Dad Fiza Pir, Khan Waqas-Ud-Din, Sharif Faiza, Nizami Abdul Sattar
Sustainable Development Study Centre, Government College University, Lahore, 54000, Pakistan.
Sustainable Development Study Centre, Government College University, Lahore, 54000, Pakistan; Department of Agriculture, Government College University, Lahore, 54000, Pakistan; Tasmanian Institute of Agriculture, University of Tasmania, Australia.
Environ Res. 2024 Jan 15;241:117702. doi: 10.1016/j.envres.2023.117702. Epub 2023 Nov 18.
Trace heavy metals such as copper and nickel, when exceeds a certain level, cause detrimental effects on the ecosystem. The current study examined the potential of organic compounds enriched rice husk biochar (OCEB's) to remove the trace heavy metals from an aqueous solution in four steps. In 1st step, biochar' physical and chemical properties were analyzed through scanning electron microscope (SEM) and Fourier transforms infrared spectroscopy (FTIR). In the 2nd step, two biochar vis-a-vis glycine, alanine enriched biochar (GBC, ABC) was selected based on their adsorption capacity of four different metals Cr, Cu, Ni and Pb (chromium, copper, nickel, and lead). These two adsorbents (GBC, ABC) were further used to evaluate the best interaction of biochar for metal immobilization based on varying concentrations and times. Langmuir isotherm model suggested that the adsorption of Ni and Cu on the adsorbent surface supported the monolayer sorption. The qmax value of GBC for Cu removal increased by 90% compared to SBC (Simple rice husk biochar). The interaction of Cu and Ni with GBC and ABC was chemical, and 10 different time intervals were studied using pseud first and second-order kinetics models. The current study has supported the pseudo second-order kinetic model, which exhibited that the sorption of Ni and Cu occurred due to the chemical processes. The % removal efficiency with GBC was enhanced by 21% and 30% for Cu and Ni, respectively compared to the SBC. It was also noticed that GBC was 21% more efficient for % removal efficiency than the CBC. The study's findings supported that organic compound enriched rice husk biochar (GBC and ABC) is better than SBC for immobilizing the trace heavy metals from an aqueous solution.
痕量重金属如铜和镍，当其超过一定水平时，会对生态系统造成有害影响。当前研究分四个步骤考察了富含有机化合物的稻壳生物炭（OCEB's）从水溶液中去除痕量重金属的潜力。第一步，通过扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）分析生物炭的物理和化学性质。第二步，基于四种不同金属铬、铜、镍和铅（铬、铜、镍和铅）的吸附能力，选择了两种生物炭，即甘氨酸、丙氨酸富集生物炭（GBC、ABC）。这两种吸附剂（GBC、ABC）进一步用于根据不同浓度和时间评估生物炭对金属固定的最佳相互作用。朗缪尔等温线模型表明，镍和铜在吸附剂表面的吸附支持单层吸附。与简单稻壳生物炭（SBC）相比，GBC去除铜的qmax值提高了90%。铜和镍与GBC和ABC的相互作用是化学性的，并使用伪一级和二级动力学模型研究了10个不同的时间间隔。当前研究支持伪二级动力学模型，该模型表明镍和铜的吸附是由于化学过程发生的。与SBC相比，GBC对铜和镍的去除效率分别提高了21%和30%。还注意到，GBC在去除效率方面比CBC高21%。该研究结果支持富含有机化合物的稻壳生物炭（GBC和ABC）在从水溶液中固定痕量重金属方面优于SBC。
