(1. 吉首大學(xué) 生物資源與環(huán)境科學(xué)學(xué)院，吉首 416000；
2. “錳鋅釩產(chǎn)業(yè)技術(shù)”湖南省2011協(xié)同創(chuàng)新中心，吉首 416000)
摘 要: 以檳榔渣(Waste areca，WA)為原料在氬氣氣氛中于450 ℃碳化45 min制備檳榔渣燒結(jié)碳(ACWA)，采用X射線衍射、掃描電鏡、碘吸附值測定、比表面測定等對其性能進(jìn)行表征。結(jié)果表明，制備的燒結(jié)碳為多孔的碳材料，平均孔徑為4.25 nm，比表面積和碘吸附值分別達(dá)到742.53 g/m2和1241.82 mg/g。以ACWA為吸附劑，對廢水中Mn(Ⅱ)的吸附進(jìn)行研究，考察ACWA用量、溶液pH值和共存離子 (Na+、NH4+、Mg2+、Ca2+和Al3+)等因素對吸附效果的影響，并對吸附等溫線和吸附動力學(xué)進(jìn)行研究。結(jié)果表明：ACWA對Mn(Ⅱ)具有良好的吸附作用，對濃度為180 mg/L的Mn(Ⅱ)廢水在60 min內(nèi)可實(shí)現(xiàn)最大吸附容量34.28 mg/g，Mn(Ⅱ)吸附率高達(dá)95.2%。熱力學(xué)和動力學(xué)研究表明，ACWA對Mn(Ⅱ)可用Langmuir吸附等溫方程來描述，而吸附動力學(xué)符合準(zhǔn)二級動力學(xué)模型。機(jī)理研究表明，由于表面具有豐富的負(fù)電性官能團(tuán)，ACWA主要通過化學(xué)絡(luò)合和靜電吸附作用而實(shí)現(xiàn)對廢水中Mn(Ⅱ)的高效去除。
關(guān)鍵字: 檳榔渣；錳離子；吸附性能；廢水處理
（1. College of Biology and Environmental Sciences, Jishou University, Jishou 416000, China;
2. The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology, The 2011 Plan of Hunan Province, Jishou 416000, China）
Abstract:Activated carbon materials derived from waste areca (ACWA) were prepared by calcinating the waste areca(WA) at 450 ℃ for 45 min under argon atmosphere and characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), iodine adsorption value and specific surface area measurements. The adsorption performance of ACWA on Mn(Ⅱ) was investigated by analyzing the effects of dosage of ACWA, solution pH and coexisting cations (Na+, NH4+, Mg2+, Ca2+ and Al3+) in combination with the study of dynamic and thermodynamic characteristics. The results show that the prepared ACWA is a mesoporous carbon material with average pore diameter of 4.25 nm, specific surface area of 742.53 g/m2 and iodine adsorption value of 1241.82 mg/g. ACWA is an excellent adsorbent for Mn(Ⅱ) and the maximum adsorption capacity of 34.28 mg/g and adsorption rate of 95.2% can be obtained for waste water with 180 mg/L Mn(Ⅱ) in 60min. The Langmuir model fits well to the equilibrium data and the kinetics of the adsorption are well described by the pseudo-second order model. Adsorption mechanism analysis indicate that the efficient removal of Mn(Ⅱ) by ACWA is achieved by means of chemical complexion and/or electrostatic adsorption between electropositive Mn(Ⅱ) and electronegative functional groups on the surface of ACWA.
Key words: waste areca; Mn(Ⅱ); adsorption performance; wastewater treatment
