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Fragrance Finishing on Textile Substrate for Odour Control
Published in G. Thilagavathi, R. Rathinamoorthy, Odour in Textiles, 2022
Thillaipandian Hemamalini, Venkateshwarapuram Rengaswami Giri Dev
Zeolite is an aluminosilicate mineral found in abundance and used for various technical applications, such as medicine, construction, agriculture, environmental protection, gas, and petrochemical treatment. The polymer offers a microporous structure with the crystalline component of clinoptilolite, which forms a tetrahedron structure with other impurities, montmorillonite and mordenite, which acts as an effective adsorbent for absorbing volatile chemical compounds from the environment. The polymer was treated with surface mercerized cotton and alkali-treated polyester fabric in the form of nanoparticles to study the efficiency of coated fabric for UV protection after treating with fluorescence whitening agents, and antimicrobial activity after treating with an antibiotic, namely azithromycin. It was reported that cotton fabric offered higher UV resistance compared to polyester fabric and also promoted wound healing activity by inhibiting the growth of microorganisms in the in-vitro condition (Grancarić, Tarbuk, and Kovaček 2009).
Adsorbents
Published in Deepak Gusain, Faizal Bux, Batch Adsorption Process of Metals and Anions for Remediation of Contaminated Water, 2021
Shikha Dubey, Deepak Gusain, Yogesh Chandra Sharma, Faizal Bux
The utilization of natural zeolites in the treatment of water/wastewater containing several contaminants is one of the most established areas of their application. Zeolites exhibit various fascinating properties such as high porosity, high ion-exchange capability, high sorption capacity due to sieving properties, cost-effectiveness, and outstanding selectivity for diverse cationic species that commonly go together with a release of some exchangeable cations (e.g. K+, Na+, Ca2+, and Mg2+) that are relatively innocuous (Martínez and Corma 2011). In addition, they are easy to handle and allow cost-effective full-scale applications. These properties led zeolites to be explored for the treatment of water laden with heavy metals.
Crop Improvement and Applied Nanobiotechnology
Published in Cherry Bhargava, Amit Sachdeva, Nanotechnology, 2020
Another approach of nanotechnology regarding reclamation of soil is the use of zeolite crystals. Zeolites are the crystalline cage-like structure having the capability of exchanging ions and selectively holding water molecules. They are the hydrated form of alkali or alkali earth cations of aluminosilicates (Mumpton, 1985). These associated properties of zeolite make it suitable for soil remediation like the removal of toxins, increasing the clay-silt fractions, improving nutrient levels and the water-holding capacity. It has a high cation exchange capacity which makes it suitable to maintain the pH of the soil. The abandoned mine soils may contain certain harmful gases like H2S and SO2 and the good absorbing capability of zeolite can remove these gases, favoring the growth of vegetation. Mine soils lack the macronutrient element which is required for the growth of vegetation. These include nitrogen, phosphorous, and potassium. To replace nitrogen in the soil, nitrogen-fixing bacteria can play a major role, but the inappropriate condition of the soil may prevent their growth. Tagging zeolite with NH4+ can help to replenish N to the soil. Further NH4+ form will prevent nitrogen from volatilization (Lai et al., 1986).
An experimental investigation on geotechnical properties of a clayey soil stabilised with lime and zeolite in base and subbase courses
Published in Road Materials and Pavement Design, 2022
Aghileh Khajeh, Reza Jamshidi Chenari, Hossein MolaAbasi, Meghdad Payan
To date, the beneficial aspects of zeolite usage have been extensively studied in concrete and cement-treated sands and silty sands (Ahmadi Chenarboni et al., 2021; Jamshidvand et al., 2021; Karakurt et al., 2010; Kordnaeij et al., 2019; MolaAbasi et al., 2018, 2020; Tran et al., 2019). Despite the very fact that zeolite can be markedly effective in the soil stabilisation process due mainly to its specific characteristics, such as its low cohesion and eco-friendly nature, very few studies have focused on the role it plays in stabilising clayey soils to improve their mechanical properties. In particular, there are insufficient studies on the influence of lime replacement with zeolite on the shear response (stress–strain behaviour) and shear strength parameters of fine-grained soils to be used in various road construction and infrastructure projects. In this study, the effect of zeolite and lime on the mechanical properties of a low plasticity clay has been thoroughly investigated through performing a set of experiments, including pH, Atterberg limits, standard Proctor, unconfinedcompressive strength (UCS), and unconsolidated undrained (UU) triaxial tests. Indeed, the main objective of the present study is to present the different characteristics of the environmentally friendly materials for base and subbase courses whose properties and performance satisfy the required strength and stiffness criteria.
Evaluation of the Effectiveness of Composite Mineral Remediation Agents on Cd Immobilization in Soils and Rice
Published in Soil and Sediment Contamination: An International Journal, 2022
Junji Zhang, Zeming Shi, Shuting Liu, Shijun Ni, Xinyu Wang, Weiwen Huang
Previous studies have shown that soil amendments can increase soil pH, which results in an increase in surface charge (−ve) and formation of hydroxyl groups, thus reducing the activity and bioavailability of Cd. (Hamid et al. 2019; Lim, Lee, and Yong 2015) CaCO3 in mineral fertilizer can react with H+ in soil to increase hydroxyl groups which raises soil pH. The release of Ca2+, K+, Mg2+ from mineral fertilizers can also raise soil pH. (Guo et al. 2013). Meanwhile, the adsorption of ions by synthetic zeolite can also increase soil pH. (Ramesh et al. 2011). This study showed that all of the remediation agents utilized could effectively improve the pH of incubation and field soil. The results also indicate that the ability of mineral fertilizer to improve soil pH was stronger than that of synthetic zeolite, but the effect of synthetic zeolite on increasing soil pH lasted longer. Zeolites can be used as carriers of nutrients and can release nutrients slowly over time to continuously change soil physicochemical properties. (Reháková et al. 2004). The results also indicate that the effect of remediation treatments on soil pH varied with time. The effect of mineral fertilizer on soil pH was mainly effective at the tillering stage and booting stage, while synthetic zeolite was effective on the whole growth cycle of rice. At the tillering and booting stages, the combination of mineral fertilizer and synthetic zeolite led to the largest increase of pH among all amendments.
Air dehumidification with advance adsorptive materials for food drying: A critical assessment for future prospective
Published in Drying Technology, 2021
Mohamad Djaeni, Dewi Qurrota A’yuni, Misbahudin Alhanif, Ching Lik Hii, Andri Cahyo Kumoro
Zeolites are popularly recognized for their superior adsorption properties because of their porous crystalline structure leading to a high specific surface area. The zeolite crystal is composed of a three-dimensional tetrahedral structure of SiO4 and AlO4, which are connected by sharing oxygen atoms and demonstrate a great adsorption performance.[70,71] The crystal framework topology also categorizes the zeolite types.[72] In the wastewater management system, zeolites either derived from natural resources or synthesized are known for their role in the removal of heavy metals, such as copper, lead, iron, manganese, zinc, and chromium and various types of dye.[72,73]