Cycling of iodine by microalgae: Iodine uptake and release by a microalgae biofilm in a groundwater holding pond

Han, Wei; Clarke, William P.; Pratt, Steven

doi:10.1016/j.ecoleng.2016.05.001

Cited by 19 publications

(5 citation statements)

References 40 publications

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“…Log(q e -q t ) = log q e -k 1 t/2.303 (3) t/q t = 1/k 2 q e 2 + t/q e (4) k 1 and k 2 are rate constants for pseudo first order model and pseudo second order model, respectively. The initial adsorption rate, h, was calculated from Eq.…”

Section: Kinetics Of Iodine Adsorptionmentioning

confidence: 99%

“…Radioactive I 131 is used for the treatment of hyperthyroidism, a medical condition of an overactive thyroid, while I 129 is mostly released in the environment form nuclear weapons testing. Different industries participate in iodine discharge in the environment including food, chemical and pharmaceutical industries [3]. Groundwater and surface water can be contaminated by the discharge of iodine -contaminated wastewater [4].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Iodine from Aqueous Solution on Modified Silica Gel with Cyclodextrin Derivatives

Al-Fulaiti¹,

El-Shafey²,

Kindi³

et al. 2022

Pol. J. Environ. Stud.

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The presence of excessive amount of iodine, especially radioactive iodine is dangerous in the environment. The aim of this research is to prepare functionalized silica with cyclodextrin with different hydrophobic cavity sizes to investigate their performance in iodine adsorption. Cyclodextrin (CD) derivatives (αCD, βCD, γCD and hp-βCD) were successfully immobilized on silica gel surface via epichlorohydrin as a cross linker. The ratio of silica (Si) to CD was optimized in preliminary experiments based on the highest uptake of iodine. Selected adsorbents with varied ratios of silica to CD derivatives are investigated, including Si-αCD (3:2), Si-βCD (4:1), Si-γCD (4:1) and Si-hp-βCD (4:1). The adsorption of iodine (I 2 /KI) solution was investigated in terms of initial pH, contact time, iodine concentration and temperature. No significant variations was noticed for iodine adsorption at different pH values, thus, initial pH 6 was selected for further studies. Equilibrium adsorption was reached faster on Si-hp-bCD than other adsorbents with kinetic adsorption data fitting well pseudo second order model. Activation energy (E a ) was found to be in the range of 12.7-23.4 kJ/mol. Equilibrium adsorption data were found to fit well the Langmuir adsorption model with lower uptake as temperature rises. Iodine uptake follows the order: Si-hp-βCD (714 mg/g) >Si-αCD (625 mg/g) >Si-βCD (555.6 mg/g)> Si-γCD (435 mg/g). Thermodynamic study showed that iodine adsorption is exothermic and spontaneous. Adsorbents' reuse exhibited excellent performance for iodine adsorption with a decrease in iodine uptake of ~2-4% in the third adsorption cycle. The study shows that the functionalized silica with hp-bCD shows best performance in terms of kinetics and equilibrium.

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Section: Kinetics Of Iodine Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption of Iodine from Aqueous Solution on Modified Silica Gel with Cyclodextrin Derivatives

Al-Fulaiti¹,

El-Shafey²,

Kindi³

et al. 2022

Pol. J. Environ. Stud.

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“…Bioactive vitamin B 12 (cobalamin) is normally not present in microalgae as it is synthesized as pseudocobalamin in planktonic cyanobacteria [ 37 ]. A series of minerals, including iodine, is also occurring [ 38 ]. Although iodine can occur in higher concentrations, it rarely poses a health problem, acting mainly by interfering with the thyroid gland metabolism resulting in thyrotoxicosis [ 39 , 40 ].…”

Section: Nutritional Composition Of Microalgaementioning

confidence: 99%

Food Ingredients and Nutraceuticals from Microalgae: Main Product Classes and Biotechnological Production

Kratzer

Murkovic

2021

Foods

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Microalgal products are an emerging class of food, feed, and nutraceuticals. They include dewatered or dried biomass, isolated pigments, and extracted fat. The oil, protein, and antioxidant-rich microalgal biomass is used as a feed and food supplement formulated as pastes, powders, tablets, capsules, or flakes designed for daily use. Pigments such as astaxanthin (red), lutein (yellow), chlorophyll (green), or phycocyanin (bright blue) are natural food dyes used as isolated pigments or pigment-rich biomass. Algal fat extracted from certain marine microalgae represents a vegetarian source of n-3-fatty acids (eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), γ-linolenic acid (GLA)). Gaining an overview of the production of microalgal products is a time-consuming task. Here, requirements and options of microalgae cultivation are summarized in a concise manner, including light and nutrient requirements, growth conditions, and cultivation systems. The rentability of microalgal products remains the major obstacle in industrial application. Key challenges are the high costs of commercial-scale cultivation, harvesting (and dewatering), and product quality assurance (toxin analysis). High-value food ingredients are commonly regarded as profitable despite significant capital expenditures and energy inputs. Improvements in capital and operational costs shall enable economic production of low-value food products going down to fishmeal replacement in the future economy.

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“…48 Besides people working in nuclear power plants that might be exposed to radioiodine emission, iodine ions can also come from other sources such as chemical plants, pharmaceutical industries, food processing, high-tech industries, and hospitals. Wastewater polluted with iodine causes contamination of potable and groundwater, 49 which will increase the risk of thyroid cancer. 50 Typically, exposure to iodine could present short-term effects such as (1) irritation, skin burns, and eyes damage; (2) fumes that might harshly irritate both nose and throat; and (3) headache, metallic taste, nausea, vomiting, diarrhea, and abdominal pain.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in the Removal of Radioactive Iodine and Iodide from the Environment

et al. 2023

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Iodine (I 2 ) in the form of iodide ions (I − ) is an essential chemical element in the human body. Iodine is a nonmetal that belongs to the VIIA group (halogens) in the periodic table. Over the last couple of centuries, the exponential growth of human society triggered by industrialization coincided with the use of iodine in a wide variety of applications, including chemical and biological processes. However, through these processes, the excess amount of iodine eventually ends up contaminating soil, underground water, and freshwater sources, which results in adverse effects. It enters the food chain and interferes with biological processes with serious physiological consequences in all living organisms, including humans. Existing removal techniques utilize different materials such as metal−organic frameworks, layered double hydroxides, ion-exchange resins, silver, polymers, bismuth, carbon, soil, MXenes, and magnetic-based materials. From our literature survey, it was clear that absorption techniques are the most frequently experimented with. In this Review, we have summarized current advancements in the removal of iodine and iodide from human-made contaminated aqueous waste.

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Cycling of iodine by microalgae: Iodine uptake and release by a microalgae biofilm in a groundwater holding pond

Cited by 19 publications

References 40 publications

Adsorption of Iodine from Aqueous Solution on Modified Silica Gel with Cyclodextrin Derivatives

Adsorption of Iodine from Aqueous Solution on Modified Silica Gel with Cyclodextrin Derivatives

Food Ingredients and Nutraceuticals from Microalgae: Main Product Classes and Biotechnological Production

Recent Advances in the Removal of Radioactive Iodine and Iodide from the Environment

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