Integrating photochemical vapor generation with photo-oxidation trapping for effective mercury removal from polluted water and its on-line monitoring

Zhang, Ruoxi; Shen, Baogen; Li, Chenghui; Zheng, Chengbin; Hou, Xiandeng

doi:10.1016/j.microc.2016.06.014

Cited by 14 publications

(1 citation statement)

References 31 publications

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“…The removal of pollutants from urban and industrial wastewaters is one of the most important issues to be solved by modern research. In fact, water pollution has increased in the last decades by the virtue of the disposal of industrial effluents enriched with toxic species [1] which has hazardous effects on flora, fauna, and humans. Moreover, the growth of the world population results in a limitation of water supplies and scarcity of water resources, therefore the necessity of clean water has become fundamental for our society [1,2].…”

Section: Introductionmentioning

confidence: 99%

An Easy Synthesis for Preparing Bio-Based Hybrid Adsorbent Useful for Fast Adsorption of Polar Pollutants

et al. 2019

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For the first time, γ-Al2O3 and Bio-Based Substances (BBS) hybrids (A-BBS) were prepared through a simple electrostatic interaction occurring between alumina, used as a support, and BBS (Bio-Based Substance from composted biowastes) carrying positive and negative charges, respectively. We evaluated the optimal amount of BBS to be immobilized on the support and the stability of the resulting A-BBS in order to use this novel hybrid material as an adsorbent for the removal of polar pollutants. Characterization was carried out by X-Ray Diffraction (XRD) for evaluating the crystal structure of the support, Fourier transform infrared spectroscopy (FT-IR) to evidence the presence of BBS on the hybrid material, thermogravimetric analysis (TGA) to measure the thermal stability of the hybrid materials and quantify the BBS amount immobilized on the support, N2 adsorption at 77 K for the evaluation of the surface area and porosity of the systems, Zeta potential measurements to evaluate the effect of BBS immobilization on the surface charge of the particles and choose the substrates possibly interacting with them. Firstly, we tested the adsorption capability of three samples differently coated with BBS toward cationic species considering various adsorbate/adsorbent ratio. Crystal Violet (CV) was chosen as model pollutant to compare the performance of the hybrid materials with those of other materials described in the literature. The adsorption data were modeled by Langmuir and Freundlich adsorption isotherms. Then, we studied the adsorption capability of the developed material towards molecules with different structures; for this purpose, two contaminants of emerging concerns (carbamazepine and atenolol) were tested. The results indicate that A-BBS could be applied in wastewater treatment for the removal of a significant amount of polar species. In addition, a comparison with literature data concerning CV adsorption was carried out in order to evaluate the environmental impact of synthetic routes used to prepare different adsorbents.

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Section: Introductionmentioning

confidence: 99%

An Easy Synthesis for Preparing Bio-Based Hybrid Adsorbent Useful for Fast Adsorption of Polar Pollutants

et al. 2019

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Kinetic Analysis of the Decomposition Reaction of the Mercury Jarosite in NaOH Medium

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et al. 2017

Int. J. Chem. Kinet.

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This work presents the kinetic study of the decomposition in NaOH medium of mercury jarosite whose approximate formula is [Hg 0.39 (H 3 O) 0.22 ]Fe 2.71 (SO 4 ) 2.17 (OH) 4.79 (H 2 O) 2.09 . The reaction progress takes place on the surface of the compound with diffusion of the hydroxyl ions (OH − ) from the solution to the particle surface moving the reaction front toward the interior of the particle, with the release of ions SO 4 2and Hg 2+ from the core to the reaction medium. The decomposition curve can be described by three kinetics stages: an induction period followed by a progressive conversion period and ending the reaction in the stabilization zone. The results of X−ray diffraction showed that as the decomposition reaction progresses the partially decomposed solids lost its crystallinity ending as amorphous solids. For the induction period, the reaction order (n) was 0.52 for [OH − ] < 0.0187 mol L −1 and when [OH − ] > 0.0187 mol L −1 n = 1.48, whereas the calculated activation energy (E a ) was 81.7 kJ mol −1 . For the progressive conversion period n = 0.99 for [OH − ] > 0.0057 mol L −1 and for lower concentrations n 0, with E a = 56.9 kJ mol −1 , confirming that the decomposition process is controlled by the chemical reaction. Based on the calculated kinetic parameters, the partial

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Characterization of Mercury Jarosite

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Patiño

Flores

et al. 2017

The Minerals, Metals &Amp; Materials Series

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Integrating photochemical vapor generation with photo-oxidation trapping for effective mercury removal from polluted water and its on-line monitoring

Cited by 14 publications

References 31 publications

An Easy Synthesis for Preparing Bio-Based Hybrid Adsorbent Useful for Fast Adsorption of Polar Pollutants

An Easy Synthesis for Preparing Bio-Based Hybrid Adsorbent Useful for Fast Adsorption of Polar Pollutants

Kinetic Analysis of the Decomposition Reaction of the Mercury Jarosite in NaOH Medium

Characterization of Mercury Jarosite

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