A Content Review of Life Cycle Assessment of Nanomaterials: Current Practices, Challenges, and Future Prospects
Abstract
:Highlights
- A total of 71 studies on life cycle assessment of nanomaterials application were reviewed.
- Environmental performance and hotspot of nanomaterials were identified.
- Challenges and prospects for life cycle assessment of nanomaterials were discussed.
- Only five studies considered the exposure pathway of the nanomaterials.
- Of all the studies, 92% neglect the uncertainty analysis within the LCA.
1. Introduction
2. Life Cycle Assessment of Nanomaterials
2.1. Inclusion of Existing LCA Studies
2.2. Research Subject and Geographical Distribution of LCA Studies
2.2.1. Functional Unit (FU)
2.2.2. System Boundaries
2.3. Life Cycle Inventory (LCI)
2.4. Life Cycle Impact Assessment (LCIA)
2.4.1. Fate Factor (FF)
2.4.2. Exposure Factor (XF)
2.4.3. Effect Factor (EF)
2.5. Interpretation
2.6. Advantages of Life Cycle Assessment Study
3. Limitations and Uncertainties in LCA Study
3.1. Limitation of Current LCA Studies on Nanomaterials
3.2. Uncertainty of LCA for Nanomaterials
4. Recommendations and Future Prospect of LCA for Nanomaterials
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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No. | Reference | Type of Nanomaterials | Method/Software | Impact Categories | System Boundaries | Functional Unit | Impact Assessment | |
---|---|---|---|---|---|---|---|---|
Mid-Point | Endpoint | |||||||
1. | [26] | Nanocrystalline | Ecoindicator 95, Environmental Priority Strategies (EPS), Eco Sweden, Eco Netherlands and Environmental Design of Industrial Products (EDIP)/SimaPro | Greenhouse gases (GHG) emissions, air emissions, electricity generation | Cradle-to-grave | 1 kWh electricity | O | O |
2. | [27] | Nanoclay polymer composites | Economic Input-Output Life Cycle Assessment (EIO-LCA) through Economic Input-Output (EIO) model/GaBi 4 | Projected fuel savings, Carbon Dioxide (CO2) reduction, economic inputs and outputs, GHG emissions, toxic releases | Cradle-to-grave | 16.9 million light-duty vehicles, 210 million vehicles on the road | O | O |
3. | [28] | Nanoscale platinum-group metal particles | EIO-LCA through EIO model/GaBi 4 | Economic inputs and outputs, economic purchases, emissions of conventional pollutants and greenhouse gases, RCRA hazardous waste, toxic releases | Cradle-to-gate | Projected motor vehicles in the US between 2005 and 2030 | O | O |
4. | [29] | Various oxide nanoparticles | Not stated - Ecoinvent | Energy consumption, CO2 emissions | Cradle-to-gate | 1 kg | O | X |
5. | [30] | Single-walled carbon nanotubes | EPS 2000/SimaPro | Human health, production capacity, abiotic resources, biodiversity | Cradle-to-gate | 1 g | O | X |
6. | [31] | Nanoclay polypropylene layered silicate nanocomposite packaging film | Not stated/SimaPro Derived from the latter: energy and material data from the pilot plant | Non-renewable energy use (NREU), GHG emissions | Cradle-to-grave | 1000 bags | O | X |
7. | [31] | Nanoclay polypropylene layered silicate nanocomposite agricultural film | Not stated/SimaPro Derived from the latter energy and material data from the pilot plant | GHG emissions | Cradle-to-grave | Coverage of 650 m3 | O | X |
8. | [31] | Nanoclay polypropylene layered silicate nanocomposite automotive panels | Not stated/SimaPro Derived from the latter energy and material data from the pilot plant | NREU, GHG emissions, abiotic depletion, ozone layer depletion, photochemical oxidant formation, acidification, eutrophication | Cradle-to-grave | Internal panel of low-weight family car over 150,000 km operation | O | X |
9. | [32] | Nanoscaled organophilic montmorillonite in PHB fillers | Not stated PlasticsEurope LCA database used | GHG emissions and NREU | Cradle-to-grave | 17-inch CRT monitor | O | O |
10. | [33] | Single-walled carbon nanotubes | Not stated | Human exposure | Cradle-to-grave | 1 kg | O | X |
11. | [34] | Nanoscale semiconductor fabrication and manufacturing | EIO-LCA through EIO model/SimaPro Primary data used | Economic inputs and outputs, GHG emissions (uncertainty included) | Cradle-to-gate | 1 wafer with 300 mm diameter | O | X |
12. | [35] | Nanoclay biopolymer composites | Not stated Ecobilan’s Data for Environmental Analysis and Management (DEAM)™ LCA database used | Energy demand and GHG emissions, non-renewable energy savings | Cradle-to-gate | 1 kg | O | X |
13. | [36] | Carbon nanofibers | Not stated/SimaPro Industrial data of the United States (US) economy for the 20th century and US LCI database used | Energy analysis, GHG emissions, human toxicity potential (sensitivity analysis included) | Cradle-to-gate | 1 kg | O | O |
14. | [37] | Fullerenes and single-walled carbon nanotubes | Not stated PlasticsEurope, LCA database used | Energy consumption, carbon yield | Cradle-to-gate | 1 kg | O | O |
15. | [38] | Single-walled carbon nanotubes | Not stated/SimaPro HiPco model inventory used | Climate change, airborne inorganics, acidification | Cradle-to-gate | 1 g | O | O |
16. | [39] | Carbon nanofibers—Polymer nanocomposites | Not stated PlasticsEurope, LCA databases used | GHG emissions and impact (toxicity impact included) | Cradle-to-gate | Midsize car over 150,000 miles of operation | O | O |
17. | [40] | Nanotitanium dioxide photocatalyst coatings for concrete pavement | EIO-LCA/SimaPro | Economic inputs and outputs, acidification, eutrophication, criteria air pollutants, smog formation | Cradle-to-gate | 1 km lane of pavement | O | X |
18. | [41] | Vapor-grown carbon nanofibers, polymer nanocomposites | Collected from values reported in literature and LCA software/SimaPro | Energy consumption (sensitivity and uncertainty analysis included) | Cradle-to-grave | 1 kWh electricity generated | O | X |
19. | [42] | Yttria-stabilized zirconia, nanostructured coating | EDIP 2003/SimaPro Ecoinvent database used | Ozone depletion potentials, GHG emissions, eutrophication, human toxicity, ecotoxicity, hazardous waste, slags/ashes, bulk waste, radioactive waste, resources | Cradle-to-gate | 1 micrometer thick area of 1 m2 surface | O | O |
20. | [43] | Titanium dioxide nanoparticles | Eco-indicator 99/SimaPro | Carcinogen, climate change, GHG emissions, radiation, ozone layer, acidification, land use, airborne organics and inorganics, (uncertainty analysis included) | Cradle-to-gate | 1 kg | O | O |
21. | [44] | Single-walled carbon nanotube | EIO-LCA through EIO model/SimaPro | Economic inputs and outputs | Cradle-to-gate | 1 kg | O | X |
22. | [45] | Nanoelectronics, multi-walled carbon nanotube | Chain Management by Life cycle assessment (CML)/Umberto Ecoinvent database used | Energy consumption | Cradle-to-gate | 1 kg | O | X |
23. | [46] | Quantum dot photovoltaics | Impact 2002+/SimaPro Ecoinvent database used | Energy consumptions, lower GHG emissions, SOx, NOx emissions | Cradle-to-gate | 1 kg | O | O |
24. | [47] | Silver nanoparticles | Tool for Reduction and Assessment of Chemicals and Other Environmental Impacts (TRACI) 2.0 v-3.01 and EIO-LCA model/SimaPro | Economic inputs and outputs, GHG emissions, acidification, carcinogens, euthrophication, ozone depletion, ecotoxicity | Cradle-to-gate | 1 mg | O | O |
25. | [48] | Nanosilver t-shirts | USES-LCA/SimaPro Ecoinvent database used | GHG emissions, freshwater toxicity, waterborne emissions (sensitivity and uncertainty analysis included) | Cradle-to-gate | 1 kg | O | X |
26. | [49] | Nano-crystalline materials in thin-film silicon solar cells | Not stated/Simapro Ecoinvent database used | Climate change, ozone depletion, GHG emissions, acidification, ecotoxicity, human toxicity (toxicity impact included) | Cradle-to-gate | 1 m2 of module area and 1 kWh | O | X |
27. | [50] | Single-walled carbon nanotubes | EIO-LCA model /SimaPro HiPco data used | Economic inputs and outputs, energy consumption | Cradle-to-gate | 1 kWh | O | X |
28. | [51] | Starch nanocrystals | TRACI 2 and Ecoindicator 99/SimaPro | GHG emissions, acidification, climate change, radiation, ozone layer, ecotoxicity, land use, respiratory organics and inorganics | Cradle-to-gate | 1 kg and 10,000 m2 of packaging material | O | O |
29. | [52] | Black carbon and activated carbon with single-walled and multi-walled carbon nanotubes | Primary data in laboratory-scale study/not stated | Energy consumption | Cradle-to-gate | 1 MJ/kg | O | X |
30. | [53] | Nanoparticles coated recovered fiber paper | ReCiPe, Building for Environmental and Economic Sustainability (BEES), Life Cycle Cost (LCC) and TRACI/SimaPro Ecoinvent and BEES databases used | Energy consumption, NREU, renewable energy use (REU), GHG emissions | Cradle-to-grave | 1 tonne | O | O |
31. | [54] | Cellulose nanowhiskers | ReCiPe/SimaPro Ecoinvent database used | Climate change, water depletion, eutrophication, human toxicity | Cradle-to-gate | 1 g of cellulose nanowhiskers | O | X |
32. | [55] | Carbon nanotubes | USEtox model/SimaPro | Ecotoxicity (uncertainty analysis included) | Cradle-to-gate | 1 kg of carbon nanotubes | O | X |
33. | [56] | Molybdenum sulfide (MoS2) nanoparticles | Not stated/SimaPro Ecoinvent database used | Energy consumption, GHG emissions | Cradle-to-gate | 1 g of MoS2 nanoparticles | O | O |
34. | [57] | Organic photovoltaics from nanomaterials | Not stated/SimaPro Ecoinvent database used | GHG emissions, energy consumption, acidification, ozone depletion potential, human toxicity, ecotoxicity | Cradle-to-grave | 1 kg | O | O |
35. | [58] | Carbon nanotubes | TRACI and primary data/SimaPro Ecoinvent database used | GHG emissions, acidification, GHG emissions, eutrophication, ozone depletion, smog formation, ecotoxicity, human health, respiratory effects | Cradle-to-gate | 1 unit of Si wafer with a surface area of 45 cm2 and 4 g mass | O | X |
36. | [59] | Nano-sized titanium dioxide coatings | BEES 4.0 model/BEES software | Acidification, eutrophication, air pollutants and smog formation potential, GHG emissions, fossil fuel depletion, water intake, human health, ecological toxicity | Cradle-to-gate | 1 m2 of titanium dioxide-coated glass | O | X |
37. | [60] | Nano-coated wooden claddings | ReCiPe, Europe Ecolabel (EU-Ecolabel) /SimaPro 7.3 Ecoinvent database used | Air emissions, water emissions | Cradle-to-grave | 0.01 m2 of coated exterior wooden cladding | O | O |
38. | [61] | Hollow silica nanospheres, nano insulation materials | Primary data in laboratory-scale study/not stated | Energy consumption | Cradle-to-gate | 1 g of hollow silica nanospheres | O | X |
39. | [62] | Nanocellulose | Eco-Indicator 99/SimaPro | Energy consumption, carcinogens, human health respiratory organics and inorganics climate change, GHG emissions, radiation, ozone layer, ecotoxicity, acidification, eutrophication, land use resources | Cradle-to-gate | 10 g equivalent dry mass of the end product nanocellulose | O | X |
40. | [63] | Silver nanoparticles bandages | TRACI/SimaPro Ecoinvent database used | Ozone depletion, GHG emissions, smog formation, respiratory effects, water and soil quality impacts, acidification, eutrophication, human health, ecotoxicity | Cradle-to-grave | 1 g | O | O |
41. | [64] | Carbon nanotubes field emission displays (CNT-FEDs) | TRACI, USEtox/SimaPro Ecoinvent and National Renewable Energy Laboratory (NREL) US LCI database used | GHG emissions, acidification, human health, carcinogens and noncarcinogens. respiratory effects, eutrophication, ozone depletion, ecotoxicity, fossil fuel depletion, ecotoxicity | Cradle-to-grave | 10,000 viewing hours | O | O |
42. | [65] | Cellulose nanocrystals/cellulose nanofibrils from wood pulp | TRACI and primary data of pilot-scale production/SimaPro Ecoinvent database used | Energy consumption, GHG emissions, ozone depletion, acidification, eutrophication, human health, ecotoxicity, fossil fuel depletion | Cradle-to-gate | 1 kg of cellulose nanocrystals | O | X |
43. | [66] | Gold nanoparticles (AuNP) | Not stated/SimaPro Ecoinvent database used | Energy consumption, climate change, metal depletion, agricultural land occupation, freshwater ecotoxicity | Cradle-to-gate | 1 mg of AuNP | O | O |
44. | [67] | Graphite nanoplatelets (GnP) | ReCiPe, USEtox, EDIP,CML/SimaPro Ecoinvent database used | Energy consumption | Cradle-to-grave | 1 kg of epoxy composite loaded with 0.058 kg of GnP | O | O |
45. | [68] | Carbon nanotube-enabled chemical gas sensor | ReCiPe and TRACI 2/SimaPro Ecoinvent database used | GHG emissions, acidification, eutrophication, ozone depletion, smog formation, human health impacts from carcinogenic, noncarcinogenic, respiratory disease, ecotoxicity | Cradle-to-gate | 1 g per chip | O | O |
46. | [69] | Single-walled carbon nanotubes, multi-walled carbon nanotubes | USEtox model/Microsoft Excel | Human toxicity, freshwater ecotoxicity | Cradle-to-gate | 1 nm | O | X |
47. | [70] | Nanomaterials from graphene | USEtox model/not stated | Energy use, water use, human toxicity, ecotoxicity, (sensitivity analysis included) | Cradle-to-gate | 1 kg of graphene in solution | O | X |
48. | [71] | Nano insulation materials consisting of hollow silica nanospheres | Not stated Primary data in laboratory-scale study used | Energy consumption | Cradle-to-gate | 1 g | O | X |
49. | [72] | Cerium Dioxide (CeO2) nanoparticles | Monte Carlo/mathematical modeling software | Toxicity and uncertainty analysis | Cradle-to-gate | 1 tonne | X | O |
50. | [73] | Cellulose nanofibrils from wood pulp | ReCiPe /not stated Ecoinvent database used | Energy use, climate change, acidification, water use (sensitivity analysis included) | Cradle-to-gate | 1 kg | O | X |
51. | [12] | Titanium dioxide, silver and silica nanoparticles in facade coatings/paints | ReCiPe and USEtox/Open LCA tool Ecoinvent database used | GHG emissions, freshwater eutrophication, fossil fuel depletion, acidification, ecotoxicity, human toxicity, human health, resource availability | Cradle-to-gate | 1 square meter of (indoor or outdoor) wall during 80 years | O | O |
52. | [74] | Tungsten disulphide nanoparticles | ReCiPe, CML and primary data collection from an industrial process/SimaPro Ecoinvent database used | Energy resources, GHG emission, acidification, euthrophication, human toxicity | Cradle-to-gate | 1 g | O | X |
53. | [75] | Graphene oxide nanomaterial | USEtox and ReCiPe/SimaPro | Freshwater ecotoxicity (sensitivity analysis included) | Cradle-to-gate | 1 kg | O | X |
54. | [76] | Silver nanoparticles | TRACI and USEtox model/SimaPro | Ozone depletion, GHG emissions, photochemical smog formation, acidification, eutrophication, carcinogens, air pollutants, ecotoxicity, fossil fuel depletion | Cradle-to-grave | 1 kg | O | O |
55. | [77] | Printed electronic temperature sensor composed of specialized carbon nanotube | IMPACT 2002+ model/Simapro Ecoinvent database used | Carcinogens, respiratory organics and inorganics, ionizing radiation, ozone layer depletion, ecotoxicity, GHG emissions, land occupation, NRE, mineral extraction | Gate-to-gate | 2400 sensors/day | - | O |
56. | [18] | Nano-scale zero valent iron | IMPACT 2002+/SimaPro Ecoinvent database used | Climate change, ecosystem quality, human health, resources | Cradle-to-gate | 1 g | O | X |
57. | [13] | Nano-titanium dioxide | USEtox/SimpleBox4Nano | GHG emissions, freshwater eutrophication, fossil fuel depletion, acidification, ecotoxicity, human toxicity, human health | Cradle-to-gate | 1 nm | O | X |
58. | [78] | Nano-silica-modified asphalt mixtures | TRACI/Open LCA tool—Ecoinvent database used | Ecotoxicity, carcinogens, GHG emissions, ozone depletion, acidification, eutrophication, respiratory effects | Cradle-to-gate | 1000 kg production of nano-silica-modified asphalt mixtures | O | X |
59. | [79] | Cellulose nano-sponges | International Reference Life Cycle Data System (ILCD) 2011 Midpoint+/SimaPro Ecoinvent database used | Climate change, ozone depletion, human toxicity, GHG emissions, particulate matter, ionizing radiation, photochemical ozone formation, acidification, eutrophication, freshwater ecotoxicity, water resource depletion, renewable resource depletion | Cradle-to-gate | 1 kg of cellulose nanosponge | O | X |
60. | [10] | Nano-wire based solar cells | Primary data in laboratory-scale/SimaPro Ecoinvent database used | Land use, eutrophication, acidification, GHG emissions, photochemical oxidation, climate change, ecotoxicity, ozone depletion, human toxicity | Cradle-to-gate | 1 kWh of electricity production | O | X |
61. | [80] | Nano-scale zero-valent iron | IMPACT 2002+/Simapro Ecoinvent database used | Energy consumption, human health, atmospheric emissions | Cradle-to-gate | 1 kg | O | X |
62. | [81] | Binary oxides nanoparticles | TRACI 2.1/SimaPro Ecoinvent and US Life Cycle Inventory used | Ozone depletion, GHG emissions, smog, acidification, eutrophication, carcinogenic and noncarcinogenic, respiratory effects, ecotoxicity, fossil fuel depletion | Cradle-to-gate | 1 kg | O | X |
63. | [82] | Photo-Fenton catalysts with combinations of magnetite nanoparticles semiconductor | IMPACT and ReCiPe/SimaPro Ecoinvent database used | Climate change, ozone depletion, acidification, eutrophication, toxicity, fossil depletion | Cradle-to-gate | 1 kg | O | X |
64. | [83] | Fly ash hydrated lime blended concrete nanosilica | Not stated/SimaPro Ecoinvent database used | GHG emissions, acidification, photochemical oxidant formation impact | Cradle-to-gate | kg/m3 | O | X |
65. | [84] | Nano-powder in glass bottle wastes | Not stated Primary data in laboratory-scale study used | CO2 emission, energy consumption, fuel consumption | Cradle-to-gate | 1 m3 | O | X |
66. | [85] | Nano-hydroxyapatite | IMPACT/SimaPro | GHG emissions, non-renewable energy, respiratory inorganics, human health, climate change, resources, ecosystem quality | Cradle-to-gate | 10 g | O | O |
67. | [86] | Nano calcium carbonate | Not stated/SimaPro Ecoinvent database used | GHG emissions, CO2 emissions (sensitivity analysis included) | Cradle-to-gate | 1 g | O | X |
68. | [87] | Nano-enhanced carbon fiber-reinforced polymer | ILCD Midpoint +/SimaPro Ecoinvent database used | Human toxicity, respiratory effects, ionizing radiation, photochemical oxidation, climate change, ozone depletion, GHG emissions, human health, ecotoxicity, acidification, eutrophication, land occupation, water consumption, NRE, mineral extraction, water turbined | Cradle-to-gate | 1 product piece | O | X |
69. | [88] | Silver nanomaterials | TRAP (Toxicity Relationship Analysis Program)/REST-MSC tool | Water and soil emissions | Cradle-to-gate | mg/kg | O | X |
70. | [17] | Engineered nanomaterials | In vivo No-Observed-Adverse-Effect Level (NOAEL), Lowest-Observed-Adverse-Effect Level (LOAEL), EC50 or ED50 (Effective Dose/Dosage) methods/not stated | Human health, human toxicity | Cradle-to-gate | 1 kg | O | X |
71. | [89] | Nano-grid | ReCiPe/OpenLCA tool Ecoinvent database used | Ecotoxicity, human health, resources (sensitivity analysis included) | Cradle-to-grave | 1 MWh | O | X |
No. | Limitations | Uncertainties | Possible Approaches/Recommendations |
---|---|---|---|
1. | Scarcity of knowledge: End-of-life stages. Potential of emissions from various waste management processes. | Uncertainties in outputs, final emissions, and interpretation stage. |
|
2. | Inadequate data on LCI. | Uncertainties in process inputs, outputs, and final emissions. |
|
3. | Lack of characterization factors in LCIA. | Uncertainties in fate, exposure, and effect factors. |
|
4. | Invalid assumptions in the interpretation stage. | Uncertainties in results being irrelevant and unclear conclusions if interpreted out of context. |
|
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Nizam, N.U.M.; Hanafiah, M.M.; Woon, K.S. A Content Review of Life Cycle Assessment of Nanomaterials: Current Practices, Challenges, and Future Prospects. Nanomaterials 2021, 11, 3324. https://doi.org/10.3390/nano11123324
Nizam NUM, Hanafiah MM, Woon KS. A Content Review of Life Cycle Assessment of Nanomaterials: Current Practices, Challenges, and Future Prospects. Nanomaterials. 2021; 11(12):3324. https://doi.org/10.3390/nano11123324
Chicago/Turabian StyleNizam, Nurul Umairah M., Marlia M. Hanafiah, and Kok Sin Woon. 2021. "A Content Review of Life Cycle Assessment of Nanomaterials: Current Practices, Challenges, and Future Prospects" Nanomaterials 11, no. 12: 3324. https://doi.org/10.3390/nano11123324