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Thakur P, Kumar S. Augmentation in bioleaching potential of indigenous Bacillus sp. ISO1 for metals recovery from waste computer-printed circuit boards. Int Microbiol 2024; 27:845-855. [PMID: 37831318 DOI: 10.1007/s10123-023-00434-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 08/23/2023] [Accepted: 09/26/2023] [Indexed: 10/14/2023]
Abstract
The bio-cyanidation process of various cyanogenic microorganisms is found to be a sustainable and effective method for metals recovery from primary and secondary sources. This process has surpassed the limitations of the chemical cyanide treatment process; thus, prioritized as a promising approach for e-waste "urban mining" strategies. The main focus of the study was to enhance the bioleaching capacity of indigenous Bacillus sp. ISO1 and to implement optimized parameters in large-scale bioleaching operations. The assessment of various amino acids unveiled that like other cyanogenic microorganisms Bacillus sp. ISO1 also preferred glycine as a prime precursor for cyanide synthesis, as maximum metal solubilization was achieved with glycine amino acid. Other amino acids influenced the bacterial growth but not significantly affected the biocyanidation process. The evaluation and optimization of methionine as a lixiviant stimulator demonstrated that the addition of 1 mg/L methionine effectively enhance the production of glycine-utilizing cyanide lixiviant, that led to a significant solubilization of Cu (86%), Au (75%), and Ag (63%) metals. Furthermore, the kinetics of metal solubilization and operating conditions were explored at increased volume (i.e., 3 L working volume) of bioleaching medium to assess the industrial scale potential of this potent bacterial strain with optimized parameters such as temperature, pH, pulp density, and inoculum size. The significant recovery of Cu (˃ 60%) and other metals at this substantial volume suggested the implementation of a bioleaching process with this potent bacterial strain at industrial scale operations.
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Affiliation(s)
- Pooja Thakur
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology, Waknaghat, Solan, Himachal Pradesh, 173234, India
| | - Sudhir Kumar
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology, Waknaghat, Solan, Himachal Pradesh, 173234, India.
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2
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Karimi Darvanjooghi MH, Magdouli S, Brar SK. Recent challenges in biological cyanidation and oxidation of sulfide-based refractory gold ore. World J Microbiol Biotechnol 2024; 40:67. [PMID: 38197973 DOI: 10.1007/s11274-024-03887-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 01/07/2024] [Indexed: 01/11/2024]
Abstract
In mining industries, biomining (comprising biooxidation and bioleaching) is implemented to extract metals from specific ores and waste streams with less environmental effect and expense. Usually, micron-sized gold particles are held in a crystal lattice of iron sulfide minerals and expensively extracted using common approaches. Researchers and industries are interested in developing recent technology and biologically sustainable methods in both pretreatment and further extraction steps for extracting this valuable metal from ores. Diverse studies in biooxidation, as a conventional pretreatment, and biocyanidation, as a new proposed biotechnological method in the downstream gold extraction step, have addressed scientific and technological issues in the extraction of this metal. These two methods have become economically practical by merging high-throughput microbiological data, extraction and recovery process knowledge, and theory validation. However, there is still a gap in the implementation of both the pretreatment method and extraction method due to the consistency and their compatibility with operational recovery conditions. This review brings out the recent biooxidation and biocyanidation improvements, innovation, industry and academic research, and obstacles to gold extraction with a brief explanation to address the recent developments.
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Affiliation(s)
| | - Sara Magdouli
- Department of Civil Engineering, Lassonde School of Engineering, York University, Toronto, ON, M3J 1P3, Canada
| | - Satinder Kaur Brar
- Department of Civil Engineering, Lassonde School of Engineering, York University, Toronto, ON, M3J 1P3, Canada.
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Bharathi SD, Dilshani A, Rishivanthi S, Khaitan P, Vamsidhar A, Jacob S. Resource Recycling, Recovery, and Xenobiotic Remediation from E-wastes Through Biofilm Technology: A Review. Appl Biochem Biotechnol 2023; 195:5669-5692. [PMID: 35796946 DOI: 10.1007/s12010-022-04055-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/26/2022] [Indexed: 11/02/2022]
Abstract
Around 50 million tonnes of electronic waste has been generated globally per year, causing an environmental hazard and negative effects on human health, such as infertility and thyroid disorders in adults, endocrine and neurological damage in both animals and humans, and impaired mental and physical development in children. Out of that, only 15% is recycled each year and the remaining is disposed of in a landfill, illegally traded or burned, and treated in a sub-standard way. The processes of recycling are challenged by the presence of brominated flame retardants. The different recycling technologies such as the chemical and mechanical methods have been well studied, while the most promising approach is the biological method. The process of utilizing microbes to decontaminate and degrade a wide range of pollutants into harmless products is known as bioremediation and it is an eco-friendly, cost-effective, and sustainable method. The bioremediation process is significantly aided by biofilm communities attached to electronic waste because they promote substrate bioavailability, metabolite transfer, and cell viability, all of which accelerate bioleaching and biodegradation. Microbes existing in biofilm mode relatable to free-floating planktonic cells are advantageous of bioremediation due to their tolerant ability to environmental stress and pollutants through diverse catabolic pathways. This article discusses the harmful effects of electronic waste and its management using biological strategies especially biofilm-forming communities for resource recovery.
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Affiliation(s)
- Sundaram Deepika Bharathi
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Chengalpattu Dist., 603203, Tamil Nadu, India
| | - Aswin Dilshani
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Chengalpattu Dist., 603203, Tamil Nadu, India
| | - Srinivasan Rishivanthi
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Chengalpattu Dist., 603203, Tamil Nadu, India
| | - Pratham Khaitan
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Chengalpattu Dist., 603203, Tamil Nadu, India
| | - Adhinarayan Vamsidhar
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Chengalpattu Dist., 603203, Tamil Nadu, India
| | - Samuel Jacob
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Chengalpattu Dist., 603203, Tamil Nadu, India.
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Li S, Ali S, Zuhra Z, Abbas Y, Xie G, Wang X, Ding S. Turning precious metal-loaded e-waste to useful catalysts: Investigation into supercilious recovery and catalyst viability for peroxymonosulfate activation. CHEMOSPHERE 2023:139170. [PMID: 37307931 DOI: 10.1016/j.chemosphere.2023.139170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 05/15/2023] [Accepted: 06/07/2023] [Indexed: 06/14/2023]
Abstract
Here, the key tasks to be accomplished are selective precious metal recovery from e-wastewater and their conversion into valuable catalysts for peroxymonosulfate (PMS) activation. In this regard, we developed a hybrid material using 3D functional graphene foam and copper para-phenylenedithol (Cu-pPDT) MOF. The prepared hybrid showed a supercilious recovery of 92-95% even up to five cycles for Au(III) and Pd(II), which can be viewed as a reference for both the 2D graphene and the MOFs family. The outstanding performance has been attributed principally to the impact of diverse functionality as well as the unique morphology of 3D graphene foam, which provided a wide range of surface area and additional active sites in the hybrid frameworks. To prepare the surface-loaded metal nanoparticle catalysts, the sorbed samples recovered after precious metal extraction were calcined at 800 °C. The viability of the developed catalysts for the breakdown of 4-nitrophenol (4-NP) via PMS activation was investigated. Electron paramagnetic resonance spectroscopy (EPR) and experiments with radical scavengers suggest that sulfate and hydroxyl radicals are the main reactive species involved in the breakdown of 4-NP. This is because the active graphitic carbon matrix and the exposed precious metal and copper active sites work together in a way that is more effective.
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Affiliation(s)
- Shuo Li
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, 523808, China; Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, School of Chemistry, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Shafqat Ali
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Zareen Zuhra
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Yasir Abbas
- Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Guanqun Xie
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China.
| | - Xiaoxia Wang
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, 523808, China.
| | - Shujiang Ding
- Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, School of Chemistry, Xi'an Jiaotong University, Xi'an, 710049, China
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Kölbl D, Memic A, Schnideritsch H, Wohlmuth D, Klösch G, Albu M, Giester G, Bujdoš M, Milojevic T. Thermoacidophilic Bioleaching of Industrial Metallic Steel Waste Product. Front Microbiol 2022; 13:864411. [PMID: 35495675 PMCID: PMC9043896 DOI: 10.3389/fmicb.2022.864411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 03/14/2022] [Indexed: 11/13/2022] Open
Abstract
The continuous deposition of hazardous metalliferous wastes derived from industrial steelmaking processes will lead to space shortages while valuable raw metals are being depleted. Currently, these landfilled waste products pose a rich resource for microbial thermoacidophilic bioleaching processes. Six thermoacidophilic archaea (Sulfolobus metallicus, Sulfolobus acidocaldarius, Metallosphaera hakonensis, Metallosphaera sedula, Acidianus brierleyi, and Acidianus manzaensis) were cultivated on metal waste product derived from a steelmaking process to assess microbial proliferation and bioleaching potential. While all six strains were capable of growth and bioleaching of different elements, A. manzaensis outperformed other strains and its bioleaching potential was further studied in detail. The ability of A. manzaensis cells to break down and solubilize the mineral matrix of the metal waste product was observed via scanning and transmission electron microscopy. Refinement of bioleaching operation parameters shows that changes in pH influence the solubilization of certain elements, which might be considered for element-specific solubilization processes. Slight temperature shifts did not influence the release of metals from the metal waste product, but an increase in dust load in the bioreactors leads to increased element solubilization. The formation of gypsum crystals in course of A. manzaensis cultivation on dust was observed and clarified using single-crystal X-ray diffraction analysis. The results obtained from this study highlight the importance of thermoacidophilic archaea for future small-scale as well as large-scale bioleaching operations and metal recycling processes in regard to circular economies and waste management. A thorough understanding of the bioleaching performance of thermoacidophilic archaea facilitates further environmental biotechnological advancements.
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Affiliation(s)
- Denise Kölbl
- Extremophiles/Space Biochemistry Group, Department of Biophysical Chemistry, University of Vienna, Vienna, Austria
| | - Alma Memic
- Extremophiles/Space Biochemistry Group, Department of Biophysical Chemistry, University of Vienna, Vienna, Austria
| | | | | | | | - Mihaela Albu
- Graz Centre for Electron Microscopy, Graz, Austria
| | - Gerald Giester
- Department of Mineralogy and Crystallography, University of Vienna, Vienna, Austria
| | - Marek Bujdoš
- Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
| | - Tetyana Milojevic
- Extremophiles/Space Biochemistry Group, Department of Biophysical Chemistry, University of Vienna, Vienna, Austria
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6
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Yaashikaa PR, Priyanka B, Senthil Kumar P, Karishma S, Jeevanantham S, Indraganti S. A review on recent advancements in recovery of valuable and toxic metals from e-waste using bioleaching approach. CHEMOSPHERE 2022; 287:132230. [PMID: 34826922 DOI: 10.1016/j.chemosphere.2021.132230] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 08/30/2021] [Accepted: 09/08/2021] [Indexed: 05/15/2023]
Abstract
This review is intent on the environmental pollution generated from printed circuit boards and the methods employed to retrieve valuable and hazardous metals present in the e-wastes. Printed circuit boards are the key components in the electronic devices and considered as huge e-pollutants in polluting our surroundings and the environment as a whole. Composing of toxic heavy metals, it causes serious health effects to the plants, animals and humans in the environment. A number of chemical, biological and physical approaches were carried out to recover the precious metals and to remove the hazardous metals from the environment. Chemical leaching is one of the conventional PCBs recycling methods which was carried out by using different organic solvents and chemicals. Need of high cost for execution, generation of secondary wastes in the conventional methods, forces to discover the advanced recycling methods such as hydrometallurgical, bio-metallurgical and bioleaching processes to retrieve the valuable metals generate through e-wastes. Among them, bioleaching process gain extra priority due to its higher efficiency of metal recovery from printed circuit boards. There are different classes of microorganisms have been utilized for precious metal recovery from the PCBs through bioleaching process such as chemolithoautotrophy, heterotrophy and different fungal species including Aspergillus sp. and Penicillium sp. The current status and scope for further studies in printed circuit boards recycling are discussed in this review.
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Affiliation(s)
- P R Yaashikaa
- Department of Biotechnology, Saveetha School of Engineering, SIMATS, Chennai, 602105, India
| | - B Priyanka
- Department of Biotechnology, Saveetha School of Engineering, SIMATS, Chennai, 602105, India
| | - P Senthil Kumar
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, India.
| | - S Karishma
- Department of Biotechnology, Rajalakshmi Engineering College, Chennai, 602105, India
| | - S Jeevanantham
- Department of Biotechnology, Rajalakshmi Engineering College, Chennai, 602105, India
| | - Sravya Indraganti
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, India
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7
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Bioleaching of metals from waste printed circuit boards using bacterial isolates native to abandoned gold mine. Biometals 2021; 34:1043-1058. [PMID: 34213670 DOI: 10.1007/s10534-021-00326-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 06/21/2021] [Indexed: 10/21/2022]
Abstract
In the present study, native bacterial strains isolated from abandoned gold mine and Chromobacterium violaceum (MTCC-2656) were applied for bioleaching of metals from waste printed circuit boards (WPCBs). Toxicity assessment and dose-response analysis of WPCBs showed EC50 values of 128.9, 98.7, and 90.8 g/L for Bacillus sp. SAG3, Bacillus megaterium SAG1 and Lysinibacillus sphaericus SAG2, respectively, whereas, for C. violaceum EC50 was 83.70 g/L. This indicates the viable operation range and technological feasibility of metals bioleaching from WPCBs using mine isolates. The influencing factors such as pH, pulp density, temperature, and precursor molecule (glycine) were optimized by one-factor at a time method (OFAT). The maximum metal recovery occurred at an initial pH of 9.0, a pulp density of 10 g/L, a temperature of 30 °C and a glycine concentration of 5 g/L, except for L. sphaericus which showed optimum activity at initial pH of 8.0. Under optimal conditions the metals recovery of Cu and Au from WPCBs were recorded as 87.5 ± 8% and 73.6 ± 3% for C. violaceum and 72.7 ± 5% and 66.6 ± 6% for B. megaterium, respectively. Kinetic modeling results showed that the data was best described by first order reaction kinetics, where the rate of metal solubilization from WPCBs depended upon microbial lixiviant production. This is the first report on bioleaching of metals from e-waste using bacterial isolates from the gold mine of Solan, HP. Our study demonstrated the potential of bioleaching for resource recovery from WPCBs dust, aimed to be disposed at landfills, and its effectiveness in extraction of elements those are at high supply risk and demand.
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Rana S, Mishra P, Wahid ZA, Thakur S, Pant D, Singh L. Microbe-mediated sustainable bio-recovery of gold from low-grade precious solid waste: A microbiological overview. J Environ Sci (China) 2020; 89:47-64. [PMID: 31892401 DOI: 10.1016/j.jes.2019.09.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 09/24/2019] [Accepted: 09/25/2019] [Indexed: 06/10/2023]
Abstract
In an era of electronics, recovering the precious metal such as gold from ever increasing piles of electronic-wastes and metal-ion infested soil has become one of the prime concerns for researchers worldwide. Biological mining is an attractive, economical and non-hazardous to recover gold from the low-grade auriferous ore containing waste or soil. This review represents the recent major biological gold retrieval methods used to bio-mine gold. The biomining methods discussed in this review include, bioleaching, bio-oxidation, bio-precipitation, bio-flotation, bio-flocculation, bio-sorption, bio-reduction, bio-electrometallurgical technologies and bioaccumulation. The mechanism of gold biorecovery by microbes is explained in detail to explore its intracellular mechanistic, which help it withstand high concentrations of gold without causing any fatal consequences. Major challenges and future opportunities associated with each method and how they will dictate the fate of gold bio-metallurgy from metal wastes or metal infested soil bioremediation in the coming future are also discussed. With the help of concurrent advancements in high-throughput technologies, the gold bio-exploratory methods will speed up our ways to ensure maximum gold retrieval out of such low-grade ores containing sources, while keeping the gold mining clean and more sustainable.
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Affiliation(s)
- Supriyanka Rana
- Faculty of Civil Engineering Technology, Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia
| | - Puranjan Mishra
- Faculty of Civil Engineering Technology, Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia
| | - Zularisam Ab Wahid
- Faculty of Civil Engineering Technology, Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia; Earth Resources and Sustainability Center (EARS), Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia.
| | - Sveta Thakur
- Faculty of Civil Engineering Technology, Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia
| | - Deepak Pant
- Separation and Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, Mol, 2400, Belgium
| | - Lakhveer Singh
- Faculty of Civil Engineering Technology, Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia; Earth Resources and Sustainability Center (EARS), Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia.
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9
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Yuan Z, Yuan Y, Liu W, Ruan J, Li Y, Fan Y, Qiu R. Heat evolution and energy analysis of cyanide bioproduction by a cyanogenic microorganism with the potential for bioleaching of precious metals. JOURNAL OF HAZARDOUS MATERIALS 2019; 377:284-289. [PMID: 31173977 DOI: 10.1016/j.jhazmat.2019.05.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 05/20/2019] [Accepted: 05/21/2019] [Indexed: 06/09/2023]
Abstract
Precious metals were lost in the current technologies of recovering waste printed circuit boards (WPCBs). Microbe-produced cyanide is considered as an important lixiviant in bioleaching of precious metals from WPCBs. Enhancing cyanide production is the key to industrialization of bioleaching technology. This study identified the precursor form of biogenic cyanide, investigated the energy characteristics of cyanide synthesis, thermal change characteristics of cyanogenic culture, and the potential kinetic relationship between cyanide production and thermal change. We firstly found glycine anion [H2NCH2CO2]- was the precursor form of cyanide in microbial biocatalysis. The bond cleavage pathways from glycine anion to cyanide were analyzed by computation chemical. Results showed decomposition of glycine anion into cyanide was endothermic and non-spontaneous. Formations of [HN = CHCO2]- and -C≡N have an average energy barrier of 34.05 and 9.15 kcal/mol respectively, while formations of free radicals from anionic intermediates have an average barrier of 71.05 kcal/mol. Cyanide concentration began to increase from 0.48 to 5.27 mg/L when heat production was strongest. Temperature difference between sterile medium and cyanogenic culture reached 0.3 °C. Therefore, metabolic heat brought positive effect on cyanide biosynthesis.
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Affiliation(s)
- Zhihui Yuan
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou 510275, People's Republic of China
| | - Yongqiang Yuan
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou 510275, People's Republic of China
| | - Weiqi Liu
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou 510275, People's Republic of China
| | - Jujun Ruan
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou 510275, People's Republic of China.
| | - Yaying Li
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou 510275, People's Republic of China
| | - Yaxin Fan
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou 510275, People's Republic of China
| | - Rongliang Qiu
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou 510275, People's Republic of China
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10
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Yuan Z, Ruan J, Li Y, Qiu R. A new model for simulating microbial cyanide production and optimizing the medium parameters for recovering precious metals from waste printed circuit boards. JOURNAL OF HAZARDOUS MATERIALS 2018; 353:135-141. [PMID: 29660699 DOI: 10.1016/j.jhazmat.2018.04.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 04/03/2018] [Accepted: 04/04/2018] [Indexed: 06/08/2023]
Abstract
Bioleaching is a green recycling technology for recovering precious metals from waste printed circuit boards (WPCBs). However, this technology requires increasing cyanide production to obtain desirable recovery efficiency. Luria-Bertani medium (LB medium, containing tryptone 10 g/L, yeast extract 5 g/L, NaCl 10 g/L) was commonly used in bioleaching of precious metal. In this study, results showed that LB medium did not produce highest yield of cyanide. Under optimal culture conditions (25 °C, pH 7.5), the maximum cyanide yield of the optimized medium (containing tryptone 6 g/L and yeast extract 5 g/L) was 1.5 times as high as that of LB medium. In addition, kinetics and relationship of cell growth and cyanide production was studied. Data of cell growth fitted logistics model well. Allometric model was demonstrated effective in describing relationship between cell growth and cyanide production. By inserting logistics equation into allometric equation, we got a novel hybrid equation containing five parameters. Kinetic data for cyanide production were well fitted to the new model. Model parameters reflected both cell growth and cyanide production process.
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Affiliation(s)
- Zhihui Yuan
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China
| | - Jujun Ruan
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China.
| | - Yaying Li
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China
| | - Rongliang Qiu
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China.
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Wei W, Li Y, Yang H, Nassab R, Shahriyari F, Akpek A, Guan X, Liu Y, Taranejoo S, Tamayol A, Zhang YS, Khademhosseini A, Jang HL. 3D Printed Anchoring Sutures for Permanent Shaping of Tissues. Macromol Biosci 2017; 17:10.1002/mabi.201700304. [PMID: 29144584 PMCID: PMC5932114 DOI: 10.1002/mabi.201700304] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 10/06/2017] [Indexed: 11/06/2022]
Abstract
Sutures are one of the most widely used devices for adhering separated tissues after injury or surgery. However, most sutures require knotting, which can create a risk of inflammation, and can act as mechanically weak points that often result in breakage and slipping. Here, an anchoring suture is presented with a design that facilitates its propagation parallel to the suturing direction, while maximizing its resistive force against the opposite direction of external force to lock its position in tissues. Different microstructures of suture anchors are systematically designed using orthogonal arrays, and selected based on shape factors associated with mechanical strength. 3D printing is used to fabricate different types of hollow microstructured suture anchors, and optimize their structure for the effective shaping of tissues. To define the structural design for fixing tissues, the maximum force required to pull 3D printed anchors in different directions is examined with tissues. The tissue reshaping function of suture anchors is further simulated ex vivo by using swine ear, nose, and skin, and bovine muscle tendon. This study provides advantages for building functional sutures that can be used for permanently reshaping tissues with enhanced mechanical strength, eliminating the need for knotting to improve surgical efficiency.
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Affiliation(s)
- Wei Wei
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Yuxiao Li
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Huazhe Yang
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Reza Nassab
- The Wilmslow Hospital, Wilmslow, Cheshire, SK9 1NY GB, UK
| | - Fatemeh Shahriyari
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Ali Akpek
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Xiaofei Guan
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Yanhui Liu
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Shahrouz Taranejoo
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Ali Tamayol
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - Yu Shrike Zhang
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - Ali Khademhosseini
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
- Department of Bioindustrial Technologies, College of Animal Bioscience & Technology, Konkuk University, Seoul, 143-701, Republic of Korea
- Nanotechnology Center, King Abdulaziz University, Jeddah, 21569, Saudi Arabia
| | - Hae Lin Jang
- Division of Engineering in Medicine, Department of Medicine, Biomaterials Innovation Research Center, Brigham & Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
- Division of Health Sciences & Technology, Harvard-Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
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Awasthi AK, Zlamparet GI, Zeng X, Li J. Evaluating waste printed circuit boards recycling: Opportunities and challenges, a mini review. WASTE MANAGEMENT & RESEARCH : THE JOURNAL OF THE INTERNATIONAL SOLID WASTES AND PUBLIC CLEANSING ASSOCIATION, ISWA 2017; 35:346-356. [PMID: 28097947 DOI: 10.1177/0734242x16682607] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Rapid generation of waste printed circuit boards has become a very serious issue worldwide. Numerous techniques have been developed in the last decade to resolve the pollution from waste printed circuit boards, and also recover valuable metals from the waste printed circuit boards stream on a large-scale. However, these techniques have their own certain specific drawbacks that need to be rectified properly. In this review article, these recycling technologies are evaluated based on a strength, weaknesses, opportunities and threats analysis. Furthermore, it is warranted that, the substantial research is required to improve the current technologies for waste printed circuit boards recycling in the outlook of large-scale applications.
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Affiliation(s)
- Abhishek Kumar Awasthi
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, China
| | - Gabriel Ionut Zlamparet
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, China
| | - Xianlai Zeng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, China
| | - Jinhui Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, China
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13
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Zhang X, Wang M, Li L, Yin D. A high-performance liquid chromatography-electronic circular dichroism online method for assessing the absolute enantiomeric excess and conversion ratio of asymmetric reactions. Sci Rep 2017; 7:43278. [PMID: 28252028 PMCID: PMC5333115 DOI: 10.1038/srep43278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Accepted: 01/19/2017] [Indexed: 12/02/2022] Open
Abstract
Asymmetric reactions often need to be evaluated during the synthesis of chiral compounds. However, traditional evaluation methods require the isolation of the individual enantiomer, which is tedious and time-consuming. Thus, it is desirable to develop simple, practical online detection methods. We developed a method based on high-performance liquid chromatography-electronic circular dichroism (HPLC-ECD) that simultaneously analyzes the material conversion ratio and absolute optical purity of each enantiomer. In particular, only a reverse-phase C18 column instead of a chiral column is required in our method because the ECD measurement provides a g-factor that describes the ratio of each enantiomer in the mixtures. We used our method to analyze the asymmetric hydrosilylation of β-enamino esters, and we discussed the advantage, feasibility, and effectiveness of this new methodology.
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Affiliation(s)
- Xiang Zhang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Beijing Key Laboratory of Active Substances, Discovery and Druggability Evaluation, Institute of Materia Medica, Peking Union Medical College &Chinese Academy of Medical Sciences, Beijing, China
| | - Mingchao Wang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Beijing Key Laboratory of Active Substances, Discovery and Druggability Evaluation, Institute of Materia Medica, Peking Union Medical College &Chinese Academy of Medical Sciences, Beijing, China
| | - Li Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Beijing Key Laboratory of Active Substances, Discovery and Druggability Evaluation, Institute of Materia Medica, Peking Union Medical College &Chinese Academy of Medical Sciences, Beijing, China
| | - Dali Yin
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Beijing Key Laboratory of Active Substances, Discovery and Druggability Evaluation, Institute of Materia Medica, Peking Union Medical College &Chinese Academy of Medical Sciences, Beijing, China
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14
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Awasthi AK, Zeng X, Li J. Integrated bioleaching of copper metal from waste printed circuit board-a comprehensive review of approaches and challenges. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:21141-21156. [PMID: 27678000 DOI: 10.1007/s11356-016-7529-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 08/26/2016] [Indexed: 05/24/2023]
Abstract
Waste electrical and electronic equipment (e-waste) is the most rapidly growing waste stream in the world, and the majority of the residues are openly disposed of in developing countries. Waste printed circuit boards (WPCBs) make up the major portion of e-waste, and their informal recycling can cause environmental pollution and health risks. Furthermore, the conventional disposal and recycling techniques-mechanical treatments used to recover valuable metals, including copper-are not sustainable in the long term. Chemical leaching is rapid and efficient but causes secondary pollution. Bioleaching is a promising approach, eco-friendly and economically feasible, but it is slower process. This review considers the recycling potential of microbes and suggests an integrated bioleaching approach for Cu extraction and recovery from WPCBs. The proposed recycling system should be more effective, efficient and both technically and economically feasible.
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Affiliation(s)
- Abhishek Kumar Awasthi
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Rm. 805, Sino-Italian Environment and Energy Efficient Building, Beijing, 100084, China
| | - Xianlai Zeng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Rm. 805, Sino-Italian Environment and Energy Efficient Building, Beijing, 100084, China
| | - Jinhui Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Rm. 805, Sino-Italian Environment and Energy Efficient Building, Beijing, 100084, China.
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