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首页> 外文期刊>Materials >Modification of 13X Molecular Sieve by Chitosan for Adsorptive Removal of Cadmium from Simulated Wastewater
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Modification of 13X Molecular Sieve by Chitosan for Adsorptive Removal of Cadmium from Simulated Wastewater

机译：壳聚糖修饰的13X分子筛用于吸附去除模拟废水中的镉

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Chitosan was used to modify a 13X molecular sieve to improve its cadmium removal capability. After being modified with 2% chitosan-acetate for 2 h at 30 °C, significant uptake of Cd 2+ could be achieved. The uptake of Cd 2+ on the modified 13X molecular sieve followed the Langmuir isotherms with a capacity of 1 mg/g. The kinetics of Cd 2+ removal by modified 13X molecular sieve followed a pseudo second-order reaction, suggesting chemisorption or surface complexation. The Cd 2+ removal with a sorbent dose of 2 g/L from an initial concentration of 100 μg/L reached more than 95% in 90 min. The equilibrium Cd 2+ concentration was <5 μg/L, which meets the requirements of “Standards for Irrigation Water Quality” (GB5084-2005) (10 μg/L) and MCL and MCLG for groundwater and drinking water (5 μg/L) set by United States Environmental Protection Agency.
机译：壳聚糖用于修饰13X分子筛以提高其去除镉的能力。在30°C下用2％壳聚糖乙酸酯改性2 h后，可以实现Cd 2+的显着吸收。修饰的13X分子筛对Cd 2+的吸收遵循Langmuir等温线，容量为1 mg / g。修饰的13X分子筛去除Cd 2+的动力学遵循伪二级反应，表明化学吸附或表面络合。在最初的100μg/ L浓度下，以2 g / L的吸附剂剂量去除Cd 2+在90分钟内达到95％以上。 Cd 2+的平衡浓度<5μg/ L，符合《灌溉水质量标准》（GB5084-2005）（10μg/ L）的要求，地下水和饮用水的MCL和MCLG（5μg/ L）的要求）由美国环境保护局设定。

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