Using Rice-husk-derived Porous Silica Modified with Recycled Cu from Industrial Wastewater and Ce to Remove Hg0 and NO from Simulated Flue Gases

Chen, Ming Yin; Tsai, Yun Chih; Tseng, Chih Fu; Lin, Hong Ping; Hsi, Hsing‐Cheng

doi:10.4209/aaqr.2019.09.0468

Cited by 16 publications

(3 citation statements)

References 37 publications

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“…Therefore, the challenge has been to find a cheaper carbon support for the SCR catalyst and then modify it to enhance its SCR catalytic performance. To date, its environmental benefits and abundance have convinced many researchers to devote their efforts to the production of activated carbon or other useful materials from various types of biomass (Jo et al, 2011), such as cotton stalks (Shen et al, 2015), peanut shell (Yang et al, 2018), rice straw (Cha et al, 2010), rice husk (Chen et al, 2019), etc. However, there have been few reported studies that have focused on the modification and optimization of the preparation of biochar from agricultural waste.…”

Section: Introductionmentioning

confidence: 99%

Agricultural Waste Derived Catalysts for Low Temperature SCR Process: Optimization of Preparation Process, Catalytic Activity and Characterization

Wang

et al. 2020

Aerosol Air Qual. Res.

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Carbon-based catalytic materials have received significant attention for low temperature flue gas denitrification (DeNO x ) process, due to their physicochemical properties and ease of modification. To improve the DeNO x efficiency, preparation of biochar catalyst supports was conducted that included the acid treatment of the agricultural wastes rice straw, corn cobs and lotus leaves. Taguchi experimental design (3 4 ) was employed to screen suitable carbon materials and optimize the preparation parameters of the biochar. All of the acid-modified and unmodified samples were evaluated to determine their performance and they were characterized by using SEM, BET and FT-IR analysis. The experimental and characterization results showed that acid modification of the biochars improved their DeNO x performance, which may have been due to the changes in the physical and chemical properties of the carbon material following the acid treatment. The optimum combination in the acid modification procedure was found to be the use of lotus leaf carbon treated with an acid/mass ratio of 1.50 and a pyrolysis temperature of 800°C. The biochar prepared using these optimum preparation parameters were then employed as a carrier to support an active catalyst component (MnO x ). The lotus leaf biochar supported 10 wt% manganese catalyst prepared using ultrasonic impregnation method exhibited nearly 90% NO x conversion at 250°C at a high space velocity of 45, 000 -1 , and it exhibited strong resistance to H 2 O. Additional studies showed that higher redox capacity and suitable surface acidity were two of the deciding factors in the improved low temperature SCR performance of the 10% Mn/LBC catalysts.

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Section: Introductionmentioning

confidence: 99%

Agricultural Waste Derived Catalysts for Low Temperature SCR Process: Optimization of Preparation Process, Catalytic Activity and Characterization

Wang

et al. 2020

Aerosol Air Qual. Res.

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“…Currently, the main methods of Hg 0 and AsH 3 removal involve adsorption and catalytic oxidation [12]. In particular, noble metal catalysts, such as Au [13], Ag [14], Pd [15,16], Pt [17], Ru [18], and Ir [19], have excellent catalytic activity. These materials have, thus, been used as adsorbents and catalysts to remove Hg 0 and AsH 3 .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous catalytic oxidation of elemental mercury and arsine over CeO2(111) surface: A density functional theory study

Zhang

Wang

et al. 2022

Preprint

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Ceria (CeO2) based materials are potential catalysts for the removal of the Hg0 and AsH3 present in reducing atmospheres. However, theoretical studies investigating the Hg0 and AsH3 removal capacity of ceria remain limited. In this study, the adsorption behavior and mechanistic pathways for the catalytic oxidation of Hg0 and AsH3 on the CeO2(111) surface, including the calculation of optimized adsorption configurations and energies, were investigated using density functional theory calculations. The results suggest that Hg0 and AsH3 are favorably adsorbed on the CeO2(111) surface, whereas CO is not, which is crucial for selective removal when CO is a desirable gas component. Further, AsH3 is adsorbed more favorably than Hg0. In addition, the calculations revealed that the Hg atom is initially adsorbed on the surface and then oxidized by lattice oxygen to form HgO. Concerning AsH3 decomposition, the stepwise dehydrogenation of AsH3 followed by bonding with lattice O atoms to form As-O bond seems the most plausible. Finally, the adsorbed As-O bond is further formed elemental As and As2O3. Therefore, CeO2 can adsorb and remove Hg0 and AsH3, making it a promising catalyst for the simultaneous catalytic oxidation of Hg0 and AsH3 in strongly reducing off-gas.

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“…It has been reported that surface modification of SiO 2 NPs enhances colloidal stability, biocompatibility, and target specificity as well as improving cellular uptake, all of which are necessary components of drug delivery and bioimaging applications (Besic Gyenge et al, 2011;Kralj et al, 2012;Liberman et al, 2014). The alteration of the surface chemistry of SiO 2 NPs has also been found to be beneficial in water treatment applications such as in nanofiltration processes (Ang et al, 2019) as well as other types of environmental contaminant remediation methods (Huang et al, 2003;Kim et al, 2005;Walcarius and Delacôte, 2005;Chen et al, 2019;Lin et al, 2019). SiO 2 NPs are also utilized as food additives, to improve building and construction materials, in microelectronics manufacturing, and as an ingredient in agricultural mixtures (Kang et al, 2011;Go et al, 2017;Palla et al, 2017;Shang et al, 2019;Park et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Toxic Effects of Hydroxyl- and Amine-functionalized Silica Nanoparticles (SiO2 and NH2-SiO2 NPs) on Caenorhabditis elegans

Que

Hou

Ang

et al. 2020

Aerosol Air Qual. Res.

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Silica nanoparticles (SiO 2 NPs) are engineered nanomaterials (ENMs) that have a wide range of application. Increased use in manufacturing has led to concerns about their environmental impact and possible adverse health effects. We conducted a comparative toxicity assessment of bare SiO 2-NPs and amine-functionalized SiO 2 NPs (NH 2-SiO 2 NPs) utilizing the Caenorhabditis elegans (C. elegans) in vivo model. L1 nematodes were exposed to exposure concentrations of 0.25, 0.5, 2.5, and 5 mg mL-1 until the worms reached the L4 stage. The chronic lethality and lifespan assays revealed a significant decrease in survival rate and lifespan at 2.5 and 5 mg mL-1 for nematodes exposed to bare SiO 2 NPs (89% and 88%; 22 days, p < 0.05 and 14 days, p < 0.05) and at 5 mg mL-1 for the NH 2-SiO 2 NPs-exposed group (86%; 20 days, p < 0.001). Exposure to all SiO 2 NP concentrations reduced progeny production to 79-60% while exposure to 2.5 and 5 mg mL-1 of NH 2-SiO 2 NPs significantly reduced the brood size to 64-63%. Neurobehavioral toxicity was also observed in the SiO 2 NP-exposed worms, which displayed significantly decreased head thrashing for up to 92-71% and in the NH 2-SiO 2 NPs-exposed worms which showed significantly reduced head thrashing movement for up to 91-85% at concentrations of 0.5-5 mg mL-1. Body bending movements were also significantly reduced at 0.5-5 mg mL-1 SiO 2 NPs (71-34%) and 2.5-5 mg mL-1 NH 2-SiO 2 NPs (94-66%). Significant shortening of body size was also observed in nematodes exposed to 0.5-5 mg mL-1 for both SiO 2 NPs (93-81%) and NH 2-SiO 2 NPs (94-88%). Overall, bare SiO 2 NPs were observed to be more toxic due to the negatively charged surface OH groups, which may have disrupted protein homeostasis, resulting in the observed toxicities. We suggest that functionality is an important indicator in nanosafety evaluations.

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Using Rice-husk-derived Porous Silica Modified with Recycled Cu from Industrial Wastewater and Ce to Remove Hg0 and NO from Simulated Flue Gases

Cited by 16 publications

References 37 publications

Agricultural Waste Derived Catalysts for Low Temperature SCR Process: Optimization of Preparation Process, Catalytic Activity and Characterization

Agricultural Waste Derived Catalysts for Low Temperature SCR Process: Optimization of Preparation Process, Catalytic Activity and Characterization

Simultaneous catalytic oxidation of elemental mercury and arsine over CeO2(111) surface: A density functional theory study

Toxic Effects of Hydroxyl- and Amine-functionalized Silica Nanoparticles (SiO2 and NH2-SiO2 NPs) on Caenorhabditis elegans

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