Sugarcane pulp residue （SPR）, a waste from sugar-refinery, which possesses a large surface area, can be used for removing chromium （Cr（Ⅲ） and Cr（Ⅵ）） from wastewater. In this work, the kinetics, isotherms of...Sugarcane pulp residue （SPR）, a waste from sugar-refinery, which possesses a large surface area, can be used for removing chromium （Cr（Ⅲ） and Cr（Ⅵ）） from wastewater. In this work, the kinetics, isotherms of Cr（Ⅲ） and Cr（V[） adsorption and their removal by SPR were investigated. The results show that the removal percentages of Cr（Ⅵ） and Cr（Ⅲ） increase with increasing SPR dosage and temperature and decrease with increasing SPR particle size and the initial concentration of chromium ions. However, the influence of pH value on the Cr（Ⅵ） removal differs from that of the Cr（Ⅲ） removal. The Cr（Ⅵ） removal percentage decreases with increasing pH values, while the Cr（Ⅲ） removal percentage increases with increasing pH value. The adsorption kinetics of Cr（Ⅵ） and Cr（Ⅲ） well fits with pseudo-second-order model. Langmuir adsorption isotherm can well describe the adsorption phenomena of chromium ions with the maximum adsorption capacity of 0.567 mg/g for Cr（Ⅵ） and 3.446 mg/g for Cr（Ⅲ）. Moreover, SPR reveals higher adsorption capacity for Cr（Ⅲ） than that for Cr（Ⅵ）, which implies that SPR has more potential application for Cr（Ⅲ）-containing wastewater treatment than that for Cr（Ⅵ）-containing wastewater treatment.展开更多
Aerogel composed of polyaniline/cellulose nanofiber(PANI/CNF)was synthesized by a two-step method and used as an adsorbent to remove Cr(Ⅵ)from wastewater in this study.Adsorption results showed that PANI/CNF aerogel ...Aerogel composed of polyaniline/cellulose nanofiber(PANI/CNF)was synthesized by a two-step method and used as an adsorbent to remove Cr(Ⅵ)from wastewater in this study.Adsorption results showed that PANI/CNF aerogel adsorbent exhibited a high adsorption capacity of 298.5 mg·g-1 for Cr(Ⅵ)(318 K,pH=2.0).Meanwhile,the adsorption process can be fitted well with the pseudo-second-order model and the Freundlich model.Moreover,the Cr(Ⅵ)removal efficiency of the adsorbent remained above 85%after ten recycling experiments,indicating that PANI/CNF aerogel had excellent stability and reusability.Therefore,PANI/CNF aerogel showed a potential application in the treatment of chromium-containing wastewater.展开更多
基金Projects(2006AA06Z374, 2007AA021304) supported by the National High-Tech Research and Development Program of ChinaProject(2008SK2007) supported by the Key Program of Science and Technology of Hunan Province, China
文摘Sugarcane pulp residue （SPR）, a waste from sugar-refinery, which possesses a large surface area, can be used for removing chromium （Cr（Ⅲ） and Cr（Ⅵ）） from wastewater. In this work, the kinetics, isotherms of Cr（Ⅲ） and Cr（V[） adsorption and their removal by SPR were investigated. The results show that the removal percentages of Cr（Ⅵ） and Cr（Ⅲ） increase with increasing SPR dosage and temperature and decrease with increasing SPR particle size and the initial concentration of chromium ions. However, the influence of pH value on the Cr（Ⅵ） removal differs from that of the Cr（Ⅲ） removal. The Cr（Ⅵ） removal percentage decreases with increasing pH values, while the Cr（Ⅲ） removal percentage increases with increasing pH value. The adsorption kinetics of Cr（Ⅵ） and Cr（Ⅲ） well fits with pseudo-second-order model. Langmuir adsorption isotherm can well describe the adsorption phenomena of chromium ions with the maximum adsorption capacity of 0.567 mg/g for Cr（Ⅵ） and 3.446 mg/g for Cr（Ⅲ）. Moreover, SPR reveals higher adsorption capacity for Cr（Ⅲ） than that for Cr（Ⅵ）, which implies that SPR has more potential application for Cr（Ⅲ）-containing wastewater treatment than that for Cr（Ⅵ）-containing wastewater treatment.
基金National Natural Science Foundation of China(Nos.52073046,51873036,and 51673039)Fundamental Research Funds for the Central Universities,China(Nos.2232020D-08 and 2232019A3-01)+3 种基金Natural Science Foundation of Shanghai,China(No.19ZR1470900)Shanghai Shuguang Program,China(No.19SG28)International Joint Laboratory for Advanced Fiber and Low-Dimension Materials,China(No.18520750400)Initial Research Funds for Young Teachers of Donghua University,China(No.106-07-0053089)。
文摘Aerogel composed of polyaniline/cellulose nanofiber(PANI/CNF)was synthesized by a two-step method and used as an adsorbent to remove Cr(Ⅵ)from wastewater in this study.Adsorption results showed that PANI/CNF aerogel adsorbent exhibited a high adsorption capacity of 298.5 mg·g-1 for Cr(Ⅵ)(318 K,pH=2.0).Meanwhile,the adsorption process can be fitted well with the pseudo-second-order model and the Freundlich model.Moreover,the Cr(Ⅵ)removal efficiency of the adsorbent remained above 85%after ten recycling experiments,indicating that PANI/CNF aerogel had excellent stability and reusability.Therefore,PANI/CNF aerogel showed a potential application in the treatment of chromium-containing wastewater.
