以荔枝壳为原料,氢氧化钠为活化剂、微波加热,制备了荔枝壳活性炭.并以此活性炭为吸附剂吸附溶液中的Cr(Ⅵ),考察了初始Cr(Ⅵ)质量浓度、活性炭用量、pH、吸附时间、吸附温度对Cr(Ⅵ)的吸附量及去除率的影响.结果表明吸附Cr(Ⅵ)的最佳工艺条件为:荔枝壳活性炭质量1.6g/L、Cr(Ⅵ)初始质量浓度50 mg/L、pH =3、吸附θ为25℃、吸附t为240 min,在此工艺条件下,荔枝壳活性炭吸附剂对Cr(Ⅵ)具有良好的吸附能力,对Cr(Ⅵ)吸附量可达30.25 mg/g,Cr(Ⅵ)的去除率可达96.8％.吸附过程符合二级吸附动力学模型.热力学参数ΔG、ΔH、ΔS表明荔枝壳活性炭对Cr(Ⅵ)的吸附过程是自发、吸热过程.
参考文献
| [1] | Sud, D;Mahajan, G;Kaur, MP .Agricultural waste material as potential adsorbent for sequestering heavy metal ions from aqueous solutions - A review[J].Bioresource Technology,2008(14):6017-6027. |
| [2] | Gupta S;Babu B V .Removal of toxic metal Cr(Ⅵ) from aqueous solutions using sawdust as adsorbent:Equilibrium,kinetics and regeneration studies[J].Chemical Engineering Journal,2009,150(2-3):352-365. |
| [3] | Ayhan Demirbas .Heavy metal adsorption onto agro-based waste materials: A review[J].Journal of hazardous materials,2008(2/3):220-229. |
| [4] | Sandhya Babel;Tonni Agustiono Kurniawan .Low-cost adsorbents for heavy metals uptake from contaminated water: a review[J].Journal of hazardous materials,2003(1/3):219-243. |
| [5] | HU X J;Wang J S;Liu Y G et al.Adsorption of chromium (Ⅵ) by ethylenediamine-modified cross-linked magnetic chitosan resin:Isotherms,kinetics and thermodynamics[J].Journal of Hazardous Materials,2011,185(01):306-314. |
| [6] | Gupta, V.K.;Pathania, D.;Sharma, S.;Singh, P..Preparation of bio-based porous carbon by microwave assisted phosphoric acid activation and its use for adsorption of Cr(VI)[J].Journal of Colloid and Interface Science,2013:125-132. |
| [7] | Altun T;Pehlivan E .Removal of Cr (Ⅵ) from aqueous solutions by modified walnut shells[J].Food Chemistry,2012,132(02):693-700. |
| [8] | N. Daneshvar;D. Salari;S. Aber .Chromium adsorption and Cr(Ⅵ) reduction to trivalent chromium in aqueous solutions by soya cake[J].Journal of hazardous materials,2002(1):49-61. |
| [9] | Sun, X.-F.;Jing, Z.;Wang, H.;Li, Y. .Removal of low concentration Cr(VI) from aqueous solution by modified wheat straw[J].Journal of Applied Polymer Science,2013(3):1555-1562. |
| [10] | 陈艺敏,陈建福,黄慧珍,张玲.竹炭的吸附性能及应用研究进展[J].宁夏工程技术,2011(04):316-319. |
| [11] | Fan, Y.;Wang, B.;Yuan, S.;Wu, X.;Chen, J.;Wang, L. .Adsorptive removal of chloramphenicol from wastewater by NaOH modified bamboo charcoal.[J].Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies,2010(19):7661-7664. |
| [12] | Lothman Z A;Naushad M;Ali R .Kinetic,equilibrium isotherm and thermodynamic studies of Cr (Ⅵ) adsorption onto low-cost adsorbentdeveloped from peanut shell activated with phosphoric acid[J].Environmental Science and Pollution,2013,20(05):3351-3365. |
| [13] | Lakshmipathiraj P;Umamabeswari S;Raju G B et al.Studies on adsorption of Cr (Ⅵ) onto strychnos potatorum seed from aqueous solution[J].Environmental Progress & Sustainable Energy,2013,32(01):35-41. |
| [14] | Y. H. Li;C. W. Lee;B. K. Gullett .Importance of activated carbon's oxygen surface functional groups on elemental mercury adsorption[J].Fuel,2003(4):451-457. |
| [15] | Asada T;Ishihara S;Yamane T .Science of bamboo charcoal:Study on carbonizing temperature of bamboo charcoal and removal capability of harmful gases[J].Journal of Health Science,2002,48(06):473-479. |
| [16] | Zhonghua Hu;Lin Lei;Yijiu Li;Yaming Ni .Chromium adsorption on high-performance activated carbons from aqueous solution[J].Separation and Purification Technology,2003(1):13-18. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%