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Mercury removal using ground and calcined mussel shell

Journal of Environmental Sciences 2013年第12期25卷 2476-2486页

作者： Susana Pea-Rodríguez Alipio Bermúdez-Couso Juan Carlos nóvoa-Muoz Manuel Arias-Estvez María J.Fernndez-Sanjurjo Esperanza lvarez-Rodríguez avelino núez-delgado rea de Edafoloxía e Qu' mica Agr' cola. Departamento de Bioloxía Vexetal e Ciencia do Solo. Univ. Vigo. Facultade de Ciencias Ourense Departamento de Edafoloxía e Química Agrícola. Univ. Santiago de Compostela. Escola Politcnica Superior campus univ. s/n

We determined mercury retention on calcined and ground mussel shell, in presence and absence of phosphate, using batch and stirred flow chamber experiments. In batch experiments the calcined shell exhibited higher Hg adsorption, with good fitting to Freundlich equation （R^2： 0.925-0.978）; the presence of phosphate increased Hg adsorption; mercury desorption was 13% or lower, diminishing up to 2% under the presence of phosphates. In stirred flow chamber experiments calcined shell retained more Hg than ground shells （6300 vs. 4000-5200 μmol/kg）; Hg retention increased an additional 40% on calcined shell and up to an additional 70% on ground shells when phosphates were present; mercury desorption was quite similar in all shell types （20%-34%）, increasing up to 49%-60% in ground shells when phosphates were present. The higher Hg adsorption on calcined shell would be related to its calcite and dolomite concentrations; mercury-phosphate interactions would cause the increase in Hg retention when phosphates are present. Data on Hg desorption suggest that Hg retention was not easily reversible after batch experiments, increasing in the stirred flow chamber due to convective flow. Calcined and ground mussel shells could be recycled removing Hg from water, with the presence of phosphates in solution improving efficacy.

关键词： adsorption desorption heavy metals pollution mercury mollusc shell

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Fundamentals and application in phytoremediation of an efficient arsenate reducing bacterium Pseudomonas putida ARS1

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Journal of Environmental Sciences 2024年第3期137卷 237-244页

作者： Ze-Wen Wang Guang Yang Jian Chen Yaoyu Zhou avelino nunez delgado Hui-Ling Cui Gui-Lan Duan Barry P.Rosen Yong-Guan Zhu Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450052China State Key Lab of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Cellular Biology and Pharmacology Florida International UniversityHerbert Wertheim College of MedicineMiamiFL33199USA University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China College of Resources and Environment Hunan Agricultural UniversityChangsha 410128China Department of Soil Science and Agricultura Chemistry Engineering Polytechnic SchoolUniversity of Santiago de CompostelaCampus Univ.s/n27002LugoSpain

Arsenic is a ubiquitous environmental ***-mediated arsenic biotransformations significantly infuence arsenic mobility and *** transformations by soil and aquatic organisms have been well documented,while little is known regarding effects due to endophytic *** endophyte Pseudomonas putida ARS1 was isolated from rice grown in arsenic contaminated *** ARS1 shows high tolerance to arsenite(As(Ⅲ))and arsenate(As(V)),and exhibits efficient As(V)reduction and As(Ⅲ)effux *** exposed to 0.6 mg/L As(V),As(V)in the medium was completely converted to As(Ⅲ)by *** ARS1 within 4 *** sequencing showed that *** ARS1 has two chromosomal arsenic resistance gene clusters(arsRCBH)that contribute to efficient As(V)reduction and As(Ⅲ)effux,and result in high resistance to *** globosa is a strong arsenic accumulator with high potential for arsenic phytoremediation,which takes up As(Ⅲ)more efficiently than As(V).Co-culture of *** ARS1 and *** enhanced arsenic accumulation in *** by 69%,and resulted in 91%removal of arsenic(at initial concentration of 0.6 mg/L As(V))from water within 3 *** study provides a promising strategy for in situ arsenic phytoremediation through the cooperation of plant and endophytic bacterium.

关键词： Arsenic Pseudomonas putida Arsenate reduction Endophyte Wolffia globosa Phytoremediation

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Highly efficient Uranium(Ⅵ) capture from aqueous solution by means of a hydroxyapatite-biochar nanocomposite: Adsorption behavior and mechanism

Highly efficient Uranium(Ⅵ) capture from aqueous solution b...

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第十一届重金属污染防治技术及风险评价研讨会

作者： Waqas Ahmed avelino nú?ez-delgado Sajid Mehmood Sehrish Ali Muhammad Qaswar Awais Shakoor Di-Yun Chen Guangdong Provincial Key Laboratory for Radionuclides Pollution Control and Resources School of Environmental Science and Engineering Guangzhou University School of Civil Engineering Guangzhou University Department of Soil Science and Agricultural Chemistry Engineering Polytechnic School Universidade de Santiago de Compostela College of Ecology and Environment Hainan University national Engineering Laboratory for Improving Quality of Arable Land Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and Technology Dalian University of Technology Department of Environment and Soil Sciences University of Lleida

The exploration and rational design of easily separable and highly efficient sorbents with the sufficient capability of retaining radioactive and toxic uranium U(VI) is *** this study,a hydroxyapatite (HAP) biochar nanocomposite (BR/HAP) was successfully fabricated from rice straw biochar (BR),to be used as a new and efficient adsorbent for removing U(VI) from aqueous *** BR and the BR/HAP composite were characterized via Brunauer-Emmett-Teller (BET),scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS),transmission electron microscopy (TEM),X-ray diffraction (XRD),Fourier transform infrared spectroscopy(FTIR) and X-ray photo electron spectroscopy (XPS) *** test results showed that BR/HAP exhibited remarkably higher adsorption capacity than the raw BR.A pseudo-second order kinetic model thoroughly explained the adsorption kinetics,providing the maximum U(VI) adsorption capacities (q) of 110.56 mg g (R=0.98) and428.25 mg g (R=0.99),for BR and BR/HAP,respectively,which was indicative of the rate-limited sorption via diffusion or surface complexation after rapid initial adsorption *** Langmuir isotherm model fitted the experimental data to accurately simulate the adsorption of U(VI) onto BR and BR/HAP (R=0.97 and R=0.99).The thermodynamic results showed negative values forΔGo,clearly indicating that the reaction was spontaneous,as well as positive values forΔHo(11.04 kJ mol and 28.86 kJ mol,respectively) andΔSo(88.97 kJ molK,and 183.42 kJ mol K),making clear the endothermic nature of U(VI) adsorption onto both sorbents,with an increase in randomness at a molecular *** spectroscopy and XPS spectrum further confirmed that the primary mechanisms were ion exchange with UOand surface complexion by-OH and-COOH,and phosphate groups notably were conducive to the excellent sorption capability of BR/HAP towards *** addition,BR/HAP showed an excellent reusability,after five adsorption-desorption experiments,the

关键词： Adsorption Biochar Hydroxyapatite nanocomposite Uranium Wastewater treatment

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Effects of Biochar on the Emissions of Greenhouse Gases from Sugarcane Residues Applied to Soils

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Agricultural Sciences 2017年第9期8卷 869-886页

作者： Thalita Fernanda Abbruzzini Mariana delgado Oliveira Zenero Pedro avelino Maia de Andrade Fernando Dini Andreote Julio Campo Carlos Eduardo Pellegrino Cerri Department of Soil Science “Luiz de Queiroz” College of Agriculture Piracicaba Brazil Institute of Ecology Universidad Nacional Autónoma de México México D.F. Mexico

The sugar and bioethanol industry generate large amounts of filter cake and vinasse, residues that are applied to sugarcane fields as conditioners and organic fertilizers. However, these may be significant sources of greenhouse gases emissions to the atmosphere. This study assessed the impact of sugarcane straw biochar on the emissions of CO2, CH4and n2O promoted by filter cake and vinasse applied to soil, and its effects on the chemical properties and bacterial communities of a Typic Hapludox and a Quartzipsamment. A laboratory incubation was conducted for 100 days with both soils under five treatments: vinasse and filter cake amendment (FV), plus biochar at 10 (FV + B10), 20 (FV + B20) and 50 (FV + B50) Mg·ha-1, and a control. Soil pH, available P and exchangeable base contents increased with biochar added to sandy soil. Mineral n decreased with biochar addition to both soils. The FV treatment increased CO2 emissions by 5-fold and 2.4-fold in sandy and clayey soils, respectively, compared to the control. Moreover, FV +B10 increased CO2 emissions by 4% and 6.4% in sandy and clayey soils, respectively, compared to FV. Cumulative n2O emissions in FV were 537% and 125% higher in sandy and clayey soils, respectively, compared to the control. nevertheless, increasing biochar amendment rates reduced n2O emissions from 24% to 34% in sandy soil, and from 14% to 56% in clayey soil. CH4 emissions were negligible. The effects of filter, vinasse and biochar amendments on soil amelioration were closely related to its buffering capacity. Temporal changes on bacterial community structure were more pronounced in the sandy soil compared to clayey, and indicated that n2O emission mitigation in clayey soil was directly related to biotic mechanisms, while abiotic mechanisms caused by biochar played a more important role in mitigating n2O emissions in sandy soil.

关键词： Filter Cake Fingerprinting nitrous Oxide Pyrolysis Carbon Soil Fertility Vinasse

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