scholarly journals Elaboration of Lamellar and Nanostructured Materials Based on Manganese: Efficient Adsorbents for Removing Heavy Metals

2020 ◽  
Vol 67 (4) ◽  
pp. 1180-1195
Author(s):  
Amina Amarray ◽  
Sanae El Ghachtouli ◽  
Mohammed Ait Himi ◽  
Mohamed Aqil ◽  
Khaoula Khaless ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Manganese Oxide ◽  
Toxic Metals ◽  
Manganese Oxides ◽  
Mesoporous Structure ◽  
Oxide Material ◽  
Oxide Materials ◽  
Mineral Structure ◽  
Removal Of Heavy Metals ◽  
Synthesized Materials

The lamellar and nanostructured manganese oxide materials were chemically synthesized by soft and non-toxic methods. The materials showed a monophasic character, symptomatic morphologies, as well as the predominance of a mesoporous structure. The removal of heavy metals Cd(II) and Pb(II) by the synthesized materials Na-MnO2, Urchin-MnO2 and Cocoon-MnO2 according to the mineral structure and nature of the sites were also studied. Kinetically, the lamellar manganese oxide material Na-MnO2 was the most efficient of the three materials which had more vacancies in the MnO6 layers as well as in the space between the layers. The nanomaterials Urchin-MnO2 and Cocoon-MnO2 could exchange with the metal cations in their tunnels and cavities, respectively. The maximum adsorbed quantities followed the order (Pb(II): Na-MnO2 (297 mg/g)>Urchin-MnO2 (264 mg/g)>Cocoon-MnO2 (209 mg/g), Cd(II): Na-MnO2 (199 mg/g)>Urchin-MnO2 (191 mg/g)>Cocoon-MnO2 (172 mg/g)). Na-MnO2 material exhibited the best stability among the different structures, Na-MnO2 presented a very low amount of the manganese released. The results obtained showed the potential of lamellar manganese oxides (Na-MnO2) and nanostructures (Urchin-MnO2 and Cocoon-MnO2) as selective, economical, and stable materials for the removal of toxic metals in an aqueous medium.

Study of the Cu(II) removal from aqueous solutions by adsorption on titania

2013 ◽  
Vol 12 (3) ◽  
pp. 239-247
Keyword(s):  
Heavy Metals ◽  
Ionic Strength ◽  
Toxic Metals ◽  
Low Cost ◽  
Lateral Interaction ◽  
Tio2 Surface ◽  
High Toxicity ◽  
Removal Of Heavy Metals ◽  
Solution Parameters ◽  
Kinetics Of

The removal of heavy metals from wastewaters is a matter of paramount importance due to the fact that their high toxicity causes major environmental pollution problems. One of the most efficient, applicable and low cost methods for the removal of toxic metals from aqueous solutions is that of their adsorption on an inorganic adsorbent. In order to achieve high efficiency, it is important to understand the influence of the solution parameters on the extent of the adsorption, as well as the kinetics of the adsorption. In the present work, the adsorption of Cu(II) species onto TiO2 surface was studied. It was found that the adsorption is a rapid process and it is not affected by the value of ionic strength. In addition, it was found that by increasing the pH, the adsorbed amount of Cu2+ ions and the value of the adsorption constant increase, whereas the value of the lateral interaction energy decreases.

scholarly journals Response of Pseudokirchneriella subcapitata in Free and Alginate Immobilized Cells to Heavy Metals Toxicity

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2847
Author(s):  
Zaki M. Al-Hasawi ◽  
Mohammad I. Abdel-Hamid ◽  
Adel W. Almutairi ◽  
Hussein E. Touliabah
Keyword(s):  
Heavy Metals ◽  
Toxic Metals ◽  
Immobilized Cells ◽  
Algal Growth ◽  
Pseudokirchneriella Subcapitata ◽  
Response Curves ◽  
Free Cells ◽  
Heavy Metals Toxicity ◽  
Removal Of Heavy Metals ◽  
Immobilized Algae

Effects of 12 heavy metals on growth of free and alginate-immobilized cells of the alga Pseudokirchneriella subcapitata were investigated. The tested metals ions include Al, As, Cd, Co, Cr, Cu, Hg, Se, Ni, Pb, Sr, and Zn. Toxicity values (EC50) were calculated by graphical interpolation from dose-response curves. The highest to the lowest toxic metals are in the order Cd > Co > Hg > Cu > Ni > Zn > Cr > Al > Se > As > Pb > Sr. The lowest metal concentration (mg L−1) inhibiting 50% (EC50) of algal growth of free and immobilized (values in parentheses) algal cells were, 0.018 (0.09) for Cd, 0.03 (0.06) for Co, 0.039 (0.06) for Hg, 0.048 (0.050) for Cu, 0.055 (0.3) for Ni, 0.08 (0.1) for Zn, 0.2 (0.3) for Cr, 0.75 (1.8) for Al, 1.2 (1.4) for Se, 3.0 (4.0) for As, 3.3 (5.0) for Pb, and 160 (180) for Sr. Free and immobilized cultures showed similar responses to Cu and Se. The free cells were more sensitive than the immobilized ones. Accordingly, the toxicity (EC50) of heavy metals derived only form immobilized algal cells might by questionable. The study suggests that batteries of alginate-immobilized algae can efficiently replace free algae for the bio-removal of heavy metals.

The structure–property relationship of manganese oxides: highly efficient removal of methyl orange from aqueous solution

2015 ◽  
Vol 3 (37) ◽  
pp. 19000-19010 ◽  
Author(s):  
Yan Liu ◽  
Jie Wei ◽  
Yaxi Tian ◽  
Shiqiang Yan
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Manganese Oxide ◽  
Adsorption Capacity ◽  
Manganese Oxides ◽  
Oxide Materials ◽  
Structure Property ◽  
Efficient Removal ◽  
Structure Property Relationship ◽  
Relationship Of

A-MnO2 has the best adsorption capacity for methyl orange among other manganese oxide materials.

Retention and distribution of Cu, Pb, Cr, and Zn in a full-scale hybrid constructed wetland receiving municipal sewage

2013 ◽  
Vol 67 (10) ◽  
pp. 2257-2264
Author(s):  
Haiwen Xiao ◽  
Shengli Zhang ◽  
Jun Zhai ◽  
Qiang He ◽  
Adriaan Mels ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Manganese Oxides ◽  
Free Water ◽  
Municipal Sewage ◽  
Plant Tissues ◽  
Water Stream ◽  
Wastewater Treatment Process ◽  
Metal Concentrations ◽  
Removal Of Heavy Metals

This study was conducted to investigate the retention and distribution of Cu, Pb, Cr, and Zn in a hybrid constructed wetland (CW) that consists of both vertical baffled flow wetlands (VBFWs) and horizontal subsurface flow wetlands (HSSFs) with unique flow regimes and oxygen distribution. The heavy metal concentrations in water, sediments, and plant tissues in the hybrid CW were analysed. The removal of heavy metals from the water stream in the monitoring period was not statistically significant. Metal concentrations in the sediments generally decreased along the wastewater treatment process. The reductive anaerobic condition in the VBFW may promote the sulphate reduction and form highly insoluble Cu, Pb, and Zn sulphides, resulting in the higher concentration of the bivalent cations in the VBFW sediments than the corresponding values in the HSSF; however, the aerobic and anoxic environments in the HSSF enhanced the removal of Cr with the co-precipitation of iron and manganese oxides, and their hydroxides. Metal concentrations in plant tissues were not significantly influenced by the concentrations in sediments, while roots contained statistically higher metal concentrations than stems and leaves. The sediments stored 94.01, 86.31, 95.85, and 89.51% of the total Cu, Pb, Cr, and Zn retained in the hybrid CW system, respectively, while only small fractions (<10%) were accumulated in the harvestable macrophyte tissues. It is important to clean not only the accessible sediments in free water surface tank and ponds but also the embedded sediments in vegetated beds for the sustainable removal of heavy metals.

Environmental Amelioration Using Aquatic Macrophytes: Emphasizing Removal of Heavy Metals from Waste Water

2016 ◽  
Vol 5 (6) ◽  
pp. 244-250
Author(s):  
Anindita Mitra ◽  
Soumya Chatterjee
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Heavy Metal ◽  
Toxic Metals ◽  
Aquatic Macrophytes ◽  
Polluted Water ◽  
Pollution Level ◽  
Primary Role ◽  
Aquatic Life ◽  
Removal Of Heavy Metals

Pollution of the aquatic environment with toxic metals has been attracting considerable attention over the past decades and increasing urbanization, industrialization and overpopulation are the main cause. Due to this toxic pollutant the global water crisis is one of the most serious problems facing by the humanity today as also plants and animals are very sensitive to the presence of these toxic metals. Phytoextraction is the most cost effective and environment friendly way to solve the problem of heavy metal pollution by using plants. Macrophytes are important component of aquatic communities due to their roles in oxygen production, nutrient cycling, water quality control, sediment stabilization to provide habitat and shelter for aquatic life and also for being considered efficient heavy metal accumulators. The main route of heavy metal uptake is through their roots in emergent and surface floating plants whereas, leafy submerged plants uptake heavy metals both through roots and leaves. Roots of wetland plants play the primary role in wastewater purification followed by stems and leaves. Aquatic macrophytes therefore are very useful for the treatment of wastewater to mitigate variety of pollution level and now are the important research issues all over the world. In this review an effort has been made to summarize the role of aquatic macrophytes in the removal of heavy metals from the polluted water to improve the water quality.

Engineering β-ketoenol structure functionality in hybrid silica as excellent adsorbent material for removal of heavy metals from water

2018 ◽  
Vol 42 (16) ◽  
pp. 13229-13240 ◽  
Author(s):  
Said Tighadouini ◽  
Smaail Radi ◽  
Mohamed Anannaz ◽  
Maryse Bacquet ◽  
Stéphanie Degoutin ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Chemical Modification ◽  
Toxic Metals ◽  
Hybrid Silica ◽  
Removal Of Heavy Metals ◽  
Chelating Adsorbent

A chelating adsorbent based on the chemical modification of silica by an efficient host able to capture toxic metals, is presented.

scholarly journals Role of Bioadsorbents in Reducing Toxic Metals

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Blessy Baby Mathew ◽  
Monisha Jaishankar ◽  
Vinai George Biju ◽  
Krishnamurthy Nideghatta Beeregowda
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Toxic Metals ◽  
Metal Ion ◽  
Lead And Cadmium ◽  
Oil Palm Shell ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Near Future

Industrialization and urbanization have led to the release of increasing amounts of heavy metals into the environment. Metal ion contamination of drinking water and waste water is a serious ongoing problem especially with high toxic metals such as lead and cadmium and less toxic metals such as copper and zinc. Several biological materials have attracted many researchers and scientists as they offer both cheap and effective removal of heavy metals from waste water. Therefore it is urgent to study and explore all possible sources of agrobased inexpensive adsorbents for their feasibility in the removal of heavy metals. The objective was to study inexpensive adsorbents like various agricultural wastes such as sugarcane bagasse, rice husk, oil palm shell, coconut shell, and coconut husk in eliminating heavy metals from waste water and their utilization possibilities based on our research and literature survey. It also shows the significance of developing and evaluating new potential biosorbents in the near future with higher adsorption capacity and greater reusable options.

scholarly journals Nickel Coated Carbon Nanomaterial for the Removal of Heavy and Toxic Metals (Cd, Cu) from Water and Wastewater

2018 ◽  
Vol 778 ◽  
pp. 79-85 ◽  
Author(s):  
Tayyaba Asim ◽  
Riaz Ahmad ◽  
MUHAMMAD Shahid Ansari
Keyword(s):  
Heavy Metals ◽  
Toxic Metals ◽  
Membrane Filtration ◽  
Activated Carbons ◽  
Acidic Solutions ◽  
Supported Nanoparticles ◽  
Removal Of Heavy Metals ◽  
Nanocarbon Materials ◽  
Water And Wastewater ◽  
Coated Carbon

Heavy metals in water have always remained a point of concern for the environmental scientists due to their non biodegradability and toxicity. Adsorption and membrane filtration are the most widely studied and applied processes for the treatment of water. Activated carbons have frequently been used for the removal of heavy metals from water by the process of adsorption. With the development of nanotechnology, nanomaterials are used as the adsorbents in water treatment and have proved effective for the removal of heavy and toxic metals from water. nanocarbon materials, nanometal particles and polymer supported nanoparticles are widely used. A new adsorbent comprising of graphite coated with nanonickel particles was prepared, characterized and used for the removal of heavy and toxic metals from water. nanomaterial was characterized using ICP-AES, FTIR, XRD, and SEM. It was used for the removal of cadmium and copper from water. Kinetics and thermodynamics of adsorption of cadmium and copper on both the materials was investigated and compared. Adsorption isotherm of Langmuir, Freundlich and Dubinin-Radushkevich were also applied to the adsorption data for the adsorption and removal of cadmium and copper. Effect of pH was also studied and it was found that nanomaterial was very effective for the removal of Cd and Cu from acidic solutions. Effect of different acids at different concentration was studied and it was found that nanomaterial remained stable for adsorption while carbon alone deteriorated. Results indicate that developed nanomaterial is a very effective adsorbent for the removal of heavy and toxic metals from water and wastewater.

Application of Calophyllum Inophyllum Seed Husk as a Low-cost Biosorbent for Efficient Removal of Heavy Metals from Wastewater for a Safer Environment

2019 ◽  
Vol 6 (2) ◽  
pp. 159-172
Author(s):  
Adeniyi A. Adenuga ◽  
John Adekunle O. Oyekunle ◽  
Olufemi D. Amos
Keyword(s):  
Heavy Metals ◽  
Toxic Metals ◽  
Low Cost ◽  
Simultaneous Removal ◽  
Potentially Toxic Metals ◽  
Calophyllum Inophyllum ◽  
Adsorption Capacities ◽  
Removal Of Heavy Metals ◽  
Seed Husk ◽  
Wastewater Samples

Background: Effective treatment of wastewaters for potentially toxic metals especially at affordable cost is critical to the well-being of man and the environment. Objective: This study optimized the conditions for the application of Calophyllum inophyllum seed husk as biosorbent for simultaneous removal of heavy metals from aqueous solutions and investigated the removal efficiencies of the biosorbent for Pb2+ and Cd2+ in wastewater samples. Methods: The dependence of the adsorption process on pH, adsorbent dosage, temperature, initial metal ions concentration, and contact time was evaluated in a batch system by determining the degree of adsorption of Pb2+ and Cd2+ in simulated industrial wastewater before application of the biosorbent for metals cleanup in industrial and domestic wastewater samples. Results: The results showed that charring and microwave irradiation of the biosorbent produced the best performance. The pH of the aqueous solution played a crucial role in the performance of the biosorbent. Optimum adsorption for both metals occurred within the first 60 minutes of the process at pH value around 9. Kinetic studies of the process gave good correlation coefficients for a pseudo-second order kinetic model with adsorption data that fitted well into the Freundlich and Langmuir models but with Freundlich isotherm displaying better fitness. The adsorption capacities of the biosorbent were 42.19 and 22.47 mg/g for Pb2+ and Cd2+, respectively. Conclusion: The study concluded that the good adsorption capacities of Calophyllum inophyllum seed husk for the metals is an indications of its considerable potential as a low-cost biosorbent for simultaneous removal of potentially toxic metals from wastewaters.

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