By Yogesh C. Sharma
Water toxins is subject of monstrous and customary problem through the international. This ebook provides the consequences and information from study and adsorption experiments conducted at the removing of nickel and chromium (as good as different metals) from aqueous ideas utilizing changed silica sand.
Chapter 1 creation (pages 1–38):
Chapter 2 fabric and strategies (pages 39–43):
Chapter three effects and Discussions (pages 45–90):
Chapter four Conclusions (pages 91–101):
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Extra resources for A Guide to the Economic Removal of Metals from Aqueous Solutions
70]. The parameters studied were: initial concentration, amount of adsorbent, and pH value of solution. The maximum percent metal removal was attained after about 1 h. The greatest increase in the rate of adsorption of metal ions on sawdust was observed for pH changes from 2-5. High removal has been recorded at low surface loading. O. A study was conducted by Li et al. 75 mm crushed shells and Sphagnum peat moss as low-cost natural adsorbent filter materials for the removal of nickel ions from binary aqueous solutions.
The H-class of isotherm has a positive value on the adsorbent surface reflecting the high affinity for solute onto part of the adsorbent surface, and consequently the depletion of solute concentration in the bulk phase. The C-class of isotherm indicates a constant partition of solute between solution and adsorbate. In some instances, after a critical concentration, the curve may show an abrupt change suggesting that sites are becoming available for adsorption. Several types of isothermal adsorption relations are reported.
2 Adsorbent Modification Silica sand was modified by soaking in 40% H2S04 for a period of 4 hrs, and after that the treated sample of silica sand was washed repeatedly with deionized water. Simultaneously, the pH of the supernatant water for washing was checked, and the washing of treated silica sand was done until the pH of the supernatant water reached a neutral pH range. 1 Raw silica sand used in the experiments. the treated sample of silica sand was dried in an oven until completely dry. 3 Preparation of Adsorbate Cr (VI) and Ni (II) Solution A stock Cr (VI) solution of 1000 mg/L was prepared from potassium dichromate salt (K2Cr207).