scholarly journals Heavy metal removal from aqueous systems using hydroxyapatite nanocrystals derived from clam shells

RSC Advances ◽  
2019 ◽  
Vol 9 (40) ◽  
pp. 22883-22890 ◽  
Author(s):  
Dariela Núñez ◽  
Jon Ander Serrano ◽  
Aritz Mancisidor ◽  
Elizabeth Elgueta ◽  
Kokkarachedu Varaprasad ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Column Experiments ◽  
Aqueous Systems ◽  
Hydroxyapatite Nanocrystals ◽  
P Removal

Removal of Pb(ii), Cu(ii) and Cd(ii) was attained using hydroxyapatite nanocrystals derived from clam shells, in batch and column experiments.

scholarly journals Remediation of Cr(VI)/Cd(ІІ)-Contaminated Groundwater with Simulated Permeable Reaction Barriers Filled with Composite of Sodium Dodecyl Benzene Sulfonate-Modified Maifanite and Anhydride-Modified Fe@SiO2@Polyethyleneimine: Environmental Factors and Effectiveness

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Jingqing Gao ◽  
Yalin Zhai ◽  
Zhenzhen Huang ◽  
Peng Ren ◽  
Jianlei Gao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Composite Material ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Contaminated Groundwater ◽  
Column Experiments ◽  
Benzene Sulfonate ◽  
Dodecyl Benzene Sulfonate

A composite material of sodium dodecyl benzene sulfonate- (SDBS-) modified maifanite and anhydride-modified Fe@SiO2@PEI (PEI) was used as an adsorbent for the removal of hexavalent chromium (Cr(VI)) and bivalent cadmium (Cd(II)) from groundwater by using column experiments and simulated PRB test. In this study, the optimum proportion of SDBS-modified maifanite and anhydride-modified Fe@SiO2@PEI was 5 : 1. In the column experiments, it was found that the penetration time increased with the increase of the initial concentrations (30, 60, and 90 mg/L) and the decrease of the flow rates (5.45, 10.9, and 16.35 mL/min) at an influent pH of 6.5 ± 0.3 . It was also obtained that the removal rates of Cr(VI) and Cd(ІІ) reached 99.93% and 99.79% at an initial Cr(VI) and Cd(ІІ) concentration of 30 mg/L with the flow rate of 10.9 mL/min, respectively, at 6 h. Furthermore, excellent removal effectiveness of Cr(VI) and Cd(ІІ) (85.94% and 83.45%, respectively) was still achieved in simulated PRB test at a flow rate of 5.45 mL/min with the heavy metal solution concentration of 5.0 ± 0.5  mg/L (Cr(VI) and Cd(II) concentration were, respectively, 5.0 ± 0 . 5 mg/L); and the adsorbent had not completely failed by the end of the trial. Yoon-Nelson model was successfully applied to predict the breakthrough curves for the assessment of composite material heavy metal removal performance and was in good agreement with the experimental data of the heavy metal removal efficiency. The strong removal ability of the adsorbent could be attributed to the fact that maifanite with a large diameter can provide support and increase the permeability coefficient and porosity and that zero-valent iron (ZVI) can convert Cr(VI) to Cr(III) and improve the adsorption capacity of maifanite. The obtained results suggested that the novel PRB fillers have great significance for preventing and controlling Cr(VI)/Cd(ІІ)-contaminated groundwater.

scholarly journals Phycoremediation of Wastewater: Heavy Metal and Nutrient Removal Processes

2014 ◽  
Vol 25 (4) ◽  
pp. 51-54
Author(s):  
Anna Kwarciak-Kozłowska ◽  
Lucyna Sławik-Dembiczak ◽  
Bartłomiej Bańka
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Chlorella Vulgaris ◽  
Municipal Wastewater ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Metals Removal ◽  
Iron Manganese ◽  
Influent Wastewater ◽  
P Removal

Abstract Phycoremediation is the use of algae for the removal or biotrans-formation of pollutants from wastewater. The study is a novel at-tempt to integrate nutrient (N and P) removal and some heavy met-als (iron, manganese and zinc) bioaccumulation from municipal wastewater using two microalgae species: Chlorella vulgaris and Scenedesmus armatus. The Chlorella vulgaris showed higher re-moval of total nitrogen (TN) both in influent and effluent waste water than Scenedesmus armatus. Nevertheless, more than 51% of total phosphorus (TP) in effluent and 36% in influent wastewaters were removed by Scenedesmus armatus. More efficient microalga in heavy metal removal in influent wastewater was Scenedesmus armatus. The results showed that Chlorella vulgaris was appropriate for TN removal and bioaccumulation of heavy metals from effluent wastewater. Nevertheless, Scenedesmus armatus was highly pref-erable for heavy metals removal from influent wastewater.

Comparative Evaluation of Soluble and Insoluble Xanthate Process for Heavy Metal Removal from Wastewaters

1992 ◽  
Vol 26 (1-2) ◽  
pp. 237-246 ◽  
Author(s):  
V. Tare ◽  
S. Chaudhari ◽  
M. Jawed
Keyword(s):  
Heavy Metal ◽  
Comparative Evaluation ◽  
Corn Starch ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Soluble Starch ◽  
Aqueous Systems ◽  
Cadmium Removal ◽  
Removal Capacity ◽  
Ph Range

Insoluble (ISX) and soluble starch xanthate (SSX) were synthesized in the laboratory from corn starch, and were used for metal [Cd(II), Cu(II) and Cr(VI)] removal from aqueous systems. Results indicate that soluble as well as insoluble xanthate processes are capable of meeting various effluent disposal standards. Metal removal by both the processes is maximum in the pH range 4 to 5. Mechanism of Cu(I I)-xanthate and Cr(VI)-xanthate interaction is also discussed. From overall comparison of the two processes it appears that theinsoluble xanthate process has an edge over the solublexanthate process in terms of metal removal capacity, reliability and ease of operation, particularly for cadmium removal. However, soluble xanthate process appears to be relatively less expensive compared to insoluble xanthate.

Research trends of heavy metal removal from aqueous environments

2021 ◽  
Vol 287 ◽  
pp. 112322
Author(s):  
Morteza Nazaripour ◽  
Mir Amir Mohammad Reshadi ◽  
Seyed Ahmad Mirbagheri ◽  
Mehdi Nazaripour ◽  
Alireza Bazargan
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Research Trends ◽  
Aqueous Environments
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