scholarly journals Synthesis, Characterization of Copper Metavanadate (CuV2O6) Nanostructures Via Hydrothermal Method and their Photocatalytic Performance

2018 ◽  
Vol 34 (3) ◽  
pp. 1263-1269
Author(s):  
S. Rajendra ◽  
Prasad Prasad ◽  
S. Srikantaswamy ◽  
K. Jagadish ◽  
M. R. Abhilash ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Photocatalytic Performance ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Research Work ◽  
Morphological Properties ◽  
Synthetic Wastewater ◽  
Methyl Red ◽  
Red Dye

The nanostructures with different morphology have enormous applications in science and technology field, due to its vast advantages over normal materials. Here in, the research work has been carried out for the synthesis of novel nanostructures via hydrothermal method. The selection of nanomaterials was started with focus on the transition metal vanadates with high photocatalytic activity. The present work was carried out for the synthesis of copper metavanadates (CuV2O6) with different morphology like spherical and leaf like nanoparticle by hydrothermal method. The crystalinity and morphological properties were analyzed by using advanced instruments XRD and SEM respectively. Further, the photocatalytic properties of synthesized nanoparticle was investigated by made treatment with synthetic wastewater which contains the methyl red dye and heavymetals in it. The treatment was carried out for the different concentration of catalyst, methyl red dye, and heavymetals. However the effect of concentration of catalyst, pH, Dye concentration and heavymetal concentration was also investigated and founded the optimum concentration for the dye degradation and heavy metal removal simultaneously. This copper metavanadate with different morphology has high photocatalytic performance and the results were obtained with high efficiency.

Application of Immobilized Fungi Phanerochaete chrysosporium in Removal of Heavy-Metals from Wastewater

2013 ◽  
Vol 779-780 ◽  
pp. 1674-1677 ◽  
Author(s):  
Dan Lian Huang ◽  
Guang Ming Zeng ◽  
Piao Xu ◽  
Cui Lai ◽  
Mei Hua Zhao ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Phanerochaete Chrysosporium ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Removal Of Heavy Metals ◽  
Iron Oxide Magnetic Nanoparticles ◽  
Ca Alginate

Immobilized microbe technologies are expected to be effectively used in wastewater treatment. Removal of heavy-metals from wastewater by immobilized Phanerochaete chrysosporium (Pc) with Ca-alginate and iron oxide magnetic nanoparticles (MNPs) was studied. The results showed that a biosorbent as Pc immobilized by Ca-alginate and iron oxide magnetic nanoparticles was successfully developed. And the iron oxide magnetic nanoparticles played an important role in the increase of biosorption capacity of Pc. Energy dispersive spectrometer (EDS) analysis confirmed that metal ions adsorbed to the surface of the biosorbents were partly transmitted to the interior of biosorbents, mainly embedded with iron oxide nanoparticles and Ca-alginate. Moreover, it was found that MNPs-Ca-alginate immobilized Pc showed a good affinity to various heavy metals, such as Pb(II), Zn(II), Cd(II) or Mg(II) and so on. The results proved the high efficiency of the biosorbents for heavy-metal removal and its potential application in the treatment of metal-containing wastewater.

scholarly journals Alginate Production from Alternative Carbon Sources and Use of Polymer Based Adsorbent in Heavy Metal Removal

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Çiğdem Kıvılcımdan Moral ◽  
Merve Yıldız
Keyword(s):  
Metal Removal ◽  
Low Cost ◽  
Bacterial Species ◽  
Heavy Metal Removal ◽  
Carbon Sources ◽  
Synthetic Wastewater ◽  
Alginate Production ◽  
Mannuronic Acid ◽  
Study Results ◽  
The Cost

Alginate is a biopolymer composed of mannuronic and guluronic acids. It is harvested from marine brown algae; however, alginate can also be synthesized by some bacterial species, namely,AzotobacterandPseudomonas. Use of pure carbohydrate sources for bacterial alginate production increases its cost and limits the chance of the polymer in the industrial market. In order to reduce the cost of bacterial alginate production, molasses, maltose, and starch were utilized as alternative low cost carbon sources in this study. Results were promising in the case of molasses with the maximum 4.67 g/L of alginate production. Alginates were rich in mannuronic acid during early fermentation independent of the carbon sources while the highest guluronic acid content was obtained as 68% in the case of maltose. The polymer was then combined with clinoptilolite, which is a natural zeolite, to remove copper from a synthetic wastewater. Alginate-clinoptilolite beads were efficiently adsorbed copper up to 131.6 mg Cu2+/g adsorbent at pH 4.5 according to the Langmuir isotherm model.

Effective Removal of Lead from Solution by Sulfate Reducing Bacteria Cultured with Sugar Byproducts

2020 ◽  
Vol 14 (3) ◽  
pp. 384-395
Author(s):  
Juan Yin ◽  
Chao-Bing Deng ◽  
Hongxiang Zhu ◽  
Jianhua Xiong ◽  
Zhuo Sun
Keyword(s):  
High Efficiency ◽  
Metal Removal ◽  
Low Cost ◽  
Heavy Metal Removal ◽  
Carbon Sources ◽  
Sulfate Reducing Bacteria ◽  
Lead Removal ◽  
Sulfate Reducing ◽  
Reducing Bacteria ◽  
Filter Mud

Sulfate reducing bacteria (SRB) are widely used to remove heavy metals because of their high efficiency. However, the metabolic processes of SRB require additional carbon sources, and the development of low-cost carbon sources has gradually attracted attention. The utilization of sugar byproduct resources, as the low-cost carbon sources, has great practical significance for environmentally sustainable development in Guangxi, China. This study aims to cultivate SRB with low-cost sugar byproducts, apply them to controlling a lead-polluted environment, and study the effects and mechanisms of controlling lead pollution. The research results show that the best culture effect of SBR can be obtained by mixing the filter mud and vinasse in a ratio of 1:1 to 3:1. SRB have average lead removal rates of more than 96.97% in solutions with different lead concentration of 10∼100 mg/L, and SRB have a higher tolerance to high concentrations of lead due to factors such as the organic substance composition of sugar byproducts and the porosity of filter mud. Scanning electron microscopy combined with energy dispersive spectrometry and X-ray diffraction analysis show that SRB mainly cause Pb2+ to form PbS precipitate through redox reactions to remove lead from the solution. Therefore, low-cost filters of a mud and vinasse mixture can be used as a medium for SRB and exhibit high heavy metal removal efficiency, thus providing a new utilization of filter mud and vinasse.

scholarly journals Biosorption of Zn(II) in High and Low Strength Synthetic Wastewater by Watermelon Rind (Citrullus lanatus)

2015 ◽  
Vol 773-774 ◽  
pp. 1286-1290 ◽  
Author(s):  
M.F.H. Azizul-Rahman ◽  
A.A. Mohd Suhaimi ◽  
Norzila Othman
Keyword(s):  
Heavy Metal ◽  
Contact Time ◽  
Metal Removal ◽  
Citrullus Lanatus ◽  
Heavy Metal Removal ◽  
High Strength ◽  
Synthetic Wastewater ◽  
Watermelon Rind ◽  
Optimum Ph ◽  
Low Strength

The heavy metal contain in the industrial wastewater can cause a pollution towards the environment and human due to its toxicity. Therefore extensive studies were conducted for the heavy metal removal. This study was conducted under several conditions by varying pH, biosorbent dosage, initial wastewater concentration and contact time. The results revealed that optimum pH, for high strength synthetic wastewater was 8.0 meanwhile for low strength synthetic wastewater was 7.0. Both high and low strength synthetic wastewater was optimum at 30 minutes of contact time with 1.5g and 0.02g of bisorbent dosage respectively. Meanwhile, the optimum initial metal concentration for high and low strength synthetic wastewater was 400ppm and 1ppm respectively. The results had proven that watermelon rind is able to treat wastewater with high and low concentration of metal.

SIMPLE SYNTHESIS OF UNIFORM α-Fe2O3 MICROSPHERES WITH EXCELLENT PHOTOCATALYTIC PERFORMANCE USING POLY (N-VINYL-2-PYRROLIDONE)

NANO ◽  
2013 ◽  
Vol 08 (05) ◽  
pp. 1350053 ◽  
Author(s):  
TING-TING ZHANG ◽  
TING-TING GUO ◽  
ZHI-PING WU ◽  
SI-WEI YANG ◽  
ZHOU-FENG WANG ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrothermal Method ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
High Efficiency ◽  
Simple Approach ◽  
Simple Synthesis ◽  
Facile Hydrothermal Method

In this paper, a new simple approach has been developed for the preparation of α- Fe 2 O 3 microspheres by a facile hydrothermal method using PVP as a surfactant. Uniform α- Fe 2 O 3 microspheres could be routinely synthesized through solvothermal approach by controlling the PVP/ FeCl 3⋅6 H 2 O ratio. The as-obtained α- Fe 2 O 3 microspheres exhibit high efficiency on the decolorization of RhB aqueous solution in the presence of H 2 O 2 at room temperature.

Mixed heavy metal removal from wastewater by using discarded mushroom-stick biochar: adsorption properties and mechanisms

2019 ◽  
Vol 21 (3) ◽  
pp. 584-592 ◽  
Author(s):  
Xinhua Wang ◽  
Xin Li ◽  
Guangqing Liu ◽  
Yanfeng He ◽  
Chang Chen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Adsorption Properties ◽  
Morphological Properties

The physicochemical and morphological properties and the sorption capacities of discarded mushroom-stick biochar (DMB) prepared at different pyrolysis temperatures from 300 °C to 800 °C were explored.

scholarly journals Comparison of the experimental results with the Langmuir and Freundlich models for copper removal on limestone adsorbent

2019 ◽  
Vol 9 (8) ◽  
Author(s):  
Thair Sharif Khayyun ◽  
Ayad Hameed Mseer
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Equilibrium Concentration ◽  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Batch Adsorption ◽  
Empirical Constant

Abstract The purpose of this study was to investigate the possibility of the limestone as an adsorbed media and low-cost adsorbent. Batch adsorption studies were conducted to examine the effects of the parameters such as initial metal ion concentration C0, particle size of limestone DL, adsorbent dosage and equilibrium concentration of heavy metal Ce on the removal of the heavy metal (Cu) from synthetic water solution by limestone. The removal efficiency is increased with the increase in the volume of limestone (influenced by the media specific area). It has been noted that the limestone with diameter of 3.75 is the most effective size for removal of copper from synthetic solution. The adsorption data were analyzed by the Langmuir and Freundlich isotherm model. The average values of the empirical constant and adsorption constant (saturation coefficient) for the Langmuir equation were a = 0.022 mg/g and b = 1.46 l/mg, respectively. The average values of the Freundlich adsorption constant and empirical coefficient were Kf = 0.010 mg/g and n = 1.58 l/mg, respectively. It was observed that the Freundlich isotherm model described the adsorption process with high coefficient of determination R2, better than the Langmuir isotherm model and for low initial concentration of heavy metal. Also, when the values of amount of heavy metal removal from solution are predicted by the Freundlich isotherm model, it showed best fits the batch study. It is clear from the results that heavy metal (Cu) removal with the limestone adsorbent appears to be technically feasible and with high efficiency.

A high-efficiency Fe2O3@Microalgae composite for heavy metal removal from aqueous solution

2020 ◽  
Vol 33 ◽  
pp. 101026 ◽  
Author(s):  
Li Shen ◽  
Junjun Wang ◽  
Zhanfei Li ◽  
Ling Fan ◽  
Ran Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal

Photocatalytic Performance Evaluation of Bismuth Doped Tin-Dioxide under UV and Direct Sunlight Irradiation for Congo Red Dye Degradation

2020 ◽  
Vol 42 (5) ◽  
pp. 687-687
Author(s):  
Nauman Ali Nauman Ali ◽  
Adnan khan Adnan khan ◽  
Aaisha Riaz Aaisha Riaz ◽  
Abdullah M Asiri and Tahseen Kamal Abdullah M Asiri and Tahseen Kamal
Keyword(s):  
Photocatalytic Degradation ◽  
Congo Red ◽  
Tin Dioxide ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Sno2 Nanoparticles ◽  
Research Work ◽  
Precipitation Method ◽  
Congo Red Dye ◽  
Red Dye

In the current research work, bismuth doped tin-dioxide (Bi-SnO2) was prepared by wet chemical co-precipitation method. The synthesized material was used as a photocatalyst in the degradation of congo red dye (CR) in its aqueous solution. The prepared catalyst was used in the uncalcined- and calcined forms for the photocatalytic reaction. The synthesized catalyst in both forms was characterized by UV-visible spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The XRD revealed that the calcination of the Bi-SnO2 improved its crystallinity. The SEM showed that the Bi-SnO2 had average size less than 150nm. Photocatalytic degradation of CR dye was carried out under ultra-violet light as well as under sunlight. While testing the photocatalytic degradation performance, it was found that more than 80% of the CR was degraded by using Bi-SnO2 nanoparticles under both lighting conditions. Moreover, the calcined Bi-SnO2 nanoparticles showed better photocatalytic performance as compared to its uncalcined form. The present work provides a viable way to make efficient photocatalyst based-on Bi-SnO2 to employ under UV and sunlight for the degradation of the CR dye without the need of oxidizing or reducing agents.

Synthesis and characterization of acrylic acid-2-hydroxyethyl methacrylate IPN hydrogels

RSC Advances ◽  
2015 ◽  
Vol 5 (93) ◽  
pp. 75870-75880 ◽  
Author(s):  
Rabin Bera ◽  
Ayan Dey ◽  
Arpan Datta sarma ◽  
Debabrata Chakrabarty
Keyword(s):  
Heavy Metal ◽  
Acrylic Acid ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Morphological Properties ◽  
Synthesis And Characterization ◽  
Hydroxyethyl Methacrylate ◽  
Poly Acrylic Acid

Three different methods have been developed to crosslink the poly(acrylic acid-2-hydroxyethyl methacrylate) to form the hydrogels having tunable swelling, rheological and morphological properties with applicability in dye and heavy metal removal.

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