David Cocke

David Cocke
Lamar University · Department of Chemical Engineering

PhD Physical Chemistry

About

242
Publications
26,526
Reads
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8,704
Citations
Citations since 2016
10 Research Items
3327 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
Additional affiliations
June 1989 - May 2001
Lamar University
Position
  • Gill Professor of Chemistry

Publications

Publications (242)
Article
The scarcity of fresh water resources and the need for additional water supplies are critical in many regions of the world. Treatment of wastewater and its reuse can partially resolve this issue. Due to the increase in use and number of heavy duty vehicles for transportation purpose the wastewater generated from truck wash has been escalated during...
Chapter
Full-text available
Complex multi-metal catalysts require several stages in their preparation. These are: co-mixing, co-precipitation, milling and sol -gel, drying, dehydroxylation, and calcination and sometimes regeneration of the hydroxide by rehydration. These processes require thermal analysis (DTA, TGA, DSC) and accompanying off gas analysis, plus one or more of...
Chapter
Full-text available
The US EPA regards “emerging pollutants” as new unregulated chemicals which impact the environment and human health. Many chemicals such as analgesics, anti -inflammatories, beta-blockers, antibiotics, and antimicrobials are not being effectively removed in water treatment. Triclosan, a ubiquitous antimicrobial that is widely used in antibacterial...
Chapter
The US EPA regards “emerging pollutants” as new unregulated chemicals which impact the environment and human health. Many chemicals such as analgesics, anti-inflammatories, beta-blockers, antibiotics, and antimicrobials are not being effectively removed in water treatment. Triclosan, a ubiquitous antimicrobial that is widely used in antibacterial p...
Chapter
Full-text available
Complex multi-metal catalysts require several stages in their preparation. These are: co-mixing, co-precipitation, milling and sol-gel, drying, dehydroxylation, and calcination and sometimes regeneration of the hydroxide by rehydration. These processes require thermal analysis (DTA, TGA, DSC) and accompanying off gas analysis, plus one or more of t...
Chapter
Introduction Translational Research Innovation Layered Double Hydroxides and Hydrotalcite Like Materials The DNA of Innovators Conclusions
Chapter
Introduction Energy Research and LDH Advantages and Challenges Conclusion
Chapter
Layered Double Hydroxides (LDH) are being used in energy related research for last several years. Among others, research interests include synthesis of catalysts, electrocatalysts, photocatalysts, electrode materials for batteries and super capacitors, and luminescence materials. They can be also applied for the production of renewable energy sourc...
Chapter
The process of technological innovation embraces a sequence of activities that translates technical and scientific knowledge into physical reality to be used on a scale having substantial societal impact. This goes beyond invention to accumulation of technical data, expansion of necessary knowledge, transformation into product and its diffusion and...
Article
Sulfur emissions cause several environmental problems including acid rain. According to the U.S. Environmental Protection Agency (EPA), >95% of SO 2 emissions are from fossil fuel combustion. Although EPA reduced the allowable sulfur levels in gasoline from 300 ppmw to 30 ppmw, and in diesel fuel from 500 ppmw to 15 ppmw, more competent desulfuriza...
Article
The presence of lead hydroxides in “pregnant cyanide solution” decreases the quality of the Dore obtained in the recovery processes of gold and silver, so it is convenient to remove them. The adsorbent capacity of the low cost cow bone powder was investigated for the removal of lead ions from a solution of lead hydroxide complexes at different init...
Article
Green rust (GR) is an important intermediate Layered Double Hydroxide (LDH), which exists in oxidative transformation of iron(II) phase. Anionic and cationic species can replace their corresponding parts in the layered structure, and different species can also be accumulated in between the layers. GR can play an important role in wastewater remedia...
Article
Arsenic contamination from groundwater is a worldwide problem. It is considered as one of the toxic materials being controlled by Environmental Protection Agencies in several developed and developing countries. The most common form of inorganic arsenic in natural water system is arsenate and arsenite. Arsenite (As(III)) is more toxic than Arsenate...
Article
A new paradigm is rapidly developing, with the increasing electronic sophistication of teaching methods and classrooms, for problem-based learning (PBL). This paper describes the study being performed in the Chemical Engineering Department at Lamar University to integrate best practice pedagogy with computer-aided modeling and simulation into a PBL...
Conference Paper
Layered double hydroxides are produced as an intermediate phase during in-situ electrochemical coagulation technique using iron sacrificial electrodes. Its structure consists of cationic layers, Fe(OH) 2n+, alternating with anionic layers stacked in a six-layer repeating sequence, giving rise to a hexagonal or pseudohexagonal symmetry. This Fe-LDH...
Conference Paper
Electrocoagulation (EC) is an emerging technology mainly used for wastewater treatment. In this process, in situ coagulants are produced by passing electric current through a conductive aqueous media in presence of sacrificial electrodes. When iron is used as electrodes, layered double hydroxides (LDH) or green rust are formed as intermediates that...
Conference Paper
Due to the limited clean water resources of our planet, an urgent need exists for efficient technological development to treat wastewater for re-use. Several water treatment methods and instruments are currently available that partially achieve this goal. The cost and treatment efficiencies depend on the instrument type used and their application....
Conference Paper
Textile industries use various kinds of chemicals including dyestuffs and pigments during dyeing and finishing processes. The effluent from these processes includes suspended particles, strong color, high pH and high chemical oxygen demand (COD) that are extremely toxic and make environmental hazard. Although physical, chemical, photochemical, and...
Article
Chemical reactions of metals and strongly interacting alloys such as Cu-Mn, Ni-Ti, Ni-Hf and Ni-Zr with oxygen and hydrogen play important roles in the preparation, activation, and regeneration of many important heterogeneous catalytic systems involving supported and unsupported metals and alloys. Recent advances in the understanding of metal and a...
Article
The metal-oxide interface is a crucial zone in the fundamental understanding of oxide growth and growth instabilities. However, obtaining fundamental information on this buried interface has proven extremely difficult using modern surface and interfacial characterization methods. Using copper oxide growth over copper metal, examined between RT and...
Article
Alloys and their oxides are a very important class of materials on which modern society depends. Yet, today we do not have an adequate fundamental physical-chemical model of how oxides evolve on alloys under oxidizing conditions. This physical chemical understanding will effect our ability to design a wide range of materials from electronic devices...
Article
Electrochemistry of oxides is an expanding area of oxide characterization. Although, interfacial characterization techniques including surface science methods have contributes substantially to our current understanding of the processes involved in the oxidation of metals and alloys. The characterization of subsurface zones and buried interfaces sti...
Article
Multicomponent oxide films are needed to meet the increasing demands of the electronics industry. Three main methods that involve oxidation of a metallic substrate are thermal, anodic and plasma oxidation. Today we do not have an adequate fundamental physical-chemical model of how multicomponent oxides evolve on alloys under these oxidizing conditi...
Article
Mixed hydroxides of calcium, zinc, cadmium and lead have been recently identified in the high pH environments of hydrating cement. FTIR, XRD, SEM, and SPM have been used to characterize these systems. A chemical equilibrium model of the early hydration of a zinc-doped cement/water system, Na-K-Ca-Zn-H-SO4-OH-Zn(OH)2-Zn(OH)3-Zn(OH)4-H2O, has been de...
Article
Green rust (GR) is an important intermediate in oxidative transformation of ferrous phase. It contains a mixture of ferrous and ferric hydroxides that belong to a family of layered double hydroxides. Anionic and cationic species can replace their corresponding parts in the layered structure and different species can also accumulate in between the l...
Article
High-performance nickel-based nanocrystalline zinc oxide adsorbents have been prepared adjusting Ni/Zn mol ratio of 1:5 by thermal decomposition, coprecipitation and sol-gel method for selective adsorption of thiophene in liquid hydrocarbon fuels at ambient temperature and pressure. To understand the nature of reactive adsorption of thiophene (C 4H...
Article
Due to the limited clean water resources of our planet, an urgent need exists forefficient technological development to control the level of water contaminants inwastewater streams. The most effective way would be to treat wastewater efficiently forre-use. Several water treatment methods and instruments are currently available andbeing developed th...
Article
Full-text available
Iron oxide (α-phase) nanoparticles with coercivity larger than 300 Oe have been fabricated at a mild temperature by an environmentally benign method. The economic sodium chloride has been found to effectively serve as a solid spacer to disperse the iron precursor and to prevent the nanoparticles from agglomeration. Higher ratios of sodium chloride...
Chapter
IntroductionMagnetic Polymer Nanocomposite PreparationPhysicochemical Property CharacterizationMicrostructure of the Conductive Polymer NanocompositesInteraction between the Nanoparticles and the Conductive-Polymer MatrixMagnetic Properties of Conductive-Polymer NanocompositesElectron Transport in Conductive-Polymer NanocompositesGiant Magnetoresis...
Conference Paper
Helical straking is added to exhaust stacks to mitigate harmonic oscillations in conjunction with vortex shedding. A secondary aspect appears in the destabilization of airflow in its wake which may promote dispersion. This paper will examine the influence of straking on the airflow around a stack. These results will be used to infer the impact of s...
Article
Full-text available
Current–voltage (i-v) characteristics of dry poly(p-phenylenebenzobisthiazole) (PBZT) thin films are studied before and after various doping processes. Conductivity switching phenomenon is observed after doping with HCl and H2SO4 acidic solutions at different concentration levels. The conductivity is 10 folds higher in a relatively high sweeping vo...
Conference Paper
Full-text available
Copper is vital for human health in minute amounts, but rapid and excessive intake of it from drinking water can cause short-term gastrointestinal disturbance. Long-term exposure to copper higher than 1.3 ppm over many years can cause kidney and liver damage. People with Wilsons disease and children under one year of age are more sensitive to coppe...
Article
Sulfur removal from refinery streams becoming more challenging due to the stringent environmental regulations. Among several technologies, reactive adsorption is a desulfurization technique that can be applied to remove the last ppm sulfur from fuels. For this purpose, a kind of microfiber impregnated alumina supported ZnO catalysts were prepared b...
Conference Paper
Arsenic is considered as one of the toxic materials being controlled by environmental protection agencies in several developed and developing countries. It is found in the nature as constituents of the soil, minerals and also in various organic forms. It enters the air, water, and land from wind-blown dust and gets into water from runoff, leaching,...
Article
The particle size and distribution of suspensions of clays are of considerable interest to many industrial processes including oil-well drilling, environmental abatement, polymer nanocomposites, and nanoflake catalysts. Although exploration of the interactions between montmorillonite clay with water-ethanol mixtures was studied before, particle siz...
Article
Arsenic is considered as one of the toxic materials being controlled by Environmental Protection Agencies in several developed and developing countries. It is found in the nature as constituents of the soil, minerals and also in various organic forms. It enters the air, water, and land from wind-blown dust and gets into water from runoff, leaching,...
Article
Existing hydrodesulfurization technologies are not competent to reduce the sulfur content of gasoline or diesel fuel to less than 10 ppm, partly because remaining sulfur compounds in current commercial liquid fuels are thiophenic sulfur compounds which are relatively difficult to remove. Even if the severity of the reaction is increased at high H2...
Article
Layered Double Hydroxides (LDHs), such as green rust and hydrotalcites, are a group of anion-exchangeable materials containing mixed metal hydroxides similar to brucite. They have relatively weak interlayer bonding compared to cationic clays resulting excellent ability to capture inorganic anionic contaminants, such as nitrates. With the increasing...
Article
Green rust (GR) are layered Fe(II)-Fe(III) double hydroxides, having a pyroaurite-type structure consisting of positively charged hydroxide layers and hydrated ions in interlayers. This special feature of GR is very efficient for wastewater treatment as the pollutants are easily taken in or exchanged with the anions in the interlayers. It can be si...
Article
Electrocoagulation (EC) of Orange II dye in a flow through cell with aluminum as sacrificial electrodes was carried out under varying conditions of dye concentration, current density, flow rate, conductivity, and the initial pH of the solution in order to optimize the operating parameters for maximum benefits. Maximum removal efficiency of 94.5% wa...
Article
The manufacturing of pure polyacrylonitrile (PAN) fibers and magnetic PAN/Fe3O4 nanocomposite fibers is explored by an electrospinning process. A uniform, bead-free fiber production process is developed by optimizing electrospinning conditions: polymer concentration, applied electric voltage, feedrate, and distance between needle tip to collector....
Article
Electrocoagulation (EC) has been known for more than a century. Applications in industries such as water and wastewater treatment processes have been adapted for the removal of metals, nonmetals, suspended solids, organic compounds, COD (chemical oxygen demand), and BOD (biological oxygen demand). Iron electrodes have been preferred over aluminum d...
Article
Produced water (PW) is salty water trapped in the reservoir rock and brought up along with oil or gas during production. It subsists under high pressures and temperatures, and usually contains hydrocarbons and metals. Therefore, it must be treated before being discharged to surface water. Different techniques are being used to treat PW through phas...
Article
Study of surface and subsurface interfacial chemistry of metallic and similar systems has its enormous technological importance. Copper, for example, is a common component of many alloys and bulk amorphous systems. It is being increasingly studied today because of its use for electronic interconnect systems where processing is done below 200 °C. Si...
Article
The chemical environment of barium in Portland cement which is doped with barium nitrate was investigated using x‐ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared spectroscopy (FTIR). The barium doped cement showed tremendous increases in carbonate content over the undoped cement. An XPS sulfate signal was observed in the cement...
Article
Full-text available
Cadmium (Cd) is an extremely toxic metal commonly found in industrial workplaces. Major industrial releases of Cd are due to waste streams and leaching of landfills, and from a variety of operations that involve Cd or zinc. Particularly, Cd can be released to drinking water from the corrosion of some galvanized plumbing and water main pipe material...
Conference Paper
Full-text available
The ready availability and cheapness of azo compounds have increased their use as intermediary products in organic synthesis. In addition, they are widely applied in dye and pharmaceutical industries. However, they have been found to be toxic and in some cases mutagenic. Due to the large degree of aromatics present in azo dye molecules and their bi...
Article
Lead has long been an USEPA priority pollutant and an important environmental and health concern because of its toxicity at ppb levels. In light of health and exposure data for lead, the EPA has set standards for Maximum Contaminant Level (MCL) and a MCL Goal (MCLG) as 15 ppb and 0 ppb, respectively. An accurate and rapid measurement of lead in the...
Article
Full-text available
Electrocoagulation (EC) has been known for more than a century. Applications in industries as a water and wastewater treatment process have been adapted for the removal of metals, non metals, suspended solids, organic compounds, COD and BOD. Iron electrodes have been preferred over aluminum due to their durability and cost. However, the electrochem...
Article
Green rusts are unstable compounds containing a mixture of ferrous and ferric hydroxides that belong to a family of minerals known as layered double hydroxides (LDH). They can be represented with the general formula [FeII(6-x) FeIIIx (OH)12] x+[Ax/n-*yH2O] x-, where A is an n-valent anion mainly Cl-, CO3-2 and SO4-2, and in which either the bivalen...
Article
The current theory of electrocoagulation has not been able to explain all the phenomena associated with the process, among others the differences in COD removal efficiency in differing wastewaters. In this paper, we discuss the facts associated with COD removal using EC and develop a mechanism to explain them. A brief description of the technology...
Article
Arsenic has long been an USEPA priority pollutant and is an important environmental concern because of its toxicity and carcinogenicity even at parts per billion levels. The combination of high toxicity and widespread occurrence has created a pressing need for effective monitoring and measurement of arsenic in soils and groundwater. Speciation of t...
Article
Combination of electrodes, such as aluminum and iron in a single electrochemical cell provide an alternative method for removal of arsenic from water by electrocoagulation. The removal process has been studied with a wide range of arsenic concentration (1-1000 ppm) at different pH (4-10). Analysis of the electrochemically generated by-products by X...
Article
In education, a popular model employed to represent the learning process is typically portrayed as a four-stage process signified by a cycle in a two-dimensional circular path. This cycle can be repeated by revisiting topics at increasing levels of sophistication in order to produce what is known as a spiral curriculum. In this presentation, a vari...
Article
Full-text available
A popular model employed to represent the learning process is typically portrayed as a four-stage process signified by a cycle in a two-dimensional circular path. This cycle can be repeated by revisiting topics at increasing levels of sophistication in order to produce what is known as a spiral curriculum. In this presentation, a variation of Kolb'...