## 1 Introduction  
Owing to the carbon-free electricity production from nuclear power plants, they are becoming a serious alternative for curtailing global emissions of greenhouse gases in the atmosphere. However, during the process of the nuclear fuel cycle, a variety of radioactive wastes are generated. Nuclear wastes are known to contain rare-earth-transition metals and long-life actinide elements. These radio-nuclides can be accidentally discharged into the environment (soils, potable water sources, and the atmosphere) and, hence, over time become very dangerous to the biosphere and human health. In order to address the critical challenge of nuclear waste disposal, numerous radio-element immobilization strategies have recently been proposed in the literature [1, 2, 3, 4, 5]. The aim of these strategies is essentially to encapsulate hazardous radio-elements into physically and chemically stable matrices and to stock the resulting radioactive materials in deep geological disposal sites, thus allowing them to safely and slowly decay into stable elements. From this perspective, researchers have examined the physical barrier characteristics of various types of solid materials, such as cementitious materials [6], glass [7; 8; 9; 10], ceramics [11; 12; 13; 14; 15], composite ceramics [16], and glass-ceramics [17; 18; 19; 20; 21; 22]. Among them, glass-ceramics nowadays constitute the best materials for the immobilization of radio-elements [20; 21; 22]. This can be attribute to two main reasons. First, in glass ceramics, nuclear contaminants are bound tightly to the crystalline phase(s) encapsulated in glass matrices. Second, glass matrices behave as secondary barriers. These contribute to limiting any release of radio-nuclides in case the material comes into direct contact with aggressive media for a long time. Nowadays, research on radio-nuclide pollution is more focused on nuclear wastewater treatments. In this regard, novel physical, chemical, and biological treatment-processes have to be tested with the goal of eliminating radioactive pollutants to upgrade water quality and safeguard public health. Thus, many remediation technologies, e.g., coagulation/flocculation [23; 24; 25], membrane technologies [26; 27; 28; 24], precipitation [29; 24], precipitation from molten salt electrolyte [30], electro-remediation [24], biological treatment and bio-remediation [24], ion exchange/ resins [31; 32; 33; 34; 35], and adsorption [36; 24; 37; 38; 39; 40], have previously been employed with the aim of removing radioactive elements from nuclear liquid wastes, and thus, of avoiding their spread into ecosystems. Among these methods, adsorption has been found to be the most effective, because it enables the generation of intermediate \"radioactive solid wastes\" that can then be transformed into more chemically stable materials for safe disposal. This was accomplished, e.g., by employing aluminosilicate adsorbents such as clay materials (bentonite) and industrial byproducts (fly ash) [41]. Their ability to fix radio-nuclides on their surface and to immobilize them thermally within stable aluminosilicate matrices has been well-evidenced experimentally. In addition, the generated aluminosilicate glasses possessed excellent fixation performance and could be further transformed into aluminosilicate mineral crystals through controlled processes. Brick is a building material that is widely produced worldwide. It is considered a composite material that contains miscellaneous minerals such as quartz, kaolin/metakaolin, illite, montmorillonite, chlorite, and feldspars [42].