety. However, their development was...

scholarly journals Catalytic wet oxidation of high concentration pharmaceutical wastewater with Fe3+ as catalyst

2018 ◽  
Vol 2017 (3) ◽  
pp. 661-666
Author(s):  
Xu Zeng ◽  
Jun Liu ◽  
Jianfu Zhao
Keyword(s):  
Oxygen Pressure ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Kinetic Studies ◽  
Cod Removal ◽  
Wet Oxidation ◽  
Catalytic Wet Oxidation ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Temperature Time

Abstract Catalytic wet oxidation of high concentration pharmaceutical wastewater with Fe3+ as catalyst was carried out in a batch reactor. Results showed that the degradation of pharmaceutical wastewater was enhanced significantly by Fe3+. The effects of reaction parameters, such as the catalyst dose, reaction temperature, time, and initial oxygen pressure, were discussed. The chemical oxygen demand (COD) removal increased with the increases of catalyst dose, temperature, time and oxygen supply. With the initial COD 34,000–35,000 mg/L, approximately 70% COD removal can be achieved under the conditions of catalyst 1.0 g and oxygen pressure 1.0 MPa at 250 °C after 60 min. The results of kinetic studies showed that two reaction steps existed in this oxidation process, which followed an apparent first-order rate law. This process provides an effective approach for the pretreatment of high concentration pharmaceutical wastewater.

Microbial-Induced Mineralization of Zinc Ions Based on the Degradation of Toluene and Its Characterization

2021 ◽  
Vol 13 (4) ◽  
pp. 656-661
Author(s):  
Yiyan Lv ◽  
Qiwei Zhan ◽  
Xiaoniu Yu
Keyword(s):  
Particle Size ◽  
Phase Composition ◽  
Surface Morphology ◽  
Organic Compounds ◽  
Low Cost ◽  
Zinc Ion ◽  
Zinc Ions ◽  
Quick Response ◽  
Zinc Carbonate ◽  
Carbonate Ions

Microbial-induced degradation of aromatic organic compounds and mineralization of zinc ions have attracted much attention because of its low cost, simple operation and quick response. This research, toluene was decomposed and made the concentration of carbonate ions increased accordingly by the enzymatic pressing of microorganisms, meanwhile carbonate ions mineralized zinc ions into carbonate precipitations. The composition and microstructure were analyzed systematically. The analysis results indicated that carbonate precipitations, basic zinc carbonate, could be successfully prepared by microbial method. The particle size of basic zinc carbonate was nanometer, and its shape was near-spherical. Furthermore, the phase composition, functional groups and surface morphology of the precipitations prepared by different methods were basically the same. This work provided a new method for remediation of zinc ion pollution based on the degradation of toluene.

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