On the successful chemical recycling of carbon fiber/epoxy resin composites under the mild condition

Recycling of carbon fibre reinforced plastics by electrically driven heterogeneous catalytic degradation of epoxy resin

“…SI1 †). Fluidized bed [16][17][18] Solvolysis [9][10][11][12] Supercritical/ subcritical [13][14][15] Facility CFRP was purchased from Carbon Composites Company Limited (Hong Kong) with an epoxy resin content of 31.5%. Each layer of CF cloth is made by orthogonal weaving of longitudinal and transverse CFs.…”

“…Although the CFRP materials reach the end of their service life, the CFs themselves generally retain their properties; 4 therefore, the prospect of recycling CFRP composites without damaging the mechanical properties and dimensions of CFs is of great commercial interest. The recovery value of epoxy resin is not comparable to that of CFs; thus, in recent years, a great number of studies have been conducted on the reclamation of CFs from composite wastes, including mechanical recycling such as shredding and milling, 5,6 pyrolysis at high temperature, 7,8 chemical decomposition using solvents such as methanol, ethanol, 1-propanol and acetone, [9][10][11][12] chemical recycling under sub-/supercritical conditions, [13][14][15] decomposition in high-temperature fluidized bed processes [16][17][18] and an electrochemical recycling method. 19 However, as shown in Table 1, the existing techniques generally suffer from various drawbacks such as requiring complicated processes and superior facilities, pollution generation and damage to the CFRP waste.…”

A Sustainable Approach to the Low-Cost Recycling of Waste Glass Fibres Composites towards Circular Economy

“…It should be mentioned that these approaches also consume significant amounts of energy and release highly toxic gases [6]. Although these days environmentally clean chemical approaches are used to digest thermoset resins, in the past, strong oxidation mediums consisting of sulphuric and nitric acids were typically used to recycle the fibres [21,22]. Nowadays, enormous advances in chemical/electrochemical recycling methods have been made to minimize the damage to the fibres during recycling processes and to keep consistency of the fibre architecture [23][24][25].…”

A review on the recycling of waste carbon fibre/glass fibre-reinforced composites: fibre recovery, properties and life-cycle analysis

“…The use of ultrasonic increased the decomposition ratio thrice when compared to the same process without ultrasonics. Similarly, Jiang et al [114] used ultrasonics so that the waste CFRP could be pre-treatment with a nitric acid solution. The pre-treated CFRP was subjected to Macrogel 400 and a potassium hydroxide (KOH) system at 160 °C for 200 min.…”