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1 – 10 of 194Shima Nakisa, Naghi Parvini Ahmadi, Javad Moghaddam and Habib Ashassi-Sorkhabi
The composition and corrosion behaviors of recycled and virgin Pb anode were investigated in industrial zinc electrowinning solution with different methods. The purpose of…
Abstract
Purpose
The composition and corrosion behaviors of recycled and virgin Pb anode were investigated in industrial zinc electrowinning solution with different methods. The purpose of this study is the illustration of good anticorrosion activity of virgin Pb anodes compared to recycled one in industrial operation, while the compositions of both of them are the same which obtained from quantmetry method.
Design/methodology/approach
Its corrosion properties and electrocatalytic activity toward oxygen evolution reaction were appraised using potentiodynamic polarization, electrochemical impedance spectroscopy, galvanostatic polarization and ionic equilibrium methods. In addition, composition of anodes investigated with X-ray photoelectron spectroscopy (XPS) method. The surface composition of samples was studied via X-ray diffractogram (XRD).
Findings
The results indicate that the anodes display different anodic behaviors during the galvanostatic polarization. Virgin Pb anode shows a “potential reduction” about 320 mV lower than recycled Pb anode after 6 h of polarization; also, the stable potential after 72 h for virgin Pb anode is 100 mV lower than recycled Pb anode. Also, The XPS results show a trace amount of Cl in recycled anodes which cause the more corrosion activity. XRD results indicate that virgin Pb anodes have been covered by more oxides than recycled anodes after 72 h of electrowinning.
Originality/value
The treatment of corrosion behavior by virginity has not been detected by any researchers yet. Therefore, it is imperative to study the corrosion behavior and exact composition analysis of virgin and recycled Pb anodes to comprehension of them. This paper fulfills this need.
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Mihaly Varga, Tibor L. Alpár and Gabor Németh
This paper aims to analyze general waste handling in Hungarian particleboard production and give solutions based on experimental researches. During our research reuse of…
Abstract
This paper aims to analyze general waste handling in Hungarian particleboard production and give solutions based on experimental researches. During our research reuse of waste in Hungarian particleboard production was studied. A wood industrial branch, which can be considered as both a waste “producer” and a waste “re‐user”, recycler was mapped. This allowed an examination and analysis of both sides of waste handling. In the experimental work the effect of recycling dried impregnated décor paper in particleboard production was evaluated. The primary goal was to work out technologies for recycling non‐dangerous materials such as washing water, production and process waste from the cutting of boards. With these technologies general techniques for waste handling in the particleboard industry can be developed. The results of the experiments with impregnated paper showed that by adding crushed impregnated paper the strength of the particleboards can be increased or the same board properties can be achieved with reduced amounts of applied adhesive (UF). Based on this case study the waste handling in Hungarian particleboard companies can be worked out. More experimental researches should be made to give solutions on every waste handling needs. Solutions and advices for the particleboard industry to work in an environmental friendly and economical way are practical implications of the research. This paper was created based on a case study and researches at the University of West Hungary and Hungarian particleboard companies.
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Anders S.G. Andrae, Norihiro Itsubo and Atsushi Inaba
Using two different conceptual approaches to environmental life‐cycle assessment, attributional and consequential, the purpose was to test the hypothesis that a typical…
Abstract
Purpose
Using two different conceptual approaches to environmental life‐cycle assessment, attributional and consequential, the purpose was to test the hypothesis that a typical lead free solder paste Sn95.5Ag3.8Cu0.7 is worse than Sn63Pb37 as far as global environmental impacts are concerned.
Design/methodology/approach
Single index weighting indices within the impact methodology Life cycle Impact Assessment Method based on Endpoint Modelling (LIME) impact methodology, were applied to the flows of three life cycle inventory models and their globally related flows. The LIME results based on three environmental impact categories, i.e. resource consumption, global warming and ozonelayer depletion are presented and discussed.
Findings
The attributional LCA (ALCA) results point towards a larger impact for Sn95.5Ag3.8Cu0.7 than Sn63Pb37 mostly due to the higher Sn and Ag content. This study confirms earlier similar ALCAs. The system expansion for the Consequential LCA (CLCA) did not change this conclusion.
Research limitations/implications
The present study has not included the affected microelectronics packaging parts of electronic products, nor has it included toxic effects as they are local. ALCA was considered to be equal to CLCA for Sn95.5Ag3.8Cu0.7, where no Ag nor Sn recycling was included.
Originality/value
For the first time a global environmental impact assessment of the shift to Pb‐free solder paste using the LIME weighting method applied to a CLCA is reported. Environmental life‐cycle investigations intended to support decisions of an ecological nature in the microelectronics packaging industry should benefit from the consequential approach.
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This report, presented as the keynote paper at Surface Mount International, is the culmination of joint efforts to assess the use of lead in electronics assembly. The…
Abstract
This report, presented as the keynote paper at Surface Mount International, is the culmination of joint efforts to assess the use of lead in electronics assembly. The study, which will be presented in two parts, involved the collaboration of the following participants: B. R. Allenby and J. P. Ciccarelli, AT&T, Basking Ridge, New Jersey; I. Artaki, J. R. Fisher and D. Schoenthaler, AT&T Bell Laboratories, ERC, Princeton, New Jersey; T. A. Carroll, Hughes, El Segundo, California; D. W. Dahringer, Y. Degani, R. S. Freund, T. E. Graedel, A. M. Lyons and J. T. Plewes, AT&T Bell Laboratories, Murray Hill, New Jersey; C. Gherman and H. Solomon, GE Aerospace, Philadelphia, Pennsylvania; C. Melton, Motorola Inc., Schaumburg, Illinois; G. C. Munie, AT&T Bell Laboratories, Indian Hill, Naperville, Illinois; and N. Socolowski, Alpha Metals, Jersey City, New Jersey.
Pierandrea Dal Fabbro, Andrea La Gala, Willem Van De Steene, Dagmar R. D’hooge, Giovanni Lucchetta, Ludwig Cardon and Rudinei Fiorio
This study aims to evaluate and compare the macroscopic properties of commercial acrylonitrile-butadiene-styrene (ABS) processed by two different types of additive…
Abstract
Purpose
This study aims to evaluate and compare the macroscopic properties of commercial acrylonitrile-butadiene-styrene (ABS) processed by two different types of additive manufacturing (AM) machines. The focus is also on the effect of multiple closed-loop recycling of ABS.
Design/methodology/approach
A conventional direct-drive, Cartesian-type machine and a Bowden, Delta-type machine with an infrared radiant heating system are used to manufacture test specimens molded in ABS. Afterward, multiple closed-loop recycling cycles are conducted, involving consecutive AM (four times) and recycling (three times). The rheological, mechanical, morphological and physicochemical properties are investigated.
Findings
The type of machine affects the quality of the produced parts. The machine containing an infrared radiant system in a temperature-controlled chamber produces parts showing higher mechanical properties and filling fraction, although it increases the yellowing. Closed-loop recycling of ABS for AM is applicable for at least two cycles, inducing a slight increase in tensile modulus (ca. 5%) and in tensile strength (ca. 13%) and a decrease in the impact strength (ca. 14%) and melt viscosity. An increase in the filling fraction of the AM parts promotes an increase in tensile strength and tensile modulus, although it does not influence the impact strength. Furthermore, multiple closed-loop recycling does not affect the overall chemical structure of ABS.
Practical implications
Controlling the environmental temperature and using infrared radiant heating during AM of ABS improves the quality of the produced parts. Closed-loop recycling of ABS used in AM is feasible up to at least two recycling steps, supporting the implementation of a circular economy for polymer-based AM.
Originality/value
This study shows original results regarding the assessment of the effect of different types of AM machines on the main end-use properties of ABS parts and the influence of multiple closed-loop recycling on the characteristics of ABS fabricated by the most suited AM machine with an infrared radiant heating system and a temperature-controlled environment.
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Suae‐chen Chang and Ronald L. Shubkin
Precision cleaning with solvent systems based on n‐propyl bromide (nPB) has become an important component of the circuit board fabrication process. The nPB‐based cleaners…
Abstract
Precision cleaning with solvent systems based on n‐propyl bromide (nPB) has become an important component of the circuit board fabrication process. The nPB‐based cleaners have proved themselves valuable alternatives to the once popular chlorocarbons and hydrochlorocarbons. These latter solvents have been largely banned or restricted because of toxicological and/or environmental considerations. n‐propyl bromide has nearly identical physical and cleaning properties to 1,1,1‐trichloroethane (1,1,1‐T or TCA), but it has a low Ozone Depletion Potential (ODP) and a low Global Warming Potential (GWP). A growing body of evidence shows that nPB‐based solvents are safe, effective and cost‐efficient alternatives for precision cleaning applications. New formulations have now been developed specifically for the electronics industry. The first challenge is the efficient removal of ionic residues left by certain types of solder flux. The second challenge is the prevention of tarnish on silver leads used on some circuit boards. Case histories and a discussion of relevant toxicological, environmental and regulatory considerations will be included.
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Documents can now be produced, reproduced and refined so effortlessly that the electronic office has actually resulted in an increase in the use of paper — paper that…
Abstract
Documents can now be produced, reproduced and refined so effortlessly that the electronic office has actually resulted in an increase in the use of paper — paper that costs offices money to buy and money to dispose of. Of the thousands of tonnes of paper thrown away each year, it has been estimated that 130 000 tonnes could be economically recovered and recycled. Besides recycling there are other measures to be considered — avoiding waste by using each piece of paper fully before discarding it; restricting the number of copies made of a document, — which may be applicable to particular offices. Here we are looking at the two faces of recycling: the salvage of paper to be sold to be reprocessed into ‘recycled’ paper, and the purchase of the recycled paper to use in place of ‘virgin’ paper. Virgin paper is made from trees either chemically pulped, when it is known as ‘wood free’ or mechanically pulped.
Reginald Harris and Byron Bartlett
Poets House, a poetry special collection in New York, hosts an annual exhibit of the preceding year's poetry publications in the USA. This paper aims to offer a selection…
Abstract
Purpose
Poets House, a poetry special collection in New York, hosts an annual exhibit of the preceding year's poetry publications in the USA. This paper aims to offer a selection of recommended titles that reflect the range of poetry titles including single‐author works, anthologies, and prose about poetry.
Design/methodology/approach
The paper researched and requested donations of 2010‐2011 poetry titles from US poetry publishers to assemble and display a comprehensive collection of poetry publications, from which a selection of 50 titles was made. The selections should appeal to a range of poetry readers, from novices and students to poets looking to access the latest work from their peers.
Findings
Over 2,500 poetry titles were published and/or available to readers in the USA between June 2010 and June 2011. These titles range from mainstream publishers to independent presses to artists' collectives publishing works from established poets as well as emerging and international poets.
Research limitations/implications
Without a budget for collection development, the exhibit and resulting titles represent those which publishers have opted to donate to the library. Every effort is made to be all‐inclusive, with the understanding that publishers may send only a selection of their list. The selected titles herein are based on the titles received for the exhibition.
Practical implications
For 19 years Poets House's annual Showcase has been the main collection‐development tool. Publishers donate copies of their titles, which are arranged by publisher for a month‐long exhibition. This approach enriches the poetry special collection, a unique poetry library built on community participation. The all‐inclusive collection‐development approach results in a full representation of poetry publishing.
Originality/value
A selection made from a comprehensive collection of the year's poetry titles offers a sample of poetry publishing from large to small presses and the self‐published in the USA.
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Richa Chaudhary and Samrat Bisai
Building on the theory of planned behavior (TPB), the purpose of this paper is to understand the green buying behavior of educated millennials in India. The study also…
Abstract
Purpose
Building on the theory of planned behavior (TPB), the purpose of this paper is to understand the green buying behavior of educated millennials in India. The study also attempts to extend the TPB by including two additional variables, environmental concern (EC) and willingness to pay premium, in the framework.
Design/methodology/approach
Data were collected from 202 students from various departments of an institute of higher education in India. The proposed model was tested with the help of structural equation modeling using bootstrapping procedures in SPSS AMOS 24.
Findings
Except for the direct association between subjective norm (SN) and purchase intention (PI), the study provided support for the TPB framework. EC was found to exert an indirect influence on green PI through its effect on attitude, SN and perceived behavioral control. Willingness to pay premium moderated the relationship of PI with green buying behavior. PIs were found to successfully translate into purchase behavior (PB).
Practical implications
This research by promoting an understanding on the factors affecting the green buying behavior of educated millennials in India will assist green marketers to tap the tremendous potential inherent in this market segment by formulating customized market plans and strategies.
Originality/value
The study extends the existing literature by validating and extending the TPB framework in a unique cultural context and advancing the understanding of underlying psychological mechanisms and boundary conditions of the relationship between PIs and PBs.
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Nilisha Itankar, Yogesh Patil, Prakash Rao and Viraja Bhat
Heavy metals play a crucial role in the economic development of any nation. Industries utilizing heavy metals, consequently, emanate a large volume of metal-containing…
Abstract
Heavy metals play a crucial role in the economic development of any nation. Industries utilizing heavy metals, consequently, emanate a large volume of metal-containing liquid effluents. Since metals are non-renewable and finite resources, their judicious and sustainable use is the key. Hazardous metal-laden water poses threat to human health and ecology. Apart from metals, these industrial effluents also consist of toxic chemicals. Conventional physical–chemical techniques are not efficient enough as it consumes energy and are, therefore, not cost effective.
It is known that biomaterials namely microorganisms, plants, and agricultural biomass have the competence to bind metals, in some cases, selectively, from aqueous medium. This phenomenon is termed as “metal biosorption.” Biosorption has immense potential of becoming an effective alternative over conventional methods. The authors in the present chapter have used secondary data from their previous research work and attempted to develop few strategic models through their feasibility studies for metal sustainability.
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