Removal of Heavy Metals by Poly(Vinyl Pyrrolidone)/Laponite Nanocomposite Hydrogels

2013 ◽  
Vol 631-632 ◽  
pp. 291-297
Author(s):  
Yan Ming Wang ◽  
Da Ji Shang ◽  
Zhong Wei Niu
Keyword(s):  
Heavy Metals ◽  
Freeze Drying ◽  
In Situ Polymerization ◽  
Ion Concentration ◽  
Vinyl Pyrrolidone ◽  
Potential Candidate ◽  
Nanocomposite Hydrogels ◽  
Removal Of Heavy Metals ◽  
Poly Vinyl Pyrrolidone

Laponite cross-linked poly(vinyl pyrrolidone) (PVP) hydrogels were fabricated by in situ polymerization of vinyl pyrrolidone (NVP). Macroporous PVP/Laponite nanocomposite hydrogels were obtained by freeze drying of hydrogels, which exhibited faster adsorption kinetics than ambient-dried ones. We also investigated the influence of laponite content, initial ion concentration and pH of the solution on the adsorption capacity of PVP/Laponite hydrogels. Moreover, the PVP/Lapnoite hydrogels can further be fabricated into powder hydrogel samples, which can be used as a potential candidate of adsorbent for removal of heavy metals in water.

In Situ Synthesis of Size-Controlled Silver/Poly(Methyl Methacrylate) Nanocomposite

2017 ◽  
Vol 727 ◽  
pp. 514-518
Author(s):  
Chun Gu ◽  
Guo Qiang Luo ◽  
Rui Zhi Zhang ◽  
Jian Zhang ◽  
Yuan Li ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Trace Amount ◽  
Reaction System ◽  
Vinyl Pyrrolidone ◽  
Pmma Matrix ◽  
Transmission Electron ◽  
Poly Vinyl Pyrrolidone ◽  
Size Controlled ◽  
Controllable Size

In this work, monodispersed silver nanoparticles with controllable size have been successfully in situ synthesized in PMMA matrix. NaHS, HCl and poly (vinyl pyrrolidone) (PVP) were used to optimize the nucleation and growth of silver nanocrystalline. UV–vis analysis and transmission electron microscopy (TEM) were used to characterize the size and dispersion of silver nanoparticles in the Ag/PMMA nanocomposites. The results show that silver nanoparticles homogeneously distribute in PMMA/DMF sol and the particle size of silver nanoparticles increase with the increasing of time. The nucleation of Ag atoms can be facilitated through the addition of a trace amount of NaHS to generate Ag2S clusters as heterogeneous nuclei. Introducing a trace amount of Cl- into the reaction system can effectively reduce the growth rate of the nanoparticles and thus generating more uniform silver nanoparticles in PMMA matrix.

scholarly journals Polyaniline Modified with Cobalt-Hexacyanoferrate (PmCH) as an Adsorbent for Removal of Heavy Metals from Aqueous Solutions

2018 ◽  
Vol 51 ◽  
pp. 03004
Author(s):  
Nima Moazezi ◽  
Mohammad Ali Moosavian
Keyword(s):  
Heavy Metals ◽  
Ionic Strength ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Contact Time ◽  
Ion Concentration ◽  
Adsorption Capacities ◽  
Cobalt Hexacyanoferrate ◽  
Optimum Ph ◽  
Removal Of Heavy Metals

In this study, polyaniline modified with cobalt-hexacyanoferrate (PmCH) composite was synthesized and characterized for removal of Rb+, Cd2+, Zn2+, Pb2+, and Ni2+ by FTIR and XRD. The effect of pH, adsorbent dosage, ionic strength, contact time, initial ion concentration, and temperature were studied. The competition adsorption experiments between metal ions were investigated. Batch desorption was also conducted to evaluate the reusability of PmCH. The maximum adsorption capacities were 96.15, 27.17, 17.85, 19.15, and 4.76 mg g-1 of Rb+, Cd2+, Zn2+, Pb2+, and Ni2+, respectively. The optimum pH was determined at natural pH of each solution.

Removal of heavy metals from simulated wastewater by in situ formation of layered double hydroxides

2016 ◽  
Vol 306 ◽  
pp. 1035-1040 ◽  
Author(s):  
Francisco R. Peligro ◽  
Ivana Pavlovic ◽  
Ricardo Rojas ◽  
Cristobalina Barriga
Keyword(s):  
Heavy Metals ◽  
Layered Double Hydroxides ◽  
Removal Of Heavy Metals ◽  
Simulated Wastewater ◽  
In Situ Formation ◽  
Double Hydroxides

scholarly journals Simultaneous removal of heavy metals and biodegradation of organic matter with sediment microbial fuel cells

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53433-53438 ◽  
Author(s):  
M. S. Wu ◽  
X. Xu ◽  
Q. Zhao ◽  
Z. Y. Wang
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Simultaneous Removal ◽  
Removal Of Heavy Metals

To in situ remediate rivers polluted by organic matter and heavy metals, lab-scale sediment microbial fuel cells (SMFCs) were operated under different conditions.

scholarly journals Present and Future Prospect of Algae: A Potential Candidate for Sustainable Pollution Mitigation

2021 ◽  
Vol 15 (1) ◽  
pp. 142-156
Author(s):  
Ashutosh Tripathy ◽  
Ram Dev More ◽  
Sandeep Gupta ◽  
Jastin Samuel ◽  
Joginder Singh ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Particulate Matter ◽  
Wastewater Treatment Plants ◽  
Algal Species ◽  
Mitigation Strategies ◽  
Potential Candidate ◽  
Pollution Mitigation ◽  
Removal Of Heavy Metals ◽  
Simple Growth ◽  
Biological Methods

Pollution control and mitigation are critical to protect the ecosystem and make everyone's life safer and healthier. Different pollution mitigation strategies and measures are implemented to remove pollutants, which broadly involve physical, chemical, and biological methods. Biological methods are found to be more sustainable, effective, and eco-friendlier than the other two methods. These methods mainly use microbes like bacteria, fungi, algae, and plants, and their products like enzymes and metabolic products to remove pollutants. Due to their unique photosynthetic ability and simple growth requirements, Algae can be grown using simpler components like CO2, sunlight, and media, making them a potential candidate to be used as a pollution mitigator. Algae can indicate and remove pollutants like CO2, SO2, NO2, and particulate matter from the air; these pollutants and particulate matter are either used for their growth or these are accumulated inside them.. Algal species have shown the efficient removal of heavy metals, organic pollutants, explosives, petroleum contaminants, pesticides, polycyclic aromatic hydrocarbons (PAHs), and plastics from different water sources. There is a lot of scope in using algae to remove organic and inorganic pollutants in wastewater treatment plants. Algae hold great potential to remove radioactive pollutants from natural resources and involve removal mechanisms like biosorption and bioaccumulation. Algae can be used with different adsorbent materials to develop adsorption systems for the adsorption of radionuclides and heavy metals. This review elucidates different algal species, their cultural conditions, the removal efficiency of different types of pollutants from the air, water, soil, and their role in genetic engineering and the algae's potential for waste mitigation.

scholarly journals Harmful Impacts of Heavy Metals and Utility of Biosorption Technique for Their Removal from Wastewater: A Review

2022 ◽  
Vol 8 (1) ◽  
pp. 1-17
Author(s):  
Ankita Negi ◽  
Rajesh Kumar ◽  
Sushil Kumar Joshi ◽  
Arpita Negi ◽  
Bhuvnesh Kumar ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Metal Ion ◽  
Membrane Filtration ◽  
Literature Survey ◽  
Ion Concentration ◽  
Aquatic Environments ◽  
Chelating Ligands ◽  
Commercial Use ◽  
Removal Of Heavy Metals ◽  
Traditional Approaches

The increasing number of efluents discharged from the source of water (urban, industrial, agricultural etc.), is resulting in a higher concentration of heavy metals in the source. Heavy metals have a density of over 5g/cm3 to the metals. These are toxic, mutagenic, carcinogenic and resistant in watery and non-aquatic environments and impact water and non-water bodies seriously by substituting the basic metals of the same function. The extraction from the wastewater can be done in numerous techniques for example using an ion replacement, membrane filtration, osmosis, etc. This study discusses the adverse effects of heavy metals on the human body, the benefits of biosorption over traditional approaches for removal of heavy metals, the different biosorbents used to extract heavy metals and concerning issues regarding its commercial use, offering a wider viewpoint for the diversity of biosorbents and utilization of biosorption technique. It is evident from the profound literature survey that pH, biosorbent particle size, contact time, initial metal ion concentration, presence of chelating ligands etc. are some factors that affect the rate and extent of biosorption. 

scholarly journals Current Trends in the Application of Nanomaterials for the Removal of Pollutants from Industrial Wastewater Treatment—A Review

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2799
Author(s):  
Geetha Palani ◽  
A. Arputhalatha ◽  
Karthik Kannan ◽  
Sivarama Krishna Lakkaboyana ◽  
Marlia M. Hanafiah ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Heavy Metal Contamination ◽  
Cost Effective ◽  
Innovative Technology ◽  
Potential Candidate ◽  
Innovative Methods ◽  
Current Trends ◽  
Removal Of Heavy Metals ◽  
Pollutants Removal

In the recent decades, development of new and innovative technology resulted in a very high amount of effluents. Industrial wastewaters originating from various industries contribute as a major source of water pollution. The pollutants in the wastewater include organic and inorganic pollutants, heavy metals, and non-disintegrating materials. This pollutant poses a severe threat to the environment. Therefore, novel and innovative methods and technologies need to adapt for their removal. Recent years saw nanomaterials as a potential candidate for pollutants removal. Nowadays, a range of cost-effective nanomaterials are available with unique properties. In this context, nano-absorbents are excellent materials. Heavy metal contamination is widespread in underground and surface waters. Recently, various studies focused on the removal of heavy metals. The presented review article here focused on removal of contaminants originated from industrial wastewater utilizing nanomaterials.

Preparation of Micro/Nanoporous Polyacrylonitrile Nanofibers via In Situ Pore-Forming Method

2014 ◽  
Vol 556-562 ◽  
pp. 60-63 ◽  
Author(s):  
Gui Shan Hong ◽  
Xiong Li ◽  
Yin Yang ◽  
Ling Di Shen ◽  
Min Wang
Keyword(s):  
Surface Area ◽  
Weight Ratio ◽  
High Specific Surface Area ◽  
Hot Water ◽  
Vinyl Pyrrolidone ◽  
Bet Surface Area ◽  
The Novel ◽  
As Adsorption ◽  
Poly Vinyl Pyrrolidone

A novel micro/nanoporous polyacrylonitrile (PAN) nanofiber was prepared by electrospun blend of PAN and poly (vinyl pyrrolidone) (PVP) while removing PVP via in-situ pore-forming method. The morphology of porous PAN nanofibers was observed by FESEM and the results indicated that the nanofibers were porous throughout at the PAN/PVP weight ratio of 1:2.5 and leaching water temperature of 85 oC. The Brunauer-Emmett-Teller (BET) surface area of the micro/nanoporous PAN nanofibrous mat was 183.1 m2/g. The spectra of ATR-FTIR confirmed that PVP has been leached out by hot water mostly. The novel micro/nanoporous PAN nanofibrous mat with high specific surface area is expected to be used in the fields such as adsorption, ultrafiltration, solid carrier of catalysts, and so on.

scholarly journals Preserving the Integrity of Liposomes Prepared by Ethanol Injection upon Freeze-Drying: Insights from Combined Molecular Dynamics Simulations and Experimental Data

Pharmaceutics ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 530 ◽  
Author(s):  
Silvia Franzè ◽  
Francesca Selmin ◽  
Paolo Rocco ◽  
Giuseppe Colombo ◽  
Antonella Casiraghi ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Freeze Drying ◽  
Md Simulations ◽  
Vinyl Pyrrolidone ◽  
Ethanol Injection ◽  
Dppc Bilayer ◽  
Liposome Size ◽  
Poly Vinyl Pyrrolidone ◽  
Dynamics Simulations ◽  
Residual Organic Solvents

The freeze-drying of complex formulations, such as liposomes, is challenging, particularly if dispersions contain residual organic solvents. This work aimed to investigate the effects of possible protectants, namely sucrose, trehalose and/or poly(vinyl pyrrolidone) (PVP), on the main features of the dried product using a 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC)-based liposomal dispersion prepared by ethanol injection and containing ethanol up to 6%, as a model. The interactions among vesicles and protectants were preliminary screened by Molecular Dynamics (MD) simulations, which have been proved useful in rationalizing the selection of protectant(s). The freeze-drying protocol was based on calorimetric results. Overall data suggested a stronger cryo-protectant effect of trehalose, compared with sucrose, due to stronger interactions with the DPPC bilayer and the formation of highly ordered clusters around the lipids. The effect further improved in the presence of PVP. Differently from the other tested protectants, the selected trehalose/PVP combination allows to preserve liposome size, even in the presence of 6% ethanol, as demonstrated by Nanoparticle Tracking Analysis (NTA). Nevertheless, it should be also underlined that cakes blew out at an ethanol concentration higher than 1% v/v, probably due to the poor cohesion within the cake and solvent vapour pressure upon sublimation.

Sign in / Sign up

Export Citation Format

Share Document