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The impact of various calcium ion sources on the curing efficacy of MICP
The impact of four distinct calcium sources on the microbial solidification of sand in the Kashi Desert, Xinjiang, was investigated. A wind tunnel test over a 60-day period revealed the cracking behavior of four different complex calcium nutrient solutions. By comparing the bearing capacity and the results from dry–wet cycling and freeze–thaw cycle tests, it was concluded that the sample treated with calcium gluconate exhibited superior sand fixation performance, whereas the sample treated with calcium acetate showed weaker sand fixation effects. The microstructure of the treated sand samples was analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Elemental analysis was conducted via energy dispersive spectroscopy (EDS), and functional groups were identified through Fourier transform infrared spectroscopy (FTIR). These experimental findings hold significant implications for soil remediation, pollutant removal in soil, enhancement of soil fertility, and desert soil stabilization.
Preparation of unsaturated MIL-101(Cr) with Lewis acid sites for the extraordinary adsorption of anionic dyes
Anionic dyes contaminate water and severely disrupt aquatic ecosystems, urgently demanding effective treatment solutions for safety. This study explores the synthesis of unsaturated MIL-101(Cr) and its exceptional performance in removing anionic dyes from polluted water systems. The synthesized MIL-101(Cr) exhibits medium Lewis’s acid and strong Brønsted acid sites, a high specific surface area (>3000 m2/g), and a Zeta potential of 30 mV, contributing to its strong adsorption capability. Adsorption studies reveal Langmuir isotherm model fitting, with maximum adsorption capacities of 4231, 1266, and 568 mg/g for Acid Blue 92, Congo Red, and Acid Blue 90, respectively. The chemisorption process follows pseudo-second-order kinetics and is spontaneous and exothermic. MIL-101(Cr) demonstrates chemical and water stability, maintaining over 80% removal efficiency after five recycling cycles. This research provides valuable insights into treating anionic dye-contaminated wastewater using MIL-101(Cr) as an efficient adsorbent.
Development of zeolite adsorbents for CO2 separation in achieving carbon neutrality
The escalating atmospheric CO2 concentration has become a global concern due to its substantial influence on climate change, emphasizing the necessity of carbon capture to achieve carbon neutrality. Adsorption-based CO2 separation is a promising approach for carbon capture, highlighting the importance of developing solid porous materials as effective adsorbents. Among these porous materials, zeolites stand out as promising adsorbents due to their extensively tunable adsorption/separation properties, superior structural stability, non-toxicity, and cost-effectiveness. This review provides a comprehensive overview of the mechanisms, strategies, and prospects for zeolite development in separating CO2 from critical scenarios, encompassing flue gas (CO2/N2), natural/bio/landfill gases (CO2/CH4), and air, respectively. This review outlines general mechanisms for CO2 separation using zeolites, discusses specific strategies for zeolite development, and concludes with a summary of current findings and an outlook for future research.
A comprehensive review of KCC-1 fibrous silica for water treatment
The growing global demand for freshwater necessitates advanced water treatment technologies. This review highlights the application of fibrous silica spheres, KCC-1, in water remediation, focusing on the removal of heavy metals and organic dyes. KCC-1’s unique fibrous morphology, high surface area, and physicochemical properties make it a promising adsorbent. This work examines its synthesis, modifications, and advantages, providing insights into optimizing KCC-1-based adsorbents for sustainable water treatment.
In-situ adsorption-coupled-oxidation enabled mercury vapor capture over sp-hybridized graphdiyne
Developing efficient and sustainable carbon sorbent for mercury vapor (Hg0) capture is significant to public health and ecosystem protection. Here we show a carbon material, namely graphdiyne with accessible sp-hybridized carbons (HsGDY), that can serve as an effective “trap” to anchor Hg atoms by strong electron-metal-support interaction, leading to the in-situ adsorption-coupled-oxidation of Hg. The adsorption process is benefited from the large hexagonal pore structure of HsGDY. The oxidation process is driven by the surface charge heterogeneity of HsGDY which can itself induce the adsorbed Hg atoms to lose electrons and present a partially oxidized state. Its good adaptability and excellent regeneration performance greatly broaden the applicability of HsGDY in diverse scenarios such as flue gas treatment and mercury-related personal protection. Our work demonstrates a sp-hybridized carbon material for mercury vapor capture which could contribute to sustainability of mercury pollution industries and provide guide for functional carbon material design.
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