The biosorption of hexavalent chromium from aqueous solutions byOpuntiacladodes and ectodermis from cactus fruits was investigated. Both types of biomass are considered low-cost, natural, and ecofriendly biosorbents. Batch experiments were carried out to determine Cr(VI) biosorption capacity and the efficiency of the biosorption process under different pH, initial Cr(VI) concentration, and sorbent dosage. The biosorption of Cr(VI) byOpuntiabiomass was highly pH dependent, favoring higher metal uptake at low pH. The higher biosorption capacity was exhibited at pH 2. The optimal conditions were obtained at a sorbent dosage of 1 g L−1and initial metal concentration of 10 mg L−1. Biosorption kinetic data were properly fitted with the pseudo-second-order kinetic model. The rate constant, the initial biosorption rate, and the equilibrium biosorption capacity were determined. The experimental equilibrium data obtained were analyzed using two-parameter isotherm models (Langmuir, Freundlich, and Temkin). The Langmuir maximum monolayer biosorption capacity (qmax) was 18.5 mg g−1for cladodes and 16.4 mg g−1for ectodermis. The results suggest thatOpuntiabiomass could be considered a promising low-cost biosorbent for the ecofriendly removal of Cr(VI) from aqueous systems.
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机译：研究了来自仙人掌水果水溶液水溶液中六价铬的生物吸附。两种类型的生物量被认为是低成本，自然和生态友好的生物吸收剂。进行分批实验以确定Cr（VI）生物吸附能力和不同pH，初始Cr（VI）浓度和吸附剂剂量的生物吸附过程的效率。 Byopuntabiomass的Cr（VI）的生物吸附依赖于pH值，最有利于低pH的更高的金属摄取。在pH2下表现出较高的生物吸收能力。在10mg L-1的1g L-1和初始金属浓度的吸附剂剂量下获得最佳条件。生物吸附动力学数据与伪二阶动力学模型合适。测定速率常数，初始生物吸附率和平衡的生物吸附能力。使用双参数等温线（Langmuir，Freundlich和Temkin）分析所获得的实验性平衡数据。 Langmuir最大单层生物吸附能力（Qmax）为18.5mg g-1 for Cladodes和16.4mg g-1 for Ectodermis。结果表明，可以认为具有来自水性系统的Ecofriendly的Cr（VI）的有前途的低成本生物吸附剂。
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