Highly selective defluoridation of brick tea infusion by tea waste supported aluminum oxides

Peng, Chuanyi; Xi, Junjun; Chen, Guijie; Feng, Zhihui; Ke, Fei; Ning, Jingming; Li, Daxiang; Ho, Chi‐Tang; Cai, Hao; Wan, Xiaochun

doi:10.1002/jsfa.7893

Cited by 21 publications

(14 citation statements)

References 40 publications

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“…This could explain the changes in pH values of fluoride solutions before and after adsorption. Moreover, the bands that appeared in the range from 400 to 700 cm −1 in the Al-GS-F spectrum have been attributed to the vibration of the aluminum-fluoride bonds [26], as well as the band present at 880 cm −1 [31]. Besides, a band at 761.3 cm −1 can be observed after fluoride adsorption, corresponding to bending motion of CF2 and skeletal bending of CF-CH-CF [32].…”

Section: Arsenate and Fluoride Biosorption Kineticsmentioning

confidence: 86%

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Ramos-Vargas

Alfaro-Cuevas-Villanueva

Huirache–Acuña

et al. 2018

Applied Sciences

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Featured Application: The adsorbent materials under study could have a potential use for the decontamination of groundwater with high levels of arsenic and fluoride. It could be particularly suitable for application in water treatment for small communities.Abstract: The contamination of groundwater by arsenic and fluoride is a major problem worldwide, causing diseases in the population that uses these waters for their consumption. Therefore, the removal of these types of pollutants from groundwater is a very important issue. In this work, the removal of arsenate and fluoride from aqueous solutions by using aluminum-modified guava seeds (Al-GSs) was evaluated. Batch-type adsorption experiments were carried out with aqueous solutions of As(V) and F − and Al-GSs. The kinetic and equilibrium parameters of adsorption were determined, as well as the effects of adsorbent dose and pH. The adsorbent was characterized by scanning electron microscopy and infrared spectroscopy in order to determine its morphology and the functional groups present in the material. The results showed that hydroxyl and carboxyl are the main groups involved in the adsorption of As(V) and F − . The fluoride adsorption kinetics indicate that the equilibrium time was reached at 150 min and it can be described by the Lagergren model, while for As(V) the equilibrium time was lower (120 min) and the kinetic data were fitted well to the pseudo-second-order model. The Langmuir-Freundlich model can describe the adsorption equilibrium data in all cases. The fluoride adsorption capacity by Al-GS was 0.3445 mg/g, and for As(V) it was 4 mg/g. It can be established that the removal of arsenates and fluoride in Al-GSs is due to chemisorption on a heterogeneous surface.then consumption of these waters may lead to dental fluorosis. From 3 to 6 mg/L of fluoride, skeletal fluorosis may appear, and at higher fluoride levels (>10 mg/L) crippling skeletal fluorosis can be developed [3,4]; these types of fluorosis are irreversible, and no treatment can eliminate symptoms definitively. Keeping fluoride intake within safe levels is the only way to prevent these diseases [5,6]. People in several countries around the world are facing problems of high fluoride levels in drinking water; these problems are more severe and intense depending on different factors, like the geographical and economic status of the affected communities [7]. The World Health Organization (WHO) guidelines for drinking water quality have established that, for areas with a warm climate, fluoride concentration in water should remain below 1 mg/L, while this concentration could be raised up to 1.2 mg/ for areas with a cold climate [3]. In developing countries this problem is more acute, particularly in small urban communities and rural areas [5,8].On the other hand, arsenic content in drinking water is also a worldwide concern, and it represents a great threat to human health. Levels above 10 µg/L of arsenic, which is the maximum level recommended by the WHO, have been reported in drinking water from se...

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Section: Arsenate and Fluoride Biosorption Kineticsmentioning

confidence: 86%

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Ramos-Vargas

Alfaro-Cuevas-Villanueva

Huirache–Acuña

et al. 2018

Applied Sciences

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“…The fluoride content in the instant brick tea was determined using a fluoride ion measuring instrument (9609 BNWP fluoride ion selective electrode, Thermo Fisher Scientific, Pittsburgh, PA), following the method developed by Peng et al . The catechin and caffeine content was measured using HPLC, and the total polyphenol content was analyzed using ultraviolet–visible spectroscopy according to a previously described method . The content of the main metal ions (Al, K, Mg, Mn, Zn and Pb) was determined using microwave digestion coupled with inductively coupled plasma spectrometry …”

Section: Methodsmentioning

confidence: 99%

“…Brick teas are usually prepared from old leaves of the tea plant, in which large amounts of fluoride from the soil naturally accumulate . Cases of unsightly dental fluorosis and even crippling skeletal fluorosis related to the long‐term consumption of brick tea with high levels of fluoride have been discovered in China and other countries .…”

Section: Introductionmentioning

confidence: 99%

“…Cases of unsightly dental fluorosis and even crippling skeletal fluorosis related to the long‐term consumption of brick tea with high levels of fluoride have been discovered in China and other countries . In the last few years, a number of methods have been proposed for removing excessive fluoride from tea infusions or preventing fluoride from entering tea leaves . However, some problems remain regarding the practical application of these measures.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the feasibility of short‐term electrodialysis for separating naturally occurring fluoride from instant brick tea infusion

et al. 2019

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BACKGROUND: Removing excessive naturally occurring fluoride from tea and/or infusions is difficult because the process has low efficiency and causes secondary pollution. In this study, a novel electrodialysis (ED) technology was developed. We examined the effect of crucial parameters (electrolyte concentration, operation voltage, ED duration and initial concentration of the tea infusion) on defluoridation performance using a highly efficient ion-exchange membrane with five-compartment cells. RESULTS:The most effective ED system results were obtained at an electrolyte concentration of 10 g kg −1 and operating voltage of 20 V. Moreover, the fluoride removal capacity (10.70-66.93%) was highly dependent on the ED duration (1-15 min) and initial concentration of the tea infusion (0.5-10 g kg −1 ). The longer the ED duration and the lower the initial concentration, the higher was the defluoridation performance. During ED, limited loss of the main inclusions (total polyphenols, catechins, caffeine and selected ions) was observed. Furthermore, the D201 anion resin-filled ED stack (0.5-5 g) and improvement of concentrate compartment electrolyte (≥5 times the dilute compartment electrolyte) in the ED system enhanced the defluoridation rate significantly. CONCLUSION: ED is a potentially effective method that can be used for defluoridation in the deep processing of tea products. (Wan) † Chuan-yi Peng and Hai-feng Liu contributed equally to this work.Figure 4. Effect of ED duration on defluoridation capacity. ED process parameters were 20 V operation voltage, 10 g kg −1 initial concentration of the tea infusion, 10 g kg −1 electrolyte concentration and 30 L h −1 flow rate.

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“…This wastewater flows into Tshinane River. The tea processing waste is rich in antioxidant and antimicrobial phenolic compounds [2], lignocellulose [3] and catechins and caffeine, lignin, condensed tannins, structural proteins [4]. Thus the discharge of the black tea wastewater to the environment is a major challenge.…”

Section: Introductionmentioning

confidence: 99%

Impact of Tea Processing Water Wastes on Phytoplankton Composition of Tshinane River, Limpopo Province

Sinthumule¹,

Mokgoebo²,

Gumbo³

2017

Nov. 27-28, 2017 South Africa ASETWM-17, RCABES-17 &Amp; EBHSSS-17

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Abstract-The discharge of industrial waste water on freshwater resources is on the increase worldwide, including in South Africa. The study aimed at assessing the response of phytoplankton upon exposure to high levels of nutrients along the Tshinane River Limpopo Province. The study showed different phytoplankton assemblages with different changes in physico-chemical levels. Environmental factors do have a noticeable effect on phytoplankton abundance as it was shown by statistical analysis. Results computed by the Czekanowski coefficient showed that various environmental factors components contributed to the different composition and types of phytoplankton abundance (p<0.05). When environmental factors showed fluctuation (Increase or decrease) a different type of plankton was found to be tolerant to those levels. A total of 64 species were identified upstream and 103 species identified downstream. Phytoplankton spectrums were recorded from six taxonomic groups namely Chrysophyta, Dinophyta, Chlorophyta, Bacillariophyta, Cyanophyta and Dinophyta. The dominant taxonomic group was Chlorophyta (Downstream) and Bacillariophyta was the dominant phytoplankton upstream. The results supports the assumption that an increase in nutrients lead to a diverse phytoplankton species even if all the other parameters are within the South African Water Quality Range for Aquatic ecosystems. This shows that tea processing waste has a minimal impact on the ecosystem health of Tshinane River and the river is able to recover from the nutrient enrichment.

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Highly selective defluoridation of brick tea infusion by tea waste supported aluminum oxides

Abstract: Results from this study demonstrated that Tea-Al is a promising biosorbent useful for the removal of fluoride in brick tea infusion. © 2016 Society of Chemical Industry.

Cited by 21 publications

References 40 publications

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Evaluation of the feasibility of short‐term electrodialysis for separating naturally occurring fluoride from instant brick tea infusion

Impact of Tea Processing Water Wastes on Phytoplankton Composition of Tshinane River, Limpopo Province

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