Palygorskite for the uptake and removal of pharmaceuticals for wastewater treatment

Li, Zhaohui; Fitzgerald, Nicole M.; Jiang, Wei Teh; Lv, Guocheng

doi:10.1016/j.psep.2015.09.008

Cited by 18 publications

(9 citation statements)

References 36 publications

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“…2). Ibuprofen was removed within 50 h to undetectable concentrations and paracetamol was removed to acceptable levels in approximately 73−77 h. For IBU, the largest amount of this pharmaceutical was removed in 6−10 h. This quick removal may indicate not only biodegradation but also external sorption sites on the solids for IBU removal from water [40]. The removal of PARA was slower, for the concentration of 0.4 mg/L the largest amount of PARA was removed on the first 29 h and for the highest concentration, 1 mg/L, the time to reached equilibrium was more than 73 h. The uptake rates and removal percentages are presented in Table 1.…”

Section: Ibuprofen and Paracetamol Removal Performance By Activated Sludge And Comparison With Adsorption Processesmentioning

confidence: 98%

Degradation of widespread pharmaceuticals by activated sludge: Kinetic study, toxicity assessment, and comparison with adsorption processes

Quintelas

Mesquita

Torres

et al. 2020

Journal of Water Process Engineering

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The growing presence of pharmaceutical compounds in aqueous systems leads to the search for new efficient and eco-friendly solutions to this problem. Although pharmaceutical products are widely found in the aqueous environments, there is limited understanding of their ecological effects. To augment the removal of pharmaceuticals, a bench reactor was inoculated with activated sludge and fed with a synthetic medium. Two pharmaceuticals of widespread usage, ibuprofen (IBU) and paracetamol (PARA) in the range 0.4-1 mg L -1 were used. The uptake values increased from 0.192 to 0.660 mg g -1 for IBU and from 0.104 to 0.341 mg g -1 for PARA. The removal efficiency reached values from 99.1-99.5 % and is independent of the initial IBU concentration. For PARA the removal percentage ranged from 93.3-98.8 decreasing with the increase on the initial concentration. The removal mechanism is well described by pseudo-first order and pseudo-second order kinetic models for all concentrations tested. At same time, batch assays were performed in order to assess the toxicity of both pharmaceuticals into the activated sludge using quantitative image analysis (QIA). For IBU experiments, QIA studies showed that this compound favors the growth of aggregated biomass rather than filamentous bacteria. A comparison between this biological technology and adsorption by a commercial porous ceramic material and Pinus bark was also performed. The results showed that the biological technology allowed better results (99.5 % against 19.4 and 9.3 %, respectively for the ceramic material and Pinus bark) for IBU. The results obtained for PARA showed comparable results for the biological technology and for adsorption by the ceramic material. The activated sludge system presented here appears to be a promising treatment for pharmaceutical contaminated effluents and the biomass present in the activated sludge seems do not be negatively affected by the presence of high concentrations of both pharmaceuticals.

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Section: Ibuprofen and Paracetamol Removal Performance By Activated Sludge And Comparison With Adsorption Processesmentioning

confidence: 98%

Degradation of widespread pharmaceuticals by activated sludge: Kinetic study, toxicity assessment, and comparison with adsorption processes

Quintelas

Mesquita

Torres

et al. 2020

Journal of Water Process Engineering

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“…Several studies have demonstrated that increasing the interaction temperature increases the adsorption capacity of cationic PPs onto clay minerals (Chang et al, 2014;Y. Chen, Zhou, Liu, & Liang, 2010), whereas the opposite results were recorded for the same charge state (W.-T. Jiang, Chang, Tsai, & Li, 2016;Z. Li, Fitzgerald, Jiang, & Lv, 2016).…”

Section: Temperature Effectmentioning

confidence: 98%

“…Yet, the adsorption kinetic of PPs onto clay minerals is considered as spontaneous for the cation exchange mechanism, and other interactions are also significant for a very short interaction time (Z. Li et al, 2016;.…”

Section: Fixed-bed Adsorption Of Pps Onto Raw and Modified Clay Mineralsmentioning

confidence: 99%

Raw and modified clays and clay minerals for the removal of pharmaceutical products from aqueous solutions: State of the art and future perspectives

Thiebault

2019

Critical Reviews in Environmental Science and Technology

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The occurrence of pharmaceutical products (PPs) within environmental compartments challenges the scientific community and water treatment operators to find suitable and practicable removal solutions. Clay minerals are among the oldest and cheapest adsorbents used for the removal of organic and inorganic pollutants. However, despite their significant adsorption properties, little is known about their potential to remove organic contaminants such as pharmaceutical products from wastewater effluents. Hence, based on the latest published articles this review aims to standardize the adsorption properties of clay minerals for the removal of PPs. Specifically, the charge state of PPs appears to play a key role in their adsorption mechanism. In order to overcome the limitations of batch experiments (i.e. idealized solutions, static conditions) and design of a field solution, the impact of external parameters on the adsorption capacities of clay minerals is reviewed. The effect of thermal treatment and acid activation of clay minerals is also assessed in order to better understand the consequences of such modifications on the adsorption properties of clay-based adsorbents. Finally, even if most authors agree on the potential of clay-based adsorbents for the removal of PPs from wastewater, there remain significant gaps in the existing literature that need to be filled, with the aim of forecasting the real potential of clay-based treatment for the removal of pharmaceutical products at industrial scale.

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“…This process promotes the total mineralization of the pollutants, generating CO 2, H 2 O, and ionic compounds [17,18]. Some classes of compounds susceptible to degradation by photocatalysis are alkanes, chloroaliphatics, azo compounds, alcohols, carboxylic acids, phenols, chlorophenols, herbicides, surfactants, and dyes [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Miranda

Viana²,

Honorio³

et al. 2020

Minerals

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Titanium and zirconium oxides (TiO2 and ZrO2, respectively) were obtained from alkoxides hydrolyses, and then deposited into palygorskite clay mineral (Pal) to obtain new materials for photocatalytic applications. The obtained materials were characterized by structural, morphological, and textural techniques. X-ray diffraction (XRD) results confirmed the characteristic peaks of oxides and clay transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images of the modified palygorskite with both oxides showed that the clay was successfully modified by the proposed method. The increase in the specific surface area of the clay occurred when TiO2 and ZrO2 were deposited on the surface. The photocatalytic activity of these materials was investigated using the Remazol Blue anion dye under UV light. The evaluated systems presented high photocatalytic activity, reaching approximately 98% of dye discoloration under light. Thus, TiO2–Pal and ZrO2–TiO2–Pal are promising clay mineral-based photocatalysts.

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Palygorskite for the uptake and removal of pharmaceuticals for wastewater treatment

Cited by 18 publications

References 36 publications

Degradation of widespread pharmaceuticals by activated sludge: Kinetic study, toxicity assessment, and comparison with adsorption processes

Degradation of widespread pharmaceuticals by activated sludge: Kinetic study, toxicity assessment, and comparison with adsorption processes

Raw and modified clays and clay minerals for the removal of pharmaceutical products from aqueous solutions: State of the art and future perspectives

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

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