Papers by Keyword: Green

Abstract: This study aimed to determine the effect of concentration and immersion time of Salak (Salacca zalacca) Seed extract as a green inhibitor on the corrosion inhibition efficiency and corrosion rate of AISI 1040 steel in a 1M HCl environment. The chemical composition of AISI 1040 steel was confirmed using OES testing to verify its compliance with AISI 1040 chemical standards. The antioxidant activity of the salak (Salacca zalacca) seed extract was determined through the 1,1-Diphenyl-2-Picrylhydrazyl (DPPH) test yielding an IC50 value of 192.55 ppm, indicating weak antioxidant activity. Qualitative phytochemical analysis confirmed the presence of flavonoids and tannins in the extract, as verified by Fourier Transform Infrared (FTIR) testing. The study explored concentration variations ranging from 100 to 500 ppm and immersion time variations of 10 to 30 days were used. The highest inhibition efficiency was obtained at 500 ppm concentration, while the lowest was at 100 ppm, with values of 40.26% and 18.90% respectively. Additionally, the corrosion rate was reduced to 0.035 mm/year at the highest concentration of 500 ppm. These findings demonstrated the potential of salak (Salacca zalacca) seed extract as an eco-friendly, effective corrosion inhibitor for AISI 1040 steel.

Abstract: This study investigates the corrosion inhibition properties of Salak (Salacca zalacca) peel extract as a green inhibitor on AISI 1040 steel in a 1M HCl acidic environment and focusing on secondary metabolites such as flavonoids and tannins. The qualitative phytochemical analysis showed antioxidant activity of the inhibitor extract was categorized as moderate with an IC50 value of 105.219 ppm. Functional group analysis using FTIR indicated that the flavonoids and tannins in the extract acted as antioxidants and inhibited corrosion growth. The weight loss test revealed the highest inhibition efficiency 11.13% was achieved at a concentration of 200 ppm after 20 days of immersion. In the potentiodynamic polarization test, the corrosion rate was 0.025 mm/year at the same concentration and immersion time. These results suggest that Salak (Salacca zalacca) peel extract can effectively inhibit corrosion at spesific concentrations but its efficiency diminishes at higher concentrations.

Abstract: Silicon oxide is widely used as a thin film to improve the surface properties of materials, because it is of anti-resistance, hardness, corrosion resistance, dielectric, optical transparency and high delivery property etc. Therefore. Recent growing interest and efforts of scientists in this area are due to vitality in achievement of a better quality of life and health care for human beings, designing novel methods of making them more effective through hybridization with silver nanoparticles. Hence the need for nanoparticles capable of transmitting light with an ‘enhanced’ optical property for optoelectronics. In this study, silica was extracted from rice husk ash (RHA) using alkaline/acid leaching method, the AgNps was synthesized from Anogeissus leiocarpus extract using water extraction process, while the hybridization of silica with AgNps was carried out using in-situ and co-mixing method. Characterization was achieved using UV-Visible to confirmed the presence of silica at 290 nm, 291 nm, and 295 nm at different time intervals of 0, 60, 90. Changes in intensities of the bands indicate perfect hybridization with an enhancement in optical property. The XRD pattern of the silica-silver nanoparticles showed crystalline peaks at 2θ = 22.0^o, 26.5^o,29.5^o 41^o, which have been keenly indexed as face centred cubic Ag^o nanocrystals arising from Anogeissus leiocarpus extract. The increase in absorbance value of silica from (0.5 to 1.45, 1.50 respectively) confirms the improvement in optical properties of silica due to presence of AgNPs. The SEM analysis revealed the cap shaped spherical morphology and uniform size distribution of the nanohybrids within the range of 18.20 nm. Capping obtained is an evidence of organic matter in the plant extract. The percentage elemental compositions of Ag, Si, C and O in the nanohybrids were revealed by EDX analysis where Ag and Si are dominant. Therefore, silica-silver nanocomposite can be used as improved raw material in optical, ceramics and other relevant industries.

Abstract: The national decision on the neutrality of global carbon emission as well as decarbonization focus drives the need for the transformation of the building and construction sector of the economy. Thus, green building materials and its production is a better means of achieving depletion in carbon emission. More so, to achieve excellent green development in the construction industry as well as the goal of decarbonization, there is a need to investigate the emerging trends in the sustainable materials for green buildings. Hence, this study focused on the review of some of the existing green materials and its effect on the building construction. Findings from literature studies revealed six different green building materials which include bamboo, cork, straw bale, reclaimed wood, sheep’s wool and hempcrete. It was reported that each of the green material have excellent thermal insulation property, low emission of CO₂ and has the ability to be recycled, thus, bringing sustainability in the circular economy as well as eco-friendliness of the material. These findings expand the scope of green materials application and can inform the government to formulate policies that will encourage sustainable green buildings. Keyword: Sustainability, Development, Green Buildings, Green Materials, Emissions

Abstract: Cellulose microfibers (CMF) were produced by utilizing recycled newspaper paper (RNP) as starting material. This approach is considered as green since recycling newspaper leads to the environment preservation and also cost-effective. The effect on the structural properties of cellulose produced at different stage of pretreatment were investigated by using Fourier transform infrared (FTIR), Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Thermal gravimetric analysis (TGA). The FTIR and SEM demonstrate that the hemicellulose and lignin was successfully removed from the structure of the CMF. XRD and TGA results revealed that the different step of pretreatment was increased the crystallinity and thermal stability of CMF increased gradually. The improvement in CMF crystallinity has improved its thermal properties which is important in the field of reinforcement material.

Abstract: The Green polyurethane adhesive system was prepared using two types palm oil polyol having different molecular weight ~1100 (GA) and ~ 2200 (GB) respectively, 4-4-diphenylmethane diisocyanate (MDI) and nanoclay fillers via in-situ process. Adhesives were applied on both sides of two untreated wood substrate using brushing technique for lap shear test. The attached substrate then undergoes the curing process for 24 hours at room temperature with relative humidity of 50±5%. The disappearance of NCO peak in the Fourier transform infra-red (FTIR) spectrum showed that MDI has completely reacted to form PU. Contact angle measurement proved that high wetting condition obtains from green polyurethane (PU) adhesive. PU adhesive wood joint improved in shear strength with addition of 1wt% nanoclay for both green polyol.

Abstract: In this paper, combining with the characteristics of green building energy saving, constructs the evaluation index system of green building energy conservation and green building energy efficiency design based on support vector machine, to lay the theoretical foundation for the construction of green energy-saving design evaluation.

Abstract: To advocate and promote environmental protection building decoration materials is the inevitable trend of the development of the times is the requirement of sustainable development, also is the construction of environmental protection, healthy living security. We introduced the environmental protection building decoration material advantages, classification and the current flow of Ding green building and decoration materials, and the environmental protection building material prospects into Ding exploratory prospects.

Abstract: Recently the potential development of green architecture in our country is huge, but inaccurate control of green building’s incremental cost is the key reason for restricting its development. After analyzing influencing factors of green building’s incremental cost, four influencing factors are put forward:technical measures, project regions,fixed position and time to research feasibility. On basis of the factors, the ways are proposed to reduce green building’s incremental cost, which provides theoretical basis for the development of green architecture.

Abstract: The urbanization rate of Nanjing is at the forefront of the country. According to the objectives and requirements of Nanjing to build a modern, international, humanistic green city.Firstly, this paper analyzed the connotation and the basic conditions of green ecological wisdom of Nanjing. Then it proposed the idea , objectives, principles and path of green ecological wisdom city construction of Nanjing. And highlighting the top-level design, building the green ecological environment, focusing on mechanism innovation to promote the city construction reasonably, strengthening the technical innovation to promote the interactive construction of city, promoting the industrial and construction of urban interaction were also proposed .It was needed to promote public goods , focus on public service platform, innovate governance model and build double-acting system with markets and government.