Department of Chemistry, University of Agriculture, Faisalabad 38040, Pakistan.
Department of Chemistry, University of Agriculture, Faisalabad 38040, Pakistan; Department of Chemistry, Lahore College for Women University, Lahore 54000, Pakistan.
Int J Biol Macromol. 2020 May 1;150:861-870. doi: 10.1016/j.ijbiomac.2020.02.093. Epub 2020 Feb 11.
Rapid industrialization is polluting the water resources and is becoming a serious environmental issue. In present study, the adsorption-desorption behavior of Direct Orange-26 (DO-26), Direct Red-31 (DR-31), Direct Blue-67 (DB-67) and Ever direct Orange-3GL (EDO-3) dyes on to native, modified rice husk (MRH), polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC) and alginate (ALG) immobilized biomasses were investigated under different experimental conditions. For adsorbent modification, physical and chemical treatments were performed. The results showed that HCl pre-treatment considerably increased the sorption capacity of dyes versus native biomass. The sorption data were optimized using pseudo 1st order, intra-particle diffusion, pseudo 2nd order and Elovich models. The results revealed that the two-step rate equation was followed for the desorption kinetics of dyes. The involvement of -OH (hydroxyl), -COOH (carboxylic) and -NH (amino) groups in the adsorption of dyes onto biomasses was shown by FTIR analysis. Studies exhibited that among adsorbents employed, the MRH has the excellent potential for the dyes degradation from textile effluents.
快速工业化正在污染水资源，成为一个严重的环境问题。在本研究中，研究了天然、改性稻壳（MRH）、聚乙烯醇（PVA）、羧甲基纤维素（CMC）和海藻酸钠（ALG）固定化生物量对直接橙 26（DO-26）、直接红 31（DR-31）、直接蓝 67（DB-67）和 EDO-3 等染料的吸附-解吸行为。在不同的实验条件下进行了吸附剂的改性，包括物理和化学处理。结果表明，HCl 预处理显著提高了染料对天然生物质的吸附容量。采用拟一级、内扩散、拟二级和 Elovich 模型对吸附数据进行了优化。结果表明，染料的解吸动力学遵循两步速率方程。FTIR 分析表明，-OH（羟基）、-COOH（羧基）和-NH（氨基）基团参与了染料在生物量上的吸附。研究表明，在所使用的吸附剂中，MRH 具有从纺织废水中降解染料的优异潜力。
