The Effect of Cu Concentration on TiO2 Nanotubes for Low Concentration of Pb(II) Removal

2013 ◽  
Vol 756 ◽  
pp. 212-218
Author(s):  
Syazwani Mohd Zaki ◽  
Srimala Sreekantan
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Uv Light ◽  
Heavy Metal Removal ◽  
Alginate Beads ◽  
Human Beings ◽  
Wet Impregnation ◽  
Initial Concentration ◽  
Low Concentration ◽  
High Level

Lead (Pb) has been recognized to be acutely toxic to human beings and studies have shown that young children, infants and pregnant women are particularly at risk to unsafe Pb (II) level. Generally, high level of Pb(II) can be removed by using alginate beads. However, at low level, it is not possible to be removed by alginate. For that reason, low concentration (10 ppm) of Pb(II) removal by photocatalytic activity is explored in this work. Cu loaded TiO₂ nanotube was prepared by wet impregnation with different Cu concentration. The initial concentration of Cu involved were 0.01 M, 0.06 M and 0.1 M. For heavy metal removal, the initial concentration of Pb(II) solution used was 10 ppm. The remnant concentration of Pb(II) solution after irradiated under ultraviolet(UV) light was determined by using Atomic Absorption Spectroscopy (AAS). It was observed that the optimal condition of Cu loaded nanotube was at 0.01 M and it exhibited highest removal of Pb(II) with 50%. However, at high Cu concentration(> 0.06 M), it declined the performance of TiO₂ nanotubes for Pb(II) removal. The removal of Pb(II) obtained at 0.06 M and 0.01M was only 23.3% and 17.1%.

Effective Removal of Mercury Ions in Aqueous Solutions: A Review

2020 ◽  
Vol 16 (3) ◽  
pp. 363-375
Author(s):  
Kang Hua ◽  
Xueliu Xu ◽  
Zhiping Luo ◽  
Dong Fang ◽  
Rui Bao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Biological Treatment ◽  
Metal Removal ◽  
Removal Rate ◽  
Synergistic Effects ◽  
Heavy Metal Removal ◽  
Future Research ◽  
Human Beings ◽  
Fast Removal

Background: Due to its high toxicity and bioaccumulation, the existence of mercury in the environment is always a big threat to human beings. In order to control mercury pollution, scientists have put great efforts in the past decades. Methods: Precipitation, adsorption, membrane separation, biological treatment and ion exchange are reviewed as a remover for mercury removal. For each material type, we not only reported on the removal mechanism, but also discussed the best areas for it. The correlation method and step-to-step focusing method have been used for references. Conclusion: With the exploration and application of research, people have mastered a variety of mature technologies for the treatment of mercury-containing wastewater. Using inexpensive adsorbents is a cost-effective method for treating low concentrations of heavy metal wastewater. Ion exchange with a fast removal rate has been widely used in the field of heavy metal removal from wastewater. The biological treatment method can effectively treat low-concentration mercurycontaining wastewater. However, there is still a need to develop novel mercury removers with high capacity, fast removal rate, and low removal limit. Nanomaterials with a high specific surface area on substrate with synergistic effects, such as high adsorption and ion exchange, are the future research points.

scholarly journals Reactivity and Heavy Metal Removal Capacity of Calcium Alginate Beads Loaded with Ca–Al Layered Double Hydroxides

2019 ◽  
Vol 3 (1) ◽  
pp. 22 ◽  
Author(s):  
Andres Borgiallo ◽  
Ricardo Rojas
Keyword(s):  
Heavy Metal ◽  
Layered Double Hydroxides ◽  
Calcium Alginate ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Alginate Beads ◽  
Buffering Capacity ◽  
Uptake Capacity ◽  
Removal Capacity ◽  
Double Hydroxides

Layered double hydroxides (LDHs) present multiple applications due to their versatility and reactivity. Thus, Ca–Al LDHs with Friedel’s salt structure (HC) have been proposed as heavy metal scavengers due to their buffering capacity at basic pHs. Nevertheless, the control of the reactivity of LDHs such as HC is necessary to optimize their applications. Here, the reactivity of an HC prepared by a coprecipitation method was modified by its inclusion in calcium alginate (CaAlg) beads prepared by ionic gelation. The obtained beads (CaAlg/HC) showed good dispersion of the HC particles in the alginate matrix and were used to test the acid base reactivity and heavy metal uptake capacity compared with pure CaAlg beads and HC powder separately. The pH buffering capacity of CaAlg beads was enriched by the inclusion of HC that, in turn, was modulated in its reactivity. Thus, the HC dissolution times changed from mere seconds for the powder to tens of minutes when enclosed in the beads in a kinetic profile determined by the diffusive step. On the other hand, Cu2+ uptake capacity of CaAlg/HC beads combined the Cu(OH)2 precipitation capacity of HC with the complexation capacity of alginate, reaching good affinity and capacity for the obtained beads. Nevertheless, the precipitation of the hydroxide was produced outside the bead, which would induce the addition of an additional separation step to produce an acceptable Cu2+ elimination.

scholarly journals Removal of Oil and Heavy Metals from Oily Sludge using Esterquat Surfactant via Surfactant-Enhanced Oil Recovery (SEOR)

2019 ◽  
Vol 8 (4) ◽  
pp. 6912-6917
Keyword(s):  
Heavy Metal ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Oily Sludge ◽  
Human Beings ◽  
High Concentration ◽  
Conductivity Method ◽  
Refinery Plant

Oily sludge is one of the most significant solid waste materials generated by petroleum refinery plant. Due to high concentration of petroleum hydrocarbon (PHCs) that is considered as harmful and hazardous waste to human beings and environmental, the initiative was developed to minimize this issue by performing investigation on cationic plant-based esterquat surfactant for oil recovery and heavy metal removal from oily sludge via Surfactant-enhanced Oil Recovery (SEOR). Based on the research finding, oily sludge has significant amount of volatile matters (32.22 wt%) which consists of hazardous PAHs that needs to be removed from oily sludge. Cationic esterquat surfactant has been introduced in removal of heavy metal and oil from oily sludge. Result shows the CMCs of cationic esterquat surfactant obtained was about 125mg/L via conductivity method and spectrophotometric method. The percentage of oil recovery obtained was 74.62% at esterquat concentration of 125 mg/L with significant removal on chromium (Cr) and lead (Pb). This finding shows the potential of cationic esterquat surfactant in enhancing the oil and metal removal from oily sludge.

scholarly journals HEAVY METAL POLLUTANT SORPTION IN AQUATIC ENVIRONMENT BY MICROALGAE CONSORTIUM

2021 ◽  
Vol 5 (1) ◽  
pp. 51
Author(s):  
Astri Rinanti ◽  
Melati Ferianita Fachrul ◽  
Rositayanti Hadisoebroto ◽  
Sinthya Desty ◽  
Rahmadhania Rahmadhania ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Environmental Problem ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Metal Analysis ◽  
Cultivation System ◽  
Biosorption Process ◽  
Secondary Pollutants ◽  
High Level

<span id="docs-internal-guid-d0229f1b-7fff-d768-d24f-5faaaf7907f0"><span>Industrial waste that contains heavy metal can cause environmental problem because of its toxicity, persistency and accumulation level in the environment. Biosorption process is highly influenced by temperature, pH, light, contact time, and ratio of surface area. Microalgae which possess two functional groups that are able to react on metal ion in a solution can be exploited to overcome environmental pollution due to heavy metal compound. Closed cultivation system in a photobioreactor is utilized to overcome contamination and evaporation problems on open pond system. Heavy metal analysis is conducted by utilizing Atomic Absorption Spectroscopy (AAS), Fourier Transform Infra-Red (FTIR), and Scanning Electron Microscope (SEM). This article provides information on biosorption as alternative technology to overcome heavy metal in water areas with no side effects on the environment with advantages of the absence of secondary pollutants, high level of efficiency, and relatively economic compared to physic-chemical method heavy metal removal methods</span></span>

scholarly journals Synthesis, characterization and heavy metal removal efficiency of nickel ferrite nanoparticles (NFN’s)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Waheed Ali Khoso ◽  
Noor Haleem ◽  
Muhammad Anwar Baig ◽  
Yousuf Jamal
Keyword(s):  
Heavy Metals ◽  
Nickel Ferrite ◽  
Contact Time ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Ferrite Nanoparticles ◽  
Batch Adsorption ◽  
Aqueous Environment ◽  
Human Beings ◽  
Nickel Ferrite Nanoparticles

AbstractThe heavy metals, such as Cr(VI), Pb(II) and Cd(II), in aqueous solutions are toxic even at trace levels and have caused adverse health impacts on human beings. Hence the removal of these heavy metals from the aqueous environment is important to protect biodiversity, hydrosphere ecosystems, and human beings. In this study, magnetic Nickel-Ferrite Nanoparticles (NFNs) were synthesized by co-precipitation method and characterized using X-Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Field Emission Scanning Electronic Microscopy (FE-SEM) techniques in order to confirm the crystalline structure, composition and morphology of the NFN’s, these were then used as adsorbent for the removal of Cr(VI), Pb(II) and Cd(II) from wastewater. The adsorption parameters under study were pH, dose and contact time. The values for optimum removal through batch-adsorption were investigated at different parameters (pH 3–7, dose: 10, 20, 30, 40 and 50 mg and contact time: 30, 60, 90, and 120 min). Removal efficiencies of Cr(VI), Pb(II) and Cd(II) were obtained 89%, 79% and 87% respectively under optimal conditions. It was found that the kinetics followed the pseudo second order model for the removal of heavy metals using Nickel ferrite nanoparticles.

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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