Photocatalytic degradation of trichloroethylene in aqueous phase using nano-ZNO/Laponite composites

Joo, Jin Chul; Ahn, Chang Hyuk; Jang, Dae Gyu; Yoon, Young H.; Kim, Jong Kyu; Campos, Luiza C.; Ahn, Hosang

doi:10.1016/j.jhazmat.2013.10.017

Cited by 43 publications

(32 citation statements)

References 18 publications

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“…Similar to previous findings in which the photocatalyst amounts were directly proportional to the overall photocatalytic reaction rates [ (MZBRC) increased (see Table 2). Similar to previous findings in which the photocatalyst amounts were directly proportional to the overall photocatalytic reaction rates [4,10,21,22], a linear regression (R 2 = 0.99) between the Kapp value and the ZBRC loading amount (MZBRC) was obtained within the evaluated range of MZBRC. Because the increased MZBRC increased the number of active sites available for both sorption and photocatalysis, more TCE and intermediate molecules were expected to be sorbed and degraded by the increased number of holes and •OH radicals [4,10].…”

Section: Effect Of the Zbrc Loading Amountssupporting

confidence: 87%

“…The TCE removal efficiency in aqueous solutions by sorption to ZBRC was close to 60%, and this higher sorption capacity of ZBRC compared to that of other supports (mesoporous clays and polymer films) [10] was mainly due to the low chain rigidity and the low degree of cross-linking of the amorphous BR structures [19,20]. When considering that the dynamic mass transfer of hydrophobic TCE in the aqueous phase to ZBRC involves both partitioning and diffusion of TCE through non-crystalline BR [19,20], the higher TCE sorption capacity to ZBRC with a low degree of cross-linking is expected.…”

Section: Coupled Removal Of Tce Using the Nanoscale Zno/polybutadienementioning

confidence: 75%

“…Table 2 presents the photocatalytic efficiency of ZBRC (Kapp = 0.067 min −1 ), which was two times higher than that of the nanoscale ZnO particles (Kapp = 0.030 min −1 ), although the surface area of the nanoscale ZnO particles exposed to UV irradiation was expected to be higher. Given that the photocatalytic reaction rate (Kapp) is proportional to the fraction of the surface coverage by TCE to be degraded [2,10], this result could be due to the fact that the surface of the ZBRC was covered with the sorbed TCE molecules, resulting in a higher TCE removal efficiency through coupled reaction processes (sorption, photolysis, and photocatalysis). Additionally, the deposition of nanoscale ZnO particles could reduce the UV intensity flux and block the ZnO surface available for photon sorption.…”

Section: Coupled Removal Of Tce Using the Nanoscale Zno/polybutadienementioning

confidence: 99%

“…The Kapp value increased in the range of 0.016-0.096 min −1 as the loading amount of ZBRC This phenomenon is due to the fact that the TCE molecules saturated the ZBRC surface and reduced the photonic efficiency, leading to photocatalyst deactivation [4,7,10,21,22]. Additionally, continuously-produced intermediates could be competitively sorbed and degraded by the photocatalytic activity; thus, the degradation of TCE was interfered at high concentrations of TCE.…”

Section: Effect Of the Zbrc Loading Amountsmentioning

confidence: 99%

“…In the last three decades, heterogeneous photocatalytic oxidation processes with TiO 2 -based materials and binary oxides have been investigated for the remediation of water resources contaminated by recalcitrant hydrocarbons [1][2][3][4][5][6][7][8][9][10][11]. These studies have reported that highly reactive transitory species (e.g., superoxide radical (O 2 · − ), hydroxyl radicals (·OH), and hydrogen peroxide (H 2 O 2 )) involved in the heterogeneous photocatalytic reactions effectively degrade various ambiguous…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Removal of Trichloroethylene in Water Using Nano-ZnO/Polybutadiene Rubber Composites

et al. 2016

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An innovative nanoscale ZnO/polybutadiene rubber composite (ZBRC) was developed as a valid alternative to TiO 2 particles or immobilized TiO 2 for the mineralization of chlorinated hydrocarbons without difficulties in the recovery of nanoscale photocatalyst particles. A synergistic increase in the removal of 1,1,2-trichloroethylene (TCE) through the coupled reaction processes (i.e., sorption, photolysis, and photocatalysis) was observed because sorption of TCE to the ultraviolet(UV)-transparent polybutadiene rubber occurred, and was coupled with the heterogeneous photocatalytic reactions with nanoscale ZnO particles on the surface of ZBRC. The removal rate of TCE decreased with an increase in the initial concentration of TCE because of both inhibited generation of electron-hole pairs and deficiency of photons to activate ZnO particles. Also, the TCE removal rate increased as the loading amount of ZBRC increased. Based on satisfactory linear regressions (R 2 ≥ 0.94) between the apparent degradation rate constant (K app ) and the initial concentration vs. the ZBRC loading amount, the K app values can be estimated, a priori, without performing photocatalytic experiments. The removal efficiencies were more significantly affected by the changes in the initial concentration of TCE and the ZBRC loading amounts than by the changes in light intensity and pH in aqueous solutions. From the results of response surface analysis, the greater removal efficiencies of TCE were achieved with higher pH values, greater amounts of ZBRC, and greater intensity of light. Based on these results, newly-developed ZBRC with both high removal efficiency and low cost performs as a valid alternative to TiO 2 particles or immobilized TiO 2 for the mineralization of chlorinated hydrocarbons in various environmental and industrial matrices.

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Section: Effect Of the Zbrc Loading Amountssupporting

confidence: 87%

Section: Coupled Removal Of Tce Using the Nanoscale Zno/polybutadienementioning

confidence: 75%

Section: Coupled Removal Of Tce Using the Nanoscale Zno/polybutadienementioning

confidence: 99%

Section: Effect Of the Zbrc Loading Amountsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Removal of Trichloroethylene in Water Using Nano-ZnO/Polybutadiene Rubber Composites

et al. 2016

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Photocatalytic degradation of trichloroethylene over BiOCl under UV irradiation

Liu

Yang

Zhen

et al. 2018

Applied Organom Chemis

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In this study, BiOCl samples were synthesized under different pH values and characterized by XRD, SEM, UV-vis DRS, BET, photoelectrochemical measurement and PL. The photocatalytic performances of the as-prepared samples were evaluated through the decomposition of trichloroethylene (TCE) under UV irradiation. The influences of several parameters such as solution pH and common inorganic anions on TCE removal were investigated. Results indicated that BiOCl-0.6 exhibited better photocatalytic performance than BiOCl-6.0 because of its higher migration ability of photo-induced carrier. The photocatalytic degradation of TCE over BiOCl-0.6 followed pseudo first-order kinetics and appeared to be more efficient in acidic solution than in alkaline. TCE was almost completely dechlorinated in 120 minutes. The inhibiting effect of naturally occurring anions was in the order of HCO 3 ->SO 4 2->NO 3 -, while Clexhibited a dual effect. Moreover, BiOCl-0.6 exhibited superior reusability after three cycles of repetition tests.

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Photocatalytic activity of Ag‐ZnO heterostructure for degradation of rhodamine B under direct sunlight

Zhai

Wang

Sun

et al. 2014

Crystal Research and Technology

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Ag‐ZnO heterostructure was obtained through a simple method that is suitable for general laboratory production. The X‐ray diffraction (XRD), transmission electron microscopy (TEM) results showed that Ag‐ZnO heterostructure had excellent purity and crystalline properties. Meanwhile, the catalytic degradation results demonstrated that it had high photocatalytic activity to the degradation of rhodamine B (RhB). Besides, in order to explore the optimum catalytic activity of the sample, the influences of experimental parameters including additives, the amount of catalyst, the concentration and initial pH of RhB were studied in detail.

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Photocatalytic degradation of trichloroethylene in aqueous phase using nano-ZNO/Laponite composites

Cited by 43 publications

References 18 publications

Enhanced Removal of Trichloroethylene in Water Using Nano-ZnO/Polybutadiene Rubber Composites

Enhanced Removal of Trichloroethylene in Water Using Nano-ZnO/Polybutadiene Rubber Composites

Photocatalytic degradation of trichloroethylene over BiOCl under UV irradiation

Photocatalytic activity of Ag‐ZnO heterostructure for degradation of rhodamine B under direct sunlight

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