Biosorption for removal of hexavalent chromium using microalgae Scenedesmus sp.

Pradhan, Debabrata; Sukla, Lala Behari; Mishra, Bibhuti Bhusan

doi:10.1016/j.jclepro.2018.10.288

Cited by 240 publications

(60 citation statements)

References 40 publications

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“…Experimental data were examined using kinetic models to investigate sorption mechanism and rate controlling step 52 . Moreover, kinetics of the sorption study is required for the determination of sorption velocity 53 .…”

Section: Resultsmentioning

confidence: 99%

“…This isotherm is an experimental equation and commonly manipulates to characterize multi-layer sorption on heterogeneous surface 60 . The value of 1/n of the Freundlich isotherm identifies the practicability of isotherms like favorable, unfavorable or irreversible if its value is 0 < 1/n < 1, 1/n > 1 or 1/n = 0 respectively 52 . In the current study, value of 1/n was found less than one which implies the favorable nature of the removal of halosulfuron methyl.…”

Section: Resultsmentioning

confidence: 99%

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Mechanisms of halosulfuron methyl pesticide biosorption onto neem seeds powder

Saeed

Usman

Zahoor

et al. 2021

Sci Rep

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The current investigation was designed to remove halosulfuron methyl from aqueous media by means of neem seed powder (NSP) in batch modes. Characterizations of NSP were carried out by using EDX, SEM, FTIR, point of zero charge and surface analysis. Optimum operation conditions were scrutinized by studying the influence of different factors like solution pH, dose of NSP, contact time, initial halosulfuron methyl concentration and temperature. Result indicates the dependency of the removal of halosulfuron methyl on solution pH and maximal removal (54%) was achieved in acidic medium (i.e. pH 3.0). To identify the chemical surface of NSP, point of zero charge of NSP was determined and was found to be 6.5 which imply that the surface of NSP is positively charged below pH 6.6 and favored the anionic sorption. Kinetics of halosulfuron methyl were demonstrated well by pseudo second order due to highest R2 (0.99) owing to the nearness between experimental and calculated sorption capacities. Isotherm results imply that Langmuir was found to the principal model to explain the removal of halosulfuron methyl and maximum monolayer sorption capacity was determined to be 200 mg g−1. Thermodynamic parameters like ΔH°, ΔG° and ΔS° were calculated from van’t Hoff plot and were found negative which suggest that removal of halosulfuron methyl is exothermic and spontaneous at low temperature. These outcomes insinuate that neem seed power may be a valuable, inexpensive and ecofriendly biosorbent for the removal of pesticides.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Mechanisms of halosulfuron methyl pesticide biosorption onto neem seeds powder

Saeed

Usman

Zahoor

et al. 2021

Sci Rep

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“…This activity was suggested to involve both a biological route, through the putative enzyme chromium reductase, and a nonbiological route: Using the scavenger molecule glutathione (GSH). With respect to chromium removal, several strains of microalgae have been reported to be capable of achieving Cr(IV) removal from water bodies, including Scenedesmus and Chlorella species [112,113,114]. In the aforementioned transcriptome study on the green algae Tetraselmis suecica , a transcript for a putative nitrilase was reported [68].…”

Section: Enzymes From Microalgaementioning

confidence: 99%

Microalgal Enzymes with Biotechnological Applications

et al. 2019

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Enzymes are essential components of biological reactions and play important roles in the scaling and optimization of many industrial processes. Due to the growing commercial demand for new and more efficient enzymes to help further optimize these processes, many studies are now focusing their attention on more renewable and environmentally sustainable sources for the production of these enzymes. Microalgae are very promising from this perspective since they can be cultivated in photobioreactors, allowing the production of high biomass levels in a cost-efficient manner. This is reflected in the increased number of publications in this area, especially in the use of microalgae as a source of novel enzymes. In particular, various microalgal enzymes with different industrial applications (e.g., lipids and biofuel production, healthcare, and bioremediation) have been studied to date, and the modification of enzymatic sequences involved in lipid and carotenoid production has resulted in promising results. However, the entire biosynthetic pathways/systems leading to synthesis of potentially important bioactive compounds have in many cases yet to be fully characterized (e.g., for the synthesis of polyketides). Nonetheless, with recent advances in microalgal genomics and transcriptomic approaches, it is becoming easier to identify sequences encoding targeted enzymes, increasing the likelihood of the identification, heterologous expression, and characterization of these enzymes of interest. This review provides an overview of the state of the art in marine and freshwater microalgal enzymes with potential biotechnological applications and provides future perspectives for this field.

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“…However, the spent-medium leaching has recovered gold more efficiently than the two-step bioleaching process. The spentmedium has the significant advantage of continuous or fed-batch culture of microbes resulting in the maximum cyanide production [51][52][53][54].…”

Section: Principle Of Extraction Mechanism Of Goldmentioning

confidence: 99%

Extraction of gold from electronic scraps: a biohydrometallurgical process overview

2019

Biointerface Res Appl Chem

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The explosive growth in the electronics industries has revolutionized modern human life. This has resulted in the enhanced electronic wastes (E-wastes) generation which affects adversely on the global environment. The E-wastes are the end life electronics devices like computers, televisions, VCRs, stereos, copiers, mobile phones, and fax machines, generally discarded without following the standard procedure established by the environmental protection agencies of different countries. They are assembled of different materials which compose various toxic metals and organic compounds; therefore, there is the risk of environmental leaching problems when discarded as such without precaution. There are different policies and steps established for the E-wastes management and the recovery of valuable metals from them is one of the suitable steps. They contain different valuable metals like copper, silver, gold, palladium, rhodium and harmful substances like beryllium, cadmium, mercury, and lead. Gold is a precious metal, which can be recovered by applying conventional techniques such as pyro- and hydro- metallurgy. However, environmental risks are always associated with the above techniques. Bio-hydrometallurgy technique has potential to overcome the issues related to the conventional techniques. Different microorganisms help directly or indirectly in the dissolution reactions of gold from the E-wastes. Acidophilus microorganisms, such as Chromobacterium violaceum, Acidithiobacillus thiooxidans, Acidithiobacillus ferrooxidans, Aspergillus niger, Penicillium simplicissimum and many more, have proved their gold dissolution properties. However it is a slow process compared to that in the conventional techniques, which should be addressed comprehensively.

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Biosorption for removal of hexavalent chromium using microalgae Scenedesmus sp.

Cited by 240 publications

References 40 publications

Mechanisms of halosulfuron methyl pesticide biosorption onto neem seeds powder

Mechanisms of halosulfuron methyl pesticide biosorption onto neem seeds powder

Microalgal Enzymes with Biotechnological Applications

Extraction of gold from electronic scraps: a biohydrometallurgical process overview

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