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You searched for: Journal name Environmental Science & Technology Remove constraint Journal name: Environmental Science & Technology Subject term pH Remove constraint Subject term: pH
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1. Acid Rock Drainage Treatment Using Membrane Distillation: Impacts of Chemical-Free Pretreatment on Scale Formation, Pore Wetting, and Product Water Quality

Author:
Hull Eric J.; Zodrow Katherine R.
Source:
Environmental Science & Technology 2017 v.51 no.20 pp. 11928-11934
ISSN:
1520-5851
Subject:
distillation; drainage; electrolytes; geothermal energy; heat; heavy metals; hydrophobicity; iron oxyhydroxides; methodology; minerals; models; oxidation; pH; rivers; sulfates; temperature; vapors; wastewater; water quality; United States
Abstract:
... Acid rock drainage (ARD) is a metal-rich wastewater that forms upon oxidation of sulfidic minerals. Although ARD impacts >12,000 miles of rivers in the U.S. and has an estimated cleanup cost of $32–$72 billion, the low pH and high metal concentrations in ARD make rapid, high volume treatment without chemical addition difficult. This research focuses on a novel method of ARD treatment, membrane dis ...
DOI:
10.1021/acs.est.7b02957

2. Adsorption, Aggregation, and Deposition Behaviors of Carbon Dots on Minerals

Author:
Liu Xia; Li Jiaxing; Huang Yongshun; Wang Xiangxue; Zhang Xiaodong; Wang Xiangke
Source:
Environmental Science & Technology 2017 v.51 no.11 pp. 6156-6164
ISSN:
1520-5851
Subject:
adsorption; aqueous solutions; carbon quantum dots; electrolytes; environmental factors; goethite; groundwater; hydrogen bonding; ionic strength; pH; sediments; soil; sorption isotherms; toxicity; van der Waals forces; zeta potential
Abstract:
... The increased production of carbon dots (CDs) and the release and accumulation of CDs in both surface and groundwater has resulted in the increasing interest in their research. To assess the environmental behavior of CDs, the interaction between CDs and goethite was studied under different environmental conditions. Electrokinetic characterization of CDs suggested that the ζ-potential and size dist ...
DOI:
10.1021/acs.est.6b06558

3. Aggregation Kinetics and Self-Assembly Mechanisms of Graphene Quantum Dots in Aqueous Solutions: Cooperative Effects of pH and Electrolytes

Author:
Li Qingqing; Chen Baoliang; Xing Baoshan
Source:
Environmental Science & Technology 2017 v.51 no.3 pp. 1364-1376
ISSN:
1520-5851
Subject:
risk; image analysis; aqueous solutions; coagulation; calcium; cations; magnesium; quantum dots; scanning electron microscopy; pH; potassium; sodium; transmission electron microscopy; graphene; nanoparticles; environmental fate; prediction
Abstract:
... The cooperative effects of pH and electrolytes on the aggregation of GQDs and the aggregate morphologies are characterized. Because GQDs have an average size of 9 nm with abundant O-functionalized edges, their suspension was very stable even in a high electrolyte concentration and low pH solution. Divalent cations (Mg²⁺ and Ca²⁺) excelled at aggregating the GQD nanoplates, while monovalent cations ...
DOI:
10.1021/acs.est.6b04178
CHORUS:
10.1021/acs.est.6b04178
Chorus Open Access:
10.1021/acs.est.6b04178

4. Aggregation Kinetics of Diesel Soot Nanoparticles in Wet Environments

Author:
Chen Chengyu; Huang Weilin
Source:
Environmental Science & Technology 2017 v.51 no.4 pp. 2077-2086
ISSN:
1520-5851
Subject:
acid deposition; aggregation behavior; aqueous solutions; coagulation; combustion; droplets; electrolytes; environmental fate; estuaries; freshwater; nanoparticles; pH; rain; soot; wet environmental conditions
Abstract:
... Soot produced during incomplete combustion consists mainly of carbonaceous nanoparticles (NPs) with severe adverse environmental and health effects, and its environmental fate and transport are largely controlled by aggregation. In this study, we examined the aggregation behavior for diesel soot NPs under aqueous condition in an effort to elucidate the fundamental processes that govern soot partic ...
DOI:
10.1021/acs.est.6b04575

5. Antibacterial Activity of Aluminum in Clay from the Colombian Amazon

Author:
Londono S. Carolina; Hartnett Hilairy E.; Williams Lynda B.
Source:
Environmental Science & Technology 2017 v.51 no.4 pp. 2401-2408
ISSN:
1520-5851
Subject:
Escherichia coli; aluminum; antibacterial properties; antibiotic resistance; antibiotics; bacteria; chemical analysis; clay; copper; humans; image analysis; iron; manganese; minimum inhibitory concentration; models; pH; pathogens; phospholipids; phosphorus; toxicity; zinc; Amazonia; Colombia
Abstract:
... The problems of antibiotic overuse compel us to seek alternative antibacterial agents. Some clays have been shown to kill antibiotic-resistant human pathogens and may provide an alternative to known antibiotics. Here we show that Al toxicity plays a central role in the antibacterial action of a kaolin-rich clay from the Colombian Amazon (AMZ). Antibacterial susceptibility testing shows minimum inh ...
DOI:
10.1021/acs.est.6b04670

6. Antibiotic Pollution in Marine Food Webs in Laizhou Bay, North China: Trophodynamics and Human Exposure Implication

Author:
Liu Sisi; Zhao Hongxia; Lehmler Hans-Joachim; Cai Xiyun; Chen Jingwen
Source:
Environmental Science & Technology 2017 v.51 no.4 pp. 2392-2400
ISSN:
1520-5851
Subject:
antibiotics; average daily intake; bioaccumulation; biotransformation; fluoroquinolones; food webs; human health; humans; hydrophobicity; invertebrates; macrolides; pH; pelagic fish; pollution; risk; risk management; trimethoprim; China
Abstract:
... Little information is available about the bioaccumulation and biomagnification of antibiotics in marine food webs. Here, we investigate the levels and trophic transfer of 9 sulfonamide (SA), 5 fluoroquinolone (FQ), and 4 macrolide (ML) antibiotics, as well as trimethoprim in nine invertebrate and ten fish species collected from a marine food web in Laizhou Bay, North China in 2014 and 2015. All th ...
DOI:
10.1021/acs.est.6b04556
PubMed:
28106989
PubMed Central:
PMC5618103

7. Antimony and Arsenic Behavior during Fe(II)-Induced Transformation of Jarosite

Author:
Karimian Niloofar; Johnston Scott G.; Burton Edward D.
Source:
Environmental Science & Technology 2017 v.51 no.8 pp. 4259-4268
ISSN:
1520-5851
Subject:
X-ray absorption spectroscopy; acid mine drainage; acid sulfate soils; anaerobic conditions; antimony; arsenic; goethite; iron; jarosite; lepidocrocite; pH
Abstract:
... Jarosite can be an important scavenger for arsenic (As) and antimony (Sb) in acid mine drainage (AMD) and acid sulfate soil (ASS) environments. When subjected to reducing conditions, jarosite may undergo reductive dissolution, thereby releasing As, Sb, and Fe²⁺ coincident with a rise in pH. These conditions can also trigger the Fe²⁺-induced transformation of jarosite to more stable Fe(III) mineral ...
DOI:
10.1021/acs.est.6b05335

8. Carbon and Phosphorus Removal from Primary Municipal Wastewater Using Recovered Aluminum

Author:
Chakraborty Tulip; Gabriel Michelle; Amiri Ali Safarzadeh; Santoro Domenico; Walton John; Smith Scott; Ray Madhumita B.; Nakhla George
Source:
Environmental Science & Technology 2017 v.51 no.21 pp. 12302-12309
ISSN:
1520-5851
Subject:
acidification; alum; aluminum; carbon; centrifugation; chemical oxygen demand; coagulants; coagulation; cost analysis; hydrochloric acid; magnesium ammonium phosphate; municipal wastewater; nitrogen content; pH; phosphorus; sludge; solubilization; sulfuric acid; total suspended solids
Abstract:
... In this work, recovery of aluminum from coagulated primary sludge and its reuse potential as secondary coagulant were investigated. The recovery process consisted of releasing the particle-bound aluminum from primary sludge by acidification (HCl or H₂SO₄), followed by separation using centrifugation for dissolved coagulant recovery. The recovered coagulant was then reused for treating primary wast ...
DOI:
10.1021/acs.est.7b03405

9. Censored Regression Modeling To Predict Virus Inactivation in Wastewaters

Author:
Brainard Julii; Pond Katherine; Hunter Paul R.
Source:
Environmental Science & Technology 2017 v.51 no.3 pp. 1795-1801
ISSN:
1520-5851
Subject:
DNA; RNA; feces; genome; humans; models; pH; pathogens; prediction; primary transmission; regression analysis; risk management; temperature; uncertainty; viruses; wastewater; Western Africa
Abstract:
... Among the many uncertainties presented by poorly studied pathogens is possible transmission via human fecal material or wastewaters. Such worries were a documented concern during the 2013 Ebola outbreak in West Africa. Using published experimental data on virus inactivation rates in wastewater and similar matrices, we extracted data to construct a model predicting the T90 (1 × log₁₀ inactivation m ...
DOI:
10.1021/acs.est.6b05190

10. Chlorination Kinetics of 11-Nor-9-carboxy-Δ9-tetrahydrocannabinol: Effects of pH and Humic Acid

Author:
Mackie Allison L.; Park Yu Ri; Gagnon Graham A.
Source:
Environmental Science & Technology 2017 v.51 no.18 pp. 10711-10717
ISSN:
1520-5851
Subject:
Cannabis sativa; byproducts; chlorination; chlorine; flow injection analysis; half life; humic acids; ions; mass spectrometry; metabolites; pH; phenol; phosphates; rivers; surface water; tetrahydrocannabinol; wastes; wastewater treatment
Abstract:
... The main psychoactive compound in marijuana, Δ⁹-tetrahydrocannabinol (THC), and its metabolites are emerging organic contaminants that have been detected in waste and surface waters. As legalization of marijuana for medical and recreational use continues, the effects of increased use and potency of marijuana on water and wastewater treatment processes and the environment should be considered. This ...
DOI:
10.1021/acs.est.7b02234

11. Cobinding of Pharmaceutical Compounds at Mineral Surfaces: Mechanistic Modeling of Binding and Cobinding of Nalidixic Acid and Niflumic Acid at Goethite Surfaces

Author:
Xu Jing; Marsac Rémi; Wei Cheng; Wu Feng; Boily Jean-François; Hanna Khalil
Source:
Environmental Science & Technology 2017 v.51 no.20 pp. 11617-11624
ISSN:
1520-5851
Subject:
adsorption; drugs; environmental fate; goethite; hydrogen bonding; hydroxyl radicals; mechanistic models; nalidixic acid; pH; prediction; salinity; sodium; sodium chloride
Abstract:
... Although emerging contaminants rarely exist individually in environmental contaminated systems, only limited information on their adsorption mechanisms in multicomponent solutions is currently available. To address this shortcoming, this work examines for the first time the accuracy of a surface complexation model in predicting the cooperative adsorption of nalidixic acid (NA) and niflumic acid (N ...
DOI:
10.1021/acs.est.7b02900

12. Competitive and Cooperative Effects during Nickel Adsorption to Iron Oxides in the Presence of Oxalate

Author:
Flynn Elaine D.; Catalano Jeffrey G.
Source:
Environmental Science & Technology 2017 v.51 no.17 pp. 9792-9799
ISSN:
1520-5851
Subject:
Fourier transform infrared spectroscopy; adsorption; binding capacity; bioavailability; coprecipitation; environmental science; goethite; heavy metals; hematite; nickel; oxalates; pH; sediments; soil; solubilization
Abstract:
... Iron oxides are ubiquitous in soils and sediments and play a critical role in the geochemical distribution of trace elements and heavy metals via adsorption and coprecipitation. The presence of organic acids may potentially alter how metals associate with iron oxide minerals through a series of cooperative or competitive processes: solution complexation, ternary surface complexation, and surface s ...
DOI:
10.1021/acs.est.7b02657

13. Coupled Effect of Ferrous Ion and Oxygen on the Electron Selectivity of Zerovalent Iron for Selenate Sequestration

Author:
Qin Hejie; Li Jinxiang; Yang Hongyi; Pan Bingcai; Zhang Weiming; Guan Xiaohong
Source:
Environmental Science & Technology 2017 v.51 no.9 pp. 5090-5097
ISSN:
1520-5851
Subject:
selenates; aerobic conditions; aeration; lepidocrocite; iron; electron transfer; selenium; pH; magnetite; oxygen; adsorption
Abstract:
... Although the electron selectivity (ES) of zerovalent iron (ZVI) for target contaminant and its utilization ratio (UR) decide the removal capacity of ZVI, little effort has been made to improve them. Taking selenate [Se(VI)] as a target contaminant, this study investigated the coupled influence of aeration gas and Fe(II) on the ES and UR of ZVI. Oxygen was necessary for effective removal of Se(VI) ...
DOI:
10.1021/acs.est.6b04832

14. Degradation of Bisphenol A by Peroxymonosulfate Catalytically Activated with Mn1.8Fe1.2O4 Nanospheres: Synergism between Mn and Fe

Author:
Huang Gui-Xiang; Wang Chu-Ya; Yang Chuan-Wang; Guo Pu-Can; Yu Han-Qing
Source:
Environmental Science & Technology 2017 v.51 no.21 pp. 12611-12618
ISSN:
1520-5851
Subject:
active sites; adsorption; bisphenol A; catalysts; catalytic activity; cations; hydroxyl radicals; iron; iron oxides; manganese; nanospheres; pH; peroxides; pollutants; remediation; sulfates; synergism
Abstract:
... A high-efficient, low-cost, and eco-friendly catalyst is highly desired to activate peroxides for environmental remediation. Due to the potential synergistic effect between bimetallic oxides’ two different metal cations, these oxides exhibit superior performance in the catalytic activation of peroxymonosulfate (PMS). In this work, novel Mn₁.₈Fe₁.₂O₄ nanospheres were synthesized and used to activat ...
DOI:
10.1021/acs.est.7b03007

15. Effect of Hydration Forces on Protein Fouling of Ultrafiltration Membranes: The Role of Protein Charge, Hydrated Ion Species, and Membrane Hydrophilicity

Author:
Miao Rui; Wang Lei; Zhu Miao; Deng Dongxu; Li Songshan; Wang Jiaxuan; Liu Tingting; Lv Yongtao
Source:
Environmental Science & Technology 2017 v.51 no.1 pp. 167-174
ISSN:
1520-5851
Subject:
bovine serum albumin; fouling; hydrophilicity; hydrophobicity; ionic strength; ions; microfiltration; models; pH; ultrafiltration
Abstract:
... To investigate the influence of hydration forces on the protein fouling of membranes and the major influence factors of hydration forces during the ultrafiltration process, bovine serum albumin (BSA) was chosen as model foulant. For various pH levels and hydrated ion and membrane species, the membrane–BSA and BSA–BSA interaction forces, and fouling experiments with BSA, as a function of ionic stre ...
DOI:
10.1021/acs.est.6b03660

16. Efficient Bacterial Inactivation by Transition Metal Catalyzed Auto-Oxidation of Sulfite

Author:
Chen Long; Tang Min; Chen Chuan; Chen Mingguang; Luo Kai; Xu Jing; Zhou Danna; Wu Feng
Source:
Environmental Science & Technology 2017 v.51 no.21 pp. 12663-12671
ISSN:
1520-5851
Subject:
Bacillus subtilis; Escherichia coli; NAD (coenzyme); Pseudomonas aeruginosa; bacteria; cobalt; copper; disinfection; iron; lakes; manganese; pH; pathogens; proteins; sulfates; sulfites; surface water; wastewater; wastewater treatment
Abstract:
... Disinfection is an indispensable process in wastewater treatment plants. New bacterial inactivation technologies are of increasing interest and persistent demand. A category of simple and efficient bactericidal systems have been established in this study, that is, the combination of divalent transition metal (Mn(II), Co(II), Fe(II), or Cu(II)) and sulfite. In these systems, metal catalyzed auto-ox ...
DOI:
10.1021/acs.est.7b03705

17. Efficient Formation of Light-Absorbing Polymeric Nanoparticles from the Reaction of Soluble Fe(III) with C4 and C6 Dicarboxylic Acids

Author:
Tran Ashley; Williams Geoffrey; Younus Shagufta; Ali Nujhat N.; Blair Sandra L.; Nizkorodov Sergey A.; Al-Abadleh Hind A.
Source:
Environmental Science & Technology 2017 v.51 no.17 pp. 9700-9708
ISSN:
1520-5851
Subject:
absorption; aerosols; benzene; biomass; burning; carbon; catalytic activity; color; elemental composition; environmental science; gases; ice nucleation; iron; maleic acid; nanoparticles; optical properties; pH; photooxidation; succinic acid
Abstract:
... The role of transition metals in the formation and aging of secondary organic aerosol (SOA) from aliphatic and aromatic precursors in heterogeneous/multiphase reactions is not well understood. The reactivity of soluble Fe(III) toward known benzene photooxidation products that include fumaric (trans-butenedioic) and muconic (trans,trans-2,4-hexadienedioic) acids was investigated. Efficient formatio ...
DOI:
10.1021/acs.est.7b01826

18. Efficient and Selective Uptake of TcO4– by a Cationic Metal–Organic Framework Material with Open Ag+ Sites

Author:
Sheng Daopeng; Zhu Lin; Xu Chao; Xiao Chengliang; Wang Yanlong; Wang Yaxing; Chen Lanhua; Diwu Juan; Chen Jing; Chai Zhifang; Albrecht-Schmitt Thomas E.; Wang Shuao
Source:
Environmental Science & Technology 2017 v.51 no.6 pp. 3471-3479
ISSN:
1520-5851
Subject:
X-ray diffraction; anion exchange; anions; aqueous solutions; cations; crystal structure; half life; hydrogen bonding; ligands; nitrates; nuclear fuels; pH; radiation resistance; radioactive waste; radionuclides; silver; sorbents; sorption; streams
Abstract:
... ⁹⁹Tc is one of the most problematic radioisotopes in used nuclear fuel owing to its combined features of high fission yield, long half-life, and high environmental mobility. There are only a handful of functional materials that can remove TcO₄– anion from aqueous solution and identifying for new, stable materials with high anion-exchange capacities, fast kinetics, and good selectivity remains a ch ...
DOI:
10.1021/acs.est.7b00339

19. Electrochemical Induced Calcium Phosphate Precipitation: Importance of Local pH

Author:
Lei Yang; Song Bingnan; van der Weijden Renata D.; Saakes Michel; Buisman Cees J. N.
Source:
Environmental Science & Technology 2017 v.51 no.19 pp. 11156-11164
ISSN:
1520-5851
Subject:
calcium; cathodes; crystallization; crystals; electrochemistry; hydroxyapatite; ions; pH; phosphorus; titanium; wastewater
Abstract:
... Phosphorus (P) is an essential nutrient for living organisms and cannot be replaced or substituted. In this paper, we present a simple yet efficient membrane free electrochemical system for P removal and recovery as calcium phosphate (CaP). This method relies on in situ formation of hydroxide ions by electro mediated water reduction at a titanium cathode surface. The in situ raised pH at the catho ...
DOI:
10.1021/acs.est.7b03909
PubMed:
28872838
PubMed Central:
PMC5628374

20. Electrochemical Investigation of Arsenic Redox Processes on Pyrite

Author:
Renock Devon; Voorhis James
Source:
Environmental Science & Technology 2017 v.51 no.7 pp. 3733-3741
ISSN:
1520-5851
Subject:
X-ray photoelectron spectroscopy; arsenic; arsenites; electrochemistry; hydrogen; oxidation; pH; platinum; pyrite
Abstract:
... The specific Eh–pH conditions and mechanism(s) for the reduction of arsenite, As(III), by pyrite are incompletely understood. A fundamental question is what role the pyrite surface plays in the reduction process. We used electrochemical methods to evaluate the reduction of As(III) under controlled redox conditions. As(III) reduction to elemental As(0) occurs on the pyrite surface under suboxic-red ...
DOI:
10.1021/acs.est.6b06018