Effect of acidic and basic pretreatment of wild algal biomass on Cr (VI) biosorption

Singh, Shailendra Kumar; Dixit, Kritika; Sundaram, Shanthy

doi:10.9790/2402-08543841

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…Moreover, it was clear that C. red decreased as concentration increased. This result was similar to those recorded in previous studies, in which pollutant removal decreased by increasing their concentrations [ 31 , 32 , 33 ]. In contrast, M. blue was nearly constant for both membrane types, i.e., AF-U and AF-S, which indicates the high efficiency of these membranes for removal of higher concentrations of M. blue dye.…”

Section: Resultssupporting

confidence: 92%

Removal of Methylene Blue and Congo Red Using Adsorptive Membrane Impregnated with Dried Ulva fasciata and Sargassum dentifolium

Labena

Abdelhamid

Amin

et al. 2021

Plants

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Biosorption is a bioremediation approach for the removal of harmful dyes from industrial effluents using biological materials. This study investigated Methylene blue (M. blue) and Congo red (C. red) biosorption from model aqueous solutions by two marine macro-algae, Ulva fasciata and Sargassum dentifolium, incorporated within acrylic fiber waste to form composite membranes, Acrylic fiber-U. fasciata (AF-U) and Acrylic fiber-S. dentifolium (AF-S), respectively. The adsorption process was designed to more easily achieve the 3R process, i.e., removal, recovery, and reuse. The process of optimization was implemented through one factor at a time (OFAT) experiments, followed by a factorial design experiment to achieve the highest dye removal efficiency. Furthermore, isotherm and kinetics studies were undertaken to determine the reaction nature. FT-IR and SEM analyses were performed to investigate the properties of the membrane. The AF-U membrane showed a significant dye removal efficiency, of 88.9% for 100 ppm M. blue conc. and 79.6% for 50 ppm C. red conc. after 240 min sorption time. AF-S recorded a sorption capacity of 82.1% for 100 ppm M. blue conc. after 30 min sorption time and 85% for 100 ppm C. red conc. after 240 min contact time. The membranes were successfully applied in the 3Rs process, in which it was found that the membranes could be used for five cycles of the removal process with stable efficiency.

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Section: Resultssupporting

confidence: 92%

Removal of Methylene Blue and Congo Red Using Adsorptive Membrane Impregnated with Dried Ulva fasciata and Sargassum dentifolium

Labena

Abdelhamid

Amin

et al. 2021

Plants

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“…Therefore, many conventional methods were used for chromium removal: ion exchange, electrodialysis, ultrafiltration, chemical precipitation and reverse osmosis (Nataraj et al 2007;Rajput et al 2016;An et al 2017;Yan et al 2017;Zamri et al 2017). However, these technologies are very expensive, generate toxic non-ecofriendly waste material and are not effective at a low chromium concentration (Singh et al 2014). Alternatively, many researchers were directed to use several non-conventional methods such as biosorption for better and safe removal.…”

Section: Introductionmentioning

confidence: 99%

Absorption of hexavalent chromium by green micro algae Chlorella sorokiniana: live planktonic cells

Husien

Labena

El‐Belely

et al. 2019

Water Practice and Technology

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Hexavalent chromium Cr (VI) is a toxic heavy metal that discharged by many industries into the water streams. It is the most toxic form of chromium compound, which causes significant damage to receiving ecosystems. A microalgal species, Chlorella sp., was used as a biosorbent material to remove Cr (VI) from Cr-contaminated effluents. Furthermore, different variables: pH, temperature, contact time, Cr (VI) concentration and algal dose, were optimized in order to determine the optimum conditions that achieve the highest removal efficiency. The optimization process was achieved through two steps: one factor at a time (OFAT) experiments followed by 25 general full factorial. Moreover, molecular identification was performed using 18S rRNA in order to demonstrate the species of Chlorella, and it was identified as Chlorella sorokiniana. The highest chromium removal efficiency of 99.6793% was achieved at 100 ppm Cr (VI) after three days' contact time. Chlorophyll ‘a’ estimation as a growth indicator stated that Chlorella sorokiniana can tolerate 100 ppm Cr (VI) for three days' exposure. The results suggested that Chlorella sorokiniana is a good biosorbent material and it distinguished by its high ability to uptake Cr (VI) from solutions.

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“…In comparison, for chromium removal by acid and alkali pre-treated algal cells, Singh et al (2014) have observed that all of the pre-treated samples showed similar trends of removal. A rapid chromium biosorption took place in the first 30 min, showing a rapid removal of 65% at 15 min.…”

Section: Resultsmentioning

confidence: 89%

“…The oxygen-containing (-COOH, -OH) and (-NH 2 ) were the main functional groups related metal biosorption in Bacillus species (Liu et al 2019). Metal sorption capacity of biosorbent can be altered by pre-treatment, which could modify the surface characteristics either by removing or masking the groups or by exposing more metal-binding sites (Singh et al 2014). The acid or alkali treatment contributes to removing some leachable materials (organic compounds, carbonatebased materials) that could influence acid-base properties (Oliveira et al 2011).…”

Section: Resultsmentioning

confidence: 99%

Biosorption of lanthanum and samarium by chemically modified free Bacillus subtilis cells

Giese

Jordão

2019

Appl Water Sci

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Previous studies showed that Bacillus subtilis possessed high physiological activity in industrial waste treatment as a biosorbent for recovery metals, and in this study, the sorption capacity for both La 3+ and Sm 3+ was demonstrated. The effects of lanthanide concentration and contact time were tested to acid and alkali pre-treated cells. Very high levels of removal, reaching up to 99% were obtained for both lanthanide ions. Langmuir isotherm model was applied to describe the adsorption isotherm and indicated a better correlation with experimental data R 2 = 0.84 for La 3+ using sodium hydroxide pre-treated free cells and R 2 = 0.73 for Sm 3+ to acid pre-treated B. subtilis cells as biosorbents. Results of this study indicated that chemically modified B. subtilis cells are a very good candidate for the removal of light rare-earth elements from aquatic environments. The process is feasible, reliable, and eco-friendly.

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Effect of acidic and basic pretreatment of wild algal biomass on Cr (VI) biosorption

Cited by 7 publications

References 8 publications

Removal of Methylene Blue and Congo Red Using Adsorptive Membrane Impregnated with Dried Ulva fasciata and Sargassum dentifolium

Removal of Methylene Blue and Congo Red Using Adsorptive Membrane Impregnated with Dried Ulva fasciata and Sargassum dentifolium

Absorption of hexavalent chromium by green micro algae Chlorella sorokiniana: live planktonic cells

Biosorption of lanthanum and samarium by chemically modified free Bacillus subtilis cells

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