Abstract
Numerous countries have shown signs of environmental pollution to prioritize economic growth and benefits, leading to seriously contaminated waters. This work indicated the method to synthesize a green material, which could remove contaminants to protect the natural environment. The porosity and functionality effects of amine-functionalized activated carbon (AFAC) enhanced the removal of toxic heavy metals (THMs) in aqueous solution. The raw activated carbon (RAC) was thermally modified with ultrahigh pure nitrogen (UHPN) at 500°C and 1000°C and then amine-functionalized with coupling agent of aminopropyltriethoxysilane (APS). They were denoted as AFAC-5 and AFAC-10, respectively. The data showed an enhanced metal adsorption capacity of the AFACs, because the modification produced more desired porosity and increased amine functional groups. AFAC-10, modified at a higher temperature, showed much higher THM adsorption capacity than AFAC-5, modified at a lower temperature, and RAC. The adsorption capacity decreased in the following order: Ni > Cd > Zn, which was in good agreement with the increasing electronegativity and ionic potential and the decreasing atomic radius. The maximum THM adsorption capacity of AFAC-10 for Ni, Cd, and Zn was 242.5, 226.9, and 204.3 mg/g, respectively.
Highlights
National economic development is a process of improving the physical and spiritual living conditions of that country through the production of property, improvement of social relations, and improvement of cultural quality [1,2,3,4]
The liquid-phase treatment was conducted by adding 5 mL aminosilane solution of aminopropyltriethoxysilane (APS, CAS Number 919-30-2, assay ≥ 98%), and the solution was gently ultrasonicated for 1 h at 60°C when the suspension was homogeneous. ese products were washed with deionized water (DI water) several times and ovendried at 105°C for 6 h as precursors. e final material was denoted as amine-functionalized activated carbon (AFAC)-5 and AFAC-10 with different heating temperatures at 500°C and 1000°C, respectively (Figure 2)
Porosity Structure and elemental analysis (EA) Analysis. e EA and textural characterization results in Table 1 confirmed that the thermal treatment and APS polymer dispersion strongly affected the BET surface area (BET), total pore volume (TVP), and mean pore diameter (MPD) of AFACs
Summary
National economic development is a process of improving the physical and spiritual living conditions of that country through the production of property, improvement of social relations, and improvement of cultural quality [1,2,3,4]. The source of water for living and natural waters in developing countries, such as Vietnam, Laos, and Cambodia, is increasingly polluted, especially heavy metal contaminations [7,8,9,10]. Journal of Analytical Methods in Chemistry villages is increasingly polluted by wastewater, exhaust gas, and solid waste. In these big cities, large industrial zones and hundreds of industrial production facilities are polluting the water environment due to the absence of facilities and waste treatment facilities.
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