壳聚糖
吸附
Zeta电位
弗伦德利希方程
解吸
化学
核化学
化学工程
材料科学
作者
Changjin Jiang,Ting Zhang,Shuhui Li,Zhaoguang Yang
出处
期刊:Research Square - Research Square
日期:2022-02-14
标识
DOI:10.21203/rs.3.rs-1261066/v2
摘要
Abstract Fe(III)-chitosan and Fe(III)-chitosan-CTAB composites were prepared using an ionotropic gelation method. Various techniques were used to analyze the morphology, structure, and property of the adsorbents, including SEM, EDS, FT-IR, XPS, and zeta potential. Compared with Fe(III)-chitosan, Fe(III)-chitosan-CTAB was more effective for As(V) adsorption at a wide range of pH (3–8). The adsorption of As(V) onto Fe(III)-chitosan and Fe(III)-chitosan-CTAB could reach equilibrium in 20 min, and their maximum adsorption capacities were 33.85 and 31.69 mg g ‒1 , respectively. The adsorption kinetics was best described by the pseudo-second-order model ( R 2 =0.998 and 0.992), whereas the adsorption isotherms was fitted well by the Freundlich model ( R 2 =0.963 and 0.987). The presence of H 2 PO 4 − significantly inhibited the adsorption of As(V) onto Fe(III)-chitosan and Fe(III)-chitosan-CTAB, and humic acid also led to a slight decrease in As(V) adsorption by Fe(III)-chitosan-CTAB. Over 94% of As(V) at the initial concentration of no more than 5 mg L −1 was removed from real water by the two adsorbents. 1% ( w / v ) NaOH solution was determined to be the most suitable desorption agent. Fe(III)-chitosan and Fe(III)-chitosan-CTAB still maintained their initial adsorption capacities after five adsorption-desorption cycles. Based on different characterization results, both electrostatic attraction and surface complexation mechanisms played important roles in As(V) adsorption on Fe(III)-chitosan and Fe(III)-chitosan-CTAB.
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