Efficient photocatalytic removal of aqueous NH4+–NH3 by palladium-modified nitrogen-doped titanium oxide nanoparticles under visible light illumination, even in weak alkaline solutions

Sun, Dechen; Sun, Wuzhu; Yang, Weiyi; Li, Qi; Shang, Jian Ku

doi:10.1016/j.cej.2014.12.012

Cited by 47 publications

(17 citation statements)

References 51 publications

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“…The concentrations of NH4-N in large areas were 0.5~1.0 mg/L in 2006 and it increased to 1.0~1.5 mg/L in 2016. Release of wastewater from factories, agricultural runoff, and domestic sewage constituted both point and non-point sources of NH4-N [49]. The rapid development of the study area contributed to the increasing of NH4-N pollution from 2006 to 2016.…”

Section: Groundwater Geochemical Characteristicsmentioning

confidence: 99%

The Spatial and Temporal Variability of Groundwater Vulnerability and Human Health Risk in the Limin District, Harbin, China

Huang

Zuo

et al. 2018

Water

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This study aimed to analyze the variations in groundwater quality, vulnerability and potential health risk from 2006 to 2016 in the Limin District, Harbin, China. Groundwater geochemical characteristics were described using statistical analysis and Piper diagrams. A modified DRASTIC model that combined factors of intrinsic aquifer vulnerability and land use was applied to assess groundwater vulnerability. The weights of parameters were adjusted by using the analytic hierarchy process (AHP) to optimize the model. The non-carcinogenic health risk was estimated by the Unites States Environmental Protection Agency (USEPA) model. Results suggested that concentrations of NH 4-N, Fe and Mn in groundwater exceeded the limits both in 2006 and in 2016. The concentration of Fe in the groundwater showed more significant variation between 2006 and 2016 than the other parameters. Very high vulnerability zones increased from 6.3% in 2006 to 16.9% in 2016, and distributed on agricultural land, indicating that agriculture was still a major source of pollution. Mn and NO 3-N contributed the most to human health risks in 2006 and 2016, respectively. This study highlights the influence of groundwater quality variation in decadal exploitation on human health.

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Section: Groundwater Geochemical Characteristicsmentioning

confidence: 99%

The Spatial and Temporal Variability of Groundwater Vulnerability and Human Health Risk in the Limin District, Harbin, China

Huang

Zuo

et al. 2018

Water

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“…Anatase TiO 2 exhibits superior photoactivity under UV light irradiation and is the most frequently used photocatalyst in water treatment process [15][16][17][18][19], but its wide band gap (3.2 eV) has obviously hindered its sufficient utilization of sunlight [20]. Therefore, some composite photocatalysts about anatase TiO 2 with visible-light response had been reported by many researchers in recent years [21][22][23][24][25][26][27][28][29][30]. For instance, Zhao et al synthesized a BiOBr-TiO 2 -graphene composite by using graphene as a nano-filler [31].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of magnetically separable Fe3O4@PANI/TiO2 photocatalyst with fast charge migration for photodegradation of EDTA under visible-light irradiation

Tian

Zhao

et al. 2016

Chemical Engineering Journal

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“…When the solution pH is higher than 9.26, the dominant species of aqueous ammonia is NH 3 . The proportion of

is reversely proportional with the solution pH when < 9.26 (Sun et al, 2015 ). Thus, ammonia degradation efficiency decreases in neutral or acidic solutions.…”

Section: Resultsmentioning

confidence: 99%

High Efficient Visible-Light Photocatalytic Performance of Cu/ZnO/rGO Nanocomposite for Decomposing of Aqueous Ammonia and Treatment of Domestic Wastewater

Hou

Petropoulos

et al. 2018

Front. Chem.

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Photocatalytic removal of ammonium-nitrogen (NH4+-N) from water using solar energy is an approach of high interest and applicability due to the convenience in application. ZnO has a great potential in photocatalytic decomposition of NH4+-N and conversion of this nutrient to under visible light irradiations. However the applicability of pristine ZnO though is limited due to its reduced capacity to utilize light from natural light. Herein, we report a two-step ZnO-modified strategy (Cu-doped ZnO nanoparticles, immobilized on reduced graphene oxide (rGO) sheets) for the promotion of photocatalytic degradation of NH4+-N under visible light. UV-Vis spectra showed that the Cu/ZnO/rGO can be highly efficient in the utilization of photons from the visible region. Hence, Cu/ZnO/rGO managed to demonstrate adequate photocatalytic activity and effective NH4+-N removal from water under visible light compared to single ZnO. Specifically, up to 83.1% of NH4+-N (initial concentration 50 mg·L−1, catalyst dosage 2 g·L−1, pH 10) was removed within 2 h retention time under Xe lamp irradiation. From the catalysis, the major by-product was N2. The high ammonia degradation efficiency from the ZnO/Cu/rGO is attributed to the improvement of the reactive oxygen species (ROSs) production efficiency and the further activation of the interfacial catalytic sites. This study also demonstrated that such nanocomposite is a recyclable agent. Its NH4+-N removal capacity remained effective even after five batch cycles. In addition, Cu/ZnO/rGO was applied to treat real domestic wastewater, and it was found that chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) removal efficiencies can reach 84.3, 80.7, and 90.3%, respectively. Thus, Cu/ZnO/rGO in the presence of solar light can be a promising photocatalyst in the field of wastewater treatment.

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Efficient photocatalytic removal of aqueous NH4+–NH3 by palladium-modified nitrogen-doped titanium oxide nanoparticles under visible light illumination, even in weak alkaline solutions

Cited by 47 publications

References 51 publications

The Spatial and Temporal Variability of Groundwater Vulnerability and Human Health Risk in the Limin District, Harbin, China

The Spatial and Temporal Variability of Groundwater Vulnerability and Human Health Risk in the Limin District, Harbin, China

Synthesis of magnetically separable Fe3O4@PANI/TiO2 photocatalyst with fast charge migration for photodegradation of EDTA under visible-light irradiation

High Efficient Visible-Light Photocatalytic Performance of Cu/ZnO/rGO Nanocomposite for Decomposing of Aqueous Ammonia and Treatment of Domestic Wastewater

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